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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Biasing Current Compensation Integrator (CB14086E)
We found this circuit in the Linear Applications Handbook of the National Semiconductor of 1994....
AC to DC Converter with DVM Module (CB25223E)
This circuit was found in the September 1989 issue of Radio Electronics magazine. The circuit uses...
Experimental Neon Siren (CB11942E)
This modulated siren has frequency adjustment and modulation in the trimpots. For 220V use 1N4007 as...