This is the commercial circuit for the TRF-44 amplifier sold in Japan in the 1960s. The circuit provides a few hundred milliwatts and is intended to be used as small, battery-powered turntables.
This circuit was found in an old GE manual. It uses a thermocouple as a sensor. The SCR must be in...
This circuit was found in the February 1997 Electronics Now magazine. The circuit has a power...
We found this circuit in an old American operational Amp. documentation. The circuit applies to...