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Class D Switching Power Amplifiers and Power D/A conversion

Easiest turn on/off pop fix
Easiest turn on/off pop fix
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Old 13th September 2016, 09:37 PM   #1
Mortenhoe is offline Mortenhoe  Denmark
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Default Easiest turn on/off pop fix

Found an EASY way to get rid of both turn on and off pop with only one relay. This ofcourse relys on the amp being turned on and off by mains.

I have a 240V operate on delay relay connected to mute
5 sec after the amp is turned on mute is disabled. When amp is turned off the relay drops and enables mute again before the PSU runs out of juice.

This is my build in progress. Still need to add last 2 Sanwu boards for biamping and a DAC.
Click the image to open in full size.
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Old 14th September 2016, 07:37 PM   #2
zakman35 is offline zakman35  Mozambique
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Clever.
but how you set the 5 sec delay?
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Old 14th September 2016, 07:41 PM   #3
Mortenhoe is offline Mortenhoe  Denmark
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This is a multi function relay set to "operate on delay". It has a second dial.

Any delayed relay will do the trick. All I've ever seen has a time dial.
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Old 14th September 2016, 08:16 PM   #4
zakman35 is offline zakman35  Mozambique
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How you do control the first relay (main power on/off)?
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Old 14th September 2016, 08:19 PM   #5
Mortenhoe is offline Mortenhoe  Denmark
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That is a 5V relay. Turns on when I turn on the television. USB :-)
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