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Old 16th March 2010, 06:17 PM   #1
Adumas is offline Adumas  United States
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Default tda8560 audio amp wiring problem

Hi.. I am having a problem hooking up a TDA8560 chip on a breadboard. I expect that I do not fully understand how to establish connections to the inverting and noninverting pins... I mocked up a crude pcb layout that illustrates the connections... Can someone help me with the wiring - indicate what I have do incorrectly? This is the datasheet: TDA8560Q Datasheet catalog

P.S. I searched previous entries on the tda8560 chip - but either the information was not available or it didn't help..

I really think the problem is trivial for some experts out there - please lend a hand if you can... My son and I would really appreciate it...
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Old 16th March 2010, 11:35 PM   #2
Artie is offline Artie  United States
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That chip doesn't have "inverting / non-inverting" inputs. It only has left / right inputs. Not sure what you're asking.

Edit: One thing I see: This chip uses a "bridged" output mode. You do not want to connect the speaker neg's to ground. They must float. (Note pin 6.) Also looks like you have pin 9 grounded. Thats the positive speaker output of the other channel.

Last edited by Artie; 16th March 2010 at 11:45 PM.
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Old 16th March 2010, 11:47 PM   #3
Artie is offline Artie  United States
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Sorry for all the "edits". When you flip back and forth from one diagram to the other, you miss stuff.

To summarize, it looks like pins 6 and 9 should not be grounded.
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Old 16th March 2010, 11:54 PM   #4
Adumas is offline Adumas  United States
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Thanks for answering...

well, I assumed that the triangle for pins 4, 6, 7, 9 where op amps...

I guess if 9 is wrong, then 6 is probably as well... I removed both and updated the jpg.

What has me puzzled in looking at the datasheet is how to connect the + - portions of each pin (4, 6, 7, 9)... I can understand things from the speaker point of view... I just don't understand how to connect the - portion of pin 4 with the positive of pin 6, 9 - with + pin 7... And then how they relate back to the 30k divider... Looking at how I configured the 30k portion, did I connect everything correctly? Am I missing connections?

Take for example on the datasheet, there is a line going from pin 1 to the negative side of pin 6... How do I make that connection?
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Old 16th March 2010, 11:56 PM   #5
Adumas is offline Adumas  United States
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Aw thanks... I'm just grateful someone is helping... My son is looking at me and asking why I can't figure it out... I'm not coming up with good explanations...
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Old 17th March 2010, 01:03 AM   #6
Artie is offline Artie  United States
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Quote:
Originally Posted by Adumas View Post
Take for example on the datasheet, there is a line going from pin 1 to the negative side of pin 6... How do I make that connection?
You don't. Thats a block diagram. Those connections are already made internally, inside the chip. You only connect the stuff thats "outside" of the box.

So, you only do this:

Click the image to open in full size.

Last edited by Artie; 17th March 2010 at 01:08 AM.
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Old 17th March 2010, 01:42 AM   #7
Adumas is offline Adumas  United States
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Hi Artie.... well, I certainly didn't now that (block/internal diagram). Other people keep telling me just look at the diagram.... Bummer...

Just a couple of more questions:
Does the mode switch have to be configured? - and pin 12? In my diagram I laid out I think the mode switch configuration - is that right?

I figured that I could emblish things once I got sound out of the chip.. Incidentally, you haven't worked with this specific chip, have you?
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Old 17th March 2010, 09:21 AM   #8
Artie is offline Artie  United States
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I don't think that pin 12 must be configured, but if it was me, I'd add the circuit that they show on page 11 of that data sheet. (Fig 7) That will help prevent turn-on pops.

I've never used that particular chip before, but I've repaired many a car stereo.

BTW, thats 40-watts in car-stereo speak, (at 10% THD). In reality, expect closer to 15 - 20.

Its not clear if pin 12 can float or not, but to be safe, I'd put a 10k - 20k resistor from pin 12 to +V. (Pin 3 or 10.)

Last edited by Artie; 17th March 2010 at 09:24 AM.
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