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Class D Switching Power Amplifiers and Power D/A conversion

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Old 17th September 2010, 04:42 PM   #761
ptiJean is offline ptiJean  France
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All relays clac at the same time (music goes away completely and comes back completely with next clac).

Measuring voltage ? I can try, not sure I see where.

Regards,
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Old 17th September 2010, 04:52 PM   #762
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Quote:
Originally Posted by divxfr View Post
Hi,
what's your yamaha model's ? For the comparaison with my RX-V2700...
thanks
My Yamaha is RX-V659, a rather old box.
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Old 17th September 2010, 05:02 PM   #763
sendler is offline sendler  United States
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Location: ny
Default Relay supply

Quote:
Originally Posted by ptiJean View Post
Let's summary :

- v2 amp is in metal case
- output offset both pairs set to 1mV
- Music flies cool ... when music is here

The problem remains : the relays do "clac" sometimes, anytime ... sometimes 10 times in a minute, sometimes not for 5 minutes.

Do you have other ideas about the problem ?
Listening to music is a pleasure, with the fear of the "clac"

Thank you all,
Regards
You will have to monitor the voltage supply to the relay coil coming from the protection IC. I think there is a series resistor? that you could clip onto. Maybe the series resistor is a little too large leaving the coils on the edge of dissengagenment from being just under the required voltage. If the voltage drops away all together then maybe there is an issue with the IC.
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Scott
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Old 17th September 2010, 05:24 PM   #764
alkasar is offline alkasar  France
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sounds like the chip gets in fault for some reason, and the fault protection mecanism turns green led off and relay. It could be due to undervoltage, could also be a short somewhere.

Considering it was working ok outside of the box, any fugitive contact somewhere with the box ? try with some non conductive material between amp and box ?
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Old 17th September 2010, 05:34 PM   #765
ptiJean is offline ptiJean  France
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alkasar : it was not working outside of the box, unfortunately.
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Old 17th September 2010, 05:46 PM   #766
alkasar is offline alkasar  France
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i misunderstood first statement in post #749. Sorry.
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Old 17th September 2010, 08:00 PM   #767
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Hi all,

I just bought this DAC: 2010 version 24bit/192khz DAC with fully assembled kits 2010 version 24bit/192khz DAC with fully assembled kits [226] - US$70.00 : Hifi Diy--Amplifier,dac kits,hifi audio products and parts online shop, shipping to worldwide

The specs. say the following:
Analog output: RCA 2V rms. @75 ohms

Can this output feed the T3 board directly or do I need some modifications of some kind?
For now I'm feeding the T3 with analog fro my computer and it's noisy and not so very loud.
Other than that I'm very happy with the T3.
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Old 18th September 2010, 05:20 AM   #768
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Quote:
Originally Posted by ptiJean View Post
alkasar : it was not working outside of the box, unfortunately.
Hi, turning the volume down to minium, disconnect the speaker and then test again. If there is still same problem, something must be wrong on board.
btw: Could you pls post the photo again, I can't see it sorry~.
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Old 18th September 2010, 09:11 AM   #769
alkasar is offline alkasar  France
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Join Date: Jan 2009
Location: near Paris, France
Quote:
Originally Posted by terralune View Post
Hi all,

I just bought this DAC: 2010 version 24bit/192khz DAC with fully assembled kits 2010 version 24bit/192khz DAC with fully assembled kits [226] - US$70.00 : Hifi Diy--Amplifier,dac kits,hifi audio products and parts online shop, shipping to worldwide

The specs. say the following:
Analog output: RCA 2V rms. @75 ohms

Can this output feed the T3 board directly or do I need some modifications of some kind?
For now I'm feeding the T3 with analog fro my computer and it's noisy and not so very loud.
Other than that I'm very happy with the T3.
Yes sure it will work. I don't have this dac but know someone who owns it : excellent dac for the price.
PC analog output are usually you should hear significant improvement with the DAC.
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Old 19th September 2010, 02:12 AM   #770
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After reading some more in this thread I got rid of my noise problem
It was a good thing to buy 2 power supplies for my T3 boards.
2 400W SMPS feeding the T3 boards directly and cable to the PSU board to use it's functions and the noise is all gone.
The T3's are working well.
Do any of you know of any chassis manufacturers? I really need to put this into a box, my better half is a little bit worried about all the loose cables
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