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  1. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Ok thanks the multiplyer in this case is red=2×0 im picking it up slowley, i just downloaded a resistor chart to look at What colour is 250-260-270 like i am supposed to be using? , red blue red then like chart shows ? and what is the functioning difference up and down these ranges . Is 2200...
  2. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Thank you dave;) I get a bit confused with the ohms when people write it down as 220 or 2200 , my mistake I just do not know enuf yet to know these , so let me get this right and ask probably another silly question :oops:"and you can all chuckle if you like its fine im on L plates here lol", so...
  3. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    ?? Im powering the the charger with the "not quite built correctly yet" power supply.
  4. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Thanks for the reply.. i think im close to victory here its getting fustraiting , this is a lot harder than I expected to be when deciding to build a high current adjustable psu , I got it working "sort of " just not properly ,.yet, are you saying I should try it without the resistor in it and...
  5. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Right then ( all new components ) it was all working fine on the 10v 1.5a wall adapter just a bit low on the volts as expected , I put In the big transformer connected it all up connected multi meter to ouptput with no load and it started at 21.6v a minuet later the volts started dropping and...
  6. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Its definitely a learning curve "brain bashing":confused: lol hopfully I'll get this circuit in some sort of built state tomorrow mabe even use it on a six amp fast battery charger for a test run see how warm things get but I must sleep its 3:17am uk , is it nice n sunny where you are opposite...
  7. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    a new board without a capasitor I had in there , "the light blue shiny one" I changed that for a normal looking cap 16v 10uf , put in a new lm317, " I only have 2 left out of ten" now I got adjust in my prototype board and not frying the lm317 , I have connected jumper leads to a new 2n3055 it...
  8. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    I cant even get this ↓ to work properly when I copy it into this↓↓ even all colour wires are kept the same so I could'nt make a mistake , I only get 0.8 of a volt adjust , tried new 317 and new 10k pot , i could bang my head on a wall !! Give me another kick start steeve please:)
  9. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    good point dam it why didn't I think I could kick myself , they're all conducting via outer casing so wouldn't be any point in having four separat resistors lol thanks , I'll tig it back on and get some insulators I may aswell get some for the 2n3055's too as its all coming apart for round two...
  10. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Hi steve . Yes I should have tested them first ,another stupid mistake I know but i am learning 'the hard way' lol ,I have cut off that one side of the heat sink with the out put resistors on it I will bolt that in separately once its powering correctly , this psu is going to be my only psu I...
  11. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Back again guys. In the first pic in the bread board this is adjusting without npn 2n3055 connected just a small 12v fan. in the second pic with 2n3055 connected there is no volts out of emitter. if you look closley at the third pic of the actual build you will see i have mounted the out put...
  12. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Thanks guys it is imbarracing but I did say before I started I was a noob at this ,I searched for a simple drawing with high current found that one looked easy bought the part list and cracked on with it and failed , I didnt know about power in on left and out on the right in a drawing when I...
  13. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Why is the pic of lm317 showing pins different to the circuit pic you added ,vin on left side of lm317 vout right side of lm317 and adj middle can you use different pins as adj? I just fried a 10k pot after i put together that circuit with vin on left vout on right and adj middle now I am even...
  14. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    I got all the pins correct dave it still not working when I wired it to bread board last night changed a few wires around like I wrote in above paragraph I must have been reeding adj of the lm317 alone not through the 2n3055s . Do you have one of each of these components or similar you could put...
  15. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Thanks dave . Looking at that circuit diagram I coppied and built why did i have to change the collector and emitter wiring around so the metal plate i have the 2n3055 on now live + out and how and where would I controll the current if its possible . Allso I tried adding green led for power on ...
  16. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Thanks for the replies it is appreciated hope I get people with knowledge interested in helping I would like to add extra features into this circuit , right then I think I got it ,I built the circuit In the bread board again with spare parts ,i swapped around the collector and emitter wires on...
  17. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Hi all I am a noob learning and having trouble with building a new power supply i got all the parts needed and built it . i have had it running but it constantly runs with adjust lm317 and 10k pot not working am i missing somthing simple in this circuit that i just dont understand . could...
  18. heavyfletch2nd

    Transformer

    Ok:-D it is now how i expect it to be with the 1.5v drop out we are now at 14.5 volt dc perfect for a car battery to be charged ,"better safe than wast money" thanks for replying I may ask a few more q's later on when putting together a smothing variable volt/current curcuit for the other half...
  19. heavyfletch2nd

    Transformer

    Ok I will pull another bridge rectifier from somthing that I know is working and post the outcome , I didnt expect the 70 amp duel diods to have that result in drop out wich is why I really started this thread before setting any more fires , im no expert by any means this is my first attempt of...
  20. heavyfletch2nd

    Transformer

    Thanks for the reply .. here are a cupple pics . Pic 1 ,The rectifiers ..the first rect on print pcb circuit i thought would work (came from a 15v curcuit ) used to charge 14.4v battery popped as soon as I turned it on. The second in the pic bolted to the heat sink is taken from a laptop charger...
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