Tools, Tones and Toys for Guitarists
Here is a layout of an early version of D-120 OD. It is basically a J FET conversion of a Matamp GT120 with some interesting tweaks like diodes connected to the sources for some of the transistors. It also have a clean blend /summing amp circuit. The original had fixed resistors across drain and V … Read more
Based on Boss ODB-3 but with lots of added controls and switches! Schematic and BOM at OSH Park.
Here is a heavy beast from Dunwich, traced by Vince69 over at FSB.
Schematic and BOM avaiable at OSH Park. Looks like a very interesting Matamp/Orange amp emulator running mostly at almost 36v with an active speaker simulator(?) and a “Mode” switch for two tonestacks. Each being at different locations in the circuit.
Another take by Dunwich Amplification on the mighty HM2 circuit. Just released as a DIY project at OSH Park it has some tweaks all along the circuit compared to the stock Boss schematic. It also has a built in active clean blend circuit and switches for both hard and soft clipping diodes. Schematic and BOM … Read more
Here we have a “little” monster layout for a DIY project that Dunwich Amplification just released at OSH Park. It is supposed to a emulate a part Al Cisneros of Sleep bass rig. It is basically three circuits in parallell, a DOD 250 Pre Amp, a Boss DS1 and a clean J FET boost with … Read more
This one shares almost the same footprint as the earlier “Big Box” version but component values have been changed all across the circuit. No major changes except for the “bass boost” cap/resistor at the Cut switch and a few extra caps and resistors. Schematic is avaiable at FSB.
A bit hesistant to upload this one since there is an unknown cap value and pot value. But a quite a few people have requested this one so I guess a 95% accurate trace is ok? Traced by evilarsen, AlexS and myself. It is a Rat based circuit running on 9v/-9v up to 18v/-18v. It … Read more
Update 2 210514 Both schematic and layout is now corrected. A big thank you to Vince who traced the later 125b version which revealed how the active Mid control really works. Update 1 210514 Caution! There was a mistake in the trace. The Mid control have a different setup than the schematic and … Read more
Traced by AlexS and Fuzzhead, this is a quite tweakable and heavily modified HM2 variant with more gain on tap, more volume, two on/off/on diode switches and a very flexible four band eq. It is a quite noisy beast when Gain and all eq controls is maxed out though but a buffer up front helps … Read more