Locked relay shield (CB8837E)

This interesting configuration was found in a 1965s Electronic Design. It makes use of components of the time.

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Capacimeter (CB4472E)
This circuit is suitable for testing motor starting capacitors. Capacitors from 2 to 8 uF are...
5 W Amplifier (CB6203E)
This circuit was found in Motorola documentation from 1968. The transistors are from the company,...
Balanced Mixer using an Integrated Circuit (CB4238E)
We find this circuit in a 1980s documentation. The circuit is for SSB modulation and the...