TPA3122d2 Amplifier Problem

galaxy786 · 1st June 2009, 07:17 AM

Dear Friends,

sivan_and · 1st June 2009, 03:44 PM

Class D on breadboard ?

sivan_and · 1st June 2009, 03:45 PM

Whatz the problem ? every thing is clear from the pic itself !!!

theAnonymous1 · 1st June 2009, 10:02 PM

My TPA3122D2N BTL proto

galaxy786 · 11th June 2009, 06:33 AM

Thank You for your response

I couldn't check the link again as I wasn't sure that it could be helpful. Immediately after submitting the message I wasn't able to edit the post for more details.

I made this amplifier from off the shelf parts. I didn't have inductors. I tried without them. Thought that the inductors are probably to filter out higher frequencies. However the amplifier did nothing except very periodic ticks and that too at very low volume. Changed the gain selection pins but had no effect.

Are the inductors necessary for the operation or these are just to improve the voice quality? How could I wound these inductors at home (22 and 33 mH)? I do have feright rods.

audiomodder · 24th June 2009, 10:50 PM

yes, unfortunately they are required. I tried to do without them myself but had the same problem.

galaxy786 · 25th June 2009, 10:53 AM

Thank you for your reply, audiomodder.

Still I have not figured out how to wind these inductors myself.

sivan_and · 25th June 2009, 02:16 PM

What kind of ferrite rods u have ? ...even a drum inductor will suffice..get urself an LCR meter or borrow one...wind few turns and measure...its easy since the inductance required is only 22 micro henry..and the values r not super critical...first decide the loud speaker impedance..and topology single or bridge

audiomodder · 25th June 2009, 07:35 PM

no problem

yeah, values are def not too critical...and i found if you get the wrong value by a large margin all you get is a lower output, but it will still function.

be careful to make sure the inductors can handle the output capacity too, im using something like 1A or 2A capacity and they get kinda warm when playing music.

galaxy786 · 4th July 2009, 08:23 AM

Thankyou Sivan and AM,

I baught 22uH inductors. These look just like resistors (Red Red Black strips). But I have not tested yet. Size is a little larger than quarter watt resistors. Hope to test the circuit today.

I don't have inductance meter. For ferrite rods I have old TV flyback transformer's core. Wouldn't it do?

1st June 2009, 07:17 AM	#1
galaxy786 diyAudio Member Join Date: Jun 2009	TPA3122d2 Amplifier Problem Dear Friends,

1st June 2009, 03:45 PM	#3
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	Whatz the problem ? every thing is clear from the pic itself !!! __________________ SivanandBalan

1st June 2009, 10:02 PM	#4
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	My TPA3122D2N BTL proto __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

25th June 2009, 02:16 PM	#8
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	What kind of ferrite rods u have ? ...even a drum inductor will suffice..get urself an LCR meter or borrow one...wind few turns and measure...its easy since the inductance required is only 22 micro henry..and the values r not super critical...first decide the loud speaker impedance..and topology single or bridge __________________ SivanandBalan

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11th June 2009, 06:33 AM	#5
galaxy786 diyAudio Member Join Date: Jun 2009	Thank You for your response I couldn't check the link again as I wasn't sure that it could be helpful. Immediately after submitting the message I wasn't able to edit the post for more details. I made this amplifier from off the shelf parts. I didn't have inductors. I tried without them. Thought that the inductors are probably to filter out higher frequencies. However the amplifier did nothing except very periodic ticks and that too at very low volume. Changed the gain selection pins but had no effect. Are the inductors necessary for the operation or these are just to improve the voice quality? How could I wound these inductors at home (22 and 33 mH)? I do have feright rods.

24th June 2009, 10:50 PM	#6
audiomodder diyAudio Member Join Date: Jun 2009	yes, unfortunately they are required. I tried to do without them myself but had the same problem.

25th June 2009, 10:53 AM	#7
galaxy786 diyAudio Member Join Date: Jun 2009	Thank you for your reply, audiomodder. Still I have not figured out how to wind these inductors myself.

25th June 2009, 07:35 PM	#9
audiomodder diyAudio Member Join Date: Jun 2009	no problem yeah, values are def not too critical...and i found if you get the wrong value by a large margin all you get is a lower output, but it will still function. be careful to make sure the inductors can handle the output capacity too, im using something like 1A or 2A capacity and they get kinda warm when playing music.

4th July 2009, 08:23 AM	#10
galaxy786 diyAudio Member Join Date: Jun 2009	Thankyou Sivan and AM, I baught 22uH inductors. These look just like resistors (Red Red Black strips). But I have not tested yet. Size is a little larger than quarter watt resistors. Hope to test the circuit today. I don't have inductance meter. For ferrite rods I have old TV flyback transformer's core. Wouldn't it do?

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