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.
This circuit can be used on a 0 to 14 V source with a current of 1 A. The PNP power transistor can be the...
The presented circuit can use an equivalent transistor like the BC548. The configuration, which [is...
This sensitive three-transistor circuit was found in Electronics Now magazine and is...