Amplifier Specifications
More detailed characteristics of the amplifier on the TDA7294:
- The power supply is bipolar with a midpoint of 12 to 40 V.
- F out - 20-20000 Hz
- R out. Max. (supply +-40V, Rn=8 Ohm) - 100 W.
- R out. Max. (supply +-35V, Rn=4 Ohm) - 100 W.
- To the harmonics (Pout = 0.7 R max.) - 0.1%.
- Uin - 700 mV.
The TDA7294 chip is cheap and costs a penny, I bought it - HERE.
Amplifier circuit on TDA7294
These amplifiers work great in pairs, so make two of these and you'll have a simple stereo amplifier. More detailed characteristics of the amplifier and connection circuits can be found in Datasheet for TDA7294 chip.
It is advisable to choose a power supply for the amplifier that is one and a half times more powerful, so keep this in mind.
Amplifier PCB
Drawing of the arrangement of elements:
Download to the board in lay format:
plata.zip
[16.13 Kb] (downloads: 3400)
When printing, set the scale to 70%.
Ready amplifier
The microcircuit must be installed on a radiator, preferably with a fan, since it will be smaller in size. Making a printed circuit board is not at all necessary. You can take a breadboard with a large number of holes and assemble the amplifier in 30 minutes.
I advise you to build such a simple amplifier that has proven itself very well.
power unit
The power supply is completed according to the classical scheme with a 150 W transformer. I recommend taking a transformer with a ring core, since it is more powerful, smaller and emits a minimum of network interference and electromagnetic background of alternating voltage. The filter capacitors of each arm are 10,000 µF.
Collect your amplifier and see you soon!
