This is the project page of my 2004 amplifier project. It is a HiFi amplifier built around two TDA7294. It has got six audio inputs, two line level audio outputs, a headphone output (powered by its own headphone amplifier) and of course two speaker outputs (2 x 80 W @ 4 ohms).
The photos show the following parts in this order:

As you can see, unlike the other boards the controller board PCB is not a prototype board. I wanted to try out etching my own PCBs and this is the result. It actually worked pretty well, but since I am not to fond of working with those nasty chemicals all the time, I didn't do it for the rest of the amplifier boards.


Input selector and pre-amplifier board.

One of the two amplifier boards with a TDA7294.

Both amplifier boards wired up and mounted on the heatsink for testing. The heatsink came out of an old Sony amplifier that had died a long time ago.

Headphone amplifier (again with NE5532A).

All components mounted in the case. The case was taken from an old and broken tape deck.

The finished amplifier on top of a CD/MiniDisc player (remember those? ;).
The photos show the following parts in this order:
- Controller board with PIC16F84A (reads the keyboard for channel selection, mute etc.)
- the pre-amp/input selector board (with multiple NE5532A for amplification and relays for switching inputs)
- the power amplifiers (with TDA7294)
- the headphone amp
- and finally the case

As you can see, unlike the other boards the controller board PCB is not a prototype board. I wanted to try out etching my own PCBs and this is the result. It actually worked pretty well, but since I am not to fond of working with those nasty chemicals all the time, I didn't do it for the rest of the amplifier boards.


Input selector and pre-amplifier board.

One of the two amplifier boards with a TDA7294.

Both amplifier boards wired up and mounted on the heatsink for testing. The heatsink came out of an old Sony amplifier that had died a long time ago.

Headphone amplifier (again with NE5532A).

All components mounted in the case. The case was taken from an old and broken tape deck.

The finished amplifier on top of a CD/MiniDisc player (remember those? ;).