Found in a 90s documentation, this circuit makes use of D1, a switching diode that is uncommon today. D3 is an LED. The circuit monitors 12 V batteries.
This circuit, obtained from an Argentine publication in the 1960s, used a German transistor in its...
This circuit generates a 5V rectangular signal. The circuit is suitable for calibrating TTL...
The sensor of this circuit is an NTC and the indication is made on a common analog indicator, and...