This 18 V x 300 mA power supply was found in a 1969 documentation. The integrated circuit is difficult to obtain today.
This circuit for voltmeter has an output of 1 V for 100 uA having been suggested by American...
The operational amplifier used is a double 741. The power supply is symmetrical, and the gain is...
We found these circuits in a 90s Radio Electronics. In them, we have the way to turn a load on and...