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Class D Switching Power Amplifiers and Power D/A conversion

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Old 25th March 2011, 01:21 AM   #1451
cOz is offline cOz  United States
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Anyone listen to T4 yet. Any news on that motorized volume pot?
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Old 25th March 2011, 02:02 PM   #1452
johnYks is offline johnYks  Australia
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Quote:
Originally Posted by v-bro View Post
This voltage applies to the rail voltage for the amplifier, surely this chip drives external mosfets (and it can handle quite a few, it's a monster in terms of gate charge/drive capability!), but this chip can make that possible!

The RA modules also have all parts open on a tiny PCB, and at 41hz you can order even a more upgraded specimen of that semi-discrete Tripath chip.

It uses TC2002 and this is the latest of this chip family. That means it's got all the latest of protection and sensing circuitry.

You don't have to use such a monstrous rail voltage, at lower voltages it does mean an extremely stable amp, which can drive extreme loads (under 1 ohms for instance) And it will stay entirely cold then....

Speaking of state of the art Tripath, this is one that makes my heart beat a few PBM faster!


Hello V-Bro
Could you please provide a link for the RA modules at 41 Hz

'The RA modules also have all parts open on a tiny PCB, and at 41hz you can order even a more upgraded specimen of that semi-discrete Tripath chip.

It uses TC2002 and this is the latest of this chip family. That means it's got all the latest of protection and sensing circuitry'.

Yours Sincerely
John
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Old 27th March 2011, 07:09 PM   #1453
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I'm about to order some MiniDSPs for our active crossovers. They will feed our power amps and they only output a max of .9 V RMS. I will be buying some of the HiFiMeDIY amps, but not sure yet which versions.

From the HiFiMeDIY amps specs it appears they require 1.5 V (RMS?). I read in a post last September that the amps then available could have a couple of resistors changed to allow full output from a lower voltage.

My questions are:

1. Can the T1, T2, T3 & T4 amps all be modified to deliver full output with .4 V input?

2. Do the PC boards have plated through holes or are they surface mount?

3. Is the 1.5 V input spec RMS and not Peak to Peak?

Thanks very much. I'm looking forward to finally hearing these amps in our system.

Rod
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Old 27th March 2011, 08:05 PM   #1454
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Quote:
Originally Posted by nwboater View Post

My questions are:

1. Can the T1, T2, T3 & T4 amps all be modified to deliver full output with .4 V input?

2. Do the PC boards have plated through holes or are they surface mount?

3. Is the 1.5 V input spec RMS and not Peak to Peak?

Thanks very much. I'm looking forward to finally hearing these amps in our system.

Rod
I don't see a way to edit my post. My question 1 should have said Full output with .9 volt input.

Rod
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Old 29th March 2011, 06:53 AM   #1455
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Which of the amps would be ideal for a ~6ohm load? I'm getting ready to start on a pair of Pencil 7's (Mark Audio Alpair 7) and have been looking to pick up one of hifimediy's amps as well. Thanks!
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Old 29th March 2011, 05:54 PM   #1456
gethin is offline gethin  Canada
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I just ordered a T1 ALPS with USB DAC and 36V PSU ! Can't wait to start assembly!

Gethin.
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Old 30th March 2011, 09:07 PM   #1457
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Quote:
Originally Posted by EvilYoda View Post
Which of the amps would be ideal for a ~6ohm load? I'm getting ready to start on a pair of Pencil 7's (Mark Audio Alpair 7) and have been looking to pick up one of hifimediy's amps as well. Thanks!
IMHO you could be happy with T1 sta510-ALPS pot, but T4 will be better (only because of more undistorted power available), if you can afford it. [I ordered a T4...It will arrive in the middle of april; if you want to know about...contact me ;-)
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Old 4th April 2011, 04:10 PM   #1458
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Hi there, I just bought a T1 CTR 80x2 @ 8ohm amp and I want to increase the gain so that it works well from mp3 players etc rather than mixers/laptops.

I've read a lot of this thread and discovered I can double the gain by switching a resistor.

Quote:
Originally Posted by hifimediy View Post
hi, please try R3=R5=40k for twice gain as before. I'm not sure what you prefer, so keep changing when get what you need.
But I still suggest adding a pre-amp for better behave.
You're going to have to forgive my newbish nature, but I don't even know where the resistors I need to change are on the board. Are there any tips/guides on doing this?

Anyone?

eta: I've seen the post about putting 20k resistors in parallel with r1 and r4. Is that the easiest approach? What type of resistor?

(yeah, I'm new to this )

Quote:
Originally Posted by alkasar View Post
for information

Highest Voltage Output (source : http://beavishifi.com/articles/headphonejack/)

an Ipod output is 1Vrms where a typical consumer audio device is 2Vrms

The gain V/V of the amp is (for the right channel) :
R5/R4 * (R15 + R11) / R11

to increase gain, increase R5 or lower R4 ?
SURE seems to lower R4 on their board. They add 22K resistors (0,1,2 depending on switch) in parallel to the existing 22K input resistor on their board.

I would suggest you do the same : if you want to double gain V/V, solder a 20K resistor in parallel to existing R4. And to R1 for left channel.

Last edited by fraction; 4th April 2011 at 04:23 PM.
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Old 4th April 2011, 04:19 PM   #1459
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Quote:
Originally Posted by alkasar View Post
for information

Highest Voltage Output (source : Connect your Ipod to a Stereo)

an Ipod output is 1Vrms where a typical consumer audio device is 2Vrms

The gain V/V of the amp is (for the right channel) :
R5/R4 * (R15 + R11) / R11

to increase gain, increase R5 or lower R4 ?
SURE seems to lower R4 on their board. They add 22K resistors (0,1,2 depending on switch) in parallel to the existing 22K input resistor on their board.

I would suggest you do the same : if you want to double gain V/V, solder a 20K resistor in parallel to existing R4. And to R1 for left channel.
this sounds like the easiest way. I'm guessing it's the tiny things marked R1 and R4 on the board then

Any hints on resistor types? I don't want to get the wrong ones.

(yes, I'm new to this )
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Old 6th April 2011, 10:41 PM   #1460
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Hi guys, what is the best power supply to use with these amps? i want a DC power supply and it has to fit in a small box (half the size of a standard seperate, 21.5cm) so it has to be small, the meanwells are too big, any other ideas?

Many thanks,
Adam.
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