power amp 300W

High Power Amplifier 300W

Power_amp_300W.gif (32339 bytes)

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For many application there's no substitute for sheer power- low efficiency speakers, outdoor sound systems, or maybe you like the full flavour of the dynamic range of a high power amp. Whatever your requirement-this super power module should fit the bill. How it works: The amplifier can be divided into three separate parts. These are : the input stage, which consists of Q1-Q9 , a high gain, low power driver; the output or power stage- witch only has a voltage gain of four but enormous power gain; and the power supply. The input stage is a complementary -differential network, each ''side'' with its own current source. Each transistor in this stage is run at a collector currant of about 0.7mA. Emitter resistors are employed to stabilize the gain and improve linearity. The output of Q1-Q5 drives Q7 and Q9. The latter are virtually two constant-current sources run about 7mA collector current. With an input signal these ''current'' sources are modulated out of phase - the collector current of one decreases while the other increases. This configuration provides quite an amount of gain. In between the bases of these two transistors is Q8, the thermal sensing-bias transistor. The voltage across Q8 may be adjusted by TR1, thus setting the quiescent bias current for output stage. The output stage, Q10-Q11, Q13-Q14 and Q16-17, has a gain of about five, set by R44 and R28 plus R29. Diodes D4 and D6 prevent reverse biasing of Q10 and Q11 (otherwise the output would be limited). Protection of the output transistors is provided by Q12 and Q15 which monitor both current and voltage in the output transistors and bypass the base current if the limit is exceeded. Frequency stabilization provided by capacitors C6, C11, C12 and the RC networks R31/C10 plus R46/C15. Frequency response of the amplifier is set by C1 and C7 (lower limit), C6 sets the upper frequency limit. If you want use the Protection DC and Balance/Bridge circuits. All the transistors that are inside the interrupted line are placed on an aluminium corner and he screwed on a suitable heatsink. The transistors Q7,Q10,Q11, Q8, Q9, Q13,Q14,Q16 and Q17 placed on this aluminium corner, with suitable isolation from this.[ETI 4/80]

>>>>>>> Here are some more guides to using and setting up the 300W power amp.

Part List

R1-19= 1Kohm 5W	R34-35= 0.1ohm 5W	C14-17= 100uF 100V
R2-3= 4.7Kohm	R36-43= 39ohm	C15= 100nF 250V polyester
R4-5= 22ohm	R37-42= 5.6Kohm 1W	Q1-2-3= BC547
R6-14= 10Kohm	R38-41= 220ohm 5W	Q4-5-6= BC557
R7-8= 1Kohm	R39-40= 0.1ohm 5W	Q7-11-12= BD140 or BC640
R9-23*=10K ohm	R44-45= 0.1ohm 5W	Q8= BC549
R10= 10ohm *see circuit sch.	R46= 4.7ohm 2W	Q9-10-15= BD139 or BC639
R11-13= 2.2Kohm	R47= 100ohm	Q13-14= MJ15004
R12= 22Kohm	C1= 2.2uF 25V	Q16-17= MJ15003
R15-16= 22ohm	C2-6= 330pF ceramic	TR1= 2K2 Trimmer
R17-18= 4.7Kohm	C3-8= 100uF 100V	F1-2= 5A Fuse Fast
R20-25= 390ohm	C4-9= 100nF 250V	D1-3= 5.1V 0.5W Zener
R21= 6.8Kohm	C5= 100nF 100V polyester	D2= 62V/5W Zener or 47v and 15V in series
R22= 4.7Kohm	C7= 100uF 25V	D4-5= 1N4004
R24-26-33= 220ohm	C10= 1.5nF 100V polyester	L1=10 turns diameter 1mm in 15mm diameter tube
R27-32= 100ohm 1W	C11-12= 1.5nF 100V polyester	L1=10 turns diameter 1mm in 15mm diameter tube
R28,29,30,31= 100ohm	C13-16= 100nF 250V polyester	*Use R23=6k8 for 4 ohm loudspeakers

SPECIFICATIONS

	POWER OUTPUT	200W rms/8 ohm
		310W rms/4 ohm
		800W rms/8 ohm (Bridge mode)
	FREQUENCE RESPONSE	20HZ-20KHZ +/-0.5dB
	INPUT SENSITIVITY	1V for 200W/300W
	HUM AND NOISE	-105dB
	THD	<0.1%
	DAMPING FACTOR	65
	.
	Power Suplly For 300W Amp.

OUT VOLTAGE FROM POWER SUPPLY

[+V1]= +68V DC

[+V2]= +15V DC

[+V3]= +68V DC

[-V1]= -68V DC

[-V2]= -15V DC

[-V3]= -68V DC

Power Supply for two Power channel , with Prodection and Bridge circuit (soft start ).

T1= 230V AC/ 2X47V 350VA ................

2X15V 30 VA*

C1-4= 4700 uF 100V

C15= 33nF 630Vac

C5-8= 4700 uF 25V

CX= 33nF 630Vac

T2=230V AC/ 2X47V 350VA

C6-9= 100nF 100V

F1= Fuse 2A Slow

BR1-3=4x1N5404 or 35A Bridge

C7-10= 47uF 25V

IC1= 7815T

RX= 47R 15W

C11...14= 4700uF 100V

IC2= 7915T

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Sam Electronic Circuits 8/01

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