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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: You have forgotten something... posted by Coyote on August 21, 2002 at 22:09:15:
That is most probably a mute transistor, and the CDP uses it to
put a known zero-charge on the output capacitor after power-on.So you have a 33k load impedance. Let's play safe and make it 20k.
Then for a -3dB point of 2Hz (we really want to be one full decade
below 20Hz), we end up with 4uF.2Hz because only then is the phase shift at 20Hz limited to about 10 degrees. With a 5Hz -3dB point phase shift in the 20-50Hz band
would be excessive.Why then the original 47uF capacitor, putting -3dB at about .2Hz?
Well, it is an elcap. Elcaps exhibit their largest AC distortions in the range where there is appreciable potential difference over the cap. In this application, this would be around the corner point.
Using an elcap of only 4.7uF then would induce distortions too close to the pass band.
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Follow Ups
- Re: You have forgotten something... - Werner 22:48:58 08/21/02 (4)
- Yes, this is the answer I was looking for. Another question .. - Coyote 00:55:23 08/22/02 (1)
- Re: Yes, this is the answer I was looking for. Another question .. - Werner 04:02:26 08/22/02 (0)
- Yes, this is the answer I was looking for. Another question .. - Coyote 00:53:49 08/22/02 (0)
- Yes, this is the answer I was looking for. Another question .. - Coyote 00:51:41 08/22/02 (0)
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