Power Amplifier

There are possible alternative input stage transistors, the Toshiba 2SA970BL and 2SC2240BL, which appear to be good substitutes for the Hitachi 2SA1085E and 2SC2547E. The ‘BL’ suffix is the high gain group. Alternatives for the Sanyo 2SC2911 and 2SA1209 are the Toshiba 2SC3423 and 2SA1360. 70W Mosfet power amplifier Circuit Diagram This 70W power amplifier is designed for quality rather than quantity, and if much higher power is really needed there are other more suitable design approaches. This is an awesome amplifier circuit, and this is the older version�(MJR7-Mk3). There is new version released (MJR7-Mk5) for better quality and performance, just go to THIS PAGE for complete circuit explanation. source

This 5.1 surround amplifier circuit schematic use the IC AN7168 as the main component from this circuit . Minimum voltage required 12V and maximum voltage 24V , I recomended it 12 V because the voltage support on are components. But if you want to better a loud sound you can raise it.  Maximum power output 40W with impedance 4 ohm . This 5.1 surround amplifier circuit schematic also support to make surround sound or 5.1 speaker. Use this amplifier on rear speaker , left right , and center but dont use to subwoofer speaker. See 5.1 surround amplifier circuit schematic below : Click to view large If you want to make a 5.1 surround sound you must make 5 the circuit of 5.1 surround amplifier circuit schematic , for left and right speaker , rear left and right speaker , and center speaker. Use the subwoofer speaker with support amlplifier subwoofer circuit .

Circuit combination of the 3 IC TDA2822  above can be used for 5.1 audio power amplifier system with low power output . The input signal used is analog signal not digital (SPDIF) , so it needed some input to the jack input. The speakers are suitable for use have impedance 8 Ohms , and with power 4 Watt, to Left , Right , Rear pair , center , and subwoofer speakers. To run this circuit , is also required circuit for volume control as tone control . Component and technical Information : C1-C6 : 220uF/25V C7-C9 : 47uF/16 V IC       : TDA2822 x3 CON-1: VCC +12volts DC CON-2: Ground CON-3: Left Speaker CON-4: Right Speaker CON-5: Rear Speaker CON-6: Rear Speaker CON-7: Center Speaker CON-8: Subwoofer Speaker X1-1:Ground X1-2:Subwoofer Input X1-3:Center Input X1-4:Rear Input X1-5:Rear Input X1-6:Right Input X1-7:Left Input See this Printed circuit board below: circuit and PCB Design use Cadsoft Eagle Software

IC LM386 is working for the amplifier audio circuit with a low power output , range from 0.325 watts to 2 watts with impedance 8 ohm. In this circuit requires voltage of 12 volts to the maximum work, and maximum current 3 Amp. Components List : R1=33K / 0,25W R2=1K / 0,25W R3=10R / 1W C1=100n C2=0,1uF/35V C3=100uF/16V C4=220uF/35V C5=4,7uF/16V IC1=LM386 Connector Instruction: X-1  = Input , connect to output X-2  = Input Ground X1-1= V+ , 12 Volt DC X1-2= V-/ Ground X1-3= Speaker+ X1-4= Speaker-

This is OCL 150 W mono audio amplifier circuit , with impedance 8 Ohms. The supply voltage using 25 volt DC with triple voltage + ,- ,ground. see below this circuit : Buffer amplifier use PNP transistor is A564 / A733 /A1013 and NPN use D400 / D438. Driver Amplifier use NPN transistor is TIP31 / TIP41 / D401, and PNP transistor use TIP32 / TIP42 / B546. For the transistor booster or end , here I use a 2 x 20355 and MJ2955 . This anplifier is recomended to full range speakers. See pcb line and construction audio amplifier below : Click to view larger PCB line Components are already installed The booster amplifier already installed.