Precision half wave rectifier (CB8240E)

Obtained in a 90s Radio Electronics, this configuration appears with variations in other points of this site. The power supply must be symmetrical.

Constant Current Source (CB1226E)
This constant current source from a 1980 publication can be used on a battery charger. Transistor Q1 may...
Power Outage Alarm (CB5952E)
We found this circuit very simple in an old documentation. The relay is high voltage sensitive, but...
Phase Shift Oscillator (CB25642E)
The network formed by resistors and capacitors determines the frequency of this sinusoidal...