Phase detector (CB8155E)

This circuit was found in a 1967 Electronic Design. The FET is from that time. Capacitor C is determined by the frequency of the signal worked.

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Alarm with NO and NC Sensors (CB4806E)
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This circuit is from the 2005 Linear Technology Application Manual. The circuit must be powered by 5...
5 W Darlington Amplifier (CB6177E)
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