This circuit of a 1964 Electronic Design uses a photodiode from the time. Modern equivalent can be used. The standby current is 1.2 mA.
This circuit was found in the November 1992 issue of Radio Electronics magazine. The circuit has...
This 70 kHz oscillator is used to erase tapes in pre-recording. The circuit is from 1968 General...
This circuit is from a 1977 National Semiconductor manual. The circuit directly indicates the...