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    0-30V Stabilized Power Supply

    Here is the working version on my PSU, There is just just a couple of minor things I have got to look into and clarify. Yes the connecting wires may look a little on the light side but this is for testing only Has I only took to 3amps and calibrated max current for a few seconds to try. These...
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    0-30V Stabilized Power Supply

    I've got it 3/4 built, I missed some parts off and by the time I thought about it Maplins was closed. will try and get them tomorrow (Monday) then I will be ready for testing and if all goes well I will upload  the pcb picmaster
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    0-30V Stabilized Power Supply

    This is the connections drawing for my version of the power supply and updated schematic, To me it looks quite simple This is the actual size of the PCB and what the layout looks like. The next thing is to update the component values on the schematic and create BOM Hopefully over the weekend I...
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    0-30V Stabilized Power Supply

    This is only the schematic I have a drawing explaining all the connections in detail, I t will be simple to follow, I'll upload the details in a short while Picmaster
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    0-30V Stabilized Power Supply

    Thanks for that, I did for get to add the resistor to the BD139, The reason is I had the idea of having the BD139 and the ouput transistors and the emitteres resistors on a seperate board so they can bolt direct to the main heathisnk rather than have 2 heatsinks for them. I wll sort that out...
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    0-30V Stabilized Power Supply

    Hi all I have redrawn the schematic again and I've managed to find some time and finial got round to lay out a single side PCB 75mm X 100mm, Now I have checked the schematic over and for checking and checking it over I'm 99% sure it is correct and can't see anything for looking, I'm ready for...
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    HEX file for project

    You could have a look here  ;D, I think it's based on the same circuit but the all the information is free and you can obtain all the files you need to build it. I would say there is  infringement on copyrights hs all the info is published on his web site...
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    lm 723 dual tracking Lab PSU

    Here is a single version which you can make a dual tracking psu http://www.velleman.eu/downloads/0/manual_k7200.pdf
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    Design new 0 to 30V power supply.

    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...
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    Design new 0 to 30V power supply.

    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
  11. P

    Design new 0 to 30V power supply.

    I have done a bit more playing and something is not right, When I adjust R20 the amps do adjust I know you said it should not. The other thing I noticed instead of using a resistor has a load I used a 12V fan I set the voltage to 12.56V the fans runs OK then if I turn down the current pot to the...
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    data logger system

    This is quite simple to do, use your friend called Google  ;D There are plenty in the net
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    Design new 0 to 30V power supply.

    Hero Can you explain a little how the current limit side of thigs work and about the role of R20 just has so I cna get a better understanding of how the circuit works cheers
  14. P

    Design new 0 to 30V power supply.

    This was before I changed the resistors to 82K&10K with a 0.1R shunt, The max current is 4.36Amps and altering tR20 does not effect the current readings now but I thought the output voltage was limited to 32V but I get 35V. Is this correct ? I will investigate some more but can't understand...
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    Design new 0 to 30V power supply.

    I changed the resitor values to 82K&10K this give me a max current of 4.36A Not sure if it is me me, Put when I alter R20 the current does not seem stable and I get higher amps out put. I have got R20 set about half way current pot set near minimum voltge set to 15V then when I switxh on a...
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    Design new 0 to 30V power supply.

    I did have a 3k & 160k but with a .1R restor the current has you was low now I have stll got the 160k and a 22k but judging what you said a 82k &10k should be better with the .1R so if The voltage was set to 5v darwing say 10mA I still should be able to alter the voltages before the...
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    Design new 0 to 30V power supply.

    What is the lowest current you cna set it to ? My V-Ref is 4.05V and the maxium voltage is 35V. The lowest current I can go to is 123MA, The center tap of the curent pot reads 103MV This enables the ouput to go to 35V, If I set it the center of the pot reads 33MV the max out I can only obtain...
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    Design new 0 to 30V power supply.

    I realised that after I typed it. The reason why the current was reading higher and funny readings was down to my meter(not my fluke one). I brought home my spare meter from work(another fluke meter) I used that to measure the current and the other fluke for the voltage readings. Your right I...
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    Design new 0 to 30V power supply.

    I've add another hour on it and Finlay getting some where, I found out where I went wrong. I checked my schematic against the original very thing check out OK. I then studied the values and foot prints, I got incorrect values on R12 68K instead of 33K and R14 15K instead of 56K so the swap over...
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    Design new 0 to 30V power supply.

    I wondered where you went to. With it been Mothers day I think that it would be better left for today  ;D
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