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 American documentation from 1968, this circuit has an acute cut-off of the frequency to...
This low input impedance amplifier stage was found in a 1963 documentation. The circuit employs a...
We found this conventional sequencer configuration with the CMOS 4013 integrated circuit...