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Chip Amps Amplifiers based on integrated circuits

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Old 27th April 2007, 05:57 PM   #451
Nordic is offline Nordic  South Africa
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I suggest you post in the tradeing post with a link to this thread....
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Old 14th June 2007, 12:30 AM   #452
errhec is offline errhec  Slovenia
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Hi
Is the C105 have to be the 630V or it could be 500V (PIO)?
Thank you
ErrHec
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Old 14th June 2007, 02:29 AM   #453
digi01 is offline digi01  China
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for the 2nd Verion,C105 could be 120VDC.

FYI,I use 0.47uf 160V ero for C105.

Zang
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Old 14th June 2007, 06:13 AM   #454
errhec is offline errhec  Slovenia
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What's the influence of the value of the capacitor C105 on the sound?
More biger capacitor more bass?
C20 is 10uF ELCO R9 is 120 ?

TNX for quick reply.
ErrHec
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Old 14th June 2007, 08:28 AM   #455
Nordic is offline Nordic  South Africa
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Firstly it is there to block the DC component from the valve output..., secondly it forms part of a lowpass filter, so increasing the capacitance will change the knee of the frequency response to be lower, inreasing the voltage would probably reduce esr a bit, but it will increase the cost and will be larger.

C20 you could go for 10 to 100uf, exceeding that may cause problems for the reg, according to the datasheet.

R9 is 120R is correct

the output beween the 2 pins of the regulator that it connects, try to maintain a voltage of about 1.25V there... the datasheet suggests a minimum load of about 10mA, 1.25/120 = 10mA
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Old 16th June 2007, 10:38 PM   #456
errhec is offline errhec  Slovenia
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Me again.
The copmpany send me the wrong capacitors ( C1-C8; C13-C14)
They send me 100nF/50V instead of 100nF/100V
But it should be ok, since the supply voltage is 25V ( max) what it came
36V DC?
Could i use it or is better to be at least 63V??
Thank you
ErrHec
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Old 17th June 2007, 08:18 AM   #457
Nordic is offline Nordic  South Africa
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I build mine with a greinacher voltage doubler and a 24V pcb mount transformer... but if you are running 35V rails, 50V should be fine. I think the electrolytics are 50V too...
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