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enotik500
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09.04.10, 21:19
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Amplifier design FAQ
Amplifier design FAQ | Homemade speakers and sound amplifiers

Note: a sample instruction for assembling an amplifier on Burr-Brown OPA microcircuits ishere.
The fundamental difference between the chips in this FAQ:
TDA2822m - for speakers;
TDA7050 - headphone.

TDA2822m based amplifier
general form
Attached Image
pin layout (chip marking up)
Attached Image
chip parameters
stereo power on
Attached Image
bridge start
When the bridge is switched on, only the output power changes:
Attached Image

typical switching circuit
stereo
Attached Image
pavement
Attached Image

visual scheme
Attached Image
Yellow circles with a black symbol - the place to connect the speakers
Gray circles with a yellow symbol - signal input
Pink circles - the place where the wires are connected (wire crosses without a pink circle - this is a wire cross: there is no need to connect them!)
This scheme can be assembled as a mounted installation, and on the board. For this we need the following details:
ChipTDA2822m- 1 PC.
Resistor10 kΩ- 2 pcs.
Resistor4.7 ohms- 2 pcs.
Electrolytic capacitor100 uF 16 V- 2 pcs.
Electrolytic capacitor470 uF 16 V- 2 pcs.
Electrolytic capacitor10 uF 16 V- 1 PC.
Ceramic non-polar capacitor0.1 μF- 2 pcs.

However, the scheme can work with a minimum set of radio components:
Electrolytic capacitor100 uF 16 V- 2 pcs.
Electrolytic capacitor470 uF 16 V- 2 pcs.

When assembling, let's say a small deviation from the tabular values ​​of parts according to the rule “more is better” (say, instead of a capacitor of 470 microfarads, put 1000 microfarads).
If after assembly the amplifier wheezes - check the correctness of soldering, supply voltage, input power (is the input volume too loud?)
With proper assembly and serviceable radio components, the amplifier can not work. Capacitors have polarity, pay attention to how they are soldered!
TDA7050 based amplifier
general form
Attached Image
pin layout (chip marking up)
Attached Image
chip parameters
Attached Image
typical switching circuit
stereo
Attached Image
pavement
Attached Image

visual scheme
stereo
Attached Image
pavement
Attached Image

Yellow circles with a black symbol - the place to connect the speakers
Gray circles with a yellow symbol - signal input
Pink circles - the place where the wires are connected (wire crosses without a pink circle - this is a wire cross: there is no need to connect them!)
This scheme can be assembled as a mounted installation, and on the board. For this we need the following details:
ChipTDA7050- 1 PC.
Electrolytic capacitor100 uF 16V- 2 pcs.

When assembling, let's say a small deviation from the tabular values ​​of parts according to the rule “more is better” (say, instead of a capacitor of 470 microfarads, put 1000 microfarads).
If after assembly the amplifier wheezes - check the correctness of soldering, supply voltage, input power (is the input volume too loud?)
With proper assembly and serviceable radio components, the amplifier can not work. Capacitors have polarity, pay attention to how they are soldered!


Post has been editedBlack fish - 21.01.16, 18:00
Reason for editing: Added link to BB
ghostlight
Message#82
22.05.10, 23:58
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What kind of amplifier on a TDA2822m microcircuit is better to assemble, according to a typical scheme or on 4 capacitors, and what is the difference? And then the desire to collect appeared, but knowledge is not enough))
enotik500
Message#83
23.05.10, 09:33
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ghostlight,
the difference in the number of parts that it needs to work, but the 4-konder circuit does not work with all 2822 microcircuits! Need to try.


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[Yuzerok]
Message#84
23.05.10, 12:35
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I advise you to solder on the datasheet will work for sure!
ghostlight
Message#85
23.05.10, 18:14
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The circuit for 4 Conder does not work with all the 2822 chips! Need to try.

This is an interesting info, the number of parts does not matter to me, the main thing is that it works.

[Yuzerok]follow your advice
[Yuzerok]
Message#86
08.06.10, 13:22
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Tell me which speakers are better to buy so that they have a better sound quality (if you can link to a magician). First of all, thank you!
Semyon
Message#87
08.06.10, 16:57
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Theme class like i used tosavagemessiahzine.comI did not find this one. That's just such a question, in my hd2 I just do not like either the sound quality or its volume. With the purchase and assembly of elements, I think there should be no problems. But the trouble is, in such a top communicator, all the details are very tightly packed, and the speaker is not the biggest there. Are there any other options besides external ones?


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enotik500
Message#88
08.06.10, 17:57
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looking for what you need .. I would have done an external one, if I were to spoil such a machine by embedding something inside ....


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Semyon
Message#89
08.06.10, 18:31
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enotik500 @ 8.6.10, 18:57*
to spoil such a machine by embedding something inside ....

I also thought about it. But I want to add something. Are there any options for audio output (3.5mm mini-jack)?


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enotik500
Message#90
08.06.10, 18:52
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Semyon,
read facts, everything is chewed: thank_you:


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Trice
Message#91
08.06.10, 19:26
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Here I assembled a circuit for 4 capacitors
Attached Image
but there is a problem .... firstly, the second speaker does not work and there is a loud noise that interrupts the music. I reviewed the correctness of the soldering many times - everything is correct. Photos can not post (((
Tell me please how to remove the noise? powered by 3 1.2 volt batteries ...: unsure:: unsure:: unsure:
jaruto
Message#92
08.06.10, 20:39
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Trice, already said that this scheme is not suitable for all mikruham 2822! better to do on datasheet! ;)

Post has been editedjaruto - 08.06.10, 22:33
Trice
Message#93
08.06.10, 22:17
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then if one speaker, then this is betterAttached Image?
Sanis
Message#94
09.06.10, 09:05
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Hello
Amplifier call speaker died on asus p525.
Found tda7050 in the case of SO8 - baby.
I collected a bridge circuit from a datasheet - apparently very dependent on voltage. I connected the phone battery (3.7V at the time) - wheezing. What is strange - on datasheet can be up to 1.6V. I connected 5V usb - it seems normal.
I want to power the animal from the battery.
Will she go? If not, which one to choose with a minimum body kit and preferably in SO8?

Attached images
Attached Image


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My other car is Tarkus ..
Trice
Message#95
09.06.10, 10:48
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Sketch pliz a mono mode for tda2822 for the most))): blush: .... I hope there will be a 2.5 w 8 Om norm?

Post has been editedTrice - 09.06.10, 11:29
tranceman111
Message#96
09.06.10, 15:21
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Guys have a question for you) See, let's say at the PDA, the interpenetration of the channels with the evaluation is bad! But the amplifier has all the norms with this ... according to the characteristics .. Tell me ... If the amplifier (for Headphones) is truncated to the PDA .. it will improve the interpenetration of channels ??? Or does he stupidly strengthen the weak signal of the PDA ???


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enotik500
Message#97
09.06.10, 15:37
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tranceman111,
That with the PDA, get it!


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Trice
Message#98
09.06.10, 16:14
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Is it possible to bridge the tda2822 scheme for the most?))): blush:
jaruto
Message#99
09.06.10, 18:53
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Trice,
read the topic! already had a scheme

Posted 09/06/2010 6:53 PM:

Maverick1968 @ 25.4.10, 15:19*
tu fafiga
somewhere like this:
Reduced by 59%
Attached Image
774 x 780 (105.26 kilobytes)


here it is): happy:
[Yuzerok]
Message#100
10.06.10, 13:13
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I didn’t work very well according to that scheme, as the constant rattling and loudness is lower than the datashit bridge! Trice I’ve 4 pages spread out the pattern I’ve drawn up for the most soldering on it.
worm5320
Message#101
10.06.10, 16:07
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Is it possible to make a small amplifier that would fit into the body of the smartphone?
and I still can’t understand whether it is possible to make a stereo amplifier sound if initially only a mono is in a smartphone?
I'm in this all full noob (((

Post has been editedworm5320 - 10.06.10, 16:07

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