Ian.... i will check the the pair 1N5401 B-E while powered up and tell you the measure i began to have hope that very logic.. while the input differential pair those who control the offset
the 100w ultimate post... i think i'm getting enough help here from all of you good kind folks ... thank you all dear friends
the 100w ultimate post... i think i'm getting enough help here from all of you good kind folks ... thank you all dear friends
That what i thought Ostripper but what else i could do but to make my own thread hopping help from others.
Vin Diesel,
nobody can help you without detailed pictures of component side, solder side and power supply.
12V on speaker output means you have problem with grounding or input dif. pair.
nobody can help you without detailed pictures of component side, solder side and power supply.
12V on speaker output means you have problem with grounding or input dif. pair.
Vin,
If you can tell me what rail voltage you are using I can post some shots from spice showing what range the voltages should be. That may help you find the issue.
If you can tell me what rail voltage you are using I can post some shots from spice showing what range the voltages should be. That may help you find the issue.
i'm Using postivea and negative 40VDC ... by the way mr...i measeured again with no input signal and no load ... i found 12VDC on both the input terminals
i'm Using postivea and negative 40VDC ... by the way mr...i measeured again with no input signal and no load ... i found 12VDC on both the input terminals
Are you running a separate ground wire from input ground to the star ground?
Hi Vin,
I'm attaching a schematic with approximate voltages. They should get you in the ballpark. I did it in PDF so it was more legible.
Hope this helps.
Blessings, Terry
I'm attaching a schematic with approximate voltages. They should get you in the ballpark. I did it in PDF so it was more legible.
Hope this helps.
Blessings, Terry
-- sir i don't know how to thank you ... this simulation schematic really making me a lot happier ..
as a reference to the schematic readings you sent.... i think i got a problem with "Q3" it's collector voltage is not 10v it's 17.5v so the voltage drop across the 10k Resistor "R3" is 8.5v but in your simulation it's 659mv which is leading to the voltage on "Q2" Base which in my case is 7.9v ( Very big difference 50mv to 7.9v😱) and some how the collector of Q9 is 9.5v instead of 1v😱......which finally i think it's loading effect on +ve to be 33v instead of 40v while it's not the case in the -ve supply it's -40v no problem..
so sir i think Q3 may be causing this ( i double checked it with diode check on multimeter it's fine) or what else could be causing all this mess ....😕
but i think now i'm very near to the mistake ... thanks Mr.Terry
Double check all your solder joints. Easiest way is to simply go through and reheat each one. Have a little solder ready for any that look like they might be iffy. This alone had saved me many times.
i will do that .. and i think to save time also replace the Q3 with another one and may be input pair too what you think?
If it tests fine with a diode test I would wait on replacing it. I suspect either a cold solder joint or solder bridge. If you can post in focus pictures of the top and bottom of the boards it would be a great help.
First of all .. sorry for being late ..work pressure ....
okay i will take some shots for bottom and top and post it .. just arrive home and do so
thanks
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