P phoibos New Member Feb 21, 2010 #1 **broken link removed** **broken link removed** **broken link removed** what is the usage of power amplifiers in these 3 circuits? Thank you. Last edited: Feb 21, 2010
**broken link removed** **broken link removed** **broken link removed** what is the usage of power amplifiers in these 3 circuits? Thank you.
audioguru Well-Known Member Most Helpful Member Feb 21, 2010 #2 The 10k ohm variable resistor provides a very low current. The power amplifier amplifies the low current so that the voltage from the variable resistor is not loaded by the load.
The 10k ohm variable resistor provides a very low current. The power amplifier amplifies the low current so that the voltage from the variable resistor is not loaded by the load.