Zapper gain mod

Dan M

Well-known member
I think yes. If I’m doing this correctly, the gain across IC2 is (1+50k/1k) = 6.

If you increase the pot it would be (1+250k/1k) = 26.

But I think the diodes will lessen the impact. Maybe someone else will chime in on that part.

Feral Feline

Well-known member
The diodes will add op-amp clipping kind of like on a tube screamer, as opposed to straight to ground — It does go to ground, looking at the schematic, but the clipping hits R7 & C5 before ground... so, yeah.

Diodes'll lessen the impact but I think the gains made by the 250k pot will counter any loss. I'll let somebody else do the math and see if that's an accurate assessment.

What diodes were used?


Well-known member
Couldn’t tell you the math, this was awhile ago haha. I used 5817s. It just adds a bit of grit, nothing spectacular but I like it a lot.