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Brad Albing
Brad Albing
6/24/2013 4:03:02 PM
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Blogger
Re: For different speaker loads
@amrutah - it would be appropriate for and work well with various speaker load impedances.

Note that for high impedance loads, you may not realize much overall power savings.

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Brad Albing
Brad Albing
6/24/2013 4:00:17 PM
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Blogger
Re: DC DC noise
@amrutah - no - the ramping of the supply voltage will not pass thru to the speaker - as long as it has a little bit of actual ramp time. Any good amplifier is designed to have pretty good power supply rejection ration (PSRR), so if the supply doesn't ramp too quickly, the dv/dt won't pass thru. Also, switching noise is sufficiently high so that it won't show up at the speaker.

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Brad Albing
Brad Albing
6/4/2013 2:22:49 PM
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Re: Solid state vs. tubes
@eafpres - looks like s/o made a few of those in the basement (or garage) - does not inspire confidence.

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eafpres1
eafpres1
6/4/2013 2:10:38 PM
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Blogger
Solid state vs. tubes
When you start talking audio, when you get to guitar amplifiers, you immediately get to the tube vs. SS questions.  There are still lots of Class A and AB guitar amps sold based on tubes in some sections, like the preamp.

A couple of years ago I started hearing there was a solid state device that had been engineered to match the characteristics of 12AX7 tubes.  I saw some articles saying a company tubemodules.com was producing limited quantities.  I even found a picture of one:

12AX7 solid state drop in replacement

Any comments on the ever-lasting tubes vs. SS in power amps like guitar amps?  Has anyone seen or used one of these alleged replacements?

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amrutah
amrutah
6/4/2013 12:09:25 AM
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Master
For different speaker loads
Does Class-G architecture hold good for different speaker loads?

Does having Class-G architecture good only for lower loads, since current is a function of voltage ratio (VBAT/VSUP)?

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amrutah
amrutah
6/4/2013 12:02:37 AM
User Rank
Master
DC DC noise
Thanks for sharing this Brad.

  The Class-G are surely helpful in reducing the power.  The programming of the supply power according to the audio peak is very helpful.

  As shown in Fig 2 above the supply is ramped up and down immediately, will it not introduce any click and pop noise?

  The DC-DC will be switching and switching at frequency higher, say 10 times the audio range. Does this noise get filtered out by the speaker inductances?

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Maciel
Maciel
5/31/2013 8:49:40 PM
User Rank
Newbie
Audio - Fight !#$@#@
Hi Brad,

In the past I used a class B amplifier, the TDA1518 Phlips, good cost is a good power output.

It was a simple, one amp audio for gaming equipment, in every way to achieve maximum power had a distortion signal too big, anyway, it was good but we needed to solve some small details HW, especially with the power power, which was to be linear with a loud noise.

Another point that was already waiting for something to arrive at the maximum the integrated heated too much, then a good aréa dissipation was created.

There was something with a content tencnológio very large, but in the end application had an excellent result, I must stress the small details given above.

Another very good experience now with energized circuit voltage lower typical 3v, this is the ISD4002 is a ci for recording audio, a few seconds, lol enough to let me say "bald" ... I had many problems with the filters and the loss of the messages that were in memory of the uC, anyway after a good fight could improve perfomace, the output signal was white, no noise, it worked well ...

Until .... the internal battery is discharged, as there was limited output signal so that the consumer was less ...

Finally after much beating unable to handle the situation detection system using a low battery power and limit the ISD ...

I learned a lot, but got ...

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