This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Monday, May 30, 2016

Four Step Atari Punk Console

I thought I'd mix things up a little this week and post some synth circuits people might be interested in. To start things out, here's a modified version of the classic Atari Punk Console. This has a few additional potentiometers for more control and a more versatile version of this popular synth.


In the layout below note that VR stands for variable resistor as the schematic I laid this out from didn't have names for each control (there are 6, labeled A through F).



Pardon all the jumpers, 555s are uncooperative for single sided layouts. Haha

35 comments:

  1. Replies
    1. Very cool projects!
      i don t understand good the connection for the beat led
      you can explain me better?
      thank you for share!

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  2. Hi! Do you happen to have any layouts for the wirings? x) Thanks!

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    1. Its pretty straight forward. Each VR is a pot. VR_A 1 would be pin one on pot VR_A. I don't think there is a pretty way to do this layout with all the off board controls. Just jump in head first and wire it up. I look forward to seeing your build.

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    2. Hi, thank you for your answer.. I've tried it and it works... but not all of the potentiometers seem to be working.
      On your layout, the VR_A for example, where it says: VR_A 2/3. is it pint 2 connected to pin 3 and both to the correspondent input / little hole?

      I appreciate your response. Thank you!

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    3. Yes, jumper lugs 2 and 3 on the pot with a wire, component cut off, whatever you prefer... Then run a wire from that connection to the 2/3 pad.

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  3. It works!! It's awesome. I'd loved it. Thanks! You've made my sunday!

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  4. Hello, is there a schematic for this layout? Thank you!

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    1. Schematic: http://drebot.uk.to/content/bin/4stepapc.png

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    2. YEp i want schematic too. Can someone repair the link?

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    3. Few years later...
      https://web.archive.org/web/20150803053116/http://drebot.uk.to/content/bin/4stepapc.png

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  5. hey, build this and boxed, added cv in, can't stop to mess with..
    thanks for the layout~ share shot clips here:
    https://www.youtube.com/watch?v=e8B7ffXzWuk&feature=youtu.be

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    1. Thanks boss~ one more short clips share: https://www.youtube.com/watch?v=t5WTIq_JIRg&feature=youtu.be ,enjoy~

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    2. Hi, where did you add the cv in on the layout?

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    3. yeah! it would be great to have cv in :) thanks for the awesome layouts

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  6. I got this working, my only complaint is that the frequency pot only seems to have about 25% of usable frequency as I turn it before it becomes a low grumble that has no different sounds from the other pots. Any tips?

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    1. You could try using a lower value pot and probably a log/audio taper pot.

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  7. hey
    what should be the value for the pots?
    thanks

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  8. i´ve made a video on how to wire the potenciometers on this project. It is in spanish though. I hope you like it.
    https://youtu.be/Y0FB5yMeiXM

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    1. i have also designed a PCB to avoid all the wiring on this project. You can connect both pcb´s with header pins and some jumper wire as shown on the picture attached on link below

      https://github.com/akemies/Four-Step-APC-control-PCB

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  9. Can i get a schematic on this layout?

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  10. https://web.archive.org/web/20150803053116/http://drebot.uk.to/content/bin/4stepapc.png

    you can find the schematic here

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  11. Hola, tenia una duda,acabo de terminar el circuito y quero saber el valor de los potenciometros del sequenciador

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  12. Porque el pin 8 que es la tierra no está conectado?

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  13. Hi,

    A few questions:

    what is the output level? line-instrument-headphone?
    What value for the pots is advised?
    Changing the diodes for LED's is ok?

    thanks
    btw, great circuit.

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  14. one last question, if I would make 2 of these and let them run in sync to create a polyphonic sound.
    My guess is to make one of them master and send the timing pulse from 1 APC to the other at pin 14 of the 4017IC.
    Am I correct?

    In order to make it 8 step, I should bridge pin 9 and 15 and double the "tone" citcuits?

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