This circuit with zener diodes was found in documentation from the 90s. The zener diodes determine the lighting point of the LEDs. The circuit is for 12 V automotive batteries.
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...