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At this time amplifier circuit based on IC KA2201, TBA820M, LM820M, and U820. You can use all ic is the series under the scheme. This amplifier circuit has a very small output power or low at 2W. Required supply voltage from 3 volts to a maximum of 16 volts. Below is a scheme of this power amplifier Part List R1 = 100K R2 = 120R R3 = 100R C1 = 100nF C2 = 100uF C3 = 470uF C4 = 220pF C5 = 47uF C6 = 100uF IC = KA2201 , LM820M , TBA820M , U820M

Specification : This is stereo amplifier , based on IC TDA4920 , TDA4925 , TDA4930 . Minimum voltage require 9 volts and maximum voltage 13 volts . Maximum power output 2 x 15 Watts with 4 Ohms impedance. Quiescent current 30 mA. See audio circuit scheematic below :

3-channel 80 Watt audio amplifier circuit diagram

Amplifier circuit is also very suitable when used in fm radio receiver. Supply voltage required 8 - 25 Volt DC with a maximum output power 0.15W.See Schematic below. Part List R1 = 100R C1 = 1nF C2 = 4.7uF C3 = 10uF C4 = 100uF C5 = 47uF C6 = 4.7nF U1 = TA7066

HiFi Headphone amplifier HiFi Headphone amplifier

TA7200P has a 3,3 W output and the equation of TA7204P has a power output of 4,2 W , using the circuit above , in  both ic can have 10 watts of output power amplfier , but the quality of each ic remains different. Both ic manufactered by TOSHIBA. Part List : Resistor   = 100K x 2, 820R Capacitor = 1uF , 10uF , 100uF x 2, 4u7F , 820pF , 15 pF , 47uF, 470 uF. IC            = TA7200P / TA7204P Technical information : Max. Voltage = 20 Volt DC Min. Voltage = 10 Volt DC Max. Output = 10 Watt Approx. RL  = 4 - 8 Ohm Approx. Ft   = 30Hz - 18KHz

Below it is a circuit of power amplifiers with power output of 450 watts mono , amplifiers are also frequently used in the amplifier a high-power amplifier, which used in an event, in the field and the placed closed. Because this amplifier suitable for the woofer, fullrange speaker, and can also be fixed for the subwoofer speaker.  To further strengthen and maximize the amplifier ,its power supply circuit also must be accurate, for electrolytic capacitors in power supply ,voltage capacitors use 80V or more, and a capcity 20000uF upwards, so when the bass amplifier is high , the voltage is not lot of experience dropping. Diode bridge use a minimum of 35A, or adjust the current input voltage. If the power supply has fulfilled the desire, the supply to the power amplifier.