Slave flash trigger (CB8704E)

This circuit was found in a 90s Popular Electronics. The sensor can be any phototransistor.

Ground-Referenced Constant Current power Supply (CB25616E)
Unlike the previous circuit, this circuit from Electronics Now, October 1993, has the load...
Oscillator with voltage comparator (CB9050E)
For the component values used in thisf this circuit, the frequency can be adjusted between 740 Hz and...
Low Consumption Clinical Thermometer (CB14000E)
We found this circuit in the 1982 Selezione Radio magazine in Italy. The circuit uses an...