Voltage Controlable Atari Punk Console
Intro: Voltage Controlable Atari Punk Console
A while ago, I decided that I wanted to build an analog modular synth. After doing some research, I found out that I didn't know all that much about analog audio electronics at all. So the best thing to do was to start from the very beginning and to build all kinds of simple oscillating circuits to get a grip on the basics.
When you google for simple oscillators, you inevitably come across the stepped tone generator aka the Atari Punk Console (APC). The circuit was first published in 1980 by Forrest M. Mims III and was later slightly altered and renamed Atari Punk Console by Kaustic Machines. They gave it that name because its sound resembles that of the old Atari video game consoles.
When I did build my first APC, I quickly discovered why it is so immensly popular. It is very cheap and easy to build and it produces a lot of weird and funky noises with very few parts.
The only thing that, imho, is missing in 90% of the available circuits online, is a way to add an external voltage control. It can be done by adding only two extra female Jack connectors to the two free pins on the 556 timer. WIth these two extra connectors, you can add an external oscillator, LFO,...
When you google for simple oscillators, you inevitably come across the stepped tone generator aka the Atari Punk Console (APC). The circuit was first published in 1980 by Forrest M. Mims III and was later slightly altered and renamed Atari Punk Console by Kaustic Machines. They gave it that name because its sound resembles that of the old Atari video game consoles.
When I did build my first APC, I quickly discovered why it is so immensly popular. It is very cheap and easy to build and it produces a lot of weird and funky noises with very few parts.
The only thing that, imho, is missing in 90% of the available circuits online, is a way to add an external voltage control. It can be done by adding only two extra female Jack connectors to the two free pins on the 556 timer. WIth these two extra connectors, you can add an external oscillator, LFO,...
STEP 1: What Do We Need for This Project?
- A 556 dual timer
- A 1K resistor
- An LED of your choice
- A resistor for the LED. In my case a 470Ohm
- A 100nF and 10nF capacitor
- A 10uF electrolytic capacitor
- 2 x 470K or 500K potentiometers
- A 100K Logaritmic potentiometer or a 100K and 4K7 resistor
- A switch
- 3 female jack connectors
- A DC connector
- A 9V powersource
- A case. I used a plain and ready available project box. But google for Atari punk console and be amazed about all the weird and wonderful housings for this device. I am sure that you can come up with one of your own.
STEP 2: The Circuit
The circuit is basically 99% the same as the original Forrest M. Mims III design, except for the 100K potentiometer that I added for volume controle. The LED and switch are optional.
For the voltage controlled bit, I just added a female jack to pin 3 and one to pin 11 of the 556 and that does the job.
Building the circuit is really easy and you should definately try to tweak it or to add your own bits. 556 ic's are really tough and can survive a lot of electronical abuse!
I added the eagle file of the board fot those who would like to use it. The board has 2 options for output: eIther a line level or a volumecontrol.
For the voltage controlled bit, I just added a female jack to pin 3 and one to pin 11 of the 556 and that does the job.
Building the circuit is really easy and you should definately try to tweak it or to add your own bits. 556 ic's are really tough and can survive a lot of electronical abuse!
I added the eagle file of the board fot those who would like to use it. The board has 2 options for output: eIther a line level or a volumecontrol.
- For line level: Add the 100K and 4.7K resistor and connect the rightmost pad and the centre pad of the potentiometer.
- For a volume control: Add a 100K potmeter and connect directly from the 10uF capacitor to the rightmost pin of the potentiometer.
33 Comments
yago r 6 years ago
Hello! Does anyone know how would it be the setup with two 555s instead? I've found many schemas with the potentiometers but Id like to add two VC jacks to the oscilator (not sacrifying the potentiometers). Any idea?
Tnx in advance!
Iregi 5 years ago
0600 6 years ago
Just a hand drawing I did for my self, as I had a bunch of 555's kicking about to use. Hopefully this helps everyone who doesn't want to grab a 556. Cheers!
JacksonC33 5 years ago
So I have built an APC very similar to this design, and have added the two CV Inputs. I have also been building a Baby8 8 step sequencer, and have been trying to run it through the APC to create a looping rhythm. For some reason, the sequencer does nothing to the APC. Has anyone attempted something similar and had problems with it?
JanD28 7 years ago
hello, i'm very new with electronics, i got the 556 timer but your drawing is with the two 555's
i'm a bit confused over how to connect everything to the 556..
thx in advance..
ColeP18 7 years ago
Thats Not 2 555's, its the 556 split into 2 parts. just follow the pin numbers.
janw 7 years ago
JanD28 7 years ago
thx man, gonna give it a go!!
Abstractauditory 8 years ago
EddO1 8 years ago
Why the two jacks for the CV input? Is it one for each oscillator?
janw 8 years ago
EddO1 8 years ago
Yours is the only design I've come across to do that. Very nice. Just one more question. Could the switch be a simple SPST toggle? As far as I can tell that's the function of it on the schematic. Or have I missed something?
janw 8 years ago
MoritzK1 8 years ago
So I made it. Actually it took me a while to figure out, that the ground on the schematic is supposed to be the negative pol of the power supply. Isn't ground and the negative pol a different thing?
Anyways, I think the idea of adding 2 CV is great. What types of cv can I add there?
I built the apc in a bigger wooden box, so I can place there some lfo, fx... or a sequencer, to have diretly a modular system connecting the apc in different ways
janw 8 years ago
oliver.schrecker 8 years ago
how would you go about connecting two consoles together?
janw 8 years ago
oliver.schrecker 8 years ago
skuishingbugs 11 years ago
janw 11 years ago