Hydrogen Generators

Does anyone know how to test for output quantity of HHO gas from a Hydrogen Generator when connected to a vacuum such as your intake manifold? The output is easy to test when just checking with a submerged bottle with the generator running on its own without being hooked to a vacuum source. The generator will put out substantially more volume under vacuum than when not. How do you check for output volume when under vacuum? Pylgram

Posted by Pylgram 9 years ago


I am wondering if you run a led at full voltage and amps then as you add more resistance light output goes down here is my question 1 led at 20ma or 2 led at 10ma do not 2 leds give more light than 1. Like is light output a linear taper to amount of current applied or is it more of an audio taper?

Posted by John1397 4 years ago

how do i add an extra output to my r/c reciever circut board and remote control?

Hi, i was wondering, how do you add an extra output to a r/c reciever circut? what i have is a reciever from a small r/c truck, and im planning on turning it into a tank that requires 3 out puts , not 2 that the reciever has. curently, my controller has 2 levers for making either side of the truck move, both and the truck moves forward 1 and it spins, what i need is a third lever to operate a relay to set off a cannon. what i have currently is a second reciever that opperates on a different frequency to the truck, could i possibly merge the two without using a second controller?

Asked by oldmanbeefjerky 7 years ago

DVD to VGA output

Hey guys,Heres the hardware I have. Just wondering if I could use the existing cables and hardware and turn this into a VGA output? It's from a Haier 7" DVD player. I know DVD players have a crappy output and visual clarity, but....wanted to do something with it... :(

Asked by Asmodean_7 8 years ago

Bug in search results which include forum topics

When an Instructables search includes forum topics or comments from forum topics in the results, each of those items has an error associated with it.  Instructables which are search results have a trailer line "by in : ", where each of the keyword items is an appropriate hyperlink. For example, searching for wind tunnel includes   VAWT Lenz type. Stage 1. Converting wind power to rotary motion. Jul 9, 2010 ... This VAWT takes advantage of a natural wind tunnel affect I get between 2 of my sheds. The unit has to be free standing so it can be moved ... by Dr Qui in workshop: energy But the same search also has the following: Wind energy to light up a car top sign? I was thinking that it might be a good idea to use the wind from the car ... that said if the sign is hollow you could make a wind tunnel ... TypeError: Vars.richSnippet.document is undefined: Vars.richSnippet && Vars.richSnippet.document.author

Posted by kelseymh 7 years ago

How do I make a headphone jack cancel the output of the speakers when headphones are plugged in?

I made a small stereo amplifier with 3 inputs, and L and R outputs for speakers,  but how do i make another output that cancels out the speaker output?

Asked by metsfan1938 7 years ago

How to protect OpAmp output?

Hi, I have an OpAmp which controlls the Gate of a MOSFET. When the MOSFET dies, sometimes the voltage it's running on (50V) somehow gets to stand over the OpAmp's output which destroys it. What's the best way to protect the OpAmp from the high voltages that get to stand over the output? Will a zener do the trick? Trigger transformer won't be easy to use here because It's a PWM controller so I need nice block waves. Diode on the output? but won't this be bad for delivering good current to the Gate? ... Any ideas?

Asked by DELETED_Electorials 6 years ago

Help with Audio Output Transformer

Im doing this project: http://www.wikihow.com/Transmit-Audio-With-a-Laser-Penand im confused about what to connect the audio output transformer to, the one they suggested, and i do, has red and white wires on one side, and green, black, and blue wires on the other, with the black in the middle. Where do i conenct them?

Posted by um0123 8 years ago

Headphone output into mic input?

I've got a cheap voice changer that is hard-wired to a computer-style microphone. I cut off the mic and added a 1/8" miniplug adapter, so as to increase flexibility. I need to connect the powered headphone output of an mp3 player to this voice-changer, what is the easiest way to do so? I tried an attenuator I had lying around, but got no results (are attenuators one way?) is there a good (cheap) solution to this problem?

Posted by gschoppe 10 years ago

Audio input switch

I need this simple device, because i have two audio interfaces (one for guitar recording and one for vocal recording) and when i change audio interface i need to disconnect output cable, of first interface, from my monitors and then connect output cable from second interface to my monitors. So with this I can choose between two different stereo audio inputs and send one of them to output. I am using TRS connectors, but i will also need XLR version of this. Check out this picture:

Posted by Necrofenser 4 years ago

wich is input and wich is out put? Answered

On a hand wound transformer for a joule thif wich is the input and wich is the output primary in? secoundary out?, also does it matter if the thick wire (primary) is on the bottom with the thinner (secoundary) is on the top?

Asked by bushman9 3 years ago

LF Help on Audio Input and Output

Looking to build an 'audio switch' for my devices on my network or have a circuit board to have on my desk. I have 5 computers (windows/mac/linux) I run at any given time, some used for Skype, Youtube, Music, and/or Gaming. I am looking to make something that I can connect up with 3.5mm sound and mic jacks to a main board and controlling the input and output to different speakers and headsets all on 3.5mm.  Ideally I'd like to have volume control on the board itself, but isn't required. Does anyone know of a instrucable already made?

Posted by AlexR32 2 years ago

Use Output as Input

Hi ! I have this program, Finale 2005b. I've searched everywhere, and I cannot find any way to export the music I produce in there as a real audio file (NOT a midi). So, to achieve this, I have decided to record the output as the input... using Audacity , actually. To do so, I used a simple mono cable to go from my headphone to mic plugs, and set the volume to the minimum... to avoid too much amplitude going in. Now, for the use I want it, this method is way too dodgy (plenty of interference, specially each time I move the cable 1 mm...) I'm pretty sure there is some program or solution to directly map the stream around... I don't have much funds, so free would be good, and btw I work on Win32. Thanks

Posted by fxsapa 9 years ago

Where should I plug in my computer to my old stereo system? Answered

I have a stereo system that is very old and doesn't have a place specified for computers. I have a number of things plugged into it, and the only remaining spots are: Tape-2 (Monitor), VDP, VCR-1, and VCR-2. Which would be best to plug the computer output into? (I've got it all set up with adapters so it fits the RCA plugs). Thanks.

Asked by jessejwk 7 years ago

Comparator doesn't work as expected? Answered

Hello, I'm having a strange problem with the LT1016 (http://cds.linear.com/docs/en/datasheet/1016fc.pdf) When the -input is at 0.630V, and the +input is at 0.555V, and the comparator is fed with 5V, the outputs are because of some reason Q(inverted) = 2.10V and Q = 2.67V 2.67V for Q is just out of specifications (minimum High voltage of the pin should be 2.7V). 2.10V for Q(inverted) is not good as it should be less than 0.3V in it's low state. The "latch enable" pin is grounded. Both output pins are not connected. Why doesn't Q(inverted) go to 0.3V and Q to 3V, as the datasheet suggests? I tested this with another (also new) comparator; also an LT1016, and it behaves exactly the same. Pins: 1 V+ 5V 2 +IN 0.555V 3 -IN 0.630V 4 V- 0V 5 Latch Enable 0V 6 GND 0V 7 Qout 2.67V 8 Qout(inverted) 2.10V Any ideas?

Asked by DELETED_Electorials 3 years ago

can someone help me put an output jack on my guitar amp? and help with my amp stand?

So im building a guitar amp stand made of wood. my future plans are to put up to 4 12-15" speakers in the stand. i dont have the speakers yet but i plan on getting them soon so i need a way to put an output jack on my amps. I had plans to simply attatch a 1/4" jack to the leads from the amp speaker but I now have second thoughts about this because of the fear of doing damage to them (i had the same problem with my computer speakers and I blew out the amp) so how else could this be done? amp 1 -- -guitar amp -19W -transister amp 2 -- -bass amp -35W -transister i dont know if this information helps at all i also want 3 separate channels 1 for each amp (i might possibly get another amp so i want to be prepared) if one is a bass and the other a guitar amp do i need bass speakers or will any do for the Bass i want to control the volume of each channel separately so i will need to know what kind of potentiometer to get and i want the sound to be decent if one amp is not in use at the time basicly i want the stand to act like a high proformance cabnet with volume control and separte channels can this be done? Ive drawn a design is the wireing correct or can it be beter

Asked by fastcar123 8 years ago

AV output socket in TV set.

Hi all i am finding difficult using the AV output socket in my TV because it have only one output socket. I have to plug it out and connect to what I may intend to use (VCD,VCR,HIFI). Can someone suggest a way or a circuit to make (4 AV output will be nice). Thanks.

Posted by sunwah 9 years ago

Basic Op Amp question

Hello, If the input to the positive terminal of an op amp is 12V, the input to the negative terminal is 10V, and there is no supply voltage, the output voltage is 2V and the output current is 0. Correct? Now, what I don't understand is what happens to the output voltage and current if I connect a supply voltage of, for example, 15V. I know that the output voltage and current both increase, but I don't know the math behind it. Can someone explain this to me, please? 

Asked by frossiove 5 years ago

Solar Versus Wind Power: Which Has The Most Stable Power Output?

Due to the larger magnitude of solar PV power output fluctuations relative to those of wind at time scales shorter than approximately 31⁄2 hours, the costs of large scale solar PV integration are likely to be larger than those of wind.via Treehugger

Posted by ewilhelm 10 years ago

where are the outputs on this wireless receiver Answered

Hi, i am planning on buying, and another instructables member already has, buying this wireless receiver (comes with a transmitter), for use in whatever we desire to use it for! heres lins to two images of it, i dont understand a bit of it, only i see the inputspostive and negative, and the outputs positives, but thats it , which make no sense to me. http://downloads.villageorigin.com/001540-015/Diagram%202.JPG http://downloads.villageorigin.com/001540-015/Diagram1.JPG anyway, what i know is where the positive and negative terminals are, also, the othe rmember has already tried running this using the ground terminal as the negative for the outputs, but says it does ot work at all, and that is the only thing which seems to make sense. also, this is the only thing the ebay seller could give me in regards to operating and installing this chip into anything, because they know nothing of it, and asume that the ebay users who buy it already know how to use it. anyways, there are several ports d0,d1,d2,d3 vt, vcc, and ground al the d's are the output ports, vt is called switching voltage and is assigned to an output depending on what button is pressed on the receiver, and thats all the information i have gotton. and from what i know, its inoperable, but then again, i dont know much about that stuff also, who ever shos me how this work, i promise wil get a "best answer" from me.

Asked by oldmanbeefjerky 7 years ago

Can I wire these speakers in sequence? Can I use input for output?

I'm filling a box with multiple different speakers I have salvaged from different items. I would like to wire these speakers in some kind of sequence. Basically, I would wire one to the source, and then I would wire the next speaker to the speaker that's already been wired, using the solder to connect. Would this work correctly? Also, I have a volume switch that uses A/V connections. The problem is that it has three inputs but only one output. I would basically like to reverse this. Is it possible?

Asked by metalshiflet 3 years ago

RGB TV Output of Gameboy Color?

 I'm absolutely stumped by this. I have my gf playing my old gameboy color but the screen cover is pretty scratched up and I don't feel like peeling it off until I find something to buff the scratches out. I've nearly googled it to death and all I come up with is random websites selling gameboy advanced tv out adapters. I know this HAS to be possible as www.hackaday.com/2008/11/29/gameboy-color-on-an-led-matrix/ The guy says in his comments on the youtube page that he does IN fact have a real live gameboy color hooked up to the LED matrix. Yet he does not explain how he hooked it up, obviously he did it somehow. Does ANYONE have any bloody clue as to how this is done? I'm not afraid to do some soldering as I know that'll probably be required but really how hard can it be.

Posted by Punkguyta 8 years ago

Can I add an audio out jack to a desktop radio (stereo) with isolated left / right channels?

The plan was to add a stereo output jack and a switch to turn the speakers on/off. This way I could leave a cord plugged in and still have the option of switching the unit's speakers on or off. Anyway, a visual inspection of the circuit board shows that the two grounds are isolated from each other. The plan was to tie the grounds together and switch with an spdt between speakers and the jack, then add another set of positive leads to the jack for left and right. Now that I see they are on isolated and separate circuits, I am hesitant to tie them together. Maybe I just need to go with RCA jacks and a dpdt? I guess my real question is "am I going to blow up my radio?" Do I need to worry about dummy loads or about frying the driver circuit? I realize the audio level will not be "line-out" and I have read that a 1k resister will help, but I don't mind turning down the volume before running the signal to another amp. Thanks!?

Asked by elNorm 7 years ago

Fully insulated channels?

I was looking to TENS units for experimentation and to try to rid myself of knee pain without meds. I was also looking into potentially building one due to the fact that i could probably do it cheaper depending on how i decide to do it. One of the TENS units i saw said that there was dual channels that were fully insulated, while another one i saw said duel channel but was not fully insulated. What does this fully insulated channel mean, and how would i do that in a DIY TENS unit?

Asked by pmk222 1 year ago

Project in mind. Need ideas for simplicity.

I have a project in mind. I have children with a pet cat. I intend to build a charcoal filtering for a catbox/cat tree I am building. I want to use an alarm clock (easy to adjust time if needed) to activate maybe a buzzer and flashing light daily for box cleaning. The fan runs at a low speed constantly at the top of a vent tube to keep the smell controlled.  I want an input to reset the buzzer/flashing light when the drawer with the litter box is opened. I have no idea how to build the circuit. I tested the filter system on a mockup box. It works fine cat doesn't notice the fan. (its 3ft up a 3" piece of PVC). The lack of smell is the reason I'll need a reminder. I could purchase an industrial programmable relay but cost is a huge factor and buying an added power supply etc for control voltage adds up. I have an industrial electrical background and no problem working with small circuitry but have never designed anything so hints and help will be appreciated.

Posted by alienmemebr 5 years ago

Reducing 110v transformer output? Answered

Hi all, as stated in the title I need to reduce the output of a 110VAC transformer. I'm using a US graco spray gun that is 60hz, and I understand that if I reduce the voltage to 90 this will compensate for the UK 50hz system. Any help is greatly appreciated

Asked by dimmaz88 4 years ago

How can I reduce the output voltage of a zener diode?

Hello, My main goal here is to get an LED to light up when it "detects" over 30V, regardless of the specific output of the voltage source. I attached here an image of the circuit that I currently have. The output of the zener diode is about 30V. What I want to do now is reduce this output to 2V in order to light up an LED that has a 1.8-2.2 VDC forward drop and a max current of 20mA.  I was thinking of attaching a voltage divider to this circuit in order to lower the 30V to 2V, but I'm not sure how, especially with the zener diode involved. Can anyone help me?

Asked by frossiove 5 years ago

Is it possible to emulate the output of an xbox controller from a PC?

I was wondering whether there is a way to make a PC output xbox 360 signals through its usb port. I want to get a wiimote to work with an xbox 360, and since I can already control a PC using glovepie and a bluetooth adapter, wouldn't it be possible to take the wiimote input through the computer, convert it, and feed it directly to the xbox as if the PC were a controller?By the way, I already tried posting this in the forums but got no replies: https://www.instructables.com/community/Xbox-360-PC-Output-Emulation/

Asked by jasper28 8 years ago

How can I make my own USB hardware (Basically Input Output)?

I am looking for a Way to Have my computer (using C++ if possible) interact with a device made by myself through the USB port. Basically Input/Output.

Asked by GMer56 9 years ago

Xbox 360 PC Output Emulation

I was wondering whether there is a way to make a PC output xbox 360 signals through its usb port. I want to get a wiimote to work with an xbox 360, and since I can already control a PC using glovepie and a bluetooth adapter, wouldn't it be possible to take the wiimote input through the computer, convert it, and feed it directly to the xbox as if the PC were a controller?Sure beats doing this: http://obsiv.spaces.live.com/blog/cns!948789BF56FAF394!177.entry

Posted by jasper28 8 years ago

AtTiny85 port analog / digital setup order bug

/*How to configure port setup in correct order AtTiny? Bug in combiler or  what is wrong here? Circuitry here has two LEDs and one analog input.  LEDs are ON or OFF depending voltage of potentiometer. Simple code below makes digital output PB1 high impedance, so LED current is too low because voltage drops. If port configuration setup is made in other order port output works fine. */ /*                     ___     D5 PB5  1|o      |8  Vcc     D3 PB3  2|        |7  PB2 A1   Voltage measurement, potentiometer     D4 PB4  3|        |6  PB1 D1   --|>--|          GND  4| ___|5  PB0 D0   --|>--| */ byte led0 = PB0; byte led1 = PB1; byte potentiometer = A1; int voltage; /* It is important in which order pin configuration has been set. Wrong order causes PB1 to high impedance, low current, output. This must be combiler bug, I think. If port BP1 setup has been made using straight to register there is no problem in order. Any other analog input port and digital port combination works correctly. */ void setup() {   pinMode(led0, OUTPUT);   pinMode(led1, OUTPUT);  // Doesn't work if this is before pinMode(potentiometer, INPUT);   //DDRB &= ~(1   pinMode(potentiometer, INPUT);    //pinMode(led1, OUTPUT);  // Works if this led1 setup is after pinMode(potentiometer, INPUT); } void analog_input() {   voltage = analogRead(potentiometer);   if (voltage     digitalWrite(led0, HIGH);     digitalWrite(led1, LOW);   }   else   {     digitalWrite(led0, LOW);     digitalWrite(led1, HIGH);   } } void loop() {   analog_input(); }

Posted by PaavoM 1 year ago

How does a 3d TV interface with a gaming console?

I am trying to build a small circuit board with a microcontroller that will be able to trick a PS3 or XBOX into thinking it is connected to a modern 3D Television. Once this works, other hardware/software can handle the video and audio output, but I have no idea where to find information regarding how to make this "secret handshake" between a video device and a gaming console. Does anyone have any ideas, information, or just places I could look to try to find this info? Thank you!

Posted by Runiko 4 years ago

Can I use a DPDT Toggle Switch, To switch a Transformer output from series to parallel?

Hello,  I am working on a project were I need to use both 24V and 12V ( one at a time ). The project originally calls for a Radio Shack 273-1512 but I needed a smaller pcb though hole mount transformer for my use. My transformer outputs 24V @ 1.5A in Series and 12V @ 3A in Parallel. Is it possible to wire up a On-Off-On DPDT Toggle switch so I may flick back and forth between the two? If so, would you be so kind as to provide a diagram. I have a feeling I am over thinking this and just need to take a step back to see the whole picture. I thank you for your help and advice in advance. Transformer I have -Hammond 164J24 115V Here is a link to the data sheet. http://www.hammondmfg.com/pdf/5C008-9.pdf DPDT switch I have -NKK S7A-RO Here is a link to the data sheet. http://www.mouser.com/ds/2/295/stogglesmedcap-33336.pdf

Asked by kyo-89 3 years ago

Need help with DMX512 to Analog 0-10VDC Decoder

I am looking to *update* some old strobe lights that my theater uses to be able to control them through our DMX control board.  They have 2 analog 0-10V inputs to control the flash rate and the intensity.  I am looking for the simplest solution as we do not have a lot of money to throw at this project.  I have some experience in electronics as well as working with arduino, but not enough to tackle this job by myself.   Any thoughts on this would be appreciated!  Attaching the control spec sheet. Tom

Posted by AJackOfAllTrades 3 years ago

Scanner inverter outputs

I've just been wondering about the output of scanner inverters for a few projects, what kind of voltages and amperages are they outputting. I have a few little ideas but don't really know that much about their outputs, I gave googling and parts numbers a go but mostly found unrelated pages or had no luck with part numbers...

Posted by killerjackalope 9 years ago

ttl output (binary) barcode reader module

Hello there;  I am working my final year project on library management system which needs to include a barcode reader hardware. As i am told by my advisor i can't use a barcode reader whose out put is the final ASCII value rather i have to get a binary (0 & 1s)output from my hardware, then convert that value using arduino or my C# asp.net code to generate the final result of the barcode for the book.   So, what is a looking for is, a ccd camera based barcode reader module whose output is ttl (or binary) i.e before it is decoded.  Any idea where i can find such a device, please   Any comment is welcome.  10x for your time.

Posted by Hailye 1 year ago

need a lipoly charger with output?

 hey i need help with something iam trying to make a charger for a backpack but i ran into a snag to say i need a charger like this www.sparkfun.com/commerce/product_info.php it says 7v max the solar panel and battery i have are 7.4v. will this be ok and work fine? do you know if i can get something that will work like that charger? any way to drove the voltage down to 6 before it gets to the board?  thanks for any answers  

Asked by joesome 8 years ago

What are the specs of microwave transformer? Answered

I am trying to build an AC arc welder from transformers. I need to know how many amps, volts and watts a normal microwave transformer outputs because i am trying to use different transformers, as i don't have two microwaves on hand. -Thank You

Asked by shammallamaman 9 years ago

Audio switch with four inputs and push button toggle?

I'm looking to create a device similar to this instructable: https://www.instructables.com/id/Audio-switch-2-inputs-1-output/ However I need four inputs and I would be using a push button as the means to jump between inputs. If I could also have some sort of indicator LED that would be helpful. Not quite sure how to tackle this project.

Asked by Nameless37 3 years ago

How to make a simple USB Hardware ?

How can i create a basically usb hardware ( input/output like a Button and a LED ) and connect that to my PC. so when i press the Button (on the board) , a code runs ( run a program or .... ) . and when a code runs on the pc , the LED light on. I think it'll a simple project, but i asked it and people replied me that i have to make a driver for this device, but i dont know what i have to do :(

Asked by amirreza619 4 years ago

How to change the configuration of a lithium cell pack ?

I’m working on a project were I have to be able to adjust the voltage of my output by 3.7 volt increments. Example: 12 18650 batteries hooked up in series and have the voltage change from 44.4 to 22.2 to 11.1 Essential I’m trying to go from a 12s to a 3s4p or 4p3s cell configuration.

Asked by prostructables 1 year ago

Output from flyback transformer question?

Hi! I scrounged and old crt flyback and I have set up a small transistor-driven oscillator to put power into the primary. It works too, but I don't know if the output is AC or DC. I think it may have a rectifier in it, but I'm not sure. Is there an easy test to determine whether it is AC or DC? I'm planning to use it for a tesla coil, but I want to know the output wave form first. Some sort of pulsed DC would as be acceptable for my uses as well.  Does anyone know what I can do to determine the output wave?  Thanks! (PS: I don't have an oscilloscope)

Asked by transistorguy 7 years ago

Converting at 9V solar panel output to 5V using diodes and voltage regulators

Hello i was recently sold a solar panel which was the wrong voltage i need to step down the output from 9V to 5 or 6V. I have been given two TA7805S voltage regulators and 6 diodes and told i can do it with these but i don't know how any ideas?

Posted by henrycrone 5 years ago

Volume limiter circuit?

I need help designing a circuit (off of another circuit) that will limit the output voltage to X. I need X to be adjustable from between 0-700 mV. However, I need it so as the input voltage goes up, the output voltage will stay at what it was set to. Without clipping. Any advice? Thanks!

Asked by heyzuphowsitgoin 8 years ago

Different wait times in IC output.?

Hi, is it possible to make an output with different Wait Times? The numbers are the time in seconds. The HI would be the enough to make a buzzer beep, like half a second... I was thinking of 555 ICs, but I don't think it's even possible to do this with them. Do you suggest any IC that can do this? I just want a buzzer (or whatever) to beep like: Power On - 30sec - BEEP - 180sec - BEEP - 30sec - BEEP - 180sec - BEEP, etc Thanks.

Asked by pedrotome 8 years ago

Really Mini Shocker?

Hi all, I am looking to build a really miniature, low-output shocker device and I've come a bit stuck. The instructables that I have see here all seem to dispense shocks of about 400v and I think they are too painful for what I have in mind, though I don't really know (if you know better then please tell me, you may make my life easier :) ). I'm looking for the device to be able to deliver no more than a distinct nip, and be about the size of a Cr2032 cell. I also would like a miniaturised power source like that. Can anyone tell me if this is possible and point me in the right direction as to parts and where to get them (I'd like to salvage as many parts as possible because I'm on a tight budget). Thanks in advance to all who reply.

Asked by BlondGuy101 8 years ago

Input and output? Answered

How you managed to place input and output points on the board?

Asked by RishabhJ32 12 months ago

Input and Output? Answered

What are the parts I need to use in Eagle for the input and output pins?

Asked by APratham 5 months ago

I have Lenovo IdeaPad B575 Laptop And I am stumped by the task of using my laptops lcd screen for playing my xbox 360 on Answered

 The laptop has an hdmi port on it, but i dont know if i can use that as an input from my 360.?

Asked by Laserman595 6 years ago