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Old 6th Dec 2008, 6:21 pm   #2
PJL
Dekatron
 
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 3,511
Default Re: Sound Sales PX4 Amplifier

56mA in a 47ohm resistor gives 2.6V so it must be a 470ohm. This gives a better dissipation of about 1.5W. The balance control is to match gm. Stick a scope across the 470 ohm, put in a sinewave and adjust for minimum amplitude (an AC meter should also be OK). The DC characteristics of the PX4 are a bit different which will increase distortion at higher volumes but should be OK...Peter
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