Modulation
Electro Harmonix Small Stone V1
Layout for the first version of Small Stone which was produced between 1974(?) and 1978. Layout is based on schematic from Lectric Fx Note that original had long gone obsolete 8 pin OTA chips so this layout is modernized for easy to get LM13700s.
Jen KPS-900 Phase Shifter
Similar to MXR 45 phaser but the pesky J FETs is replaced by a CD4007 chip so no transistor matching is required. Schematic avaiable HERE
Dead Astronaut Faze Filter
Requested by Alltrax74, a phaser based on MXR Phase 90 with some bells and whistles. Schematic is avaiable HERE Note that the J FETs should be matched for best effect and CLR 1 value is 47k in the schematic but you could probably go lower if you not using a super bright LED
Maestro RM-1A Ring Modulator
A requested circuit but bear in mind that it is rather big, has an onboard charge pump for 15v-15v operation, and has a quite complicated setup due to five multiturn trimmers. I’ve omitted the (for now) the Osc, Pitch, Carrier and Modulation jacks but might add it later on if is requested but it will … Read more
1776 Effects Multiplex Jr.
Schematic and info HERE . Original calls for a VTL5C3 vactrol but since they are obsolete and stupidly expensive the layout calls for a home made vactrol. Just socket the LED and LDR to find the right combo.
Seppuku Fx Mind Warp
Schematic, trace and info avaiable at FSB. Note that there is a cap value missing across pin 11 and 12 at the PT2399. There is a 10nF cap across pin 9 and 10 so a close value to that should work. Also, lug pot numberings isn’t marked on iether of the schematics so lug numbering … Read more
