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Old 19th December 2012, 07:42 AM   #41
Philfr is offline Philfr  France
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Hi madtecchy,
You said : I use a bipole speaker system too
what is the design ?
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Old 19th December 2012, 10:08 AM   #42
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[QUOTE=Philfr;3290487.........
@ csom, nice project [/QUOTE]

Thank you Phil,

I just followed the super simple Pcb Layout from the datasheet as ,for me, it is more convenient and compact than a point to point build. I can easily experiment with /replace parts of the amp.

I wanted to use LM1875 but due to nonavailability, I used TDA2050s with dual supply and they are great sounding too.

The quick PCB-making process, etching, along with the soldering of the components took me approximately less than 6 hours for 4 amps due to the simplicity of the circuit.
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Last edited by csom; 19th December 2012 at 10:12 AM.
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Old 19th December 2012, 10:39 AM   #43
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Philfr View Post
Thank's Mooly, I note your comment..
So it looks good for the future
At this time I want shaw you a complete schematic of full system, to see if nothing was wrong about supply :
I've redrawn it for a single rail.

1. The batteries provide a 24 volt supply for the TDA's
2. The "lower" or righthand battery negative terminal is our zero point and is audio ground.
3. If the DAC etc need 12 volts then this must be fed from the lower battery. That provides a plus 12 volt rail above "ground"
4. A better ? approach might be to have a 12 volt regulator feeding the DAC. The supply for the 12 volt reg wouldbe from the plus 24 volt supply (the plus on the left hand battery). Doing that also "equalises" the load on the batteries so one doesn't discharge quicker than the other.
5. The signal must be AC coupled throughout. I've assumed the blue line is signal and the ground and so thats why I have showed the blue "ground" joined to the black negative battery terminal.
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Old 19th December 2012, 11:29 AM   #44
Philfr is offline Philfr  France
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Hi Mooly,
Sorry my drawn was not very clear..
Yes, blue line is signal (left and right channel).
pllxo (passive line level crossover) don't need supply.
TA2020 works only with 12 v dc
Thank's for coupled signal with ground, I forgot this.
"discharge quicker than the other", it's not a big problem, with one 18 amp gel battery I can use TA2020 and dac during about 30 hours, I hope 15 hours with tda's and two baterries..
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Old 19th December 2012, 03:40 PM   #45
johnr66 is offline johnr66  United States
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Here's my tiny single supply monoblock. I built it to work with a 30 volt power brick from an old HP inkjet printer. It makes 16 watts before clipping into 4 ohms. With a 38 volt supply, I get 27 clean watts, but I'd have to use a fan to cool the small heatsink, so I stay 30 volts or less. I can even run it at low power with a 9 volt battery pack.

Click the image to open in full size.

Here is my TDA2050 BTL amp. It makes 46 clean watts into 8 Ohms with my 38 volt supply. It is a split supply, but the amp could be made for single supply use easy enough. It is very small, but needs the large heatsink or a smaller one with fan.
Click the image to open in full size.
Click the image to open in full size.

On all my circuits, I use close to chip decoupling, star ground and RF filter on the input. They sound fantastic!
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Old 19th December 2012, 03:56 PM   #46
Philfr is offline Philfr  France
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Hi John,
Great job, it's works with only 9 volt
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Old 19th December 2012, 04:19 PM   #47
Philfr is offline Philfr  France
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I redraw schematic with version A and B, I'am not sure about signal ground

Click the image to open in full size.

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Old 19th December 2012, 04:19 PM   #48
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Great work John!! Well done!


Please forgive my ignorance but do I need to use a DAC even if I use the analog output of the PC with a dedicated high end sound card as a source?


Sorry to highjack the thread phil !
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Last edited by csom; 19th December 2012 at 04:43 PM.
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Old 19th December 2012, 04:30 PM   #49
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Philfr View Post
I redraw schematic with version A and B, I'am not sure about signal ground
Nope

You can't do it that way. Your drawings show one TDA running on 12 volts and the other on 24 volts. For single rail all the grounds must use the right battery negative terminal.

First question. Will the TDA 2050 be constructed to use a single 24 volt rail or a dual -/+12 volt rail Lets build it up from that.
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Old 19th December 2012, 07:31 PM   #50
Philfr is offline Philfr  France
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Thank's Mooly..
Yes, yes I see the problem
Solutions :
1 buy a new 12 volt battery just for TA2020 and dac
2 build another TDA2050 for drive FE126eN
This requires reflection !
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