D718 B688 Amplifier DIY Powerful Ultra Bass

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In the following video I am showing, a way to make an extremely powerful ultra bass class-A D718 B688 Amplifier DIY

I tested the circuit with 35 volts dc dual power supply. However you can use 12 volts to 35 volts dc. I used 4 ohms 35 watts audio speakers which provided greater sound.

Circuit Diagram

used in D718 B688 Amplifier DIY

Following is the Circuit Diagram of D718 B688 Amplifier DIY Powerful Ultra Bass.

Development images

of D718 B688 Amplifier DIY

Step-1
Following image shows an initial setup of five audio section transistors. They are just fixed on a piece of card board temporarily.

Step-2
Kindly make connection according to the circuit diagram which is already provided in this article. Just click the image and then click the download button and you can have in your computer.

Step-3
Take five pieces of D718 NPN transistors, five pieces of B688 PNP transistors and tighten them on a solid large heat sink with mica (rubber insulation) as shown in the following image.

Step-4
Join all collectors of all five B688 transistors together and also join all collectors of D718 transistors together.

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List of Components

• D718 Transistor x 5
• B688 Transistor x 5
• A733 transistor x 2
• C945 transistor x 1
• A1013 transistor x 1
• C2383 transistor x 1
• 100uf / 25v Capacitor x 2
• 4.7uf / 50v Capacitor x 1
• 0.33 ohms / 5 watts x 10
• 10 ohms / 1 watt x 10
• 10 ohms Resister x 1
• 330 ohms Resister x 1
• 3.3k Resister x 2
• 10k Resister x 1
• 22k Resister x 1
• 33k Resister x 1
• 1N4007 Diode x 2
• 50k Potentiometer Single Pole x 1
• Heat Sink x 1
• Power Supply 35v-0v-35v DC Dual Voltage
• Speakers 4 Ohms