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Old 21st February 2007, 10:18 PM   #1
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Default Auto power-on signal sensing circuit

I recently bought a Parasound amp with a signal-sensing automatic power turn on function. I have become thoroughly spoiled by it, I must admit. The problem is that I now want to use a DAC between the signal and the amp. Of course, the DAC must be turned on the old fashioned way.

Does anyone have knowledge of how an auto turn-on feature could be added to the DAC? Any information is much appreciated.

Steve
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Old 22nd February 2007, 02:44 AM   #2
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I've never made one, but perhaps using a microcrontroller with ADC and a relay this could be done. The micro would sample the signal input and once some programmed threshold is met, it would trigger a relay circuit.

Stu
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Old 22nd February 2007, 11:46 AM   #3
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Quote:
Originally posted by maczrool
I've never made one, but perhaps using a microcrontroller with ADC and a relay this could be done. The micro would sample the signal input and once some programmed threshold is met, it would trigger a relay circuit.

Stu
Somewhat overkill there

A bridge rectifier, long time constant R / C network and a transistir driven relay is all that is needed.
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Old 22nd February 2007, 07:59 PM   #4
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Not really overkill just different. A simple 8 pin micro with internal oscillator would do fine and might even cost less than an RC + bridge.


Stu
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Old 22nd February 2007, 11:39 PM   #5
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I would be surprised if it was actually cheaper.
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Old 23rd February 2007, 10:04 AM   #6
deandob is offline deandob  Australia
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Here you go:

http://sound.westhost.com/project38.htm

Regards,
Dean
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Old 23rd February 2007, 10:44 PM   #7
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Dean, thanks very much!

Steve
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