Booster for preamplifier (CB6290E)

We found this circuit in a 1968 Electronics World. The circuit uses a transistor of the time providing a 16 dB signal gain with a 4 V output.

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Residential Alarm (CB17984E)
This alarm, found in a 2002 documentation, uses several sensors and has a 12 V supply, not...
Strobe (CB22221E)
This circuit uses a special 1950's RCA strobe tube. It can be built with equivalent components for the rest...
Digitally controlled attenuator (CB9029E)
This circuit, which can act as a shield, was found in a 1970s American documentation. The...