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 alarm is either activated or triggered after a certain amount of time, giving the owner time...
This circuit generates signals that depend on resistors and capacitor, producing a tone in a...
We found this circuit in an old French documentation. The transistor used is uncommon today and...