Friday 9 October 2020

PE-12 Elektronika Venta Overdrive

 An old Soviet overdrive/distortion with some interesting features. The layout is  modified and modernized to use three dual 8 pin op amps instead of 14 pin single op amps that was used in the original pedal.


 

 

 


9 comments:

  1. Hi. I am interested in this and would like to make it happen.
    In the diagram you posted, (and in which i cannot visualize the value),there are a resistor and a capacitor from Vref to Ic1.

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    1. Yeah, it isn't easy to see, had to enlarge and filter the image in Gimp. The resistor is 4,7k and the cap label "0,68 25V".

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  2. Hi.The 33k (L-20) resistor has to connect to PIN2-IC2.Between 1k (A2-5) and 220n (A6-C6) there is a resistor of 100k to ground.It as a great fuzzy sound.

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    1. Ah, I see. Will make these changes in a couple of days. Thanks for giving this one a try.

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  3. Hi.Thank you.After these changes,you can declare it verified.

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    1. Great! layout is now updated with corrected connection for the 33k resistor and added 100k resistor to ground before the output.

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  4. This thing sounds great! The EQ knobs take a bit of getting used to but there are a LOT of sounds in this thing.
    I'll note: comparing this to the real thing, the Resonance wiring is backward (F1 should be Resonance 3, E21 should be Resonance 1+2). PCB Guitar Mania has it backwards, too. It does kinda make sense - like a Rat filter knob - but is much more intuitive reversed (also that's how it's done on the original). Especially when using sliders.

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  5. Would you be willing to share the modernized schematic?

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