Recent content by ginji

  1. ginji

    darlington optocoupler

    thanks for the effort you put in guys :) the closest part i can get is a 6n138 - http://www1.jaycar.com.au/products_uploaded/ZD1940.pdf but i dunno if it's compatiable
  2. ginji

    darlington optocoupler

    Ante: I think you misunderstood me, i'm not trying to replace a part, rather get one to so i can use it as a precationary thing :) MP: First i've heard of NTE, and looking on the distributor list only lists one in Queensland.... a good 600k's away from me at least, with no option of ordering...
  3. ginji

    darlington optocoupler

    Ante: It's there so i don't fry the mother board of my computer and everything else with it if it stuffs up MP: I've looked at the datasheet and the 4n32 is the only part i have found that is close, otherwise i wouldn't be asking :)
  4. ginji

    darlington optocoupler

    I'm after a part that is close to the 4n32 (Fairchild) or TIL198 (TI - obsolete) optocouplers... I can get parts from TI, maxim-dallas and national directly but not fairchild :( and the TIL198 is unavialable... does anyone have an suggestions for a replacement IC?
  5. ginji

    Cold Heat Soldering Tool

    thats cool, but i like my weller better :P
  6. ginji

    Convert 0-30V 3A PSU to 5A or more

    Hey MP, i've built the power supply, and it works, and i should be able to take it up to the uni for testing with a cro later... will let you know what happens
  7. ginji

    0-30 Vdc Stabilized Power Supply

    it sounds like you've got some oscillation in the circiut somewhere. Check your rectifier, but apart from that, i'm not sure what else could cause it (maybe a short somewhere feeding back?)
  8. ginji

    Convert 0-30V 3A PSU to 5A or more

    another suggestion that has been made is to wire 2 pots in series, one the recomended resistance, and the other 10% for fine tuning
  9. ginji

    Convert 0-30V 3A PSU to 5A or more

    C1 upgrades to 4700uF or higher, 10 000uF is suggested i believe The rectifer bridge as a single 10A or higher part, this way it can be attached to the side of the case I'm changing Q2 from the 2n2219 to a BD139 (you can use a BD137) WARNING! the pins on the BD139 is different to the 2n2219...
  10. ginji

    Need help making a headphone amplifier

    try this: http://www.minidisc.org/headbanger.html if you can make a PCB for it, the circuit is about the size of a 9v battery (slightly larger) and it works really well (by that, low distortion, high amplification) I've built some before, quite easy to get the parts, and easy to make
  11. ginji

    Convert 0-30V 3A PSU to 5A or more

    it's been a while since he's actually built a transformer (last time was at least 16 years ago if not more) so i think what ever he can actually remember is a bit out of date. The article in articles section explains the process quite well (from my understanding of it) although i can understand...
  12. ginji

    Convert 0-30V 3A PSU to 5A or more

    hey all I am/mostly have built this power supply, but i've made some changes along the way: C1 is now a 4700uF 50V (Maybe change this later...) The 3 feedback resisters are metal film (R4/5/6) for the lower tolarence (1% compared to 5%) And i'm changing Q2 to a BD139 (if you want to make the...
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