A simple amplifier on the TDA2822

Hi friends. Today I will explain how to make a small power amplifier on a tda2822m chip. Here is the circuit I found in the datasheet of the chip. We will make a stereo amplifier, that is, there will be two speakers - right and left channels.

Amplifier circuit

Simple amplifier on TDA2822
We need:
  • Chip TDA2822m.
  • Resistor 4 , 7 Ohm (2 pieces).
  • Resistor 10 Kom (2 pcs.).
  • The condenser is 100 MkF (2 pieces).
  • Capacitor 10 microfarads.
  • Capacitor 1000 microfarads (2 pcs.).
  • Capacitor 0.1 microfarads (2 pcs.).
  • Speaker (about 4 ohms and 3 watts) (2 pcs.)

Assembling the amplifier

Collect circuit we will be on something average between the mounted installation and the PCB. The board section will serve as a board, we will fasten all the parts to it. For radio components, we make holes for the legs with a pin. In most cases, the legs will be in the role of tracks, which we will dissolve the whole scheme. The first thing we put in is the microcircuit itself, then we solder the plus leg of the 1000 μF capacitor to the very first leg.
Simple amplifier on TDA2822[center]A simple amplifier on TDA2822
Next, add a resistor of 4.7 ohms to the negative foot, and a 0.1 μF capacitor is attached to it (the capacitor is 104). We also solder the wire to the minus foot of the 1000 µF capacitor, one of the speakers will go to it.
Simple amp on TDA2822
Simple amplifier on TDA2822
We do the same thing with the third leg of the chip. Next, we solder to the second leg of the chip the plus leg of a 10 μF capacitor and a wire that will be a power supply.
The fifth and eighth legs of the chip are soldered to the plus feet of the capacitors at 100 uF.
A simple amplifier on the TDA2822
Solder two wires to the sixth and seventh legs of the chip - these are the right and left channels (the sixth is the right, the seventh is the left). Also solder two resistors on 10 com. Here I have a problem. Found only one resistor for 10 rooms. It’s unwise to go to the store for one resistor, so I had to remember a few lessons from physics. Namely, how to calculate the resistance when connecting two resistors in parallel.This is how the formula looks like:
Simple amplifier for TDA2822
But this formula only works with two resistors, if their formula does not fit more. I found resistors on 20 and 24, these are some old Soviet resistors.
A simple amplifier on the TDA2822
This is almost done. It remains to deal with the ground, it will be a minus power. All the remaining legs from the capacitors at 100; 10; 0.1 microfarads, as well as from resistors on 10 clods, need to be connected into one bundle. I connected all the earth on the leg of the capacitor to 100 microfarads, in some places I had to be connected with wires. Earth, also 4 feet of the chip.
A simple amplifier on the TDA2822
Also the ground will be the minuses of the speakers. Now we solder the jack to 3.5 mm. Copper wire is earth, red is the right channel is soldered to the sixth leg of the microcircuit (to the wire that was previously removed), blue is the left channel, soldered to the seventh foot.
Simple amplifier for TDA2822
Plus, each speaker is connected to the negative leg of the capacitors at 1000 μF. Speakers minuses solder to the common ground. The power supply plus is the wire from the second leg of the microcircuit, as I said earlier, the power supply minus is the ground.At this production circuit is over. We cut the cardboard, if the compactness of the scheme is important, then the cardboard should initially be taken smaller, since there are few elements on the scheme.


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