This circuit is from a 1980s Motorola documentation. The circuit can be set to fire from 60 to 120 V DC or from 42 to 84 V AC. The circuit has a forehead button that activates an indicator lamp.
This circuit was found the Optoelectronics Sourcebook by Texas Instruments. Any phototransistor...
Applying an operational of the time, this circuit of an old documentation can be elaborated with modern...
This circuit appears on the site in several variations depending on the source. This is from a...