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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

HarmEn

Pedal Parts

New

£28.44 inc. tax

£23.70 ex. tax
? Tax based on United Kingdom.
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Customer Reviews

2 review(s) posted (write review)
One size fits all. 5 product stars
"Great little circuit! It works exactly as described and it imparts tones that all Zappa aficionados will recognise. It can work as an interesting alternative to 'yer common or garden overdrive and is sensitive to the controls on the guitar. Try running it into the "Dirt Dessert" (featured elsewhere on this site), gets REALLY funky!" Eddnix - 30 June 2020
Arf! 5 product stars
"Xmas present from the missus. A must have if you're a Zappa freak, or looking for a creativity unblocker. I modded mine to accommodate an external frequency control pedal (M g Ep3) that enables it to be used in a wah-like fashion. Yields quite a range of responses depending on placement in the pedal chain. Top quality pcb. Full marks." Mark Jeffery - 06 January 2018

Don't forget to download the 
General Build Guide

 

PRE-BUILT KITS:
We're only building for UK customers right now. Please don't order from elsewhere as we'll simply have to refund you.  

PLEASE NOTE:
Full kits DO NOT include enclosures unless you select them in the 'Kit Type' drop-down menu.