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Old 25th January 2013, 06:58 PM   #3841
shaan is offline shaan  India
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Originally Posted by Esperado View Post
Shaan ? What is the use of the 1MOhm to ground input ?
The 1M resistor isn't connected to ground. Its purpose is to feed current from the joint of the two 10k trimmers to the input for offset nulling at the output. The 1uF cap filters out contaminants(if present) to ground.
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Old 25th January 2013, 08:06 PM   #3842
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Sorry, my mistake, i don't noticed the 1µf !
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Old 26th January 2013, 12:17 AM   #3843
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Shaan, what is that 10uF before the filter ? kinda curious ^^ Is it for DC preventative ?
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Old 26th January 2013, 02:16 AM   #3844
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Of course. If your preamp has no offset, you can remove-it to improve the sound definition. or use a film cap.
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Old 26th January 2013, 04:14 AM   #3845
shaan is offline shaan  India
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I missed a post and myself posted something unnecessary. Post removed.
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Old 26th January 2013, 04:28 AM   #3846
shaan is offline shaan  India
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Shaan, what is that 10uF before the filter ? kinda curious ^^ Is it for DC preventative ?
Yup it is a "DC blocking cap". Plus the value is high enough so that there is no bass loss. And as Esperado says, use a high quality film cap here. Mine however has a cheap nonpolar electrolytic.
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Old 26th January 2013, 12:14 PM   #3847
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hi lc,shaan

which is the correct schmatic of shaan build.
thanks.. this will be my next project
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Old 26th January 2013, 02:30 PM   #3848
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Yup it is a "DC blocking cap". Plus the value is high enough so that there is no bass loss. And as Esperado says, use a high quality film cap here. Mine however has a cheap nonpolar electrolytic.
Hm... I have some high quality film cap, but I don't remembering having such high value. I have tons of 1uF film cap though, but I think not enough for this purpose

If i'm not wrong, its a bit rare to have these high value film cap, isn't it ?
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Old 26th January 2013, 03:14 PM   #3849
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If i'm not wrong, its a bit rare to have these high value film cap, isn't it ?
10µF Film Capacitors | Mouser
http://fr.farnell.com/jsp/search/bro...alues%3D203072
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Old 26th January 2013, 03:47 PM   #3850
shaan is offline shaan  India
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I have tons of 1uF film cap though, but I think not enough for this purpose.
Bundle ten of them like dynamite sticks and join the fusewires at both ends. There you got a big and powerful 10uF dynamite... err... no, capacitor.
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