My Chip-amp Designs - Showcased

[nuteronix]

I needed a few audio amps and they didn't have to be anything fancy,
and since chip-amps were small and readily available,
I decided to use them for all my projects.
This will consist of TDA2822, TDA2003 and TDA2005.

I weren't too happy with the designs i got from an online search engine,
so i decided to just construct my own designs.
This allowed me to include various things like Volume Ctrl, Line-In,
Spkr-Out and Power Connectors directly on the PCB in a logical layout
without restricting Heatsink area.

These amps are so basic that they can be used for any small audio application needed,
and can easily be replaced with bigger or smaller amps if needed.
They'll also run off any 3v-12v power adaptor, or even vehicle battery power.
I implemented Grounding principles like star-earthing where possible.
All the PCB's Connectors follow the same logical layout, making it easier to design an enclosure around them.
I realise they can be improved in so many ways, but the point was to keep it as simple as possible.
They all work great, but if you personally feel you need to change anything in their design, feel free.
These amps will also make a great first project for any electronic hobbyists!

I've created the following amp designs using Eagle Lite, since it's freeware and quite easy to learn.
By defualt, the design only displays the bare cct in "board view",
so just enable the necessary layers for component values and pinouts.

Enjoy! -nuteronix

[nuteronix]

The TDA2003 Single Channel

[nuteronix]

The TDA2005 Bridged Channel

[nuteronix]

The TDA2822 Bridged Channel

[nuteronix]

The TDA2822 Dual Channel

[nuteronix]

all completed amps

[Taco]

Wow, nice projects, how do they sound?

[nuteronix]

Hey thanks Taco, any feedback or comments are appreciated

As most chip-amps are, they did tend to sound slightly harse innitially for the first few hours of playback, so after i had them playing for a few days, i did the following to some of the amps:

For the TDA2003 i changed R4 from 2.2ohm to 12ohm.

For the TDA2005 i changed R6 & R7 from 12ohm to 68ohm respectively.

Although these amps had no oscillations, increasing the values of the feedback resistors caused their sound to be less harse and reduced overdriving the amps to clip or distort at high output levels.

the TDA2822 amps do tend to heat up quite a bit (for their size) when driven hard , but nothing a small heatsink with thermal glue cant fix. I also added dip8 sockets for easy IC replacment of them.

[nuteronix]

-Numbering of the components a bit easier to view by placing it under them.
-Placed the values of the components on the side of the board.
-I fine-tweaked some PCB tracks in one of the designs.
-Placed some drill-holes on the side of the PCB's.
-Placed junctions into the schematic view for the components.

PS. I've compiled all of them into one package this time.