MUSITRONICS™ MUTRON III™ RTS PCB

A ready-to-solder PCB for the Neutron, our replica of the Musitronics™ Mu-Tron III™ envelope filter, one of the best-known envelope filters ever made.

About the effect

The Mu-Tron III™ is the classic touch-sensitive auto-wah behind a lot of 1970s funk. Dig in and the filter sweeps open, play softly and it closes down. The Neutron design comes from the GEOFEX site. One heads-up: many of the optical (LED/LDR) units that worked well in this circuit are now obsolete, and we welcome suggestions for replacements so we can test and post them. If the charge pump whines, a jumper between pins 1 and 8 of the 7660 IC may stop it.

Specs

• PCB dimensions: 8.1cm by 4.8cm (labeled Neutron)
• Solder mask, plated-through holes and silkscreened component placement
• Jumpers are built into the top layer, so there are no jumpers to solder

Build resources

• Complete instructions for this PCB
• Bill of materials, schematic and parts layout and wiring diagram
• Wiring diagram for the schematic-impaired

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