This circuit was found in documentation from the 1980s. The circuit uses several components of the time, which are uncommon today. We must not supply it with a transformerless power supply.
With this circuit it is possible to use a special output for some car alarms that allows to turn...
This is a higher current version of the previous circuit, obtained in recent English...
This circuit used in instrumentation is suggested by National Semiconductor, now Texas Instruments and...