Custom Speaker and Headphone Amplifier

[Blargaman91]

This is my first custom PCB, and I made it because I can never find a very good audio amplifier to use in my portables. Here are some features of the board:

- Stereo analog input
- 2 W speaker output
- 150 mW headphone output
- Digital volume control (up and down buttons)
- 3.3v/5v power supply

One setback about the amplifier IC I used is that volume control must be done through serial communication (I2C), so I added a tiny microcontroller. That allows me to have up and down buttons for 32-step volume control. The amplifier detects headphones via a sense pin, and it switches between either speaker or headphone output.

There's no silkscreen yet but it's basically a finished product. My next version of the board will have all the labels and such.

 

[lyberty5]

It looks tiny but the functionnalities are great

Dis you have to order a whole bunch or can you commission pcbs like this in small orders?

Nice job

 

[Blargaman91]

I can make just a few at a time. I got the PCBs from OSHpark, so the minimum order is 3.

 

[samjc3]

It looks very pretty. How big is it?

 

[Blargaman91]

Thanks! The board is 21mm X 24mm. I wanted to make it small so it works well in small portables.

 

[samjc3]

Awesome. I don't currently have a use for it, but if I ever get off my ass and build one of the things I talk about, flax.