This circuit is from 1980s documentation. The maximum operating frequency is 3.5 MHz. The current of the LED can be from 0 to 100 mA. The integrated circuits used are from that time.
This circuit consists of two stages that each shift 180 degrees the signal. The circuit was...
This circuit was obtained from American documentation from the 1990s. The transformer can be a car...
This circuit is from an old English documentation. It uses a common milliammeter to indicate the...