Power Amplifier 300W

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

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
R28,29,30,31= 100ohm	C13-16= 100nF 250V polyester	*Use R23=6k8 for 4 ohm loudspeakers