Recent content by Damien

  1. Damien

    ATX PSU 24v mod

    Ahh shit forgot I'd already replied to this one lol. My bad. Hope you found a nice p.s.u that suits your needs. =)
  2. Damien

    ATX PSU 24v mod

    Ok, if you wanna mess around with computer p.s.u's this may help you - I hope so anyways. You can trick the I.C into putting out a higher voltage by showing the sense pins higher voltages. All you need to do is look up the I.C chip datasheet to find out what each pin does. I have successfully...
  3. Damien

    ATX PSU 24v mod

    Fair enough bigone. Have you considered building a linear supply instead? I made one using the lm317 variable voltage regulator which works well, if you change your mind I'd be willing to help. =)
  4. Damien

    ATX PSU 24v mod

    I did it. No need to re-wind transformers or whatever, all you have to do is alter voltage going to the sense pins on the I.C to trick it into thinking it's putting out a lower voltage than it is. I had mine variable all the way from 0 to 24v (You'll need to upgrade the output caps to a higher...
  5. Damien

    mod an atx supply with the at2005 chip.

    Oh almost forgot Here are the datasheets for both transistors (Just for the NPN side) I'll copy whatever is decided for the PNP side. Tip41c - https://www.fairchildsemi.com/datasheets/TI/TIP41C.pdf 2n3055 http://www.onsemi.com/pub_link/Collateral/2N3055-D.PDF Am I heading in the right...
  6. Damien

    mod an atx supply with the at2005 chip.

    Hey guys just while I have your attention and we're familiar with one another I was wondering if someone could answer a completely un-related question for me. In the circuit diagram I have provided (I'm using it for a class ab guitar amp) I have read that when using a darlington pair the total...
  7. Damien

    mod an atx supply with the at2005 chip.

    No can do! I blew my psu up lol If I come across another one, I'll come back to this thread but that could be years of months down the track. Watch this spot lol. =P
  8. Damien

    mod an atx supply with the at2005 chip.

    GPG: I'm wondering if setting up a voltage divider with a pot to set the pin at a specific voltage would work?
  9. Damien

    mod an atx supply with the at2005 chip.

    I guessed. Now I know it means isolated. =)
  10. Damien

    mod an atx supply with the at2005 chip.

    Got it to work but short circuited it and now it won't turn on anymore =( I guess it has no short circuit protection now. :/ I got variable voltage though and set the potential with a trimmer pot to go from 12v to 15v for charging batteries with a small 240v generator while camping. Could I...
  11. Damien

    mod an atx supply with the at2005 chip.

    Ohh ok I learnt something today. Thanks guys I havn't had a chance to look at it but when I do I'll let you know how it all goes. =)
  12. Damien

    mod an atx supply with the at2005 chip.

    Hey GPG Yeah I dissconnected pin 6 and grounded it with a 1k resistor but still doing the same thing. Another guy I spoke to on a forum suggested that you have to use the preset resistors (variable pots forming voltage dividers) on the other pins to stop the chip from shutting down, as it...
  13. Damien

    mod an atx supply with the at2005 chip.

    Hey there I'm trying to mod an atx supply with the at2005 chip. I've put a 50k pot between 12v rail and ground with the wiper going to pin 2 (voltage adjust) Problem is that as soon as it hits about 13 volts it shuts down due to I suspect over voltage protection circuitry. Is there a way of...
  14. Damien

    PNP transistor in CLass B push pull amplifier

    Thanks so much everyone I think this will help alot and yep I will have a go at Bobs circuit thanks for sharing that Bob. Yeah it's weird I guess as I have access to any sort of amplifier off the shelf but choose to make my own to get a better understanding & also want to make my own valve...
  15. Damien

    PNP transistor in CLass B push pull amplifier

    Just found it on google images. I think part of the circuit must be missing. I hear that there are two ways of building a class B? One involving a couple of center tapped transformers with two NPN's & the other using two separate power supplies with an NPN and PNP with the power supplies...
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