A mini pre-amp, which is designed to be used with micro-phones, but may be adapted for many other applications
EFK 12022 Electronic Thermostat
EFK 2002 Guitar Pre-Amp Tone Control
EFK 2003 Two Transistor Pre-Amplifier
EFK 2004 Three Transistor Pre-Amplifier
EFK 2005 Super Snooper Utility Pre-Amp
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