ta2020 anti "pop noise" relay - really needed?

yakideo · 17th July 2011, 10:13 PM

Hello,

For the past months I've been designing a pcb for the tripath ta2020. I have read almost all information there is on this particular amp. One thing that however troubles my mind is the so called "pop noise" when turning on/off the amplifier. According to the datasheet the ta2020 has build in "turn-on & turn-off pop suppression". My question, is the build in pop suppression any good or should I invest in a solution involving a relay?

nigelwright7557 · 17th July 2011, 10:27 PM

I cant speak for the 2020 but the irs2092 randomly pops on power off.
For some reason some chips do it and others dont.
The reset circuit is only one capacitor so its hard to get wrong !

Michael Bean · 17th July 2011, 11:32 PM

Don't forget that anything you connect to it's input might also cause pops, so it's a good idea to use anti-pop measures in any case.

Mike

yakideo · 18th July 2011, 12:38 AM

Quote:

Originally Posted by nigelwright7557

The reset circuit is only one capacitor so its hard to get wrong !

What kind of reset circuit are you talking about?

Quote:

Originally Posted by Michael Bean

Don't forget that anything you connect to it's input might also cause pops, so it's a good idea to use anti-pop measures in any case.

A delay circuit would stop the pop noise on power up but what kind of circuit could prevent pops when connecting an audio source?

nigelwright7557 · 18th July 2011, 12:41 AM

Quote:

Originally Posted by yakideo

What kind of reset circuit are you talking about?

The IRS2092 has a capacitor on its reset input.
This sets the time constant for the reset cycle.

Michael Bean · 18th July 2011, 03:28 AM

I was talking about anything connected to an amplifier input will cause noise when it's turned on or off. A way of disconnecting and protecting speakers will prevent that. Take a look at this for ideas.

Loudspeaker Protection and Muting

Mike

17th July 2011, 10:13 PM	#1
yakideo diyAudio Member Join Date: May 2010	ta2020 anti "pop noise" relay - really needed? Hello, For the past months I've been designing a pcb for the tripath ta2020. I have read almost all information there is on this particular amp. One thing that however troubles my mind is the so called "pop noise" when turning on/off the amplifier. According to the datasheet the ta2020 has build in "turn-on & turn-off pop suppression". My question, is the build in pop suppression any good or should I invest in a solution involving a relay?

17th July 2011, 10:27 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	I cant speak for the 2020 but the irs2092 randomly pops on power off. For some reason some chips do it and others dont. The reset circuit is only one capacitor so its hard to get wrong ! __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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17th July 2011, 11:32 PM	#3
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	Don't forget that anything you connect to it's input might also cause pops, so it's a good idea to use anti-pop measures in any case. Mike

18th July 2011, 03:28 AM	#6
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	I was talking about anything connected to an amplifier input will cause noise when it's turned on or off. A way of disconnecting and protecting speakers will prevent that. Take a look at this for ideas. Loudspeaker Protection and Muting Mike

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