Electronics > Beginners

DIY 0-30V 0-3A ...Again

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xavier60:
Is the -5V ok?

m3vuv:
in a word yes,well i actualy measure 5.1v,forgot to say i have used MC34071 ops

xavier60:
What are the voltages on the inputs and output of the CC op-amp while in the fault condition.
Also the voltage across the CS resistor.

m3vuv:
what do you mean by the fault condition?,it just doesent limit current,if i adjust the current pot ,the output drops to zero when the cc led lights,if i adjust it so its off i get output but it will supply max power regardles of the current pot setting.

xavier60:
Check the voltage range on pin 3 of the CC op-amp. The CC Pot should smoothly vary it from near zero to about 1.5V
The voltage on pin 3 should decease with increasing load current, by about 0.5V/amp. Pin 2 should always be zero volts.
The power supply is supposed to go into CC mode when pin 3 drops to zero volts.
Use the negative output terminal as the reference for all measurements.

Im looking at the schematic in Reply #42

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