## Step 2: The Schematic

So it's actually very easy.

First 555
Pin 1 goes to ground.
Pin 2 goes to .01 cap that goes to ground.
Pin 3 goes to pin 2 on the other 555.
Pin 4 goes to 9 Volts.
Pin 8 goes to 9 Volts.
Pin 7 goes to the pot and the resistor.
Pin 6 goes to the resistor and to pin 2 on the same 555.

Second 555
Pin 1 goes to ground.
Pin 2 goes to pin 3 on the other 555.
Pin 3 goes to output.
Pin 4 goes to 9 Volts.
Pin 6 goes to .1 cap that goes to ground.
Pin 7 goes to the pot.
Pin 8 goes to 9 Volts.

Pretty easy, huh!

Most of the time the APC uses a nine-volt battery. Hope this helps! :)
I'm looking at doing a similar project and I'm curious as to what is the amperage on your power supply
Great instructable. Start to a random audio thing im combobulating togther .
<p>Hasn't a good look yet but i'm on it, Thanks c:</p>
<p>nice thanks. It was my second project in electronics :)</p>
<p>nice</p>
<p>nice</p>
<p>nice</p>
<p>nice men nice</p>
<p>nice men nice</p>
<p>nice men nice</p>
got mine working, the kids love it!
<p>circuit said 500K pots but you're using 50K? Also wouldnt attaching pin 2&amp;3 burn out the pot? Why didn't you solder pin 3 to bottom of pot?</p>
<p>would a joystick be able to be used as the potentiometers </p>
<p>Hi! I built this circuit but I don't have 500k and 50k pots. I only have 100k, 10k, and 5k pots. Can I use any of these pots? Any help would be appreciated!</p>
<p>Hello there, i followed the instructions, but i really dont know how to connect the potentiometers, y tried many ways but it doesn&acute;t sound like it must do.... any help? I guess that input(Pin2) and voltage(3pin) are conected to the positive side (6V-9V) and ground (Pin1) is connected to pin 7 from the 555 chip.... but it doesnt work.... HELP!!!</p><p>thank you</p>
<p>NVM. fixed it. I used a 50k pot on the monostable and used a 500k and 50k pot in series for the astable. now my only problem is the volume pot, it suddenly jumps from real quiet to loud. I used a 10k pot foe thw volume. </p>
<p>Just a guess, but you're probably using a linear pot for the volume. Humans perceive &quot;loudness&quot; in a logarithmic manner so you will need a logarithmic 10K pot. They are generally around the same price and would be labeled with an A. Ex. A10k ( log ) vs B10k ( linear ).</p>
<p>hi, I just finished making my apc, but mine is powered by a 9v/500ma wallwart. I used a 10uf/160v capacitor and 1k resistor I found somewhere. I also used a 16ohm speaker, I can't find any 8ohms lying around. <br><br>for some reason it can't finish a whole octave, or the apc can't? or is it because of the parts I switched in?<br><br>here is a couple of photos.</p>
Just a quick question, what wattage are your pots rated at? I tried to build one using cheap variable resistors, and the second pot (Controlling the Monostable oscillator) kept burning up. I believe mine are rated at only .20 A, or 200 mA. I bought a second breadboard so I can have plenty of real estate, I think it just might have been because everything was crammed so tight that a short happened somewhere.
<p>KINDA-SOLVED: I tried a different of same idea, the APC using the 556. From collin's lab: <a href="http://makezine.com/2011/09/13/collins-lab-atari-punk-console/" rel="nofollow">http://makezine.com/2011/09/13/collins-lab-atari-p...</a><br><br>Well 1) It might have been a problem here as well, I realized I had the 1k resistor going only to pin 6 (because I placed the resistor between the pins). So at least when I plugged in the battery, I got no smoke. <br><br>But 2) I started playing around, at the lower values (~1k according to my multimeter) it started glowing. No smoke like last time, but still scary. Makes sense, due to I=V/R. Small res, big current&hellip;.. So just my recommendation, look for something that has at greater than 200mA rating. Anyone have an idea? </p>
If I want to put a switch, where should I put in it?
If you want a switch to turn on - off, you could solder it to the power jack. Hook ground to ground on the jack a 5 Volts on the jack to the other pole on the switch. <br>
Never mind, I used a breadboard and played around with different configurations. Leg 2 of pot to +9v, Leg 3 of pot to pin 7 of 555.
Yes, and also remember to attach Leg 1 with Leg 2 as we are not using any logical values.
Awesome instructable! This is my 3rd electronics project. My 1st was a simple LED, the second was a composite A/V mod and power switch repair on a Colecovision. I have a question about wiring the pots. The photos aren't clear, do you use legs 1 & 2 on the pots? I'm guessing the +9v goes to leg 1 and pin 7 on the 555 goes to leg 2. Is this correct?
Using two 555 timers is nice. Try using a single 556 if you can find one, it makes things a tad easier to wire up. (In my opinion.)<br><br>You can also use a CDS (photo resistor) instead of the variable resistors (knobs). Then you have a light controlled circuit. My students loved that.<br><br>Also, if you only have a single 555 chip you can always make a stripped down version of this. An ease project for those just starting out.
I will do a version with a 556, it was cheaper for me to get to 555. <br>Yep, I also tried it with some CDS, really cool. You get a nice atari theremin console!
Nice tutorial! I had a go myself but used a 556 instead. I found changing the capacitors can really change the tone! <br> <br>www.myredhotcar.co.uk/blogg/?p=248 <br> <br>@myredhotcar
nlatocha, Can you tell me more about how you changed the caps? Like using a 50uf instead of a 10uf or what? I am very new at this, so any help will be appreciated!
@synthdust - I basically added sockets where the capacitors were and tried different values to get different sounds. Take a look at this image and the next one:<br> <br> <a href="http://www.myredhotcar.co.uk/blog/led-distortion-pedal/sony-dsc-3/" rel="nofollow">http://www.myredhotcar.co.uk/blog/led-distortion-pedal/sony-dsc-3/</a><br> <br> It was just a case trial and error to be honest!<br> <br> Nick<br>
Every tried hooking it up through a guitar effects pedal, like and echo or flanger? I did. It sounds awesome! Check out http://youtu.be/ASVqshn26fk and http://ataripunkconsole.com/
Thanks, actually Im just working on a pedal. I have a distortion effect box that works quite nicely with this.
How much would you say it costs to make one? I know I could look up each part but I'm in no rush :) Please let me know! Super rad by the way!
Sorry for the late reply. I'd say about less than 10 dollars, already including the box and the 9v. Actually the 9v is the most expensive thing if you aren't using another power source.
Awesome. I will let you know how my APC comes out when I make it. Just waiting for the parts :)
What voltage does the console operate on?
On 9Volts. You can use a 9V jack or a simple 9V with it's connecter.
I have done in 2 times and I dont get any sound, only mi 555 chips get really hot and I dont know why. <br>I am a beginner in this stuff, There's some pics, let me know whats is wrong please.
Hi! Sorry for the late reply. Well from the looks I really cant tell what is wrong. You should try changing the green capacitors for ceramic capacitors. What I do recommend is using a bigger board or even a breadboard before soldering. A breadboard costs next to nothing and is a really great way for prototyping and checking what is wrong without soldering. <br>If you need any more help please don't doubt to write. :)
No problem. I would try what you suggested. And I'm gonna get a breadboard the better. <br>Thanks for the reply.
would it still work if I tried hooking up a MP3 instead of a 9V battery?
I don't know, probably not because it needs voltage being sent.
Where do you get those 555 timers? Would I be able to salvage them from stuff around the house?
555 timers are recent chips, I think the best thing is to buy them or buy a 556. They are cheap. Look at this:<br>https://www.instructables.com/answers/Where-can-i-find-scavenge-a-555-timer-and-others/