Here’s another one. I’ve had a lot of emails for this one. The best way I can describe it is as an “enhancer” – it makes and already good overdrive tone better! It produces a great low overdrive, the compression and shimmer controls are very interactive with regard to both the gain/clipping structure and the overall tone and feel of the device..
This design was born from a challenge set to me and a few others by Bjorn of BJF effects to build a circuit that sounded like the honeybee. Soulsonic came up with a very elegant and simple design called the Hunny Bunny: http://www.soulsonicfx.com/?page_id=88 (I love that circuit). The Humming Bird De’luxe is what I came up with and you can see the schematic below.
Here’s a vero layout by Harald Sabro (http://www.sabrotone.com):
[NOTE] One of the capacitors is marked as 47k on the schematic – this should read 47n. Point B goes to the input of the mosfet stage.