Hydrophone preamplifier (CB21486E)

This circuit was found in old American documentation. It has 40 dB gain between 10 Hz and 10 kHz. Modern equivalent transistors can be used.

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Voltage Controlled Current Regulator I (CB19943E)
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Multiple Alarm (CB20628E)
We found this circuit in a 1985 technical publication. The circuit uses PUTs to drive lamps....
Zero crossing detector (CB20624E)
This type of circuit, found in American documentation from the 1980s, triggers producing output...