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 TTL circuit found in the September 1996 issue of Electronics Now magazine doubles the...
This key is turned off by a touch sensor. The time it remains active depends on capacitor Cx. The...
This circuit is from a 1967 publication and applies to incandescent lamps up to 600 W. Triacs must be...