How to Make D718 And B688 Stereo Audio
Amplifier Easy Circuit
Use of Audio Amplifiers
Audio amplifiers are circuits used to Convert low audio signals from mobile or other devices to high power Audio signals for drive Speakers Subwoofer or Headphones
Easy way to make powerful audio amplifier without ic circuit without PCB
How to Make Audio Amplifier
Circuit Diagram:
What is Stereo Audio Amplifier
Stereo Audio Amplifier is two Channel Amplifier Mean It Receive Two low power Left and right Signals and convert into High Power Signals for Left and Right Signals you can say Stereo are two Amplifiers one for left speaker and Second for right.
Some Pictures Steps may help you:
D718 Amplifier Transistors
NPN
B688 Amplifier Transistors
PNP
1000uf dc Capacitors any voltage
150 Kilo Ohms Resisters
Heat sink for four Transister
Some Heatsinks are Conductive So use Paper as emulsion
Arrange Transistors Like This Pattern
1st B688 2nd D718 3rd B688 4th D718
See in Picture Transistors Pins
Base Collector Emitter
Attach 150K Resister to 1st B688 Emittor to 2nd D718 Base
same
Attach 150K Resister to 3rd B688 Emittor to 4th D718 Base
Like Picture
Join 1st B688 Base to 2nd D718 Collector
Join 1st B688 collector to 2nd D718 emitter
Same
Join 3rd B688 Base to 4th D718 Collector
Join 3rd B688 collector to 4th D718 emitter
Attach Capacitor + terminal to 2nd D718 base
same
Attach Capacitor + terminal to 4th D718 base
audio in Cable pins Diagram
Left Right Gnd
Attach Left orange 2nd D718 Capacitor - terminal
and
Attach Right White 4th D718 capacitor - terminal
and
Attach GND Blue to 4th D718 emitter
Like picture circuit Diagram
joint 2nd D718 emitter with 3rd B688 collector
Like a Diagram
See diagram Connect 4-8 ohm Speakers to the amplifier
Joint Speakers + + Wires
and connect 1 negative speaker wire to first b688 emitter
and connect 1 negative speaker wire to Second b688 emitter
Input Wires
Connect + input Wire to speakers jointed positive point+
and
Negative Input wire to Last D718 Emitter point
Input voltage 6volt to 12 volt
Components Guide
1. D718 ( 2 , pcs ) you can also use any other Powerfull amplifier Transister Like ( C5200)
2. B688 ( 2, pcs ) you can also use any other Powerfull amplifier Transistors Like ( A1943)
3. 150 Killo ohm Resisters ( 2pcs) also use 100 Killo ohms Resisters
4. 1000uf capacitor also use any other values Capacitors ( 470uf - 2000uf)
5. three-pin audio input Cable
6. Heatsinks for the transistor to protect from overheat
7. Speakers 4 - 8 ohms
8. input supply 6-12 volts
Sound is Great pls make according to the circuit diagram if the circuit
not work or any vibrating sound
Check audio in cable and Transistors
not give high voltage power supply it can damage your Speakers
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Thanks
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