Metal Simplex

A circuit that many a DIYer have cut their soldering teeth on.

Howie's Metal Simplex looks like a fuzz, builds like a fuzz, but gives some awesome straight-up rock dirt.

The original design calls for specific hFE ranges for the BJTs, which we'll supply for you. But honestly it just works, so if you're sourcing your own don't sweat it.

If you want the PCB without parts there's a link for that at the bottom of the page.

Partial kit: PCB, all board-mounted components, pots.

Full kit: As above, plus footswitch and appropriate daughterboard/components for your selected bypass type (see Downloads section for details of those), jack sockets, DC socket, battery snap, hook-up wire, LED.

Enclosure (pre-drilled) is available as an option with full kits, and will not take a battery. Knobs are not included.

Inspired by: Metal Simplex

Difficulty: Medium

PCB size: 50 x 20mm

Knobs required: 3

Enclosure: 1590B

Direct-Connect compatible (4-way)

Download the INSTRUCTION PDF