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Old 1st June 2009, 07:17 AM   #1
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Default TPA3122d2 Amplifier Problem

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Old 1st June 2009, 03:44 PM   #2
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Class D on breadboard ?
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Old 1st June 2009, 03:45 PM   #3
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Whatz the problem ? every thing is clear from the pic itself !!!
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Old 1st June 2009, 10:02 PM   #4
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My TPA3122D2N BTL proto
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Old 11th June 2009, 06:33 AM   #5
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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.
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Old 24th June 2009, 10:50 PM   #6
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yes, unfortunately they are required. I tried to do without them myself but had the same problem.
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Old 25th June 2009, 10:53 AM   #7
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Thank you for your reply, audiomodder.

Still I have not figured out how to wind these inductors myself.
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Old 25th June 2009, 02:16 PM   #8
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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
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Old 25th June 2009, 07:35 PM   #9
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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.
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Old 4th July 2009, 08:23 AM   #10
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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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