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Old 22nd November 2012, 12:44 PM   #41
J.Hoyer is offline J.Hoyer  Estonia
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Default TDA2050 single supply

Hello, first I want to say thanks to all diyaudio forum members. The place is incredible, mecca for audio enthusiasts all over the world.

Heres my question about TDA2050 gainclone. I have designed a circuit and now before I start constructing I ask you to check it for errors and weak points. It is basicly a single supply schematic from TDA2050 datasheet that I have modified according to Rod Elliott's Project 72 Single Chip 25W Amplifier (Project 72). I have added the RF filter in the input and modified the Zobel circuit values.

1) are my modifications OK?
2) is there any real benefit from having "low ESR" caps in this schematic?

Circuit: skeem.png
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Old 22nd November 2012, 01:26 PM   #42
AndrewT is offline AndrewT  Scotland
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The section title is "Chip Amps", not gainclones.

C3+C10 is too big in comparison to C5.
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Last edited by AndrewT; 22nd November 2012 at 01:29 PM.
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Old 22nd November 2012, 01:51 PM   #43
J.Hoyer is offline J.Hoyer  Estonia
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Quote:
Originally Posted by AndrewT View Post
C3+C10 is too big in comparison to C5.
So do I have to make input, feedback and output cutoff frequencies more equal?
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Old 22nd November 2012, 03:01 PM   #44
AndrewT is offline AndrewT  Scotland
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C5 must be selected such that virtually no DC voltage and no AC voltage appears across it irrespective of what frequency the operating amplifier is asked to process.
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Old 26th November 2012, 09:32 PM   #45
J.Hoyer is offline J.Hoyer  Estonia
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I modified the circuit:

input cutoff frequency (2uF 24k2): 3.29 Hz
feedback cutoff frequency (47uF 680R): 4.98 Hz
output cutoff frequency (6000uF 4R): 6.63 Hz

What do you think about charging output caps through headphone circuitry when turn on?

Do yuo see any weak points in the circuit?


PS! Single supply solution was selected this time because I had the transformer, I want to study the solution and see its performance. Speaker protection into the bargain.

Thanks!
Attached Images
File Type: png skeem.png (36.2 KB, 86 views)

Last edited by J.Hoyer; 26th November 2012 at 09:35 PM.
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Old 27th November 2012, 09:54 AM   #46
AndrewT is offline AndrewT  Scotland
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JH,
you have the frequency back to front.
The single pole passive input filter should determine the passband of the amplifier. That should also include the Rf filter as well as the DC blocker.
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Old 27th November 2012, 10:50 AM   #47
J.Hoyer is offline J.Hoyer  Estonia
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Quote:
Originally Posted by AndrewT View Post
JH,
you have the frequency back to front.
The single pole passive input filter should determine the passband of the amplifier. That should also include the Rf filter as well as the DC blocker.
So the input side filtering should be the bottleneck?
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Old 27th November 2012, 11:13 AM   #48
AndrewT is offline AndrewT  Scotland
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set the passband of the amplifier at the input, i.e. both low pass and high pass.
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Old 12th December 2012, 07:18 PM   #49
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Hi all
Is there any "burn-in" time for TDA2050 amp?
If yes what is the typical burn-in time of this IC ?

I am curious to know because I found the sound has got slightly better after some 24 hours of running time of new amp.

I might be wrong, I'm afraid. So I just want to confirm from other experienced members whether I am right or not.

Best regards,
Som.
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Old 12th December 2012, 09:01 PM   #50
AndrewT is offline AndrewT  Scotland
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about the same time as it takes for the speaker delay circuit to connect the speaker.
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