This circuit with power MOSFETs was found in a 1980s Siliconix documentation. Equivalent MOSFETs can be used, as well as other transistors. Note the symmetric power supply.
This is one of the many versions we have of this alarm on our website. It was found in an English...
In the figure we have the simple way of controlling a load or having a signal from an optical...
Found in General Electric and 1967 documentation, this circuit automatically turns off the...