Band-Pass Filter (CB14921E)

This circuit was found in a Poptronics of the 90's. The components can be changed to the desired frequency. The power supply must be symmetrical.

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Shift register (CB9069E)
This transistorized shift register was found in a 1970s RCA documentation. The used transistors can...
Solar charger MC34064 (CB14537E)
The integrated circuit used in this charger is not very common today. The circuit is from...
Zener Diode Tester (CB22160E)
This zener test circuit was found in an English publication from 1989. The circuit tests zener up to...