We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the time and the diodes in the dotted board must be mounted on the output transistor heatsinks.
Found in a 2005 Linear Technology application manual, this circuit provides outputs from a current...
This circuit appears in other articles and suggestions for circuits in this section from other...
The phototransistor of this alarm can be of any type. The relay must be sensitive type according...