Common gate stage (CB7470E)

This circuit for FET was obtained from a 1977 Radio Handbook. The input impedance is 150 ohm. The output is high impedance.

Tuned optical sensor (CB7246E)
This 1967 Philips circuit recognizes a light signal (visible or infrared) modulated by tone. The...
Automatic Telephone Recorder (CB5992E)
This circuit turns on an old cassette recorder when the telephone rings, thus enabling the...
Power Grid Data Receiver (CB4810E)
This is the receiver for the previous circuit transmitter. Similarly, no information about the...