Voltage Follower TL081 (CB15308E)

This conventional circuit is from Motorola's 1993 Linear Interface ICs. The power source must be symmetrical.

1000 second timer (CB12768E)
The existence of field effect transistors at the input of the integrated circuit (operational...
Automatic Telephone Recorder (CB5992E)
This circuit turns on an old cassette recorder when the telephone rings, thus enabling the...
Crystal variable oscillator (CB9506E)
Found in Radio Electronics from the 90s, this circuit can vary the frequency in small values...