Found in an old Radio Electronics, this circuit uses current components, used to rectify AC signals. The power supply must be symmetrical.
This monostable is triggered by the falling edge of the input signal, just adding an inverter...
This amplifier can be powered with voltages from 9 to 14 V providing 7W of maximum power under a 8 ohms...
This circuit is from 1972 documentation. The circuit detects when the voltage input is in the...