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Piezo analogue sound

Hi all. I am a newbie and this is my first post so i might be barking up the wrong tree here. Would it be possible to use one of those small piezo-ceramic speakers to play sound e.g. from an mp3 player headphone jack? i am not looking for great quality sound, only voice quality, but i needs to be fairly loud. Many Thanks, Bob

Topic by saiorse44    |  last reply

analogue-digital cmos chips? Answered

Is there a chip like the LM3914 that takes an analogue voltage input and turns it into a digital signal? (preferably BCD, but decimal is fine too), but without the inverting output, so I can use it with other CMOS chips? I basically just want a chip that takes an analogue signal, and based on a threshold, divides it up into a decimal (or binary) signal. Specifically, I want to use it with a thermistor and a 7-segment display to make a digital thermometer.

Question by andy70707    |  last reply

analogue destructive interference device?

I was hoping to learn how to make a machine that would allow me to put it down, push a  button and no longer hear beyond it.  it would be ideal for doing interviews at conventions.  I was also hoping to  have it made so theres no computers involved, just older electronics, so it would, in theory use less power.

Question by ketrovin    |  last reply

Analogue Gauge Readout For PC Audio Answered

How can I use 2 of the "Cracker Box Amp" circuits to drive standard analogue gauges from the audio out on my computer.  I will use 2 gauges, one for left channel and one for right. I want the gauge to show the amplitude. If I just wire up a gauge to a channel on the audio out then the needle will simply move as if it were a speaker. As I said before, I want the gauge to show the amplitude.

Question by physics_dude    |  last reply

full deflection of analogue multimeter needle? Answered

Hi, I accidently kept the dial at 25ma, instead of 250v ac of my analogue multimeter, the needle jumped twice, i realised my mistake and immediately disconnected, the problem now is when ever i check any reading including ohms check, the needle deflects fully, any idea what  i must have damaged. Hi, I just added the front and back of the PCB, if u gentlemen could identify, the shunt resistor and the current limiting resistor, will be of great hep

Question by patrickvaz    |  last reply

Wiring analogue VU meters to headphones

I'm trying to wire two VU meters to some headphones so that there is a meter for each channel(one for the right, and one for the left). How would I hook them up? Do I need any special circuitry so that they work correctly? Attached are the meters I have still attached to the board I've salvaged them with.

Topic by Ora    |  last reply

Need help with PWM to Analogue conversion

I have a Futaba RC transmitter and receiver, and an electric wheelchair. I want to be able to control the wheelchair via RC (a-la battlebots), and I do not want to control the joystick via servo. I also want to leave the wheelchair's joystick controls intact and either solder another RC device in tandem with the joystick, or hijack the control by having an external switch that switches from either manual joystick, or RC Freq. I have some experience in electronics, but only in the troubleshooting arena. I can fix things if they are broken and can troubleshoot to the board level, but have no experience building bots and have no RC experience. The solution needs to be low cost please. I can solder build boards from directions. I just have no "vision" of how to put these 2 systems together. I think the words "pwm to analog" have been thrown around online, but I need to know more. Please point me to websites, or send me instructions and Ideas. The wheelchair will not be a wheelchair forever. R2-D2, Wall-E, and an RC Lawnmower are all in contention. Thanks in advance.?

Question by CementTruck    |  last reply

A circuit for randomly lighting LED?

Hi all I am a newbie in analogue and I would like to make something for hobby. I would like to build a circuit with breathing lighting effect for 5 to 6 LED, and they breath individually at random time, so to create some random lighting effect, and the circuit may be powered up by a 3V battery. So how can this individual random time for switching the LED on and off done please?

Question by luckyvictor    |  last reply

cmoy feedback "synth"

This isn't a question, just an interesting discovery that I didn't think warranted an entire instructable Decided to convert my old cmoy amp into a portable speaker, so I found some little drivers and soldered them to the pins of the output jack, tested it, worked fine, then I got bored and decided to connect the input jack to the output jack with an aux cable:

Topic by erenjay    |  last reply

Take Part In The Analogue, Digital and You Questionnaire

Hi there friend! Lomography wants to know about the role analogue and digital have in your life and how you feel about the dominance of digital technology. Is this trend positive or a necessary evil in this day and age? What do you think? Digital technology is undoubtedly a core part of our daily lives. How comfortable are you about being constantly within reach? Do you feel naked if you leave the house without your phone? Or do you love the freedom being without technology brings? We’d love to know Do shooting on film and and other analogue activities help you keep a healthy balance between being online and offline? We would really appreciate it if you could take a few minutes to fill in the questionnaire and share your thoughts. Also, please remember to hit ‘Submit’ at the end of the questionnaire otherwise your answers will not be registered. Thank you in advance for taking the time to do this. Answer the Questionnaire Thanks!

Topic by ilkadj    |  last reply

Garbled question about, 'Getting used to sound'. Answered

I almost didn't post this because it seems so stupid but .... A guy who has just started at working with me said that he was thinking of getting a valve amp for his music system. The reason being that he had been told by a BBC sound engineer that, ' The trouble with digital sound is that you get used to the volume.' He then went on to explain that he used to listen to his music at  -50dB but he's noticed that he now prefers -70dB. He was using the phrase, ' digital sound', so I don't know if he's comparing valve amps to solid state or what ?,  and I don't know if he knows; But whatever he means by, 'digital sound', he is comparing it to and believes it can be bettered by a valve amp. I said that I didn't believe in this getting, 'getting used to the sound', phenomenon but that I would ask someone who did  ...  one of you. So, sorry for this garbled ill informed question, but if you can make any sense of it please answer so that I've got something to talk about when I next see him. Thank you.

Question by FriendOfHumanity    |  last reply

Is it possible to change the FSD of an analogue panel meter? Answered

I have a 1940s panel meter from an old radio but it only has a FSD of 1.5mA. I am intending to use it as an ammeter so I don't think it's possible to put a resistor in series. Any help would be greatly appreciated.

Question by oliverrichard47    |  last reply

Using headphones for listening to tv.?

My panasonic tv does not have bluetooth. I have new Marley headphones. Theywork well but not when the channel says Dolby or no good with Netflix as they appear to all transmit in Dolby. I purchased both a digital to analogue converter and bluetooth transmitter as advised but still cannot get Netflix audio or those channels using Dolby. Is it because bluetooth will not transmit analogue??

Question by BarryN16    |  last reply

Lomography Konstructor - World's First 35mm DIY SLR

Analogue photographers rejoice! Today, Lomography is proud to announce the world's first 35mm do-it-yourself SLR camera, the Konstructor. Demystify the inner workings of a SLR camera by building the Konstructor yourself. Assembly takes about an hour, and can be customized with fun stickers after to personalize your new camera. Not just a simple kit, the Konstructor boasts different shooting modes, a tripod, and an uncoupled shutter release to easily produce multiple exposures. The Konstruktor produces wonderfully sharp and vibrant photos which capture the joyful essence of photography. "Through the fantastically fun process of assembling this beautiful machine, you’ll learn the essence of photography and be able to shoot wonderfully sharp and vibrant analogue photos. It’s time to take the next step on your exciting photographic adventure and boost your creativity to the max." TECHNICAL SPECIFICATIONS 35mm (135) Film Detachable 50mm f/10 Lens Shutter Speed: 1/80s with multiple exposures Focus Distance: 0.5m – Infinity Dimensions: 121 × 33 × 65mm Ready to get your own and start building? Head over to Lomography!

Topic by lomography    |  last reply

Old analogue TV with set top box problems

Hello everyone. This is the first time I have asked a question on Instructables, so please bare with me. Ok, so I have an old tv (one with only a RF coaxial input port) and a set top box. At the moment, I have the cable from the antenna plugged into the back of the set top box, then I have the component cables from the set top box plugged into the back of an old VCR player which has an RF coaxial output which goes to the TV itself. Now, this is all fine and dandy, the picture quaulity is good and it all worked forst go, the problem I am having is the sound. The sound is really very quiet which doesn't matter too much as the TV is pretty close to where I sit, but there is a static fuzzy sound that sort of drowns out the sound I am hearing. So I am thinking that the VCR player is causing this interference and quiet sound, would I be right? Is there some sort of adapter I can get that converts a component input into a coaxial RF output so I can bypass the VCR player? Any other tips/Ideas? Thankyou very much.

Topic by youkneephsycle    |  last reply

how do i connect a shunt to an analogue ammeter?

How do i connect a shunt to an analogue ammeter? can some please draw me up a diagram (even crude paint one will do ) of how i wire up an ammeter to a device such as a motor or something with one input and one output (+ and -) while using a shunt? shunts really have me confused and i havent yet been able to figure out how they work logically

Question by oldmanbeefjerky    |  last reply

in addition to my RFID chess board Q, i'd also like to know if anyone has a source for LCD clock faces.?

Thing is, i'm an old school blitz player and i know a lot of others are as well. digital chess clocks are cool, but there is something cold about a seven segment display. also the chronos clocks are super expensive. we like the look and feel of analogue clocks, but like the accuracy of digital. i mean the ultimate for me would be to have a clock with a stepper motor and control it directly, but that's out of my realm right now. what i'm looking for is a lcd clock face that has the look of an analogue clock. like the image included. this way i could have the best of both worlds, a countdown timer with an analogue face. plus it would make for a great kit.

Question by fusion    |  last reply

DIY Palette Gear - Possible

I have been looking at the old Kickstarter campaign for the I have been looking for possibilities to create one myself for much less of the money's :) . I already have many anologue switches and buttons and stuff. The issue is making them talk to premier pro, ext. Could you hack their software to work with your own hardware or something. Another simular company has made this Ideas?

Topic by Mutant Tortoise  

How to transmit video from Raspberry Pi to an analogue television set.

Hi, I am working on a project that transmits video from the Raspberry Pi to an analogue television set. I am wanting it to use no USB transmitters or any other USB dongles (just a single wire from a GPIO pin). I have looked around on the internet on how analogue tv sets work and what they receive, apparently the video is transmitted on the AM band, and the audio is transmitted on the FM band. If anyone has any information on how to do this or knows about an article on this subject(or even know if this is possible:) ) please let me know. Thanks

Question by Jacoby Yarrow    |  last reply

How can I modify a basic mains timer switch (non-digital) to work with DC?

DC timers are extremely costly compared to their AC counterparts and can be very complex. I'd essentially like to modify one of these guys to work with DC, plugged in a circuit, instead of the wall outlet. Here's an example of the timer switch stuff I'm referring to: So... how can I do it? I'd like ot to accept a wide range of input voltage (12v to 32 but 20 to 32 would also work if it makes it easier) Thank you guys!

Question by atkers    |  last reply

Find the average and highest voltage from multiple photodiodes before analogue Arduino input? Answered

Hi, I have a large number of photodiodes (too many to connect all of them individually to the analogue inputs on my Arduino) so I was hoping I could form say 4 groups each containing several parallel photodiodes and find the average the highest voltage for each group. This way each group uses 2 analogue inputs. The picture below depicts one group of photodiodes connected to two 'black boxes'. The 'highest voltage' black box would determine which input had the highest voltage and would then output that voltage to the Arduino. The 'average voltage' black box would average the input voltages and output this voltage to the Arduino. I have found a passive averager circuit on this website - - which appears to be suitable however I have no idea how to find and output the highest voltage. Hopefully this sufficiently explains what I'm looking to do and I look forward to getting feedback. Andrew

Question by Andycb93    |  last reply

CLOCKS!!! how to make a.... very powerful clock?

Hey, I'm new on here but realllyyy need some help in this as I have a limited technological background. Basically I have a project in which have two digital displays, each one displaying either the time, in minutes or the hour (two digits per display). Now what I want to do with these is effectively attach these on to the hands of an analogue clock, so that when the hands spin round, the time is displayed. For example when the minutes hand is at the quarter past mark, the display will read 15 and when the hour hand is at the bottom the other display will read 06. So I have the designs ready for this clock (including counterweights and whatnot) but I just need a very powerful clock movement, or gearing system that will enable me to turn a couple of heavy clock hands, I have seen online you can but high torque movements which at the moment is my best bet, but i cant imagine it will work very well to be honest. I would really appreciate any response or something to point in the right direction as I'm very open minded and if the issue is solved, I will be sure to put up instructions on how this clock was made. Thanks for reading. Josh

Question by joshblee23    |  last reply

Advice on microcontroller selection

Hello I am a newbie to the world of microcontrollers and would be really grateful for some advice about choosing one. Basically, I’m doing a final year university engineering project that requires an MCU to take a number of analogue inputs, do some processing, and spit out an analogue output that will drive a loudspeaker. My supervisor has recommended looking at the Philips LPC2148 and associated development kits ( because it is cheap and looks able to fulfil the following requirements: I/O – three analogue inputs (so 3 ADCs), 3 digital inputs (two servos and a bus for programming the controller), and one analogue output (requiring a DAC either built into the development board, or one I could connect on an add-on board) Speed – a program size of about 500 floating pt operations, processing samples at a rate of up to 400/second, hence of the order 200,000 floating pt operations per second. I think the LPC2148 uses fixed pt arithmetic so would need to perform the equivalent of this in fixed pt. Support – in place debugging support would be desirable; ability to be run on Windows; overall hardware and software cost of £100 or less. Does this chip and its development tools look up to the job? If not, would you recommend an alternative? Are there any other major criteria I’m neglecting in the process of selecting a MCU? Many thanks, Sam

Topic by samtheengineer    |  last reply

how to detect sensor position with arduino uno

Hi Guys recently i started use arduino UNO and with simple programs to read from analogue pins wasn't hard. now i'm facing a challenge, as i have a sensor mat 16x16 (rows and columns) i want to read 4 rows and 4 columns i'm trying to use the analogue pins as input for rows and digital pins from (8 to 11) as output i want the program to detect the position of the sensing area such as (row1 colum 4, for example) and give me the number that measured over this area. my code is very bad but i'm trying, specially my background wasn't programming or science. any ideas will be great.

Topic by Najeebgh    |  last reply

pls read details

I want a bulb/led to light up with an intensity dependent upon the amount of light that hits the analogue light i really need arduino or any programming? , or can i just connect the battery ,the light sensor and the bulb in a simple circuit??

Question by adivinorum    |  last reply

Favorite Post-Rock Bands?

Mine are: Explosions in the Sky, God is an Astronaut, Mogwai, Sigur Ros, Mono, Valley of the Giants, Caspian. Currently exploring an indie post-rock group from Greece, No Clear Mind. They have pretty good stuff on YouTube. Share post-rock bands that you know, I might like them too. :)

Topic by Analogue-Chick    |  last reply

Arduino Pins

Hi, I am wondering if someone can explain these to me..  My main problem is that I have no idea the difference between the Digital and the Analogue pins.. I know both these types can be used for Input and Output purposes, so what makes them different?. Also, why are there Ground pins?.. I have read that you should use them, but I don't understand why and when to use them.. Appreciate any help.. Thanks.

Topic by millie8508    |  last reply

Optical fibre cable DAC chip??

Hey everyone,I'm trying to take an audio signal from an optical fibre cable pass it through a DAC0800LCN IC, 8BIT DAC chip and input into the Arduino. I'm trying to use a 3 pin fiber optica toslink transmitter to connect the fibre optical cable to the DAC chip. Does anyone know how to set this up or even if this would work? If anyone could answer this is would be much appreciated.

Question by MCsugar43  

How many people still use a darkroom?

I've been posting a lot of instructables on how to do certain photography techniques and tips, but they're all related to digital photography.  Is there anyone who's interested in analogue photography and darkroom proccesses?  I'm trying to get back into developing my own film and such, and I figure why not do a few instructables as I go.  I'm just curious to see if anyone would actually be interested in that.  Here's one I've already published, so let me know.

Topic by KathyTackettPhoto    |  last reply

Mystery Contraction ? Answered

Hi all,  I found this contraption today at the tip and was wondering if anyone knew what it might be?  It has been hand-made and looks like it measures something but I can't work out what.  It has a micro amperage meter, an LED, a bunch of coils which look like they are from a heater, and also a analogue clock on top with no hands.  Oh and it also has some small glass tubes on top which look like micro movement switches. I thought it might be used to measure lightening or some other environmental effect.  Maybe earthquakes? any ideas?

Question by lonesoulsurfer    |  last reply

Help with LED's

Hi everyone - this is my first post so bear with me i'm looking to create my own instructable in the form of a clock but need a little help. I want to create an LED backlit analogue clock (so just the face lights up) but i want it so that the backlight only comes on between certain times (essentially during the hours of darkness) with the ability to change the times the light comes on and goes off. I'm pretty new to electronics so don't really know where to start with this one but if anyone could give me any tips / pointers on how this could be done i'd be most grateful cheers in advance :o)

Topic by ochoellis    |  last reply

I'm looking for a simple way to control servos, with minimal electronics, and no programming, am i hoping for a miracle?

I'd like to be able to control a few different servos for a project i am considering, but I'm not too hot on electronics (i can solder, but i don't understand the principles of how it all works) and i don't know any programming. is there a way to control them in a direct way, i.e. push a button, turn 90 degrees? I'd also like to have more analogue control if at all possible. can anyone point me to an instructable? or help me understand what i need to do?

Question by cyc4015    |  last reply

Radio Mod?

I would like to mod a handheld radio (or even a analogue tv but radio would be better) to get to listen to higher frequencies than normally available. I'd Like to hit the 1420Mhz mark approximately but with little electrical engineering or architecture experience, I'm not certain how? Which might make a TV easier to get there as UHF covers that right? (still safer to play with a battery powered radio than a 240V powered one) I figured there is someone out there with the ability to figure out what components need changing? The variable resistor that tunes it perhaps? If you'd rather post an instructable I'll follow that or just tell me what needs replacing with what? Any Ideas?? Thanks

Question by Mr E Man    |  last reply

Telephone answering machine

I am looking for a machine that will allow people to call a telephone   number that would be automatically answered and relayed to a   louspeaker so that the call can be heard "out loud". This planned as   an analogue system but I am open to everything. The calls should be   limited to 3 minutes. alternative:   an app that would allow me to answer my calls   automatically (hands-off) and listen to the callers without touching   the phone. The calls should be limited to 3 minutes. This is project that is happening in mid-August 2013 in Palm Springs Ca. Usually in Europe I use a  Tiptel 540 SD  but these dont seem   available in the US. Any tips or help are welcome. see web link Yours electronically B. Maubrey

Topic by Feedback Fred    |  last reply

Picaxe 28x2 BCD to Decimal conversion? Answered

Hi, Bit of a daft question really. I am trying to output my clock data from my Pic' 28X2 to a custom array of LED's. I have the code that reads my clock (RTC DS1307) and coverts the BCD input to decimal but no matter what I can't seem to find out how to output the decimal data or have the picaxe arrange it in such a way that it will be displayed on my LED array. My array is, put simply, an LED version of an analogue clock with 60 LEDs for the seconds, minutes etc.  If I could have some pointers with regard to either decimal output or BCD output to a dedicated BCD to DEC chip, that would be much appreciated. Thanks

Question by LED Maestro    |  last reply

do ammeters that have an independent power supply require a specific voltage to work?

Hello, for a DIY project i plan on taking on soon, i need to measure amperage, and i have been looking for a digital ammeter, as the analogue one shave been to bulky to use. i need to know, if this ammeter will be able to read amperage at 3v-5v;=120686900155&ssPageName;=ADME:X:eRTM:AU:1123 it says it needs 6v -15v input, but this is just to power it, and isnt what is being measured. i need to know, do ammeters need a current with perticular voltage to properly measure the amperage? ive seen others that operate on 0-30vdc, and others that must have 12v or 24v, and the rest dont say at all how they work.

Question by oldmanbeefjerky    |  last reply

Solar charging a battery with Arduino?

I am making a solar rover robot using an arduino duemilanove. I have a 12 volt solar panel and a 9.6 volt nicad battery. I am wondering if this circuit I sketched would allow me to prevent the battery from over charging. The battery is monitored by dividing the voltage and connecting it to analogue input on the arduino. When the battery is fully charged, the arduino sets an output pin HIGH and breaks the connection between the panel and the battery using a PNP transistor. Does the transistor subtract current from the circuit? In the open state will there be more than 9.6 volts entering the battery? here are some links to the robot so far! (without solar installed) Pics! http:// Video!

Question by Revolt Lab  

An awesome title

My skills include: Making small circuits, photography, computers What I'd like to make for someone: Anything I'd be willing to make this size gift package for someone (choose all that apply): (S,M,L) Small and Medium I'd be willing to receive a smaller or larger size gift package from someone than the one I make for someone else: Sure What I like: I like computers, photography, robots, electronics, movies What I don't like: reality tv, pink, analogue I absolutely can't have: (due to allergies, pets, etc) N/A Type of thing I'd love to receive: Really anything Would you be willing to ship to an address outside your own country? I would prefer not to, but I am not against it. Confirm that are at least 18 years old or, if not, that you have the approval of a parent or guardian: Confirmed

Topic by whosdadog  

Squid Labs spin-out company hiring - Electrical Engineer

One of the Squid Labs spin-out companies is hiring! Come work with us in the control tower!The technology that this spin-out is developing is not yet public, so in the job description below, it is simply referred to as "Squid Labs." The job will require full-time attention to the spin-out, and so while you will technically be at Squid Labs, the job is not with Squid Labs. Hopefully, I've made that perfectly muddy. If you can understand that (and make it clear that you understand it in your cover letter!) and have the required qualifications, you're probably a good fit. Electrical EngineerSquid Labs is a rapidly growing Bay Area start-up that aims to revolutionizerenewable energy generation. Squid Labs is engaged in a research anddevelopment effort to produce novel systems for both centralized anddistributed energy generation systems. Squid Labs is seeking a talented andmotivated power electronics engineer. The ideal candidate will haveextensive experience with motor controller development (AC induction andPM, three phase brushless motors) and the associated power electronicssystems combined with an inventive resourcefulness to quickly executeprototype solutions in the field. Further, this candidate would be familiarwith the startup environment and the associated hours, deadlines and high-energy culture that go with launching innovative new products.The Power Electronics Engineer will be responsible for:- Self-directed research and cooperating with an interdisciplinary team- Rapidly developing and building solutions to complex high powerproblems- Development of analytical models to make decisions on specific andglobal aspects of system architectureThe candidate should have the following qualifications:- PhD or equivalent in Electrical Engineering- 5+ years of experience in analogue/digital/power electronics o standalone and grid-connected power electronics o motor control for motion and generation o single-board computer development for control o digital/analogue signal conditioning o sensor and actuator development and integration- Experience with data analysis and model verification- Understanding of control theory for SISO and MIMO systems- Appreciation for the natural environment and a strong desire to workon renewable energy technologyPlease send resumes to

Topic by ewilhelm    |  last reply

741 Signal amplifier Answered

How would I go about creating an amplifier using an LM741 to amplify a 0mv-400mv signal to a 0v-4v signal? All the circuits from google or textbooks don't work, or produce strange oscillations. The only way I can get it to work is in inverting mode, where I can get -4v-0v out, which isn't very useful. My specific application for this is for a digital thermometer. I intend to amplify the 0-400mv analogue signal from an LM35 linear temperature sensor, then somehow sample that without using loads of logic or transistors and convert it to decimal or binary, then drive a dual 7-segment display to show the temperature. I have a prototype made using 20 comparators and 10 xor gates, and countless diodes, so if anyone could advise me on an easier way to do that, that would be great. And no PICs/AVRs, I know how to use them and have programmers, but I prefer to do "real" electronics using CMOS chips.

Question by andy70707    |  last reply

How to give analog input from 3.5 mm jack to FPGA (Spartan 3e)?

I am working on a voice transmission project by using Spartan 3e. My code works just fine. My problem is that i give analogue input to adc side by using a potentiometer and see the changes (as digital) on leds ( digital output is assigned to leds). Here is the problem, i cut a headphone into two and connected 3.5mm jack side to my phone to play music. There are 3 cable which are golden, blue and red. Golden one is connected to "GND" pin , Red one goes to "Va" pin (at adc input). i didnt touch the blue one. When i play music, i see no change on leds despite the fact that i did see by using potentiometer. What am i missing ? Do i have to setup an external circuit before giving the analog signal to Va input ? Thanks in advance.

Question by CuriousPuppy    |  last reply

Maker Movement Gaining Recognition

Tim O'Reilly has some really nice things to say about Instructables and our community of people building things and doing it themselves over on the O'Reilly Radar post Maker Movement Gaining Recognition.In addition, what today is "do it yourself" is tomorrow's big business. The hacker building homebrew robots shows us something about the future of robotics. The crafter incorporating technology into traditional crafts shows us something about how computing is becoming pervasive. The folks playing with laser cutters and 3D printers are telling us something about the future of manufacturing. The folks hooking up sensors to tie physical buildings to their analogues in Second Life are telling us that the future may not be in virtual reality but a new kind of augmented reality.For a long time, Tim has had success identifying trends by looking to hackers to see what they're up to and how the problems they're solving will soon become mainstream. So, what problems are you working on right now? What's you're next Instructable that's poised to go mainstream?(The image is from our July Show and Tell.)

Topic by ewilhelm  

Take a Black and White Photo, Get a patch!

 Hello again. It's time for another photo contest! This month the theme is a nice broad one, just to get things going after the first one last month. Black and White This months theme is Black and White. Try and focus on those distinctive shapes and defined shadows that make black and white photos pop. Get into the mindset of what will look good when in black and white. A good contrast is normally a good basis for a black and white photo. Any black and white photo is allowed, digital or analogue. Nearly all modern digital cameras have a black and white mode. The one stipulation is that you have to go and take a new photo! Not just upload an old photo. The idea is to encourage you to take some new pics, opposed to showing off what we have done before. Attached are a couple of shots I took today! Every black and white photo uploaded gets a Patch! If I missed giving you a patch last month, let me know in your comment, and I will send you one of each to make up.

Topic by gmjhowe    |  last reply

question about hard drives and LED lights?

Hi guys, I'm trying to do this --> for a little jukebox/media centre I'm building. I have a basic VU meter all ready, and also a potentiometer. I've just pulled apart an external hard drive and I'm hoping to tap into the 'activity light' on the front to drive a simple VU meter.  It's a basic Western Digital external 1TB, but it has two little LEDs that flicker blue (alternately, but sometimes together!  Not sure what drives each light?!) and I'm just wondering what my next step is.  There's the basic hard drive, and a little SATA->USB controller board attached that features the two LEDs. I've attached a pic, sorry it's not great.  The Two LEDs are shining out from underneath the card, and you can see a little row of soldered connections on the topside of the board that run the LEDs, at the closest corner to us (the viewer). My question is: there appear to be 4 soldered connections on the two LEDs poking up.  What do I want to solder the VU meter to, and what are the risks to avoid?  Any comments/thoughts are welcome.  Thanks  :-)

Topic by zfh10    |  last reply

How can I read accurate analog values on Arduino A2D? Answered

I am running an 8x8 screen from the 5v supply on board an arduino (controlled by the arduino via shift reg's). I am also trying to read an analog value over one of the analog pins. I have noticed however large variations in the analog read value, enough to make it near useless. I get the same problem to a lesser extent without the screen on but still rendering it next to useless. Normal resistors seem to be absolutely fine giving a near constant value, but using photo-transistors produces the error, as does reverse bias LEDs. Any Idea's whats going on or how it may be fixed? p.s. When the screen is on the interference is cyclic, looks like a relatively steady (frequency) sine wave. The rate of the interferences wave seems to vary with how long the display sequence is (basically its display, read, display, read loop). When doing a read I have tried with the screen both on and when the shift regs Output En is low (effectively off) - still getting the cyclic interference. Interference when all that I am doing is analogue reading appears random.

Question by andy    |  last reply

555 monostable timer

I've no idea what I'm talking about here but can only explain what im looking for which is help. I'm basically looking for a relay or multifunction relay not really sure but here's the plan. When my smart plug is turned on (at certain programmed times through the smart plug app) to provide power to a 12v 6amp pump (I have 240v ac to 12v DC transformer pluged into smart plug I'm in uk) I would like for this pump to turn itself back off after 10 or 15 seconds. I cannot for the life of me find an analogue or digital timer that can do seconds. The smart plug can work down to minutes and not seconds. So basically smart plug on = pump run for 15 seconds cuts itself off and then the smart plug turns off once the minute is up and when plug is on again at next programmed interval it does same thing. Any help would be great as I've no idea what I can buy or try to make thanks When trying to research I hear about 555 monostable circuit but I don't know how to wire something up or what to buy to make this work.

Topic by croyf85    |  last reply

Computer from dump */Update/*

I recently found this beauty in the town dump. It just sat there begging my name so i took it home.After i got it home i popped it open and looked at it and realized a DVD-RW drive was missing as was an 80 gig hdd and all the RAM. i am no expert and am wondering if this is worthy of buying the Ram (if so where and what price what type?) or if i should scrap it for the components or sell the video card and such on ebay? Your opinions on the possibility of it working and anything else are greatly appreciated. The images below should help with judgment. */Update/* I just tried starting it up. No louck i triead a moniter with digital input and one with analogue input both came up blank. then i tried both without the drive connected (earlier the drive just spun continuesly) and still no luck the onlly things that showed it was alive is when the keyboard flashed its lights for a second when the computer was starting up (the Num lock, caps lock, and scroll lock), the fact that when connected the drive spun furiously and that the power light on the front turned on. I'm at the point of considering whether to scrap it and sell the components and use the various bnits and pieces for expierments and the likes or to continue to try to coax it to life.

Topic by lemonshark10    |  last reply

Do crystal radio's work when 'digital radio' has taken over?

For the past couple of days I have been interested and reading about crytsal radios. Having many issues recently, I do know that our radio stations here in Australia went to 'digital' and they removed analog T.V, but I never heard anything about radio. I can still pick up AM radio stations on the radio or in the car, but are these signals sent differently that a crystal cannot pick up? I attempted 2 versions of a foxhole radio, no luck at all there. So I went to Jaycar and bought this: This proper PCB, with a galena diode still does not work. It also doesnt use a ground. Unless my aerial needs to be bigger which I doubt! I am using a 30ft spreader aerial. Later today I will stand NEXT to a radio station building which is only 2km from here, if it does not work, then no crytal radio works over here anymore which would really suck! How could they remove it!? And if I am wrong about the crystal stuff, then im still mad that the analogue technology has been removed anyway. It should sit there for anyone to explore.

Question by AtomRat    |  last reply

Large electrolytic cost/size "sweet spot"?

I'm in the process of sourcing components to build a capacitive discharge battery tab welder - there are a few designs out there on the internet from this one: which I like because it's nice and simple, to this one, which is gorgeous but complicated. So anyway, first off I want to find some large capacitors. I'm wary of using car audio stiffening capacitors as it looks like they don't last very long for this purpose, although they can be obtained relatively cheaply, and I can't afford large standard type electrolytics which cost an arm and a leg. I did have the idea that there must be a "sweet spot" in terms of cost/size where I can build a bank of capacitors without breaking the other sort of bank - it looks like probably being around the 20 x 47,000uF (like this design uses: ) mark, but I wonder if anyone with more recent component purchasing experience than me can provide some pointers? The voltage rating needs to be in the 20 to 30 volt range. Oh, and when I've finally built one, I'll post an instructable, I promise! My version is likely to be rather more analogue though as I don't know anything about microcontrollers.....

Question by throbscottle    |  last reply

1 Arduino + 3 or 4 LM35s?

I am a total beginner, having logged about one hour here (the last hour). Does this sound OK for a first Arduino project? I want to sample and log the temperature outside at the surface and at depth for a total of 4 readings to a depth of around 50cm (20"). The reason is to consider if I should provide my daughter's pet rabbits with an underground burrow as relief against the next heat wave. It seems a nicer option than running a swamp cooler all day. Though I suppose I could use an Arduino + LM35 to turn on and off the swamp cooler :) It looks like I can do it with 4 x LM35s, an Arduino One, some sort of data storage, a 9v battery and a bread board. Any recommendations for if I should use WiFi or an SD card for storage? My guess is the SD card is simpler to programme and maybe less of a battery drain. It seems I just need to hook up the data out of the LM35s to the analogue ports, then loop over the inputs and write the outputs to a file somewhere. And calibration too. Any pointers on how to turn the LM35s into probes that can be buried in the ground? I was thinking I could bind all the probes onto a dowel, dig a hole and bury it. How to extend the LM35 pin outs? Thanks in advance for any suggestions.

Question by FargingIcehole    |  last reply