Electro Harmonix The Worm / Madbean Charlatan

EHX The Worm 8b9d1538ff9f

 A vintage big box The Worm with some useful improvemnts and mods by Madbean. The power section have been reworked by a voltage doubler and a voltage regulator for 9v to 15v operation. An internal volume trimpot is added. And the unknown original vactrols is replaced by a trio of LDR/LED pair. Schematic and more … Read more

Ross Phaser

Ross Phaser 434ea9db98c8

 Yes, Modulation Monday is back with the Ross Phaser. It’s not for the feint of heart, but doesn’t require any JFETs, matched or otherwise. Instead it uses OTAs with 3, LM13700N (one for the LFO, two for the audio path). Should fit nicely in a 125B with top mounted jacks. Schematic for reference.

MXR: Phase 90

MXR Phase 90 vero layout v1a 2ead714849c4

Bit of a classic guitar effect – the MXR Phase 90. Electrosmash has an excellent reference that covers all things Phase 90, including the schematic  https://www.electrosmash.com/mxr-phase90. JFETS can be pesky, so make sure you match them as best as possible and buy from reputable suppliers. The script switch is strictly optional.   It’s one of those things that … Read more