I had to many old speakers at home and would like to convert them in a compact mobile phone amplifier.

For this project you need :

_ Two old speakers free

_ AC/DC 12V 3A 6$

_ PAM8610 amplifier 6$

_ Jack cable 2$

_ main cable reused free

So all of it for less than 15$ and a bit of time.

Step 1: Amplifier

I used the PAM8610 board for amplifier.

It is a 12V 2x10W Amplifier and not 15W as said on the seller website.

10W @ 10%THD/Channel Output into a 8Ω Load at 13V

Low Noise: -90dB

Over 90% Efficiency

With Shutdown/Mute/Fade Function

Over Current , Thermal and Short-Circuit Protection

Pop Noise Suppression

To improve it I add a 4700uF cap on the 12Vdc input, and you can change the cap output to MKP instead of X7R.

Step 2: AC/DC 12V

To supply the amplifier I used a 12V 3A output AC/DC converter.

12V * 3A = 30W so it will be ok for the 2 * 10W output of PAM8610.

I never used the AC/DC at full power to avoid pushing it to much.

On top of that you can add a main 220V filter to protect it.

Step 3: Assembly

I removed the old speaker from the first cabinet and add it to the other one.

I drill too holes on the right face of the cabinet, one for the tweeter and one for the subwoofer.

I solder a switch between the AC/DC converter and the main cable 220V, and connect the 12V AD/DC output to the PAM8610 12V input. I connect both speakers Right and Left to the amplifier, and finaly a jack input.

I add a loud noise from the amplifier so i connect the earth(not neutral) to the ground amplifier, and noise desappear.

Step 4: Result

About This Instructable




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