Harmonic Energiser

One for the Zappa fans out there. Great filter circuit that can do a whole range of cocked wah and more. We'll leave it to the very excellent Joe Gore to enlighten:

"The (Harmonic Energiser) has a deceiptively simple set of three controls: gain, filter cutoff frequency, and filter bandwidth. At moderate settings, it yields an assortment of stationary wah sounds. But you can also dial in ultra-narrow, ultra-resonant filtering beyond the range of most wahs. And these edgy filters burst into overdrive in weird, unpredictable ways. User beware."

Yeah, what he said, except the FuzzDog incarnation gives you the option of an external volume control too, as tweaking the filter can alter the perceived output level.

This is one of those circuits with switch pop that just can't be eliminated. We've tried...

The kit is supplied with vertical-mount pots which have round shafts, so you'll need set-screw fitting knobs.

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.

Builds are only available with full kits including enclosure and vertical-mount pots. Please choose appropriate knobs.

Inspired by: Systech Harmonic Energizer

Difficulty: Medium

PCB size: 50 x 40mm

Knobs required: 3/4

Enclosure: 1590B

Direct-Connect compatible (4-way)

Download the INSTRUCTION PDF