Amplifier specifications
More detailed specifications of the amplifier on the TDA7294:
- Bipolar power supply with a midpoint from 12 to 40 V.
- F out. - 20-20000 Hz
- R o Max. (power + - 40V, Rn = 8 Ohms) - 100 watts.
- R o Max. (power + - 35V, Rn = 4 Ohms) - 100 watts.
- To the garm. (Exp. = 0.7 P max.) - 0.1%.
- Uin - 700 mV.
The TDA7294 chip is cheap and costs a penny, I bought it - .
Amplifier circuit on TDA7294
Such amplifiers work well in pairs, so make two of them and you get a simple stereo amplifier. More detailed characteristics of the amplifier and switching circuits can be found in .
It is advisable to choose a power supply for the amplifier one and a half times more powerful, so keep in mind.
Amplifier circuit board
Figure layout elements:
Download to the board in lay format:
[16.13 Kb] (downloads: 1200)
When printing, set the scale to 70%.
Ready amplifier
The chip must be installed on a radiator, preferably with a fan, since it will be smaller in size. Making a circuit board is not necessary. You can take a breadboard with a lot of holes and assemble the amplifier in about 30 minutes.
I advise you to assemble such a simple amplifier that has proven itself perfectly.
Power Supply
The power supply is full according to the classical scheme with a transformer of 150 watts. I recommend taking a transformer with a ring core, as it is more powerful, smaller and emits a minimum of network noise and electromagnetic background of alternating voltage. The filter capacitors of each arm are 10,000 uF.
Build your amplifier and see you soon!
