Telephone dialer (CB8521E)

Using an integrated circuit from the time, we found this configuration in a 90s Radio Electronics.

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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...