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Old 2nd November 2012, 03:40 PM   #11
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Eye candy is all I need for this one. Thanks for the info.

Originally Posted by Mooly View Post
Or we can be safe in the knowledge of our designs and use a term coined by Rolls Royce,

Power output is 'undisclosed' but 'entirely sufficient'.

I think meters are more eye candy than anything else... and having said that my amp has them as you know and yet in practice they never move off the end stops for 95% of my listening (that's the lower end if you are wondering )
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Old 2nd November 2012, 09:27 PM   #12
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I think something simple like this would follow the signal strength and provide the aesthetic sweetness. Just change the bridge to a single-diode halfwave in series with the meter, and modify component values for your app.
This from the R. Graf & W. Sheets op amp article at their North Country Radio website:
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Old 3rd November 2012, 12:09 AM   #13
sreten is offline sreten  United Kingdom
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Without "peak hold" a volts into 8ohms meter is pretty useless for music.

Peak hold is the only useful meter indicator for amplifiers, though a nice
addition is flashing LED that genuinely flashes with > 1% to 3% distortion,
(by genuinely comparing the input to output so loading issues are included).

Even with peak hold it needs to be in dB to not spend most of the time
doing nothing interesting, even "eye candy" has to properly designed
to do what you want it to.

rgds, sreten.
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Old 3rd November 2012, 12:50 AM   #14
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For wattage, couldn't you use one of those calibrated "current sense" resistors you can get (very low ohms, it would hardly affect the output) and an output voltage sense, both through rectifiers and smoothing,

Then multiply them with an analog multiplier chip (AD534) or make a multiplier with op amps, when the current lags behind the voltage, that would not need to be calculated since it is measuring them both separately.

it would be fairly cheap to make, but probably take quite a bit of time to design. maybe too much work for a chip amp.
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Old 3rd November 2012, 05:41 AM   #15
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I was in a hurry and wasn't thinking... no changes are needed to the rectifier. d'oh! (Though halfwave vs fullwave response differences may be interesting.)
The OP has written "aesthetic" and "eye candy" several times already. He can correct me if he needs more than just a meter movement in sync with the audio output.
It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

Last edited by sofaspud; 3rd November 2012 at 06:11 AM.
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