Phototransistor Optical Ttrigger (CB14648E)

This configuration was found in the Texas Instruments optoelectronics manual. PNP transistors support equivalents and the phot transistor does.

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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,...