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Old 25th January 2010, 07:15 AM   #11
Cristi is offline Cristi  Europe
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the height difference of 0.2-0.3 mm between the IC and rectifier will be compensated by the insulation sheet which must be placed under the IC. be careful that the IC pad should not touch the GND and must be insulated.
 
Old 25th January 2010, 08:19 AM   #12
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Thanks again for a quick reply. In the manual it's also mentioned that you could use isolation on the rectifier bridge! Maybe it should be pointet out, that the hight difference should be eiminated with the isolation on chip only?

Sorry for all my questions, but it's not the first time i build class d, and I know they can be unstable if not handled correctly.

On additional question. Can I have the amp switched on, with out load on the speaker output. Many class d amplifier don't like to be switched on with out any load on the speaker output.
 
Old 26th January 2010, 11:19 AM   #13
Cristi is offline Cristi  Europe
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if you want to use the amplifier without load, it might need to increase the value of the capacitor from the zobel network up to the value of the LC filter capacitor.
 
Old 18th February 2010, 06:11 PM   #14
Yag0fr is offline Yag0fr  France
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Default Again the pin 3 ...

Quote:
Originally Posted by Cristi View Post
The board has a simple regulator with zenner diode which provide this voltage. by default, the amplifier is unmuted. when you connect the pin 3 to GND the amp will mute.
Hello,

I'm making a DIY amplifier with a TDA8920BTH and I'm not sure what to do with the pin 3

When I read the doc, I understand that I have to provide a 5v DC to make the amplifier operating but when I read your post ... I'm confused because you say the amplifier is unmuted by default.

I'm also using this pre-amplifier in the box : Préamplification - LITE MV04 - Contrôleur de Volume passif Motorisé 2 ou 4 canaux so I could use the 5v LED SOURCE to provide this signal...

Thx for your help.
 
Old 18th February 2010, 09:26 PM   #15
alkasar is offline alkasar  France
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Did I get it for the cabling in Stereo or Mono (BTL) ?

What about the third proposal : would this work with a stero source ?
Click the image to open in full size.
 
Old 19th February 2010, 01:24 AM   #16
Cristi is offline Cristi  Europe
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pin 3 is already biased at 5V from a simple regulator, so the amplifier is in "play" mode. you can measure the voltage on the pin 3 with a multimeter. i can't see the link which you post due to the internet filters, pls send me by mail relevant infos.
first two setups are fine, the last one is not. if you supply the amp with stereo signal and you pick-up the signal from the outputs, like in BTL mode you will get some low freq. which are in phase and mid-hi will be distorted or out-of-phase. in addition to this, is likely that the amplifier will run in overvoltage protection mode due to pumping wich can ocure with such setup. you should not use-it like this.
 
Old 19th February 2010, 11:21 AM   #17
alkasar is offline alkasar  France
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Quote:
Originally Posted by Cristi View Post
first two setups are fine, the last one is not. if you supply the amp with stereo signal and you pick-up the signal from the outputs, like in BTL mode you will get some low freq. which are in phase and mid-hi will be distorted or out-of-phase. in addition to this, is likely that the amplifier will run in overvoltage protection mode due to pumping wich can ocure with such setup. you should not use-it like this.
Thanks Cristi. I would like to build an amp that can be used either in stereo or in mono. I'll put a switch to toggle input betwen schema 1 and 2.
 
Old 24th February 2010, 09:50 PM   #18
glt is offline glt  United States
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Any single channel for +/- 60V + volt supply amp? To replace a dead amp in sub...
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Old 24th February 2010, 11:24 PM   #19
Cristi is offline Cristi  Europe
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Quote:
Originally Posted by glt View Post
Any single channel for +/- 60V + volt supply amp? To replace a dead amp in sub...
yes. i'm working at that now, coming at the beginning of the next month. IRS2092 based class D amp.
 
Old 27th February 2010, 04:52 AM   #20
glt is offline glt  United States
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Very nice. A simple active low pass crossover would be nice :-)
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