Interval for wiper (CB22113E)

This windshield wiper interval was found in an old documentation. The SCR can be the C106 and the transistor a BC548.

Simple Audio Oscillator (CB18537E)
This oscillator from an old publication uses one of the first commercial transistors, the CK722....
Comparator for TTL (CB20142E)
The integrated circuit used in this configuration is not common today. The zener determines the...
Battery Charger as Power Source (CB11529E)
With good filtration, a battery charger can be used as a power source. The filter shock can be the...