Low frequency clocks (CB9320E)

These circuits were obtained in an Electronics Now from the 90s. The integrated circuits are from that time and the power can be between 1.5 and 2 V.

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OR function with Relay (CB19773E)
The figure shows how to implement an OR function with two inputs, using a relay. The relay...
15 W Amplifier using theTDA7204 (CB3832E)
The integrated circuit used in this 1987 project is not very common these days. However, if found...
Comparator with feedback (CB9579E)
Found in American documentation from the 1980s, this circuit has a diode feedback. At the exit we...