Telephone dialer (CB8521E)

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

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RF proximity sensor (CB8765E)
This capacitive sensor that operates with a high frequency oscillator was found in Radio...
Small Amplifier (CB969E)
This amplifier for the experimenter´s bench source 1 W and uses germanium transistors but can be...
Sound operated switch (CB9214E)
This circuit was found in a Hands On Electronics from the 90s. The microphone is a small 75-ohm...