roughrider Posted April 7, 2010 Report Share Posted April 7, 2010 Hero,Although the circuit will work the way it is, with a zener of 39volts, isn't the attached what you really want? Quote Link to comment Share on other sites More sharing options...
Hero999 Posted April 8, 2010 Author Report Share Posted April 8, 2010 PictMaster,That does seem odd that the voltage shot up so high when the current limit was increased.Did it go back down to 12V or did it stay at 22V?roughrider,Tha't's not what I intended, although it will work.The zener was never intented to be a regulated voltage source, it's just there to ensure that the voltage to the op-amp never exceeds 39V.It might be better that way because the supply to the op-amp will be more stable. Quote Link to comment Share on other sites More sharing options...
PicMaster Posted April 10, 2010 Report Share Posted April 10, 2010 It stayed at 22V, what I shall do is move the zener diode like drawing above, and investigate more when I get some spare time Quote Link to comment Share on other sites More sharing options...
Hero999 Posted April 13, 2010 Author Report Share Posted April 13, 2010 You could try that, I don't know what could be going wrong, it sounds like one of the op-amps is latching up. Quote Link to comment Share on other sites More sharing options...
PicMaster Posted April 29, 2010 Report Share Posted April 29, 2010 Hopefully with a bank holiday here I might get chance to have a look, I shall have a run over the PCB with a scope when the voltage shoot's up and see why the R20 is messing around with the current, I know it should not but it does I can get upto 8amps by messing around with that.I have checked my schematic against yoour and to me it's correct, Can you just double check it got me jsut incase it's wrong thanksmosffet_power_supply.pdf Quote Link to comment Share on other sites More sharing options...
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