This circuit is from a 1968 documentation using one of the first integrated circuits available at the time, the TAA370. The circuit is powered by 1.3 V using a 200 ohm handset.
Found in Popular Electronics from the 90s, this circuit can be used as a warning shield for...
This amplifier is from the 1990 Philips Databook. The integrated circuit must have a heatsink and...
The power supply shown below is used to supply continuous voltages between 3 and 12 V to small...