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.
The circuit shown in the figure can be used to connect a loudspeaker to an amplifier only after...
The figure shows how to add a protection circuit to a 7812 regulator with increased current. The...
We found this code switch circuit in the January 1999 Electronics Now magazine. Some of the...