Hi,
I need to build a LM 350 variable supply to deliver 0 to 24 volt at the output.
The standard circuits with R2 as the pot have a basic design problem in that the output voltage will jump to 24 volts should the wiper of the pot loose contact even momentarily.
I recall seeing a circuit configuration where the R1/R2 combination is modified, maybe another resistor added to prevent that situation - ie the output voltage will drop if the wiper of the pot looses contact.
Has anyone come across this on the Net?
I need to build a LM 350 variable supply to deliver 0 to 24 volt at the output.
The standard circuits with R2 as the pot have a basic design problem in that the output voltage will jump to 24 volts should the wiper of the pot loose contact even momentarily.
I recall seeing a circuit configuration where the R1/R2 combination is modified, maybe another resistor added to prevent that situation - ie the output voltage will drop if the wiper of the pot looses contact.
Has anyone come across this on the Net?