Yes this may be modified as panic told for use with the 24VDC available in all instrument contol and marshalling cabinets..panic mode said:I like it. Note that 1k resistor should be 1Watt and the 1k pot
should be wirewound. It would be better to use PNP circuit so
that separate power source is only optional instead of required
(just about all electrical cabinets are already equiped with 24VDC
power supply, so you only need pair of aligators).