Applause Super Distortion Schematic  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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Manfred
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Post by Manfred »

Found the Schematic by tracing.
The tone control (WAVE) is unusual.
Applause Super Distortion Top View.jpg
Applause Super Distortion Layout.JPG
Applause Super Distortion wiring.jpg
Applause Super Distortion Signal.jpg
Applause Super Distortion Switching.jpg
The series connection of the two Z-diodes across IC2a has no effect, because the threshold voltage of about +/- 6.1 volts at 9 volts supply voltage can never be reached.
5V6 anti seriel.jpg

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Ichabod_Crane
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Post by Ichabod_Crane »

To see the effect of the Wave control I emulated the schematic with a software. I omitted the bypass part connected on the CD4007UB (R2, C6...).
There's a problem. There's an big amount of low end frequency around 100Hz, but it's a pretty wide range.
I'm wondering if there's a mistake in the schematic.

I found just a video demo of a very similar pedal but branded KMD.

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Post by Manfred »

I'm wondering if there's a mistake in the schematic.
No, there is no mistake.
I made a rough PCB layout with SprintLayout and drew the schematic, using SprintLayout's tracing function.
After completing the schematic, I checked it by tracing it again with the layout.
ApplausPCB_clone.JPG
ApplausePCB_scan.jpg

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Post by Manfred »

I ran a circuit simulation of the filter section starting from the resistance R7.
Frequency Response Applause Superdistortion Filter Circuit.jpg

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Post by Ichabod_Crane »

Yes, I meant exactly that.
Maybe the pedal sounds fine though the frequency appears graphically unbalanced.

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