We found this circuit in a 1964 Electronic Design. It provides 0.5 V signals from 4 kHz subcarriers. Transistors are from the era.
Found in documentation from the 1980s, this circuit makes use of discrete components of the time....
To operate in a harmonic of the crystal frequency, tuned to a trimmer in the resonant circuit of...
The possibility of using the 4013 in the monostable configuration added to the input sensitivity of the...