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.