Schematic is avaiable HERE.
Dirtbox Layouts
Wednesday, 26 November 2025
Monday, 24 November 2025
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.
Saturday, 20 September 2025
Sunday, 14 September 2025
Monday, 1 September 2025
Sunday, 31 August 2025
Saturday, 30 August 2025
Friday, 29 August 2025
Friday, 1 August 2025
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.




















