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MonSSter
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i replace d5 and d6, and nothing ... i measure as you said and i got the same measurement's ... that's d5 has 0v, r3, d7 has around 0,7v ... so i realy don't know now :( ... you think i should start all over again?
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yep ... many many times :D
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well replacing D7 did nothing new ... so i measure the voltage on r2 where there is 17.7V, and on D5 there's 0V(?!) ... any ideas?
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ok i belive that diodes are dead or something, because on d7, theres 0.7V .. so i will replace them during the weak and then report again .. tnx!
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..and what are the parts for negative voltage?
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r13 has ~34V ... and r14 has 0.8-0.9V ...
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Hi!
exams are over, so i can finish the power supply now ... i think i located the problem and that is the voltage on q1, collector is 0.8~0.9V so i'm asking if that could be the problem( i have no output ) -
..and how did you do that?
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well . . the output voltage of u2 is the same as before thats .. around 200mV and he's still very hot. The u2 is tl081
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hmm .. I replaced q4 and u2(q2 looks ok)disconeted the r15 but nothing happend... output was i bit higer that's all ... so the thing still doesn't work :D ... any new directions(maybe you draw me the solution :)). Tnx
eemmm ... q4 C = 34V, E = 0,5V B = 0,5V -
helow! it's me again :) .. well i replace the Q2 and the u2(new one is still heating like mad) and now the output voltage is ~0.4V .. the voltage in q4 E,C and B is 32V+ ... so what is wrong now?
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ok .. will go and replace these componets and then report :) .. thx
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well ... i changed the orientation of the Q2( so that the emitor is pointing towards 8th pin( the base of Q4 ) ) and now the situation is following ... output voltage is 0.5V, u2 is still heating like mad ;), the voltage on Q2 collector is ~34V ...
Q4 base volt. = 0,5V
collector volt. = 34V
Q3 emmiter volt. = 34V
U2 output = ~200mV
any directions? -
i do use 24 transformer.
the 6pin on U2 shows ... 0V, and the Q2 shows 34V ... so you think that Q2 is destroyed? -
Hi!
I just builded your power supply but i doesn't work ;) ... at output it always shows ~34V and i can't regulate it with P1 ... U2 is heating like mad... i checked and rechecked the PCB and will do it again :) ...
voltage on C1 is 34V, also on R1 ..
the voltage on U1, 6pin is 11.2V and it doesn't change if i move P1 ..
voltage on U3 is always 34V it doesn't change ...
but if i move P1 the voltage on R9 changes from 0.5V to .. 11.11
If you need any more measurmeants u ask ;)
PS: and of course ... sorry for my bad english -
Thank u for quick answers :)
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Hi! ... i'm new on this forum so i have some maybe allreday answered questions... sorry ;)
i'm wondering if someone has made a 5Amp modification and use the LM338 insted of LM317? is there a new PCB for that or something? Tell me what u changed...
I'm also thinking to do a dual power supply. that's two adjustable power sources. Can I build two PCB's and then use transformer whit "double secondary connectors".. i hope u know what I mean... and use it like that whit no further modification...
Thank you!
0-30 Vdc Stabilized Power Supply
in Projects Q/A
Posted
r2 is 82ohms, also nothing is shorted ... maybe this will help .. c3 voltage is also 0, and c2 is 17.7V(but as you said, there's AC not DC )