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.
We found this circuit in a 2005 documentation. The circuit uses an infrared piezo sensor...
This circuit was found in a 1995 documentation. It deactivates a power supply in the event of a...
This circuit was found in the September 1993 Electronics Now magazine. It is based on the 555 and...