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GrahamG

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Posts posted by GrahamG

  1. 0-30V Stabilized Power Supply

    in Projects Q/A

    Posted

    tesseract

    Brilliant. I think you are the first person that I have seen on this forum who has actually built the unit and made the associated comments about various parts that need to be changed or put off the PCB.

    Did you suffer from this 0V adjust problem with the original cct or is it just the newer version that does this ?

    Nice to see also that someone has published the EAGLE CAD files. A great help.

  2. 0-30V Stabilized Power Supply

    in Projects Q/A

    Posted

    redwire - thanks fo ryour feedback.

    That can be done in the autorouting routine.


    I prefer not to auto-route on Eagle as I dont like the way it places tracks. A double sided is fine for me as I just use jumpers for the top layer, adjusting the via diameter for current.

    The main thing is to insure your diodes are oriented in the correct direction.  Also a large number of builders connect the BCE terminals on the transistors incorrectly.
     

    Noted on your heatsinks and wire sizes, and diode and ECB orientation. I am an electronic engineer and know about this. Overlooked very easily!

    I have not checked the circuit out but I hear what you say about RV1. What was it "supposed" to adjust ?

  4. 0-30V Stabilized Power Supply

    in Projects Q/A

    Posted

    redwire - thanks for the tip. I saw the additional options but didn't open it. I was looking in the icons above the message box.

    You presumably have built this PSU. When I eventually get around to routing the PCB and buying the TXs are there any points to look out for ?

    I noted in the list of components that some of the specifications are short - i.e. diode bridge should be rated at the full load current and the output driver transistor will probably have to be mounted on a heatsink as the base current to the output TR's will be high (hfe low on these output TR's).

  6. 0-30V Stabilized Power Supply

    in Projects Q/A

    Posted

    u mean to say that i should make only one sided board and connect the upper sides by wires instead?

    Exactly.That is how i do it all the time for making prototypes. You just have to remember to keep the top layer "jumpers" straight else you will be soldering in some weird looking wires. If you have to go around a corner then use top-straight, bottom-angled and the top-straight again.

    Also remember to make the vias for the top layer with at least a 0.8mm hole size and 1.6mm diameter else you will destroy the via when you drill it.....

    if so will normal jumper wires do or i have to use thick ones.

    normal UTP core is what I use. Only need heavy duty wire for high current tracks.

    and which schematics etc are you using? one on first page by redwire?

    I have down loaded the latest, the one with all the RED text. I havn't got much further other than to redo the schematic in Eagle, busy now with routing tracks from the netlist

  9. 0-30V Stabilized Power Supply

    in Projects Q/A

    Posted

    So I decided to throw D15 away and replaced it with a peace of wire. Now I am able to get 30V with 3A.
    If someone has the same problem as I (The rectifier voltage is to high for the oamps with 44V) you can use D15 which should have only as much voltage as you need to get under the 44V. The voltage in my circuit is about 39.6V - 44V and nothing is damaged.


    I have just started with this project and am reading up on all the alternations/changes that have been made but I can't find "D15". Am I missing something in the schematics ?
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