A simple amplifier based on TDA7294 with a power of 100 W
There are quite a few varieties of budget amplifiers and this is one of them. The circuit is very simple and contains only one microcircuit, several resistors and capacitors. The characteristics of the amplifier are quite serious, at such a low cost. The output power reaches 100W at maximum power. Absolutely pure output is 70 W.
More detailed characteristics of the amplifier on the TDA7294:
The TDA7294 chip is cheap and costs a penny, I bought it - HERE.
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.
Drawing of the arrangement of elements:
Download to the board in lay format:
When printing, set the scale to 70%.
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.
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!
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!
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