Steam locomotive (T315E)

This 1967 modeling circuit mimics the whistle of a locomotive. The steam-shrieking wheezing is set in a 2k2 potentiometer.

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High Power LED Modulator (CB847E)
This circuit is suggested by Texas Instruments in his Optoelectronics Sourcebook. The transistors...
Ultra Precise Delay Circuit (CB5152E)
This circuit is from an 80's American documentation. The circuit uses components of the time which...
Heads and Tails (CB4539E)
I found this simple circuit from an English magazine from 1984. The circuit can be easily...