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ultima2009

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  1. Maybe you are talking about the 0.47 ohm/10W resistor R7 that senses how much output current?
    If you change it to only 0.1 ohms then the current regulator parts also must be changed. The input offset voltage of opamp U3 must be nulled to compensate.


    how calculate  the current regulator parts? and i can"t set the null with trimpot and resistor between pin 1 and pin 5 of the opamp. Opamp - TLE2141, trimpot - 4.7k and resistor 1k, output voltage is change from 22mV to 33mV.. maybe i need to increase or decrease the value of resistor (1k)?
    Sorry for my english, iam fron russia :)
    Thanks
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