Smart Charger (CB26305E)

This circuit was found in Radio Electronics magazine from the 90's. The circuit is for small NiCad batteries.

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TTL Oscillator (CB6150E)
This oscillator can generate 2 to 10 MHz signals and was found in an American 1980s documentation. The...
Power Flasher (CB18480E)
This flasher was originally intended for Christmas tree lamps. The circuit is from 1974 and uses...
Operational with Hysteresis LM309 (CB15103E)
In the figure we have the way to add hysteresis to an operational amplifier. The relationship...