Voltage Follower TL081 (CB15308E)

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

Triac control (CB7854E)
This circuit of an Electronics Hobbyists Handbook uses a different configuration for a triac. The...
Square triangular VCO LM3600 (CB25153E)
We found this circuit in the July 1988 Radio Electronics magazine. The frequencies are given by...
Audible pulse analyzer (CB7139E)
Found in an English documentation from the 90's, this circuit makes slow logical pulses audible,...