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Re: how can I know or calculat my amp feedback ?

162.119.232.100

Posted by steven oda on September 11, 2003 at 04:53:22

In Reply to: how can I know or calculat my amp feedback ? posted by lovetube on September 10, 2003 at 23:42:29:

LT,

ROUGHLY... take the resistance off the secondary output transformer. Now, divide this by the resistance of the resistor from the voltage divider point to ground.

For example, if the feedback resistor is 4700 k-ohms and the resistor from ground to the divider point is 150 ohms:

(4700)/(150) = 31.33. So if the speakers "sees" 34.0 volts---31.33 volts will be dissipation and lost by the feedback resistor and 2.67 volts will present at the divider point.

In general, the greater the resistance of the NFB resistor the more voltage off the secondary winding is absorbed. And the less amount is available for feedback control, at the divider point. And vice-versa.

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Analog Engineering Associates

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