Monday, January 17, 2011

Piezo pickup preamp

This Mongrel Dog Audio piezo pickup preamp was built to preamp a piezo pickup in the bridge of a double bass. It has a 10M ohm input impedance and a single 2SK170 jFET. A PIO Russian military cap and two polypropylene caps add quality components to an excellent build.

The case is polished die-cast AL with a polyurethane coating and all is powered by a single 9V battery. I increased the storage cap to a 200uf low ESR variety. Tough , simple and good looking.

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