Mini High Impedance Amplifier is an amplifier with 1 Watt and have a very high input impedance. The series amplifiers can have a very high input impedance because the use of two transistors in the input that is placed Darlington. Input impedance circuit amplifier achieves 20M Ohm. Mini High Impedance Amplifier circuit uses four transistors and an IC 741. Gain amplifier with high input impedance , we can provide the input signal from device with weak levels though.
Mini High impedance amplifier circuit is very cheap to make and quite simple. This amplifier circuit use 9VDC power supply.
