This circuit has more power than the previous one, since it includes a powerful transistorized stage. The circuit is from Radio Electronics from July 1985. It includes the power supply.
This circuit was obtained in a 1980 edition of Elementary Electronics a magazine that no longer...
Found in a 1969 Ferranti documentation, this circuit uses only bipolar transistors from that time....
The circuit shown is from Texas Instruments optoelectronics documentation. The input signal is...