Telephone dialer (CB8521E)

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

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Nanoammeter (CB9662E)
This circuit for measuring very low currents was found in an American documentation from the...
Photoelectric switch (CB6857E)
This light-activated switch triggers a 6 V relay. The circuit can operate with 12 V and relays for...
15 V x 1A Protected Power Supply (CB17073E)
In the event of a short in the output, the relay disarms interrupting the supply. To reset this...