Saturday, 22 November 2025

Jürgen Haible Wasp CV Filter LM13700 version

 Chris Stelloh have been playing around with Jürgen Haible Wasp CV Filter and sent me two verified layouts..

In hi sown words:

 I had a chance to build up that LM13700 version of the Wasp Filter and found that using a much different value of potentiometer for the cutoff control made for a better filter sweep.

This one is also verified. It contains a level pot that cuts or boosts the CV level. The oscillation switch implements the modifications that people have come up with for the Doepfer A-124 - which is a module that is basically a wasp. Albeit with some minor part value changes, as well as a HEAVILY modified CV and frequency/cutoff section.


 

 

Friday, 1 August 2025

Animals Pedal Major Overdrive

 Schematic is avaiable HERE.


 

SiB! Electronics Mr Echo Delay

 Another trace, layout and verification by Jordan Fontaine. A PT2399 based delay but it has a trick upon its sleeve that I haven't seen elsewere, the Slam switch.

 Schematic is avaiable HERE.