The Cardinal Harmonic Tremolo is a great tremolo by Jon Patton that is based on the harmonic tremolo effects found on certain Fender amps 1960-1964. "It’s an unusual, and beautiful, combination of mild phasing and amplitude modulation".
I decided to make a layout without the regular IC LFO and use the TAPLFO from Electric Druid insted (as suggested in the schematic). It was easier to make two separate board for the tremolo and LFO. The recommended vactrol VLT5C1 works best in this circuit. The 10K trimmers set the bias for the J201. Just turn them until it sounds good. :)
The TAPLFO board is just a slightly modified version of the stand alone board I did before. Read more about the required HEX code and PIC programmer in my earlier Tap Tremolo post or visit Electric Druid.
All the layouts are Verified unless noted.