Balanced modulator (CB7927E)

We found this circuit in a 1968 Hughes publication. The components are from the era and can be replaced by modern equivalents.

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Battery discharge indicator (CB9549E)
This circuit is based on an operational window comparator. We found it in a documentation from the...
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This photo-relay uses a Darlington stage to increase sensivity. Any photo-transistor can be used....
35 W Amplifier (CB17021E)
This transistor amplifier provides 35 W of power to an 8 ohms speaker and must be powered by a 59...