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Class D Switching Power Amplifiers and Power D/A conversion

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Old 28th May 2012, 09:37 PM   #2831
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Quote:
Originally Posted by PressureFM View Post
Great, my Tripath TAA4100A chip in my AMP9 is faulty.

Anyone know where I can source a new one?
http://shop.41hz.com/shop/search.asp...y=name&sfield=
http://www.profusionplc.com/pro/gex/...artno=TAA4100A
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Old 29th May 2012, 12:59 PM   #2832
ALJ is offline ALJ
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Hey Saturnus

Did you ever get to test those 2.4GHz wireless audio modules we talked about with Coffin Camp last year in the Roskilde Festival forum? It seemed like such an awesome idea!

Otherwise I'm probably up for some testing for next year.
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Old 29th May 2012, 01:10 PM   #2833
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No. Instead I found this product which is a finished completed product that seems to offer everything wanted plus a little more, and being in a smart little package.

i2i Stream - Aerielle Technologies, Inc.
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Old 29th May 2012, 02:19 PM   #2834
ALJ is offline ALJ
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No. Instead I found this product which is a finished completed product that seems to offer everything wanted plus a little more, and being in a smart little package.

i2i Stream - Aerielle Technologies, Inc.
Ahh, looks cool. Have you tried them yet?

Another option could be in-ear monitoring systems. Transmitters usually run at about 300-400mA at 12V and receivers on 2xAA and should have a lot more range. But are also more expensive and a lot harder to use I guess.

Or the EMU Pipeline which seems to be a bit like those i2i units.
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Old 29th May 2012, 06:42 PM   #2835
gmarsh is offline gmarsh  Canada
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I just got in one of these things:

USB Bluetooth Wireless Stereo Audio Receiver for iPhone iPad Android Phone | eBay

I can play MP3 files on my cellphone and stream them to this gadget with bluetooth, which then outputs analog audio into my stereo. Works pretty well, sound quality seems pretty clean. I haven't measured how much current it draws yet, I'll do that sometime.

There's a little LED in this gadget that blinks when audio plays through it. If standby current is sufficiently low, and I use the blinkenled to turn on/off the audio amp, I could make a 100% sealed stereo if I wanted to - no external connectors/switches. Just solar panels and speakers on the outside.
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Old 29th May 2012, 07:18 PM   #2836
osny is offline osny  Sweden
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Piezo related.

I'm using QLM-1005. And have metal film resistor @ 113 ohm 5% 2W on each and one of them.

They still sound bad at volume 85%->100%.

I know they are crap, are there any substitutes for this? I could pay 15euro per tweeter, i just need it to sound good !
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Old 29th May 2012, 09:09 PM   #2837
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Originally Posted by osny View Post
Piezo related.

I'm using QLM-1005. And have metal film resistor @ 113 ohm 5% 2W on each and one of them.

They still sound bad at volume 85%->100%.

I know they are crap, are there any substitutes for this? I could pay 15euro per tweeter, i just need it to sound good !
The QLM-1005 is not one of my recommended replicas. I'm also sure the 113 ohm is too much for a motorola replica. 33 or 47 ohms would be recommended for that type of piezo.

Try that first. I won't help much though. Second is to mod the piezos with sealant as described earlier in this thread. And remember the part about taking them apart and glueing them back together.

That's about all you can do with a subpar replica. If you want a piezo to actually sound good, you have to buy original motorola/CTS KSN-1001A or KSN-1005A.
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Old 30th May 2012, 01:43 AM   #2838
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You can add a ti/metal tweeter with a very, very small value cap (in series), resulting in a super-tweeter. That will fill in for the high treble that the modern piezo doesn't do. It will assist the piezo.
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Old 30th May 2012, 12:29 PM   #2839
osny is offline osny  Sweden
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Originally Posted by danielwritesbac View Post
You can add a ti/metal tweeter with a very, very small value cap (in series), resulting in a super-tweeter. That will fill in for the high treble that the modern piezo doesn't do. It will assist the piezo.
How does this work? And can you recommend some?
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Old 30th May 2012, 02:14 PM   #2840
gmarsh is offline gmarsh  Canada
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Quote:
Originally Posted by osny View Post
Piezo related.

I'm using QLM-1005. And have metal film resistor @ 113 ohm 5% 2W on each and one of them.

They still sound bad at volume 85%->100%.

I know they are crap, are there any substitutes for this? I could pay 15euro per tweeter, i just need it to sound good !
Is it possible you're clipping your amp at volume levels >85%? Clipping creates pretty horrible sounding distortion, and a fair bit of that ends up coming out of the tweeters.

Fairly simple to find out if you're overexerting your tweeters or clipping your amp - increase the value of the series resistors a lot (up to 1K or something) which will attenuate the tweeter, put your ear by a tweeter and see if it still starts to break up at the same 85%+ volume level. If it still happens, you're clipping the amp.

Or if you can borrow an oscilloscope, just watch one of the amp output terminals - if the output bounces off ground or the +12V rail, it's your problem.
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