Tag Archives: audio amplifier


A DIY mono class D amplifier

The PAM8610 is a 10W stereo Class-D audio amplifier chip available in a 40pin QFN 6mm*6mm package. The PAM8610 runs off a 7V to 15V supply at much higher
efficiency than competitors’ ICs and requires a very few external components for operation. You can buy a PAM8610 amplifier breakout board for less than $2 on eBay and Aliexpress. This Instructables described how to use one of those amplifier modules along with a pack of rechargeable lithium battery to drive a 4″ speaker delivering ~15W of output power. The instructable describes also describes how to connect a charging circuitry for the lithium batteries for enabling charging through a universal micro USB charger.

A DIY class D mono audio amplifier

A DIY class D mono audio amplifier

This amplifier is a PAM8610, a dual amplifier capable of 15 watts per channel in a very small form factor which runs at 12v DC. As we are only going to use one output, we dont have to care about overheating issues (Anyways, the chip has high temperature detection, so even better).

In this step we only are going to solder the aux port to the board with two wires. The middle lead of the aux port is usually GND, so connect it where it says GND on the amplifier board (should be very close to the left and right channel inputs on board). Then conect either lead of the aux input to either channel input on the board. If you feel, you can solder some wires to the power in on the board (where it says +12v and gnd).

 

Stereo audio amplifier using TEA2025 chip

While LM386 is the most popular audio amplifier IC among hobbyists, it provides the limited output power of only 1 Watt, and for stereo application, two LM386 ICs are required. This project is about making a 5 Watt stereo audio amplifier using the UTC TEA2025 IC chip.

Stereo audio amplifier circuit enclosed inside a plastic box

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LM386 based stereo audio amplifier with digital volume control

Due to its simplicity (requires minimum external components) and high availability, LM386 is very popular among hobbyists for use in low-voltage audio amplification applications. Most of the time a potentiometer is used at the input side of LM386 to provide a volume control in the output speaker. The potentiometer does not control the gain of the amplifier itself, but it creates a voltage divider network at the input, which in fact controls the fraction of the audio signal that is fed to the amplifier. This project is about a stereo audio amplifier using two LM386 ICs with digital volume control for both left and right speakers. So, how would you control the volume digitally? You are right, by replacing the traditional electro-mechanical form of potentiometers with digital potentiometer chips. This project uses MAXIM’s DS1868 dual digital potentiometer chip and a PIC microcontroller to control the volume of a stereo output from two LM386 ICs.

Stereo audio amplifier with digital volume control

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