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Old 18th April 2019, 10:31 AM   #11
nirupambhowmick is online now nirupambhowmick  India
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Location: west bengal
i mean...
Tone control > 2uf ?> 4k7 resistor > 100k volume > 2uf?> Final stage of the preamp.

Last edited by nirupambhowmick; 18th April 2019 at 10:42 AM.
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Old 18th April 2019, 10:43 AM   #12
mchambin is offline mchambin  France
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Quote:
Originally Posted by nirupambhowmick View Post
i dont know about coupling time constant thing. Do you thing 2uf would be adequate? Help me.
A coupling cap is in serie with some resistor R. The time constant is R x C. The corner frequency is 1 / ( 2 x Pi x R x C ), that means, lower frequencies below do not go through while higher frequencies do go through. It is not sharp, this goes gradually. At the corner frequency, signal goes through with a 3 dB attenuation which is 71% amplitude. Much lower 0%, much higher 100%.
This is explained in EE books at "First order system". Read real books, not audio oriented litterature.
What is the "some resistor R" ? : That is the sum of the source impedance ( what feeds the cap ) and the load impedance ( what loads the cap ).
So R x C depends of where you insert the capacitor.
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Old 18th April 2019, 02:19 PM   #13
nirupambhowmick is online now nirupambhowmick  India
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Join Date: Mar 2017
Location: west bengal
Quote:
Originally Posted by mchambin View Post
A coupling cap is in serie with some resistor R. The time constant is R x C. The corner frequency is 1 / ( 2 x Pi x R x C ), that means, lower frequencies below do not go through while higher frequencies do go through. It is not sharp, this goes gradually. At the corner frequency, signal goes through with a 3 dB attenuation which is 71% amplitude. Much lower 0%, much higher 100%.
This is explained in EE books at "First order system". Read real books, not audio oriented litterature.
What is the "some resistor R" ? : That is the sum of the source impedance ( what feeds the cap ) and the load impedance ( what loads the cap ).
So R x C depends of where you insert the capacitor.
I am not a student of electronics, it is just my hobby & I love it. I do not know which book to read. If possible then please mention some. Off course about basic audio.
Ok now please help me out. I do not have 6.8uf cap, but I have some good quality 1uf caps.
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Old 18th April 2019, 02:23 PM   #14
nirupambhowmick is online now nirupambhowmick  India
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Join Date: Mar 2017
Location: west bengal
How about 3uf after the volume pot?
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