I am on a budget of $80 and i want to make a guitar amp with volume control, gain control, and a speaker. can someone help me do this? please?
Asked by boedogs 8 years ago | last reply 8 years ago
http://i240.photobucket.com/albums/ff32/evildrew81/people%20and%20stuff/saw_doll_tv.gif -Can anyone help me with making an animatronic mouth such as the one in the video? Can I use a RC Car servo? -Can someone also help me with a neck that can turn? Could I just use the back servo of an RC car so that it goes around Clockwise, and in reverse, Counter-Clockwise. -Is there a remote for servos that can controll up to 3-4 servos at once? Any help will be appreciated. Thanks.
Posted by ChaoBreeder 8 years ago | last reply 8 years ago
Does anyone know a super simple game console hook-up? I don't really know much about circuit boards, and electronics, but I'd like to learn. What I mean by simple is: a power supply plug for it, AV cable plugin, an on/off switch, controller ports, and game cartridge port. To be specific, I'd like to be able to build a smaller, simpler version of a Sega Genesis, or N64, or whatever. --- Thanks!!
Posted by kenizl86 7 years ago
Hello, I am trying to make a simple comparator with a LM339N. I don't understand what is wrong with the circuit. The output is always low, even when the inputs are reversed. The schematic is attached--the schematic doesn't include the two 100k ohm pull-down resistors on the inputs. Thank you.
Asked by dboone628 8 years ago | last reply 7 years ago
I need a way to turn on an LED after a certain amount of time (e.g. 5 minutes) then keep it on until a momentary switch is pressed. a very low power consumption if possible, because it's going to be wrist mounted. thanks in advance
Asked by DrVonTrap 8 years ago | last reply 8 years ago
Alrighty, I'm a n00b to this world but I'm really into it. I just bought a simple amplifier kit and put it together. It is a stereo amp but I am only getting output to one speaker. The only problem I can think of is how i rigged up the inputs. I took a 3.5mm jack and combined the ground from the left and right channels. Can you not do that? How do I fix this without running two individual mono channels? Thanks in advance!
Asked by abroadhead 4 years ago | last reply 4 years ago
Hello , I need help,I am posting schematic. I don't understand ,that how program counter know some instructions (jump , branch , subroutine call ) I have attached two diagram.look the 1st diagram.I am using 4 counter. how to improve that circuit for program counter .
Asked by vead 4 years ago | last reply 4 years ago
Uuhhh..I'm not really sure about this..i'm an electronics engineering studentand my instructor in Logic Circuit and Switching Theory requires us to make a project which will include logic gates.now i searched in the net for some ideas i found two..but i know i shouldn't copy their projects..can anyone help me?link2link1thanks guys!
Posted by hazelcharisse 10 years ago | last reply 10 years ago
I wish to make an extremely small (size and part count) AM transmitter using only a few transistors and passive components. I wish to transmit an audible tone on a set frequency.I am thinking along the lines of a transistor flip-flop circuit oscillator, perhaps routed through another. It really needs to have less that five/six small components. DIP components are too big. Small electrolytic and other capacitors, transistors, and resistors are acceptable. Transmission distance needs to be at least 1/4 of a meter, but further is better. It needs to run on between 1.5 and 6 volts, low to middle'in milli-ampage im thinking watch batteries for a few hours at least. I have read the following article but as stated before it needs to be very small. https://www.instructables.com/id/Make-a-simple-AM-transmitter/Can anyone help me out with a schematic, thoughts or advice?Thanks in advance,-AndyP.s. I can work out transistor loop timings and I understand how the Amplitude Modulation system works. Current thoughts/plans (if you can call them that) are an audible tone switching a secondary transistor loop from high (no resistor in series) to low (resistor in series) power and back. The secondry loop will be switching at the target frequency.
Posted by andy 11 years ago | last reply 11 years ago
Hi to everyone! I am new here and will really appreciate any help or advice on my project. Truth is, i am very new to electronics and thus, have little knowledge on how to proceed with my project. In summary, my project is basically creating a friend(robot) that will activate upon receiving electrical impulse from a mic. The motion it will have is basically the lighting up of LEDs (for the eyes) and the head tilting upwards (using servo or DC motor idk...) when sound is detected. However, i want the motions to be there for 30 secs even after there is no more sound before reverting back. I have done many research regarding this but it is just too complicated for me to understand. I would really appreciate it if the solution or advice is simple enough for beginner to understand. Also, i don't want "clap" activated, i want it to be sound activated like simply speaking normally. And i hope to avoid using micro controllers. I would probably ask even more questions in the future, so, hope i will get along well with everyone here! p.s this project is a very scaled down version because i wouldn't be able to handle the full scale electronics...
Asked by DIYfreshie 3 years ago | last reply 3 years ago
I have a small simple speaker - just the magnet part, with no wires - and i have connected the positive and negative terminals to a simple 3.5 mm audio wire. The speakers play sounds, but at a very low volume even when the volume is max. Is there anyway to increase it?
Asked by freerun 6 years ago | last reply 6 years ago
I need a simple, not powerfull, linear engine. It has to move just like an inch back and forth, chaning directions on its own when it reached the end of his stroke. Even 5mm would be enough movement. I think about of something based on a neodymium magnet in cylinder shape. It has to be as simple as possible, i don't need any control for frequenzi, because if it works.. i can work out more from there on my own. Only thing important, it has to be small, like the lenght of a half pencil and 2cm in diameter would be ok (for the moving part, electronics placed elsewhere don't matter). A normal rotating engine with a shaft doesn't work for the design i have in mind :(
Asked by wupme 9 years ago | last reply 9 years ago
Soooooo, I don't have a whole lot of knowledge about electronics. But I'd like to make/have someone make a single LED bulb that lights up when a microphone recieves sound. I'd 'actually' like to fit a small microphone into a helmet's mouth section, and have an LED activated on the outside. If it's possible to incorporate a speaker on the outside as well, that'd be incredible. And even more-so, if it could change/amplify your voice on the way out, that'd be simply orgasmic.
Posted by Wrel 8 years ago
Need help to make a simple sound board for and educatinal kids game. needs to have 5 or six different 1 min long sounds connected to individual on off buttons.......any idea for the technically challenged would be appreciated.?
Asked by terrijoy 9 years ago | last reply 9 years ago
I want the LED to turn on when it's dark. But it remains on and taking out the LDR doesn't affect it. I couldn't post a picture but i made a replica in Fritzing EDIT: The transistor is 3904 NPN.
Asked by Hafiz Mohammad Shayan Tariq 6 years ago | last reply 3 years ago
Greetings, We have a school project and we must a build a DC generator, and I want it to be D.I.Y., but I have a problem, I don't know if the generator I am planning to build can make enough power to make small loads work. My armature is made of several laminated "I" core with winding of AWG#24and1/2, that's my plan, but how many turns shall I wind? is the laminated Iron core enough or should I use iron core instead?, do I need a strong magnet? Thanks in advance!
Asked by Mechron 6 years ago | last reply 5 years ago
Hi everyone, A friend of mine has a project which involves using a large amount (40+) standard 5mm LEDs to light a frame to a uniform brightness with the ability to dim the entire setup uniformly. Due to the shape of this frame its not economical or practical enough to use strip lighting. Rather than try to explain the circuit design I came up with I have included it as an image. Essentially I'm worried that I've overlooked something in this design and was wondering whether anyone with more experience would be able to take a look and point out any problems I've missed. If anyone has the time I would be incredibly grateful.
Asked by Zaryck 3 years ago | last reply 3 years ago
Posted by DavidGatti 3 years ago | last reply 3 years ago
Well I have a friend who is looking into the purchase of a snake, and meanwhile picking out the snake and the heating element isn't the hard part for him (he's looking at a 23 watt 120vac heating pad for it). He was also looking at a thermostat designed for snake tanks, however they want close to $150 for it, and it doesn't even have many features, it's basically a black box with an 3 digit lcd and a programable timer. I know it wouldn't be hard to put something similar together from a pic and a few different parts, however it's been a long few years since I've designed a full schematic of something, let alone look at one. So I was wondering if someone so kind might aid me in making of a schematic so my friend can go order the parts he needs and I can build it for him (don't have a problem assembying circuits from raw schematics, I find it fun). However, there is a couple things he wants out of it. Number one most importantly, he wants it to be able to adjust the output voltage so he doesn't fry his snake (most simple thermostats simply turn on until temperature is reached, then off), no he wants something more dynamic than that. Second, he needs to have an external temperature probe so that he can keep the thermostat outside of the tank whilst keeping a handy eye on the temp and also obviously so that the thermostat knows when to come on (is there a limit to the length of wire you can put on a thermocouple?). Third and last, we need a simple timer circuit that keeps track of the time (what's that involve? a 13mhz crystal and a few other parts?) so that at night the thermostat can change it's "heating schedual", I assume so that it tries to maintain a temperature say 3-4C above the programmed temp. (night mode anyone?) However the thermostat he was looking at buying wanted you to buy a second cord, which connected to an external appliance timer (yes you heard me, a $9 wall timer) so that it knows what time it was. My friend really needs this as he's looking into getting this snake within the month. I appreciate anything anyone has to offer. Thanks guys! -Punkguyta
Posted by Punkguyta 10 years ago | last reply 10 years ago
Asked by Pass Rusher 9 years ago | last reply 9 years ago
I need to be able to see the charge level of a 12v rechargeable battery and want it to be as simple as possible. Would this setup work: 3 zener diodes (at different breakdown voltages 10, 11 and 12 volts for example) with cathodes connected to positive so that when the battery was above their breakdown voltage an led could light up. Here is a diagram:
Asked by Scytheon3 7 years ago | last reply 4 years ago
I'm after a simple transistor-based oscillator for the basis of a 1-octave organ. I want to use recycled bits, which I have a lot of, and I reckon someone knows what's good as opposed to going looking for something. Crude, basic, simple, nothing sophisticated. L
Asked by lemonie 8 years ago | last reply 8 years ago
Hello I want to make a simple 3 floor elevator model. The Elevator should have UP and DOWN switches on every floor and should act as all normal elevator. I need a simple and detailed circuit design and which components should I use for it. Circuit using Arduino Uno R3 is also preferred. Can someone please help me? Thanks
Posted by mbmz92 4 years ago | last reply 2 years ago
Hello guys I have a question. I'm just trying to make a simple, cheap, voice changer like the little stupid toys you buy from the store. How can I do it? I've looked ALL over the internet, and can't find ANYTHING thats simple like the little toys you get. Plus the ones I do find are too expensive. Thanks,
Posted by HavocRC 6 years ago | last reply 6 years ago
im trying to make a replacement homemade POE for a microwave. i need to convert 48-54vdc from a rectifier down to 24VDC as easily and simple as possible. is there an easy circuit? ive thought of using a dc/dc converter but it cost about $150. can i build it for less?
Asked by iclymd2hi 8 years ago | last reply 8 years ago
I want to make a simple circuit with a microphone that just takes your voice and sends it to a speaker. I just want to understand how to hook up a mic. I know it will either be very quiet or silent, but like i said, i just want to know how to connect it. (I already know how to make the amp.)Thanks in advance. -Julian
Asked by jules15 8 years ago | last reply 8 years ago
Hi guys. I've been making some very simple mechanisms for a steampunk Instructables series I've got planned, and have been prototyping using cardboard and paper. This has actually worked really well, but I'm a fan of the digital realm, too, and was wondering if anyone could recommend some simple, cheap (ideally freeware) digital prototyping software to help me eliminate (or minimize) the paper and card phase? As I say, the mechanics are very simple. Cams, pulleys, levers, gears -- nothing more complex than bell cranks, linkages and basic drives. I think a scotch yoke is about as adventurous as it's got so far. So I'm looking for some nice simple software that'll allow me to build and test the mechanisms digitally, if such a thing exists. I've looked at the likes of Autodesk and Blender, but they seem like a sledgehammer to cure a headache. Even something that runs online in a browser, or an iPhone/iPad app would be good (I've played some physics-based games on the iPad that would almost be ideal if they weren't puzzle games!). Any advice? Cheers guys!
Posted by SpannerSpencer 7 years ago | last reply 5 years ago
Would this simple schematic create an effect similar to that of a Flanger guitar pedal? The diodes prevent the signal from traveling backwards. On the top, the inductor (variable and homemade) slightly delays the signal from the guitar, and it is rejoined with the original signal below it. Would this cause a wobbly effect like a Flanger? Definition of 'Flanging': http://en.wikipedia.org/wiki/Flanging (link)
Asked by josh1324 6 years ago | last reply 6 years ago
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 5 years ago | last reply 5 years ago
Hello , i have a problem when im making my portable amp.I use the little MK2 schematic , but i want to add a simple tone control , then i place the tone control between buffer output and power amp.But the problem is noise.When i turn down all knobs (treble,mid,bass) the noise decrease but still noticeable.When i turn up the Treble knoble the noise is very loud .I dont know why and how to fix it.Please help! Thanks very much ! sorry for my bad English.
Asked by login721 6 years ago | last reply 6 years ago
I'm used to the archaic way of drafting floor plans ... T square + triangle + canary paper + pencil and eraser. I need software that will let me make scale drawings on the computer. I've tried ProDraw and another trial, but all the 'helpful' stuff keeps getting in my way. I don't want to drag every line around. So does anyone know of a (hopefully free or inexpensive) simple grid & line & scale system that will let me draw the lines where I want them to be? I have photoshop elements 1.0 and love it. But I don't see how to make scale drawings on it. Thanks.
Asked by mole1 4 years ago | last reply 2 years ago
I love those old flywheel toy cars and pump tops, but they are getting too rare to disassemble and I'd love to know how they work! I understand the push part, like in a push drill. What I can't seem to find is how to get the wheel faster and faster with repeated pumps. There must be some sort of clutch that somehow doesn't need to match speed with the spinning wheel, and it must be simple, or they wouldn't have used it in those (originally) inexpensive old toys, I do remember that there was no ratchet noise. But I can't figure it out. I know this sort of thing used to be quite common, but I'm drawing a blank on the internet. Any help will be appreciated! Many thanks!
Asked by eruger 2 years ago | last reply 8 months ago
I'd like some help to settle an argument regarding my extemely simple automatic emergency light.According to my friend, who installs emergency lighting, this circuit is too simple and has too many components missing but I say he's wrong, if one part fails it can easily be replaced. I'm not and electronics expert either.I'll explain the circuit...5v comes from a 5v 2A phone charger. Battery is a 32Ah 12v SLA. 12v charger is a smart charger with built-in status monitor.SPDT 5v relay rated to switch 12v @ 17amp maxThe light is a 12v 5 metre LED Strip with built in current-limiters and draws arount 2A.Basically, 5v powers the relay which means the battery is connected to the smart charger that keeps it topped up while there is mains power (240v here in UK). If there is a power cut the relay turns off and battery is switches over to the LED light Strip. Its that simple.It works as designed, no parts have failed and I haven't found any signs of over-heating. My friend believes it should all be one circuit and not seperate parts and is a fire risk as it is.He just won't let it go, so does he have a point or is he just being a/an _________ (fill in the blank, lol)? I've included a schematic of the circuit. Not sure if I've drawn the relay properly though.
Posted by cyberraxx 15 days ago | last reply 13 days ago
Hello. i have an LCD monitor powered from AC, that i want to make to be powered by DC for use in my car. the monitor PSU , supplies the controller with +5v and +14.5v. and i want to power the monitor from a regulated 12v psu. my question is, how would i make a dc booster, from 12v to 14.5 v at 2 ampere? thanks in advance!!
Asked by settra 5 years ago | last reply 5 years ago
Hello guys I am making a quadcopter using Arduino uno. My first simple aim is to lift and hover the quadcopter. To achieve this aim I have connected the signal Wire of all the ESC's to arduino Pin 9 and giving throttle via node server using bluetooth module and johnny five library. My quadcopter lifts from 2 sides (flips) and sometimes little bit from 3rd side also. Can anyone suggest me anything ? The thing which I am doing giving equal throttle to all motor, Is it right ? or should I give more throttle to clockwise and little less throttle to counter clock wise motors. I will be very thankful, if you guys help me to lift my quadcopter
Asked by nishanksingla 3 years ago | last reply 3 years ago
I have a United Technologies dc motor, 2.5 hp @ 120VDC, but no controller. It has a red & black wire, plus 2 blue wires. The black goes through a choke coil. Anybody have a breadboard type of design for a speed controller with hookup instructions? I can solder, follow a schematic, and wire a house, but am not up on electronics. Last radio I built was in the mid 50's, so I probably need more than usual specifics. Thanks for any help you can offer. Ed B
Asked by Ed B 9 years ago | last reply 3 years ago
Hello, I was wondering if someone could help me with a (hopefully) simple electronics project. I wanted to recreate the flashing properties of flashing construction signs (see video below) with LEDs. I bought a 555 timer and created a circuit similar to the diagram below. I ran into a few problems though: The period of the LED's on/off cycle was normally 90% on and 10% off. With some tinkering of the resistances I achieved about a 1:1 ratio of on to off but to replicate the traffic signs I would like about 80% off and 20% on or less. This circuit is somewhat bulky to make only 1 LED blink. Ideally, I would like to have 20 or 30 either all running on the same circuit or all self contained (with less complicated circuitry). At this point I almost want to get my hands on an old flashing construction sign if only to copy the circuit but I know of no way to do so legally. If anyone has any knowledge of these lights or suggestions of any sort, I would greatly appreciate it. Thanks, Daniel P.S. I have a very limited knowledge of electronics, so feel free to dumb things down a bit. Flashing Lights from Peter on Vimeo.
Posted by Strombergundy 7 years ago | last reply 7 years ago
Here's what I am trying to do. I am already controling 4 LEDs with a 9 volt zener regulator. I now want to control the source of the regulator (ie voltage from the battery on board my motorcycle) with an electronic switch. Not a big deal, but I also want the voltage to the LEDs to ramp up slowly so that when they initially turn on, they are dim, but get brighter and brighter until they reach their 9 volt regulated source. Then when I turn the motorcycle off, they fade slowly until all the way off. So I guess is what I want is a delay switch. Should I be switching the 9 volts regulated to the LEDs or should I switch the source to the regulator? What is the cheapest and easiest way to do this? Any help would be appreciated. Thanks.
Asked by Motoman9 9 years ago | last reply 9 years ago
Hi, i am a sophomore in a small town in eastern Oregon. I need help, a lot of it, in building (from scraps or anything found) the simplest circuit possible to connect a non-webcam camera to an lcd screen from an old cell phone. I have little experience and i know i shouldnt start with this, but dont give me crap for it. I can learn to do things easily but need to build two circuits like this for a helmet i am building. If you people could get me direct help or if there is an engineer floating around i need help. I am planning on becoming an electrical engineer and want to start here. Please either help or point me through the right doors. Thanks. P.S. my budget is kinda low but i can pull it through and ask favors.
Asked by budhaztm 7 years ago | last reply 7 years ago
Posted by Masterdude 7 years ago | last reply 4 years ago