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Class D Switching Power Amplifiers and Power D/A conversion

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Old 17th June 2012, 12:35 PM   #2101
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I don't want more power. I don't want to bridge them. I want to parallel them.
I hope this makes senses.

If it can't be done an explanation would be nice. I had read somewhere someone was thinking of doing it on there 4x100 board. One person seemed to think it would be ok and explained how to do it, but I want to be sure, so if you can explain why it can't be done, that would be great.

Last edited by Melon Head; 17th June 2012 at 12:40 PM.
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Old 17th June 2012, 12:46 PM   #2102
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What do you mean by T3 or T4?
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Old 17th June 2012, 02:10 PM   #2103
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Quote:
Originally Posted by Melon Head View Post
I don't want more power. I don't want to bridge them. I want to parallel them.
I hope this makes senses.

If it can't be done an explanation would be nice. I had read somewhere someone was thinking of doing it on there 4x100 board. One person seemed to think it would be ok and explained how to do it, but I want to be sure, so if you can explain why it can't be done, that would be great.
Sorry, I can not give a better explanation that has already been posted earlier in this post:
New TK2050 board

This post is related to Hifimediy amps. Earlier ones are T1 and T2, later ones are T3 and T4
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Old 17th June 2012, 03:29 PM   #2104
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Never mind I just bought 2 x T2 SE amps, for a dual mono set up. I will just leave one channel unused on each amp
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Old 17th June 2012, 03:41 PM   #2105
alkasar is offline alkasar  France
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Quote:
Originally Posted by eladmi View Post
Hi there
I would like to use ane iPhone as audio source for the t2. As far as I know there will be a problem with the input sensitivity on the t2. Could anyone please advice me which resistors should be swapped? What would be the rating of the new resistors? Does anyone know the output sensiticvity of an iphone? Lots of qustions ;-)

Thanks in advance

Cheers
iPhone has about 1V output and T2 takes 1.6Vrms.
It will work with no issue. Just you won't get the full power from the amp.

If at full volume you don't have enough power, you can increase the T2 gain a little.
It's by default 15 V/V.
You could increase the gain to 20 by lowering R1, R4 from 20K to 15K.
see tk2050 datasheet for detailed explanation of Gain calculation. T2 input and feedback stage is according to datasheet.

Last edited by alkasar; 17th June 2012 at 03:44 PM.
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Old 17th June 2012, 03:49 PM   #2106
alkasar is offline alkasar  France
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Quote:
Originally Posted by Melon Head View Post
Never mind I just bought 2 x T2 SE amps, for a dual mono set up. I will just leave one channel unused on each amp
May I suggest that you try first a simple stereo implementation?
unless you want to build amplified speakers with physical separation of the amps, I expect very little benefit by going dual mono with these amps.
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Old 17th June 2012, 03:59 PM   #2107
alkasar is offline alkasar  France
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Quote:
Originally Posted by Electrix666 View Post
After some looking for a TK2050 amplifier I really don't know which one to buy.
Which amplifier and PSU is recommended for speakers with the following specs?

Element: 1" SuperAudio-treble, 2 x 3,5-" base
Impedance: 6 Ohm
Freq.range: 50-32000 Hz, 100-24000 Hz (+-6 dB), 150-22000 Hz (+-3 dB)
Delningsfrekvens: 4200 Hz
Sensitivity: 88 db (-+3 dB)
Max Power: 110 W
R.M.S. Power: 55 W

Thanks!
these are pretty common speaker specs. Most of the hifimediy amps will work well. It mostly depends on the power you want to get (how loud you want to play) and if you need or not onboard volume control.
A T2-510 with smps300R for example will be a good match. It you want to play very loud, T4 or T3S with SMPS500RS.
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Old 18th June 2012, 12:15 AM   #2108
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Quote:
Originally Posted by alkasar View Post
May I suggest that you try first a simple stereo implementation?
unless you want to build amplified speakers with physical separation of the amps, I expect very little benefit by going dual mono with these amps.
I have another idea. I think I will try a dual mono bi-amp setup, that way I can remove the resistive padding on the tweeter
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Old 19th June 2012, 05:29 PM   #2109
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Quote:
Originally Posted by hifimediy View Post
Hi, I think 220uF~680uF is ok here.

I also suggest using the sch bellow as we do on new T1.

R24 can be a 270~390ohm 1Watt resistor and C32 has range from 220~680uF, and no less than 35V. D2 is not installed.

What's thjis scheme for? I just installed an Nichicon gold of 220uf 50v in T2, and a 470uF 25V, some 100uF 50v for filtering the input also.

Haven't found an R24 in T2, do you think It should be fine like that:


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Click the image to open in full size.

Last edited by b4rr3l; 19th June 2012 at 05:45 PM.
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Old 22nd June 2012, 10:34 AM   #2110
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Got my T2 SE boards today.
I am going to test them out now.
Is there an owners/service manual for the boards?

Last edited by Melon Head; 22nd June 2012 at 10:43 AM.
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