voltage

Hi all

I need some help with a voltage that I need to keep at 0.741volts for stability. As I power the detector on this voltage is 0.687 volts and slowly creeps up to 0.854 volts this is causing me to have to retune all the time so I thought of using a comparator but I'm not too sure on how to go about it can any one please help me?

Regards Xavier

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The thing is that it controls the audio part of the detector see when metal if passed under the coil the voltage must go up then back to 0.741 volts if I use a regulator this will not happen in fact one can look at it as a ground balance set up.

Xavier

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		Quote:			Posted by xavier
	The thing is that it controls the audio part of the detector see when metal if passed under the coil the voltage must go up then back to 0.741 volts if I use a regulator this will not happen in fact one can look at it as a ground balance set up.

I think Mudflap is still on to something.  Bias the regulator with an op amp that has a constant input and your audio input at the two sources.  This will let you maintain a baseline voltage that rises when needed.

-MM

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hi xavier     the zinar diode use to Stabilization the volte at point you want by adding

               the value of zd= o.6 + 0.687 = 1.287 v
 
               if zd 1.2v or zd 1.3  do you want !!!
   
   j.

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