Found in documentation from the 1980s, this circuit can have several adaptations to use modern transistors and LEDs instead of the lamp. The power supply voltage can also be changed.
Rechargeable Nicad batteries type AA, C or D can be recharged with this circuit, which is nothing...
The figure circuit is a modulated tone generator, with the effect of interval beeps. The frequency of...
This circuit, very traditional, was found in a practical Elettronica of 1977. The source cannot be of...