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  1. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Ok one transistor connected still no smoke , "but" with the pot turned down I still have 12.5 v on the out put of emitter 1.27v on pin 2 of lm217 , turn put up and I have 19.5v on emitter 20.6v on pin 2 ?? Lol o_O hopfully you can see from this pic how it is all connected.
  2. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Should I connect a transistor , these are new transistors I have metered them too at 690 to 710 all have different readings , to be honest I was expecting to see a 0.5 or somthing like you two have mentioned before as I have not powered them yet.
  3. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Its connected suprising to me no smoke yet 21.5v across caps , the small spur of solder coming off the live rail is the feed to lm317 .
  4. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Yes Four separate readings and in reverse the ( I ) , I will go ahead and connect , before I connect any fans or transistors I will post a pic of the volts across the caps for steve ,
  5. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Yes I am getting 605 on the meter both sides of thr bridge , the meter stays on ( I ) on reverse.
  6. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

  7. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Modemhead Should I connect up to the transformer or should I check anything els first , duke no not yet had time to go up with the daughters new born living with me but I will at some point:-)
  8. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

  9. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    I have pulled these from a ancient board 1N540 , I did a diod test all read 670 are they good enough to do the job?
  10. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Ok thanks bob I will make a 4 diod rectifier and test that , I will let you know soon:-)
  11. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Well bob I been through a few to burn the pots , I still think it will smoke when I connect it to the big boy Iit has every other time , but first Steve 9.3v on the smoothing caps off the 9v battery , adjusting the pot makes a bit of difference "there is a led connected" i have 14+ volts dc out...
  12. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    New battery steve, I took your advice and bought 9v pp3 to do this with and the connector to plug it into to make it easy to power the board , the lowest thing I got to use is the 10v 1.5a wall adapter , I was getting a bit fed up with smoking the 317's and checking everything is in the right...
  13. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Yes , well 7.4v before the decline but that is close enough with these cheap meters right . And I went back to the algebra modemhead sent me to understand with the explanation diagram to work out how to do the calculations CLICK "so far anyway" very good explanation , I did the math on a...
  14. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    The pot is now correct (+, -)so we don't get confused sorry about that:) , this is the reading with the right side meter ( + ) probe "yellow clip" connected to the 220 resistor black probe connected to the Middle pin of pot , the pot is turned down 1.27v on out put. The second pic is pot turned...
  15. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Lol to be honest I didnt think it mada a difference wires on the pot as I thought the pot is just a loop making a circuit and the varable resistor would still work the same just be backwards lol im still learning. Im out at the moment , when I get back later "a few hours" I'll go and do it...
  16. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    The yellow clip is on the orher side of the fixed resisror (adjust pin side) thats where I though It would make sense to be looking for the fixed voltage ??.. lol knitting lol mabe lol:) I did think about the other side if the fixed resistor but then the clip would be pretty much in the same...
  17. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Well I got out of bed to do this its 330am lol:p im that addicted to it at the mo, im not getting those results when pot is turned down one metre is showing 0.02 across the resistor its a 220 ohm resistor , the other metre on the v out pin is 1.27 , by the time the pot is turned up full with a...
  18. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Modemhead I wish I knew you posted this earlier I didn't get a notification , I think its about 6:00pm where you are so hope your still around , thanks for that I do kind of understand this math I am only a month into this tho, it is starting to sink in its just knowing when to do ÷ or × on what...
  19. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Modemhead I just tried that, I get the same reading off both meters 1.26v off a 1.2v rechargable aa battery , but it seems way out of cal when testing a single diod on the diod setting . Uh?
  20. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Ok steve I will leave out the big transformer for now , did you read my comments on thinking about limiting the current to the v in on lm317 and usung diods on the lm317 pins , "it was just a theory" :-) , the pics are for modemhead , looks like you are right I pulled out a old metre hooked...
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