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egres

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Posts posted by egres

  1. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted

    AG,

    thats ok, i thought something with fonts will be wrong :)

    well.. i am sure you know that those bulbs must be cooled.. atkeast with air.. when i wired it in series, and connected 24 volts for few seconds, it did not blew up, but my table is a little brown in that place :D .. and the bulb started smoking :D .. but i did not wanted to sacrifice it for my experiments :D

  6. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted

    well, the transistor was hot when i managed to connect 12V bulb on it.. i set 14V on supply, and the current was 2A.. so (BIG 500VA transformer with 4 primary wires.. output can be 24,27 or 30 Volts.. set on 27Volts) -> after diodes it is cca 34Volts.. 34-14=20 -> "unused" voltage  20*2=40 watts on heatsink.. heatsink is not black, and it is from pentium 4, 1ghz CPU, so it is not the best for this app..

    i am going to do a two-stage fan controller tomorrow.. (off-20%-100%), using 1n4148 diode on a heatsink, and tl082.. would you be interested in it? should i post a circuit diagram here?

    egres

  7. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted

    well... i have just finished mine.. if i wasnt a bit stupid, it could work on a first attempt ::)

    i have bought two BD241C as Q1 and Q2 and two 7805 stabilizators for voltmeter and ampermeter... i dont know how, but i soldered 7805 in a place of Q1, and i spent 4 hours checking everything  ::) i replaced it and it works fine..

    i must buy a 0,33ohm resistors, because i forgot to buy them yesterday.. with one TIP3055 the heatsink gets quite hot..

    so thank you,  ;)

    egres

  9. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted

    excellent, exactly what i wanted to know..
    thank you, audioguru

    i will find your part list in the forum, i dont want to misuse yourself  ;)

    and by the way... i was looking at the 5A version in the forum.. the changes are not that big i expected, but i think i will start with 3A..

    thanks again

  10. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted

    hi guys,

    i am new here, (but i have been watching your forums for a couple of weeks) and i found that power supply very interesting.. i have got a big transformer from broken UPS, output is 24volts (hehe, 400-500VA :P, so maybe it is a good idea to build hmm.. lets say.. 10A supply in the future )

    so i decided to make your power supply..
    but there are nearly 80 pages about it, soooo, im a bit lazy to read that all to extract some useful info

    can you tell me, what are the major difficulties of the construction?
    ( shown here, it is the default version )

    maybe changed types of power transistor, and op-amps.. (im sorry, i know that it has been already mentioned in the forums, but it is not providing an easy survey (whoo, what a lexicon-type expression) )

    .. i hope you got my point.. sorry for my bad english, if it is so flagrant

    thx everybody

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