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Class D Switching Power Amplifiers and Power D/A conversion

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Old 22nd October 2012, 09:25 PM   #2171
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Quote:
Originally Posted by alkasar View Post
don't think so. reference smps 0V to earth has a better chance to eliminate noise.

To recomend a power supply, need to know how you will use this amp.
why not try with the 500RS of your other T4 stereo amp ?
I will be using it as a 3 channel power amp to power LRC speakers. It will be feed source from my AV Receiver pre-amp outputs.
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Old 22nd October 2012, 09:58 PM   #2172
alkasar is offline alkasar  France
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Originally Posted by zanlation View Post
I will be using it as a 3 channel power amp to power LRC speakers. It will be feed source from my AV Receiver pre-amp outputs.
ok, so you need power on each channel.
For home theater, the center channel actually needs the most power. Maybe you coulld be happy with two SMPS300RS, one for L&R, one for the single C channel. With two separate smps, you would also eliminate the noise issue.
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Old 22nd October 2012, 10:06 PM   #2173
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Originally Posted by alkasar View Post
ok, so you need power on each channel.
For home theater, the center channel actually needs the most power. Maybe you coulld be happy with two SMPS300RS, one for L&R, one for the single C channel. With two separate smps, you would also eliminate the noise issue.
Thanks Alkasar. I will need to resolve my remote control switch issue again if I use two SMPSs (it took me a while to work out just one )
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Old 23rd October 2012, 09:38 PM   #2174
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maybe a bit offtopic but as here the RCA issue was discussed lastly I was wondering how channel separation works when R and L share same GND on for example T1 board . Isn't R and L channel connected/mixed together in this case ? I measured also a T2 board. Indeed R and L are connected together through the GND

Thanks in advance for a short answer (maybe from yubing itself) if possible
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Old 24th October 2012, 11:10 AM   #2175
alkasar is offline alkasar  France
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Originally Posted by TheDealer View Post
maybe a bit offtopic but as here the RCA issue was discussed lastly I was wondering how channel separation works when R and L share same GND on for example T1 board . Isn't R and L channel connected/mixed together in this case ? I measured also a T2 board. Indeed R and L are connected together through the GND

Thanks in advance for a short answer (maybe from yubing itself) if possible
Yubing can provide better answer. Note that this is not limited to tk2050. All amps not designed a dual mono (ie fully separate channels and power supply) have the issue.
It creates a little crosstalk, not annoying unless the source has high output impedance.
You can hear crosstalk for example in the left speaker if you unplug both the left input and the rigth speaker. It is usually quite low.
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Old 25th October 2012, 02:50 PM   #2176
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Originally Posted by alkasar View Post
Yubing can provide better answer.
My apologies folks !! It seems to be my month of defaults. I switched my multimeter to next wrong position. Instead to measure signal-pass I measured something else. Hope the pic shows the default position with the 2 triangles closed together. In this wrong position I measured signal-pass form GND to R/L and alltogether

Changed to right multimeter position there was no connection between the points

Bild0383.jpg
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Old 25th October 2012, 05:55 PM   #2177
Trebla is offline Trebla  United Kingdom
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Does anyone have a problem with the T1 making a whistling noise at full volume?

There is also some low level hum which disappears when the whistling starts.

It maybe due to the Kodak smps i'm temporarily using.

Otherwise it's a very good amplifier, in my opinion.
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Old 26th October 2012, 01:00 AM   #2178
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with battery supply the T1 is death silence. Use best and clean powersupply you can get.
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Old 26th October 2012, 11:48 AM   #2179
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Quote:
Originally Posted by Trebla View Post
Does anyone have a problem with the T1 making a whistling noise at full volume?

There is also some low level hum which disappears when the whistling starts.

It maybe due to the Kodak smps i'm temporarily using.

Otherwise it's a very good amplifier, in my opinion.
I bet the Kodak PS is the problem. I was using a HP smps and had the same issue. Ever since I switched to a ConnexElectronic smps It's been silent. A cheap Meanwell clone from EBay works well too if you don't mind the size
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Old 26th October 2012, 12:24 PM   #2180
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Quote:
Originally Posted by Trebla View Post
Does anyone have a problem with the T1 making a whistling noise at full volume?

There is also some low level hum which disappears when the whistling starts.

It maybe due to the Kodak smps i'm temporarily using.

Otherwise it's a very good amplifier, in my opinion.
I bet the Kodak PS is the problem. I was using a HP smps and had the same issue. Ever since I switched to a ConnexElectronic smps It's been silent. A cheap Meanwell clone from EBay works well too if you don't mind the size
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