This is a modified EP Booster circuit, built on an etched madbean PCB.
It can run on 18 volts from a 9 volt power supply, thanks to an internal charge pump. A trim pot inside let's you adjust the voltage, allowing more headroom, or conversely, more gain.
The toggle beefs up the sound, great for single coil pickups. The tone control is very useful throughout the range of the pot.
It's a great little preamp circuit. I've been using SHO circuits strictly because of their tube-like boost and transparency, but they can be shrill when you use the volume knob on the guitar to control gain.
Not so with the Zoso.
The enclosure was etched by me with ferric chloride, came out OK..... Kind of rustic......
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