sample and hold circuit

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outer_space
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Posted by outer_space: Tue. Oct 21, 2014 - 02:07 PM
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I have a DAC that can go 30kHz, has 1 output only.  What would it take to output in stereo at 15kHz?  Would it work out output both stereo channels on the dac and use a sample and hold circuit?  I was thinking 2 caps with pfets that alternate the dac output between the 2 channels.  I figured someone here has done this before.

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Torby
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Posted by Torby: Tue. Oct 21, 2014 - 04:53 PM
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Try here: http://lmgtfy.com/?q=sample+and+hold+circuit

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theusch
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Posted by theusch: Tue. Oct 21, 2014 - 06:19 PM
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I was thinking 2 caps with pfets that alternate the dac output between the 2 channels.

MCP4921, single channel:  $2.10/qty. 1; $1.50/qty. 100

MCP4922, dual channel:  $2.75/qty. 1; $2.00/qty. 100

 

So, for less than $1 to add the second channel and no additional switching parts, is your quest worthwhile?

 

I'd guess that you can get stereo audio amps also in that $2 range.

 

Chan did a stereo sound player with just a Tiny85:

http://elm-chan.org/works/sd8p/r...

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awneil
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This reply has been marked as the solution. 
Posted by awneil: Tue. Oct 21, 2014 - 06:24 PM
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Just feed mono to two speakers - 98% of people won't notice the difference...

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Torby
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Posted by Torby: Tue. Oct 21, 2014 - 09:02 PM (Reply to #4)
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awneil wrote:

Just feed mono to two speakers - 98% of people won't notice the difference...

 

You know me too well.

The largest known prime number: 282589933-1

It's easy to stop breaking the 10th commandment! Break the 8th instead. 

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