Friday, May 5, 2017
Hornby Skewes Zonk Machine II
The Zonk Machine II was the more budget friendly version of the Zonk Machine. It was a simplified circuit and featured silicon transistors in place of germanium. Originals used 2N4061 PNP silicons, but other could be used. Because it's silicon based, it shouldn't be too hard to make the swap to NPNs so it can be daisy chained with other negative ground effects. I've laid out 2 versions of this, one for BCE pinout transistors (like the original 2N4061s) and one for CBE pinout transistors. The perf layouts reflects the original positive ground configuration, and the PCB layouts reflect negative ground configuration. Note that the 3.9k resistor isn't always necessary (it's there to make the Fuzz pot value 2k). Here's the schematic for reference.
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EBC layout verified with negative ground.
ReplyDeleteUsed 2N2222's for the transistors and flipped all polarized components 180 degrees.
It doesn't get much above unity volume even with the gain and volume controls maxed.
I tried a 68K resistor in place of the 2M2 on the output, which increased volume but also added lots of idling noise and a weird gating effect.
It's a decent fuzz, but probably not a keeper for me.
I have a small request: Apparently there has been a Zonk II Germanium version made by both Hornby Skewes and Sola Sound. The schematic is quite similar to the silicon Zonk II which is why i was wondering if you could make a layout for the Germanium Version too.
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