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Thread: Finished Tutorial for PressLab's DC-DC

  1. #21
    Constant Bitrate jboy's Avatar
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    Lightbulb

    Looks good, I am going to try this soon with a custom routed PCB (misuse of work equipment ) but have some questions.
    Have you tried using a solid core (torroidal) transformer?
    The low number of turns wouldn’t make this very hard to do and there should be a gain in efficiency, I think? I need to put some time into this if no one has tried before or can do it quicker (too much OT).

    [ 01-06-2002: Message edited by: jboy ]
    If you come out talking sh1t don't try to turn around and wipe you azz.

  2. #22
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    Angry

    I would make sure and put that thing in a metal box far away from anything combustable with a really good fan.Or have really good fire insurance..... when the fan quits.At least Jeff's or Sproggy's would probably run for a hour or two without a fan running,from looking at the size of the heat sink.After all those were made to run in a vehicle,unlike all of these modified psu's.Nothing against Presslab neat idea but looks like a fire hazard,the keypower psu will have the same problem alittle to much summer heat and a slow running fan BYE_BYE psu

  3. #23
    Live and Kickin'
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    Heh, with all the electronic stuff in my car, I got a special automotive fire extinguisher, just in case

  4. #24
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    Originally posted by kingtweeter:
    <STRONG>I would make sure and put that thing in a metal box far away from anything combustable with a really good fan.Or have really good fire insurance..... when the fan quits.At least Jeff's or Sproggy's would probably run for a hour or two without a fan running,from looking at the size of the heat sink.After all those were made to run in a vehicle,unlike all of these modified psu's.Nothing against Presslab neat idea but looks like a fire hazard,the keypower psu will have the same problem alittle to much summer heat and a slow running fan BYE_BYE psu</STRONG>
    And how do you know this??? yeah, so, the mosfets get hot with no-load, so, how is that a fire hazard?? even if they do overheat, the power supply wouldn't cause a fire unless the mosfets are resting against something flamable, and why would you do that??

  5. #25
    Constant Bitrate samael's Avatar
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    ok how hard is this. i mean i can solder , if its not to fiddly.... i can get my hands on a breadboard etc.... i have dne a wee bit of soldering for example modifying a sega saturn so i could get sterio left and right and composite video out of it (but that wasnt to hard). also is it more expensive than buying the parts for sproggys? (it was gonna cost me about 70-80 nzd ....)
    thanks
    stupid quote # 1 : "i dont do drugs , i only ever smoke pot when i'm coming down" , Me , 6 september , 2001.

  6. #26
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    Originally posted by samael:
    <STRONG>ok how hard is this. i mean i can solder , if its not to fiddly.... i can get my hands on a breadboard etc.... i have dne a wee bit of soldering for example modifying a sega saturn so i could get sterio left and right and composite video out of it (but that wasnt to hard). also is it more expensive than buying the parts for sproggys? (it was gonna cost me about 70-80 nzd ....)
    thanks </STRONG>
    This "project" is quite complicated, but shouldn't cost much to try to make.. The transformer is the hardest part, so I suggest you buy the wire first, and wind the transformer first, before you spand money on the other components..

  7. #27
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    I have all the parts to make sproggys supply x 6 so if you are interested just email me Im sure we can work something out

  8. #28
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    Originally posted by Ces///M3:
    <STRONG>I have all the parts to make sproggys supply x 6 so if you are interested just email me Im sure we can work something out </STRONG>
    why do you have 6 of each?? FREESAMPLES???

  9. #29
    Variable Bitrate
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    One question on Presslabs supply. If you start with a 250W supply and make this modification, what will the total wattage be when it's dc to dc supply?

    Thanks,
    Pigseye

  10. #30
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    Ummm, by my calculations, (going by the number of 'double ups' and the way the transformer is wound, and the thickness of the wire) I would say about 60watts maximum.. don't believe me, believe it!!!

    Its like 8amps maximum on the 12volt rail, with nothing on the 5volt rail, or 8amps on teh 5volt rail, with nothing on the 12volt rail.. or, 4amps on each, or whatever else you like that doesn't add up to more than 8amps..

    [ 02-18-2002: Message edited by: THEMP3KID ]
    2 week temp ban (spam and complaining about deleted posts)
    register another account and you're gone for good.

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