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  1. Damien

    5v linear voltage regulator design problem.

    Hey guys I was wondering if someone has a spare moment if they would would mind sharing their ideas as to why a makeshift 5 volt regulator transistor had a lot of heat being thrown off it with such a small load. Scenario: We're about to head to a camping spot to go camping, and I decide that...
  2. Damien

    Lab power supply from microwave transformer project.

    Awesome I'm in Melbourne Australia. =) What's everyone currently working on in the electronics world?
  3. Damien

    Lab power supply from microwave transformer project.

    Cddrive - Thanks for that cat5 utp cable trick for breadboard jumpers I've got a bit of that lying around somewhere I think! :) Fishforfun - Ok I hear ya. =) I'll be extra careful and only "experiment" with low voltage stuff until I know more. Thank-you for highlighting the dangers. Where is...
  4. Damien

    Lab power supply from microwave transformer project.

    Well in the interests of liability and stress levels, , lets just assume that I'm talking about low voltage stuff from now on. I'm curious about transistors. I've been salvaging old components from scrap circuit boards and have a method of determining whether a tranny is n.p.n or p.n.p but is...
  5. Damien

    Lab power supply from microwave transformer project.

    Oh I see yep that makes perfect sense. Ridiculous though isn't it? I think people should be held responsible for their own actions. Just to give you a basic idea of where I'm at - I did a couple of months of a sustainability/p.v course but didn't get further than ohms law and dropped out...
  6. Damien

    Lab power supply from microwave transformer project.

    Oh thanks for the jumper lead trick that should make things easy. I was thinking of getting light guage multicore & just twisting them really thin & a little solder to stop the wires from bending as they're inserted into the breadboard. Uhh here's the thing Dave I've been working with 240 for a...
  7. Damien

    Lab power supply from microwave transformer project.

    That's Dave yep I might build some more simple transistor circuits first to familiarize myself more as this is all so new. I ordered a 555 timer ic & some more mosfets & resistors to play around with blinking led's & possibly get an oscilloscope to have a look at what the waveform is doing in...
  8. Damien

    Lab power supply from microwave transformer project.

    No worries Dave thanks for your help. =)
  9. Damien

    Lab power supply from microwave transformer project.

    Hi Dravenn I thought that the number of turns on the secondary was directly proportional to the voltage on the secondary if the turns on the primary had the same number of turns as the input voltage. Anotherwords, I thought that 20 turns on the secondary would equal 20 volts a.c on the...
  10. Damien

    Lab power supply from microwave transformer project.

    so say 100 turns of 18SWG gave 20V @ 1A = 20W <-- This part.
  11. Damien

    Lab power supply from microwave transformer project.

    *dives head first* haha. This look ok for a rough draught? Probably the most complicated electrical circuit I have drawn before. I know I have some spelling errors in there like hf instead of uf on one of the caps. :P
  12. Damien

    Lab power supply from microwave transformer project.

    Weird...I thought the number of turns on the secondary was directly proportional to the voltage put out by the secondary. Since I'm only using crappy thin wire which leaves a little spare room in there I could get something with less insulation and more conductive material and it would give me...
  13. Damien

    Lab power supply from microwave transformer project.

    Well, as much as I can get from this transformer then, even if I have to rewind the secondary with thicker wire to make small tunings. So tell me more about this switching regulator controller please? Thanks for your help guys. =)
  14. Damien

    Lab power supply from microwave transformer project.

    Seven minutes 20 seconds into this tutorial the guy talks about using mosfets in parallel to increase current capacity in a circuit. To make my circuit variable though, do I put a variable resistor from gate to source on all of them or only on one and somehow drive the power mosfets from the...
  15. Damien

    Lab power supply from microwave transformer project.

    Hey guys I'm at a standstill with my project. I've been playing around with really basic electronics for years but thought I should take it to the next step, decided to make myself a big battery charger for charging a bank of batteries while we're camping and use our 240v gennie but have it so...
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