Super mega finalized awesome AUDIO AMP DIAGRAM!

bentomo · **Posted:** Wed Jun 29, 2011 4:18 am

Well emarassingly enough after some mistakes were caught and some degradation in quality over time I've decided to go back with the original components recommended by TI. I'm 99.9% sure that this diagram is error free and will give you the highest quality audio amp that this IC can deliver. Plus the option of a digital potentiometer for button pushing rather than using a massive chunky potentiometer to adjust the sound.

Capacitors are in micro farads. (µF)

SS used a 5 pin 10k pot from radioshack and it shorted out a gamecube momentarily, don't use those.

Try even a 15k pot if you want better volume control.

ShockSlayer · **Posted:** Wed Jun 29, 2011 6:09 am

Added to the sticky, looks awesome, thanks a ton!

I got mine in the mail today! <3

SS

brunoip · **Posted:** Wed Jun 29, 2011 7:55 am

bookmarked :rofl:

XCVG · **Posted:** Wed Jun 29, 2011 9:05 am

Missing the headphone circuitry. I am disappoint. For just speakers, though, thumbs up.

brunoip · **Posted:** Wed Jun 29, 2011 9:17 am

XCVG wrote:

Missing the headphone circuitry. I am disappoint. For just speakers, though, thumbs up.

Yes because the speakers in this circuit doesnt share a common ground like the ones in the headphones.
Thats why the IC have a pin for selecting between the speakers and the headphones, right?

ShockSlayer · **Posted:** Wed Jun 29, 2011 11:12 am

There is no such pin, at least I don't see one in the datasheet.

Although frankly it doesn't matter, because you can wire up a headphone jack to any audio amp, in this case use common ground for the headphones ground, and then just use the speaker's L and R positive lines to the respective headphone lines.

Might have put some resistors on the headphone jack though, most amps put out too much for headphones and the sound is loud. Be careful not to put them between the amp and the actual speakers though, you might get it too quiet!

After I build this amp I'll add in a headphone jack diagram, assuming I can find a headphone jack... >.>

SS

neverused · **Posted:** Wed Jun 29, 2011 1:17 pm

XCVG wrote:

Missing the headphone circuitry. I am disappoint. For just speakers, though, thumbs up.

XCVG · **Posted:** Wed Jun 29, 2011 2:47 pm

Actually, the TPA6021 can drive headphones in a different mode. The datasheet describes how to wire it to automatically switch. Alternatively, wire the headphone switches inline with the positive output to the speakers and ground out the sleeve. It can't be good for either the amp or the headphones, but it should work.

ShockSlayer · **Posted:** Wed Jun 29, 2011 3:00 pm

*checks*

That is awesome, it does. Weβeta should like, totally make a second diagram with that in it.

SS

bentomo · **Posted:** Wed Jun 29, 2011 8:14 pm

XCVG wrote:

Actually, the TPA6021 can drive headphones in a different mode. The datasheet describes how to wire it to automatically switch. Alternatively, wire the headphone switches inline with the positive output to the speakers and ground out the sleeve. It can't be good for either the amp or the headphones, but it should work.

I've wired it like this before, I used to use the standard diagram but skipping that part of the circuit completely saves a lot of space and possible errors in the headphone wiring. I've found it cheaper to just use a switchable jack. I can't find a reason not to just use a switchable jack instead of using the auto switch built into the 6021. I don't recommend using the auto switch as far as I can tell.

If anyone has a reason for using it let me know please.

Super mega finalized awesome AUDIO AMP DIAGRAM!

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