A fairly rare old Boss eq pedal which is rarely cloned due to the dual 10kA/10kC Balance control. However, it is quite easy to make your own if you have a dual 10kA pot and a single 10kA pot on hand. Custom pot tuturial and schematic is avaiable HERE.
Slightly modified, subbing the two single op amps of the original to a dual. 1458 or 4558 should match the spec of the original ones.
Just traced by Aion Fx as their Ixuea project. This layout is slightly modified compared to the original pedal. First, stock units had a fixed low pass filter before the volume control. The resistor in the filter is now replaced by an external tone control. Secomd, it is wired for true bypass with the input buffer hardwired.
Ghost Effects take on the rare and elusive WEM Project V Fuzz. Compared to the original, some overkill filtering has been removed and Edge and Drive switches has been replaced with a tone control labelled Edge.
Information regarding mods and trimpot setup is avaiable HERE.
Can't believe I haven't posted this one yet since it is one of the better vintage big muffs I built and played. In the very early days EH, component values varied quite a lot so this layout is based on Kitraes schematic HERE. There is also some notes and info the component values.
Trannsistors is 2N5133 which is almost impossible to source nowadays. Some Big Muff owners have measured their transistors (out of circuit) and reported those varied quite a lot but most of them were in the 150-300 hfe range. 2N2222, 2N3904 or BC547B might be good candidates but a personal favorite is ME4003.
Here is two layouts, one standard and one "Triangle Style" mojo layout. Both are verified.
David A Mains take on a tonebender that should have been released before Tonebender Mk. 1...:-p
A modified layout for the old EHX Pulsar which is infamous for its LFO ticking bleedtrough. There is two mods that hopefully can solve it. First, an op amp input buffer and second the more common mod; separating the power with a small value resistor between the amplifier and the LFO section. LFO section also have its own power filter cap.
Great sounding chorus which is based on EHX Small Clone but with much more tweakability.
Note that the swithing board is not included for this layout so the voltage reference components (8,2k, 10k and 47uF) istaken from the switching board into this layout.
Schematic and info HERE
Layout for the first version of Small Stone which was produced between 1974(?) and 1978.
Layout is based on schematic from Lectric Fx
Note that original had long gone obsolete 8 pin OTA chips so this layout is modernized for easy to get LM13700s.
Aions Ares project which is based on Echoplex EP-3 Pre Amp which includes an onboard voltage doubler for more headroom. Schematic and info on J FET selection avaiable HERE.
'Note that there is two ground connections on the board, the purpose is to reduce any potential noise from the charge pump. Those wires can be connected to any off board ground points like your audio jacks and DC jack. I also replaced the Drain resistors with trimmers for fine tune the bias.
