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  1. P

    Design new 0 to 30V power supply.

    I removed the 2 resistors and I did forget to say U5 as well It was the same if it running from U5 or the exteranl PSU set for 4.1V with common GND No when running off U5 The goes up and down due to the V-Ref voltage not been stable from the external PSU set for 4.1V I only get 2.6amps max I...
  2. P

    0-30V Stabilized Power Supply

    But looking at the schematic U3 if feed by +10V -1.3V supply if I'm looking at correct and U1,U3 are fed form the high plus side of power supply(41V), I was not sure if this would affect the operation of it if it all was in one chip which would maje a smaller neater design well I think so any way
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    0-30V Stabilized Power Supply

    Just a quick question Is there any reason why you could not use the quad vesrin of the TLE2141 instead of the three op-amps, Or would this have the effect the operation of U3 ?
  4. P

    Design new 0 to 30V power supply.

    Right I have done a bit more testing. I will try and explain the best I can. I found out where I went wrong, It was on the connections from the transformer(my fault). V-Ref I can only get 2.6V out of it. and the max output voltage was 23V. Also if I connected a load it went lower 2.1V. So here...
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    Design new 0 to 30V power supply.

    There must be ishall look into it and go over the rest of the pcb,I have just tested the v-ref 4.31v no load connected and both pots at 0 I turned the voltage to 10.v v-f ref went down to 2.8v I then placed a 1A load and with the current turned to max the v-ref semms to be jumping up and down,I...
  6. P

    Design new 0 to 30V power supply.

    It was R20 100K. I shall change it and start to carry out the tests above
  7. P

    Design new 0 to 30V power supply.

    Sorry what I meant is I shall carry out the test on M1 with a 1A load on it. Make sure M1 is off below 12V. Youre not boring me I'm finding this very interesting and learning lots more about power supplies. What I meant by it's been a long day at work (14hr shift) I love it when you get stuck...
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    Design new 0 to 30V power supply.

    Sorry it was a long day, It should have said is easy enough done. so it's a yes. OK it was just a thought that's all Yes I substituted a few resitors, Maplins did not have thevalues I wanted plus rather exspensive 16P each, Rip off or what. I searched through my bins for the correct value and...
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    Design new 0 to 30V power supply.

    I will try that and let you know. I thought that but if I remmember in the sim it does not do it. I know the sim to real world might not be the same. The only reason I asked becuase, A velleman PSU I had has a 47K & 1K pot for the voltage adjust, The 1K pot gives you a fine tune over 1V has...
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    Design new 0 to 30V power supply.

    Update, I have finally got it built and working, Well I have only tried the voltage through the full range from 0-30 volts, Partly tried the current draw test on it, at the moment I can't do a full current test due to the fact I have not got the 15mr resistor I only have a 0.1R which only draws...
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    Design new 0 to 30V power supply.

    Yes I know I was going to do that any way, I've decided to layout a PCB for it, Even though I know that the design is not complete or may not work, The reason I've gone down this route is this way as long as the schematic is correct the PCB will be correct and less chance of any man made errors...
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    Design new 0 to 30V power supply.

    I will make a start this afternoon on it, It will be built up on my bread board rig, Hopefully it will work has good has it does in the simulator, I will take some pics of the tests, I have no problems where you post them, I have a load tester where I can make the current variable from 0-10amps...
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    Design new 0 to 30V power supply.

    I have now obtained most of the parts for it so I'm ready to start building it, I've got the correct chip now  ;D. has anybody built it yet means this topic was disapearing off the list
  14. P

    Design new 0 to 30V power supply.

    I say I never saw it or if you did answer I may have asked before but it's been a few weeks and been to bed since then many times. I would only use the LM324 has a stand in for the trial; I thought it just be nice to see how it would perform in real life The next time I place an order I shall...
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    Design new 0 to 30V power supply.

    By all means feel free. The purpouse of this is below 15V we only use the one side of the transfomer and above we use the 30V side of the transformer, This prevents generating to much heat at low voltages Yes R5 is the current resitor, Many electronics suppliers should sell them I know Farnell...
  16. P

    Design new 0 to 30V power supply.

    Herro Could I use a different type of op-amp say a LM324 or some lm741's, I know that the higher input voltage would be no good, But has I have not got around to order the correct one yet, I was thinking using the above op-amps but only use a 15-18V transformer for the trial I know this will not...
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    Design new 0 to 30V power supply.

    Just to let you all know due to other commitments I will not be able to fully help in building and testing the power supply,  :( :(. I have to get this other project finished that I've been working on has they have brought the completion date forward :(. I will keep an eye on this topic and any...
  18. P

    Design new 0 to 30V power supply.

    Ok May be not max volts/amps setting so it cannot bed excceded but a amp setting reading so the use can see what the max curret is set rahter than geussing because if you set it to high and your PCB under testes have faults then bang ;D I've add a quick look at the parts list/schematics, I...
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    Design new 0 to 30V power supply.

    Oh no I see that we have lost 3 pages of the topic What's going wrong ? I no this is jumping the gun a little but I've been playing around with the Digital part well laying out the GLCD for volts and amps, I shall try the bigger fonts and aslo the standard font, If we use the standard font...
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    Design new 0 to 30V power supply.

    The MCU with LCD 6/8 push buttons and may be 2 digital pots I would say no more than 100-200MA may be well lower, I would say if you allowed a max of 500ma this should more than enough, I will look into it for a more accurate figure, but the 5V supply would need to be filtered well. I will try...
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