My LM3886T-based Audio Amplifier

Close Up View of the Amplifier
Close Up View of the Amplifier

Here’s my attempt at making a stereo LM3886T-based amplifier a couple of months ago, back in 2010. The gainclone gives a very good sound quality. It is like dead when the input signal is absent, no hum, hiss or any other noise. What you see below is the front view of my amplifier. You can see the amp on the left side along with an analogue meter, and the switching power supply on the right side of the picture. I also added two tweeters on the desk wood for more high frequency response.

Front View of the Amp and PSU

Front View of the Amp and PSU

Top View of the Amp

Top View of the Amp

This is the top view of the amplifier. It is a stereo (dual mono) LM3886 IC-based amp fed with 20V Center-tapped Switching Power Supply. A pot is added point-to-point for the sake of completeness, as it is turned all the way up. The PCB is 2mm thick, obtained from a local seller for US$16.20, sent overseas from China I think.

Close Up View of the Amplifier

Close Up View of the Amplifier

The ICs were obtained from a local supplier for $3.80 each. El-Cheapo stuff eh? 😀 All the components came pre-assembled and pre-soldered with the PCB, so I just needed to solder both ICs to make a working amplifier.

Switching PSU for the Amplifier

Switching PSU for the Amplifier

This is a side view of the Switching Power Supply used to give some juices to the amp. It was made a long time ago I can barely remember when :-p Anyway, it accepts +12V input voltage from either another 220V-12V Switching PSU or an automotive battery as a backup power. P.S: I know the efficiency drops, but I like the idea of powering amp from batteries in case of blackout.

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  • Where did you get the pre-assembled boards? I have an old PA system, the pre-amp circuit board works fine but the power amp is toast. It runs on the LM3886T Op Amp. I replaced the op amp because I could visually see that it had a crack and was smoking, but now it fries speakers. I would rather replace it if I could.

  • Well, if the IC keeps on smoking, may be you’d want to check the power supply section first 😉