Point 2 Point (no PCB) for TDA7293, TDA7294, TDA7295, TDA7296. - Page 6 - diyAudio
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Old 7th February 2013, 01:39 AM   #51
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Power off thumps from the speakers?
Check the standby circuit.
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Old 7th February 2013, 12:03 PM   #52
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Well preamp gave me an impact,But It has suck some treble,,I think I need compensation cap in Ne5534.I kept it empty.
IM using Fb shunt R=1K, Feedback R=22K,Low gain for Tda7294.
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Old 7th February 2013, 12:38 PM   #53
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I tried 8pf in Comp. cap,,but I don't like the sound.Removed again.Treble is not strong enough.Something went wrong.
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Old 8th February 2013, 07:58 AM   #54
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You could try raising the gain of preamp and then adding a resistor for global negative feedback from the output of the power amp to the inverting input of the preamp. See also composite, nested designs. Check for DC offset before connecting speaker. A composite design with a Class A preamp will force the power amp to sound like Class A, in proportion to the added global negative feedback.
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Old 8th February 2013, 08:21 AM   #55
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Now I know the taste of music is a never ending adventure.
I have remove the classA bias,it's just the NE5534.Now I think Its a bit sweeter in treble.
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Old 8th February 2013, 04:42 PM   #56
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Question: Did you have the 4.7u output cap of the preamp in series with the 1u input cap of the TDA729X?
Question: Did you put a potentiometer or other disturbance between preamp and power amp?
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Old 9th February 2013, 12:43 AM   #57
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Quote:
Originally Posted by danielwritesbac View Post
Question: Did you have the 4.7u output cap of the preamp in series with the 1u input cap of the TDA729X?
Question: Did you put a potentiometer or other disturbance between preamp and power amp?
I have no 4.7uf after preamp.I have two 2.2+--+2.2 uf as input cap in TDA7294.I have 10K pot for Tda7294.
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Old 9th February 2013, 12:56 AM   #58
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Quote:
Originally Posted by danielwritesbac View Post
You could try raising the gain of preamp and then adding a resistor for global negative feedback from the output of the power amp to the inverting input of the preamp. See also composite, nested designs. Check for DC offset before connecting speaker. A composite design with a Class A preamp will force the power amp to sound like Class A, in proportion to the added global negative feedback.
Sorry that is way advanced from me.I can't understand it.
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Old 9th February 2013, 01:04 AM   #59
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Loss before cap can act like tone control.
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Old 11th February 2013, 02:24 AM   #60
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This is not from my preamp that made a muddy treble.I think this is the tda7294 itself.Becoz when i removed preamp ,,same sound.
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