Found in a Motorola documentation from the 70s, this circuit makes use of transistors of the time. Modern equivalents can be used. The diode also supports an equivalent.
The audio amplifier presented can use speakers from 8 to 16 ohms, with a power supply from 4.5 to 15...
Found in a Popular Electronics from the 9s, this circuit has output for RS-232 interfaces and current...
September 2016 - can already be found at Mouser Electronics new integrated circuit from Texas...