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  1. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Hi modem head , I did not have this lm317 data sheet from texas instruments when I first started , the ones I downloaded were just bar graphs and numbers wich I did not understand , I am surprised how much I have learned in just one month , I feel like I have come a long way from when I first...
  2. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Thanks for that Steve , what would happen if you changed your pot to a 10k , put in a cap on v out and turned up your current very high "with transistors fitted"? , I do get this working like you have in the bread board , I can now get it working in the prototype board with only one transistor...
  3. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Thanks steve that would be great , just to see if I am the broken pice of the circuit lol :) , I have been reading about capasitors today and reading the lm317 data sheet I downloaded texas instruments sheet best one I have seen with all the different applications , the recommended circuit for...
  4. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Done the transistor check on the ones I replaced all pretty much the same reedings on all 4 , these are not fried then?
  5. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    No I am using a solid ac to dc 4 leg chip.
  6. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Hi steve , it is a big transformer I don't have any specs for could it be that? I have 4x 4700uf caps on the input rail, I have 2 spare caps the same they came im a pack of six should I add these spare ones to help with smoothing , could I add diods to all the pins of lm317 , or can we reduce...
  7. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Duke I just looked up the ammeter radio club in Worcester it is only up the road from me lol how good is that I cant believe that it is exactly where I grew up as a lad " no way" , thanks for that I'll go up see what they can teach/help me with on tuesday , nice one ;-);-)
  8. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Well modem head mabe you are right the 317's stay live full on if they dont split open , I put them in the bread board for a test after it all goes wrong " if they look ok by eye", they smoke pots and still give out nearly all the volts I put into them one or two were saying 8v , the...
  9. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Thanks all I will look up all these radio shack things . Well it was working I hooked up one transistor to it and a car bulb it worked fine so I went ahead and hooked up another , the pot burst into flames as soon as I powered up , that is my first fire lol. No more 317's left 4 gone today 4...
  10. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Right then bob it is ok so far "with transistors disconnected and no cap between pin 2 and gnd " ,it has been running for half hour or so with no hot bits lol I am stupidly happy lol "well so far" . Like dave said in a previous post one transistor at a time then :-):-):-) ignor the red tapes...
  11. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Hi bob if the cap is no good Can I use a different value cap? if so what range would you recomend . I have the cap straight off the 2 pin to gnd it is a + - cap, - being on gnd side, + on pin 2 just to confirm is this correct :-)
  12. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Lol lol :p:D;):)you guys are funny Im sat in the shed chuckling after reading all those posts, im back at it I have it all working fine in the bread board no frying with new lm317 or arking in the adjust pot and a led to adjust on . But I jumped the gun again and copied it to my prototype board...
  13. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Juke ,I do use a 10uf 25v cap in the prototype board I'm just getting things the right way in the bread board first to try and prevent frying transistors again, I have made too many mistakes not knowing enuf so I'm going to slowley build step by step with all you guys so I know exacly what does...
  14. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    I tried a new resistor a 1k 1% the pot still smoked , it does adjust but extreemly sensitive only quarter of a turn it smokes when turned to minimum volts , I should have 5 more 317's tomorrow im going through these things like a kid eats sweets lol good job they're cheap . How can I check the...
  15. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Thanks fellow granpas lol :) Back again with the new bits for another round of electrical fun/smoke , no steeve I don't get a data sheet when I buy theese parts, I have seen them on the internet tho but I dont really understand the bar charts I just look to see the pin layouts , I am going to...
  16. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    A little off subject but I thought I'd share to my helpers , my daughter turned me into a grandad today lol
  17. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    Yes perhaps I am trying to run before I can walk properly , I'll slow down a bit and try some car bulbs , I have had a 2n3055 wited to the bread board emitting and adjusting properly I cant seem to find what im doing wrong when moving to the prototype board ,I thought about adding additional...
  18. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    I know I am doing somthing wrong I just dont know what it is "fustraiting" lol but its how you learn or how im learning . 22v on main rail should be fine for the lm317t ,I have checked vin and vout lots of times , im using the correct resistor red violate brown gold between adjust and vout , I...
  19. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    And again the 317 and 10k pot fried just like overloading ??????:eek:
  20. heavyfletch2nd

    LM317 2N3055 Variable Circuit Problems

    I just found one a red purple brown . I put it in got good volts out of the output 19.7 i thought brill its working but then the 10k pot smoked ,
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