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Old 10th May 2013, 06:30 PM   #1
Benik3 is offline Benik3  Czech Republic
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Default Amplifier with TDA7560 + LM1036

Hi
I would like to build some simply, cheap but powerful amplifier (I know, it's hard to put these things together )
Because I want to supply it from 12V, some car amplifiers chips looks like good choice. I looked on TDA7560 which has 4x output, up to 23W/4ohm 1% THD (is it per channel?). Or do you know about some more powerful amp? (maybe use 2x stereo amp)

Also I would like to build some simple treble and bass correction. (Maybe one to front and one for rear). I saw that e.g. in Lepai amp they use somthing like this one DIY Audio Projects Forum • Simple Passive Tone-Control
Next volume control and balance F-R.
I want to use it from one stereo source.

Is also possible to put this amplifier into bridged mode? If I get it right, I would have to build phase inverter...

I will use it on some party, so the quality of sound isn't so important.

Can you help me with this? Thank you

Last edited by Benik3; 15th June 2013 at 06:34 PM.
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Old 10th May 2013, 09:46 PM   #2
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TDA7560 is already a bridge amp. Didn't you look at the block diagram?

How else do you think they get "23 watts/ channel" from 12 volts?
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Old 10th May 2013, 10:16 PM   #3
Benik3 is offline Benik3  Czech Republic
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I mean instead of 4x 23W make 2x46W...
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Old 10th May 2013, 11:19 PM   #4
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No, you cannot bridge connect amp channels that are already bridged themselves, it won't work.
The only thing you can do to get more power is either use lower impedance speakers to increase current draw, or use a switch-mode power supply to generate a higher drive voltage for the amps.
Also be aware that even if you somehow manage to double the power to the speakers, it will only give you about 3dB SPL increase. To double the appearent SPL you'll need about 10 times the power to the speakers.

Mike
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Old 11th May 2013, 05:15 AM   #5
Mihkus is offline Mihkus  Estonia
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For car use i would use Stepup board from ebay
I was "180W" and amplifier... LM3886 75 4780 TDA7293 4 5
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Old 11th May 2013, 10:31 AM   #6
Benik3 is offline Benik3  Czech Republic
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Michael: OK. Because when I tried to find something about it on google, I found that it's possible with phase inverter and connecting speaker to + F-R and + R-R...

Mihkus: But for that I should have very powerful step up converter.
If you calculate the power of TDA7560, you get up to about 200W of power, right?
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Old 11th May 2013, 04:06 PM   #7
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I'll say it agian - No, you cannot bridge connect amp channels that are already bridged themselves, it won't work.
Looking at the data sheet (here: http://www.st.com/web/en/resource/te...CD00001962.pdf), the four channels show singe-ended inputs and differential outputs (the "+" ouput and the "-" output are both active, no ground connection,) in other words the output of each channel are already basically bridged, and you cannot bridge connect already bridged outputs.
The only way to get more power output with an amp like this is to use low impedance loads, and looking at the data sheet, it's apparent the distortion goes up dramatically around 15 - 20 watts output. If you need more power than this chip can provide, I suggest you look at other alternatives.

Mike
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Old 11th May 2013, 05:14 PM   #8
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Quote:
Originally Posted by Michael Bean View Post
I'll say it agian - No, you cannot bridge connect amp channels that are already bridged themselves, it won't work.
The point is that these are already bridge amps. You can't bridge a bridge amp.

You can build two of them for 8 channels, and drive two pairs of biamped speakers, or dual woofer/dual tweeter biamped speakers.

Your best alternative is to use more efficient speakers. 3 dB more efficiency is equivalent to twice the power form the amplifier. This is by far your most practical alternative.

With the right speakers, "23 watts x 4" is a whole lot of power.

By the way, to get that "23 watts" will require employing 4 ohm speakers.
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Old 11th May 2013, 09:22 PM   #9
Benik3 is offline Benik3  Czech Republic
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OK, I got it
The 23W should be enough for me, I just wanted to know this...

Now about the tone corection. The one I posted looks, that it work OK, but it' only passive, so there is 20dB lost.
But I could solve this by adding pre-amplifier. Do you have any tested tone control with preamp? I looked e.g. on schematic of cheap chinese amp Lepai 2020+...
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Old 12th May 2013, 04:46 AM   #10
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Figure two is simple and straightforward.

ESP - Simple High Quality Hi-Fi Preamp

You'l need a spit supply, though. +/- 10 volts would work fine.
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