We found this circuit in the March 1980 Radio Electronics magazine. The circuit used is the HA2400 released at the time. The power supply must be symmetrical.
This simple stage can operate with low frequency signals (audio), driving a small lodspeaker....
This circuit can be used as a shield for touch control. The circuit can use any common FET like...
In the figure we show a monostable that uses two of the four ports available on 4001. The duration of...