B688 DIY Bass Amplifier With Bass Volume Homemade

In this video B688 DIY Bass Amplifier, i’m showing, a way to make a powerful bass class-A effective amplifier where a magnetic coil is also used to provide better and clear output to speaker.

I proven the circuit with 12 volts dc power supply. However you may use 12 volts to 18 volts dc. You must use a solid and large heat sink. I used four ohms 35 watts audio speakers which furnished more sound.

Circuit Diagram

Following is the Circuit Diagram of B688 DIY Bass Amplifier with bass volume controller. The circuit gives nice sound quality with heavy bass. It uses minimum components and its ideal for beginners and learners.

Click on the image to open it in a light box then click the “Download” button to download the circuit diagram into your computer for future use.

More Circuit Layouts

List of Components used in B688 DIY Bass Amplifier

• B688 Transistor x 1
• 104J Ceramic Capacitor x 2
• 220uf / 16v Capacitor x 1
• 1k Ohms Resistor x 1
• 50k Potentiometer Single Pole x 1
• Heat Sink x 1
• Power Supply 12v
• Power Supply Pin/Socket
• Mobile Audio Jack Pin
• Speakers 4 Ohms

Development images

used in B688 DIY Bass Amplifier

Step-1
Take one piece of B688 NPN transistor and fix it on a heat sink as shown in the following image.

Step-2
Now solder a 1k resister between collector and base of B688 transistor.

Step-3
Take a 220uf electrolytic capacitor and solder its positive side to the base pin-1 of B688 transistor for audio input.

Step-4
Now take a magnetic coil and connect its one end to collector pin-2 of B688 transistor and the other connect with one end of terminal block of speaker. Now join the center two pins together for ground, as shown in the following image.

Step-5
Take a piece of red wire and solder its one end to emitter pin-3 of B688 transistor and the other end of wire to the last pin of terminal block for power supply positive.

Step-6
Now take two pieces of 104J ceramic capacitors and join their one end together, as shown in the following image.

Step-7
Fix one 50k potentiometer on the board. Now solder one end of 104J ceramic capacitors to pin-1 of pot and the other end to the body of the pot, as shown in the image below.

Step-8
Other end of 104J ceramic capacitors is clearly shown to the body of pot in the image below.

Step-9
In the following image, I am showing pin-3 of potentiometer is being connected with the body of pot with a piece of a naked wire.

Step-10
Take a piece of red wire and solder its one end with negative side of 220uf capacitor.

Step-11
The other end of the same piece of red wire will be soldered with the center pin of the potentiometer.

Step-12
Red wire is clearly shown in the following image.

External connections

Step-13
Here are the connections of audio input jack in the following image.

Step-14

Step-15
White speaker wires are connected in the terminal block in the following image.

Step-16
Red & Black power supply wires are being inserted into the terminal block.

Step-17
The circuit is complete. Now enjoy the music.

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