This switched power supply was found in a 70s documentation. The basic components are from that time. The circuit operates at 200 kHz and has a ripple below 200 mV.
We found this transistorized circuit in a 1985 documentation. The circuit can operate with...
We found this small audio amplifier in the November 1999 issue of Electronics Now magazine. The...
This low power circuit for the FM band was found in a spy book from the 90s. The tunnel diode is...