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Old 14th May 2013, 03:22 AM   #21
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I upload my circuit diagram,can it is appeared?
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Old 14th May 2013, 09:28 AM   #22
Mooly is offline Mooly  United Kingdom
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Old 14th May 2013, 09:29 AM   #23
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this is circuit picture.I means is when mute control switch to left,Q1 can turn-on slowly.And ,the signal on LineInp1 fade out.
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Old 14th May 2013, 09:31 AM   #24
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Thank you! There are two Submit Reply button in reply page,I must to press below one.
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Old 14th May 2013, 09:33 AM   #25
Mooly is offline Mooly  United Kingdom
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Like this.
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File Type: jpg Capture.JPG (41.1 KB, 55 views)
File Type: jpg Capture2.JPG (39.8 KB, 48 views)
File Type: jpg Capture3.JPG (108.4 KB, 47 views)
File Type: jpg Capture4.JPG (120.8 KB, 46 views)
File Type: jpg Capture5.JPG (73.6 KB, 11 views)
File Type: jpg Capture6.JPG (101.8 KB, 7 views)
File Type: jpg Capture7.JPG (46.2 KB, 7 views)
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Old 14th May 2013, 09:40 AM   #26
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Old 14th May 2013, 09:43 AM   #27
Mooly is offline Mooly  United Kingdom
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Your welcome
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Old 14th May 2013, 09:47 AM   #28
Mooly is offline Mooly  United Kingdom
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I'm not so sure the transistor would fade the signal as you want. It would tend to conduct fairly quickly as the base-emitter junction come into conduction probably introducing a lot of audible distortion in the transition period. Even FET's do that to some extent.

C5 and C7 are far to big. If you need them at all then somewhere around 10 to 47pf is suitable.

Edit... and C6
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Last edited by Mooly; 14th May 2013 at 09:49 AM. Reason: More info
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Old 14th May 2013, 11:06 AM   #29
godfrey is offline godfrey  South Africa
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Originally Posted by rochest126 View Post
this is circuit picture.I means is when mute control switch to left,Q1 can turn-on slowly.And ,the signal on LineInp1 fade out.
When the mute control is switched to the right, it short circuits the 10uF capacitor. The high current can cause a small arc in the switch. After many switchings, the switch contacts may be damaged.

It may be better to move the 10K resistor like this:
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Old 14th May 2013, 11:15 AM   #30
godfrey is offline godfrey  South Africa
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Originally Posted by Mooly View Post
I'm not so sure the transistor would fade the signal as you want. It would tend to conduct fairly quickly as the base-emitter junction come into conduction probably introducing a lot of audible distortion in the transition period.
Yes. An LDR (light dependent resistor) would be better for fading.
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