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Old 15th April 2006, 03:00 PM   #21
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Default Re: it didn t work :(

Quote:
Originally posted by Ahmad_tbp
it didn t work ...
i changed the two input couplage caps to 47n and the output couplage cap to 1uf , and use it before pre ,
it didn t work !
any idea ???????
Have you made sure it's all connected properly?, try fault finding, it's a very simple circuit.

When you say it doesn't work, what doesn't work?.
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Old 15th April 2006, 03:08 PM   #22
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i mean it doesn t work correctly :P ...
it s a very loud sawtooth or square wave around 80/100 hz ( i m not sure bout the wave and freq , i don have a scope ) comin out of it , but when i turn the 2nd pot (25k) all the way down the noise become silence suddenly , i connected my signal generator to it , very very little pulsin sound come out of it !!!
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Old 15th April 2006, 03:19 PM   #23
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Sounds like you have the + and - inputs reversed.
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Old 15th April 2006, 07:53 PM   #24
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+ and - inputs reverse ? no ...
i checked all the wires and pcb again and again ,, no error i think ,,, any idea ?
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Old 15th April 2006, 08:59 PM   #25
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Ummm, what else can cause this... transistor in backwards or one that's leaky, R/C time constant too short (getting FB through the LED/LDR), which can also happen with correct R/C if the LDR is in the wrong spot in the circuit and finally, the 3900 is a hi-Z device - incorrect wire dressing wreaking havoc.
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Old 15th April 2006, 09:11 PM   #26
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Quote:
transistor in backwards or one that's leaky, R/C time constant too short (getting FB through the LED/LDR),
no man ! i m talkin bout the valve comp/limiter schematic i sent , i built it , ...
here s the pcb , maybe i make a mistake and didn t seen it
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Old 15th April 2006, 11:47 PM   #27
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Quote:
Originally posted by Ahmad_tbp

no man ! i m talkin bout the valve comp/limiter schematic i sent...
Ah, OK!

Then what you're describing is powersupply ripple. It needs a superclean supply and good decoupling.
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Old 16th April 2006, 09:14 AM   #28
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Quote:
Originally posted by Ahmad_tbp

here s the pcb , maybe i make a mistake and didn t seen it
Just wondering?, why make a PCB and then not mount the valve holders on it? - it seems rather a waste of time?. If you're mounting the valve holders on a chassis, why not hand wire them? - in classical valve fashion (particularly for something as simple as this).

The old TV manufacturer KB actually manufactured valve colour TV sets all hand wired without PCB's! - incredible what you can do!.
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Old 16th April 2006, 07:08 PM   #29
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cuz it s just a test pcb , i ll built preamp,comp and tone control on one pcb ...
and u said hand wired .. does it make more noise ???
and is my problem is my power supply ?
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Old 16th April 2006, 07:31 PM   #30
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wat if i use this power supply ?
http://www.diyaudio.com/forums/attac...amp=1144698398
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