Position: Index > Amplifier Circuit >

Power amplifier 60w [2]

2015-01-01 17:49  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.
 

Simple Power amplifier 50W in 8 ohm [2]

Power_amp_60W_a.gif (15436 bytes)

 ??? ??????? ??????? ???? ????? ????????? ?????? 60W ??? 8? ??? 80W ??? 4?, ?? ????? ??? ??????? ???????? ?? ??????? ?????????. ?????? ?? ?????????????? ?? ????????? ???????? ?????????????? ? ?? ????? ???????. ??????????? ??? ???? ???? ?????????. ?? ?? TR1 ?????????? ??? ?????? ???? ???? ????? ??? ???????? ?? ?????? ??????? [?20 ????50mV ????? ??? ???? ???????]. ???? ?????? ????? ?? ??? ?????????? Q1-2 ??? ?????????? ????????, ?? ????? ??????????? ??????????????. ?? ?? TR2 ?????????? ?? ????? ??????? ??? ?????????? ??? ??????? ?????? ??? 50mA ??????? ??? ???? ?????. ? ??????? ???? ??????? ????? ?? ??????? ???? ???? ??????, ??????????? ??? ????????? ??? ???? ???? ??? ??????????? R22-23-24-25 ??? ??????????? ?? TR2 ?????? ?? ?????? ??????? ??????? 25mV DC, ??? ??????????? ?? ????? 50mA. ???????? ??? ???????? ?? ???????? ??? ???? ??? ??? ??? ????????? ?????????? ????. ?? ?????????? Q6 ??? Q12, ?????? ?? ???????????? ????? ?? ??? ???? ??????, ?? ??????? ???? ?? ???????? ???? ??? ??? ?????? ??? ??? ????? ????????.

 In the circuit exist a simple power amplifier 60W in the 8 ohm and 80W in the 4 ohm, with components that sure exist in big quantities. It can be used in home cinema systems or in other uses. With the TR1 we regulate the DC voltage in the output of amplifier in low levels [?20 until?50mV it is a good level]. Good also they are the two transistors Q1-2 of differential amplifier, they have matched characteristically. With the TR2 trimmer we regulate the transistors bias current of output power stage, in 50mA roughly for each sector. This regulation become without exist signal in the input, place a digital multimeter in terminal since of the resistors R22-23-24-25 and regulating him TR2 should we have clue, roughly 25mV DC, that corresponds in current 50mA. We leave the amplifier to work for few hour and if it needs we regulate again. Transistors Q6 until Q12, should be placed on a good heatsink, with attention so that insulation well from the heatsink and the support screws.

Part List

R1=1.5KohmR21=10ohm1WD1=5V6 0.4W zener
R2-9=10KohmR22-23-24-25=0.47ohm5WQ1-2-3=BC557
R3=2.7KohmTR1=100ohmtrimmerQ4-8=BD140
R4=5.6KohmTR2=470ohmtrimmerQ5-7=BD139
R5=3.3KohmC1=2.2uF 100V MKTQ6=BC549
R6-12=470ohmC2=330pFQ9-10=TIP2955 [MJE2955]
R7-11=1.2KohmC3=100uF 16VQ11-12=TIP3055 [MJ3055]
R8=560ohmC4=100pF
R10=220ohmC5=27pFF1-2= 3A slow Fuse 5X20mm
R13-14=47ohmC6=3.3nF 100V MKT
R15-16=33ohm1WC7-8-9-10-13-14=100nF 100V MKTAll resistors is 1/2W 1% metal film except for announce differently
R17-18-19-20=220ohm1WC11-12=220uF 63V

 

]


Reprinted Url Of This Article:
http://users.otenet.gr/~athsam/power_amplifier_60w_2.htm