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Old 8th July 2006, 01:26 PM   #1
ash_dac is offline ash_dac  United Kingdom
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Unhappy tda2007A internals ?

Hi,

I opened up my pc speakers and they contained a tda2007a chipamp.

The ST internal schematic is making my head hurt !

What type of input stage is on the tda2007a ?


http://www.ortodoxism.ro/datasheets/...onics/1454.pdf
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Old 8th July 2006, 06:14 PM   #2
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Explain what you are using as a schematic for the real amp. I might be able to tell you if you are going to need to fret the internals or not. Don't worry for now.

PS: I think I might build one of these
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Old 8th July 2006, 07:15 PM   #3
ash_dac is offline ash_dac  United Kingdom
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Quote:
Originally posted by DJ Exprice
Explain what you are using as a schematic for the real amp. I might be able to tell you if you are going to need to fret the internals or not. Don't worry for now.

PS: I think I might build one of these
Hi,

The chip was inside my active pc speakers powered by a 12V dc supply. Looked to me like a standard datasheet implementation. The potentiometer was failing after four years putting dc onto the left speaker (which is now failing) and throwing the balance way off.

After searching the forum I think the chip has a single common-emitter input stage.

Here are the speakers. Can't do that with a flatscreen! Click the image to open in full size.
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Old 9th July 2006, 07:02 AM   #4
ozonek is offline ozonek  China
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The input stage is a common emitter single transistor amplifier followed by a emitter follower. The equivalent internal circuit diagram seems to have broken the rule that input to output is usually drawn from the left to the right.
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