mhz class-d amp for hifi audio

[fumac]

General Description
MCD stands for "MHz Class-D", a new branch of Class-D amplifier technology created by John Fu (Fumac) and Zhaolian Fu. This Class D amplifier technology operates at a relatively higher sampling frequency between 700kHz and 2.6MHz(factory selected).
This technology allows one to design amplifiers with excellent specification:
- High output power (up to 800w or higher),
- Very Low THD at full audio frequency (<0.00x%)
- Bandwidth 0-150kHz
- Small phase-shift
- Producing a Class-A alike sound.
All of these features can be achieved in a compact, cool running and environmental friendly circuitry. The superior sound quality suitable for wide variety of demanding applications.
Applications include:
1. HiFi audio
2. Active speaker
3. Professional amplifier
4. AV system
5. Ultrasonic high power AMP
MCD amplifier features two feedback paths (Figure 1). One is to produce the high frequency oscillation. The other is for audio frequency (AF) error feedback. This AF feedback includes the output filter to ensure load independent performance. By combining these two loops, One can create a system with both exceptional audio performance and technical indicators.
AF Error Feedback , Low THD
MCD has an audio frequency error feedback directly from the speaker terminal. This feedback can compensate distortion generated by the filter, so MCD can obtain a very low THD together with a very high power output.
The Higher The Sampling frequency ,
The More Detail
Previously, Class D technology ran below 100kHz. It was not fast enough for full-range (10Hz~20KHz) audio performance and most likely it was suitable for subwoofer (10Hz to 250Hz) applications only.
More recently, some Class D designers were able to increase the switching frequency to 200kHz-250kHz. This type of Class D amplifiers can produce close to audio full range (about 10hz-18KHz). Typically, these designs have great bass but poor treble. This kind of amplifiers can be found in home AV systems, sub-woofers, and medium class audio applications.
Bringing us up to date, there are some very good designs running at frequency in range 350kHz - 450KHz. Those are the very first designs that can reproduce the acceptable "full bandwidth" (10Hz~22kHz) with finesse.However, the large phase shift between bass and treble was a disadvantage in reproducing cohesive sound.
MCD runs at frequency between 700KHz to 2.6MHz (up to 6 times faster than other current technologies). It extends the amplifier bandwidth from below 0Hz to beyond 100KHz with a simple filter (150kHz Low Pass Filter). The high switching frequency makes all this possible.
The MCD will generate lower EMI, has lesser phase shift and a wider bandwidth than other Class-D amplifiers.

this is the datasheet of mcd-255:
http://www.mhzclassd.com/MCD-255%20datasheet(test%20version%201.1).pdf
rg
fumac

[edgewound]

It extends the amplifier bandwidth from below 0Hz to beyond 100KHz with a simple filter (150kHz Low Pass Filter).

DC in an audio amp....Excellent!!

This will be a boon to the reconing business.

Every home should have one....

[timc]

Below 0 Hz.....thats gotta be a record.........

[KromeDome]

Just the other day I was wondering what Bob Carver was up to lately...

[fumac]

DC in an audio amp....Excellent!!

This will be a boon to the reconing business.

Every home should have one....

sorry
my english is not very well
is from 0 to 150k
you can take a look at the test pictures
thanks

fumac

[JBL 4645]

Welcome to JBL fumac and happy new year.

Bugger I only clicked on the pdf file link, I can’t view it!!! So how much does this amplifier sale for, please say affordable because I’m a poor person, any pictures of this amplifier?

Why my Alesis RA300 have a frequency response from 10Hz to 50Khz. Not sure about my Marantz 1050 and 1030 I guess there dinosaurs.

So by having greater frequency response makes it easier for the recorded medium, to be heard in clear way?

Thanks.

[fumac]

Welcome to JBL fumac and happy new year.

Bugger I only clicked on the pdf file link, I can’t view it!!! So how much does this amplifier sale for, please say affordable because I’m a poor person, any pictures of this amplifier?

Why my Alesis RA300 have a frequency response from 10Hz to 50Khz. Not sure about my Marantz 1050 and 1030 I guess there dinosaurs.

So by having greater frequency response makes it easier for the recorded medium, to be heard in clear way?

Thanks.

thank you JBL 4645
the pdf file can be downloaded
i have checked
if you need , mail me pls, and i will send the pdf to you

most of class-d amp have a poor frequency respond
and this will make the phase shift of treble ba large.
we also test it, the quite diffrent with 50k-3db and 150k-3db.

rg
fumac

[hjames]

You really need to fix your PDF reader ... This is the 3rd time you couldn't download a PDF that was a perfectly working file.

The Adobe Acrobat Reader for Windows is a free program, download it right from Adobe at - http://www.adobe.com/products/acrobat/readstep2.html

Now, to get back to the topic of this thread- it didn't sound like fumac has made the amp modules available in small quantities (1 or 2) for the DIY crowd. If he has, we'd all like to know where and for how much!

Welcome to JBL fumac and happy new year.

Bugger I only clicked on the pdf file link, I can’t view it!!! So how much does this amplifier sale for, please say affordable because I’m a poor person.
any pictures of this amplifier?



Thanks.

[fumac]

here is the detal of mcd-255

1. FEATURES
* High output power:
130W to 8ohm
250W to 4ohm
400W to 2ohm
* Super wide bandwidth: (All load, Power stage)
5Hz-50 kHz +0/-0.05dB
3Hz-100kHz +0/-1dB
2Hz-150kHz +0/-3dB
* Low distortion (20Hz-22kHz, 6 ohm, Power stage)
THD < 0.006% @ 100Hz, 1KHz, 7KHz, 1W
THD < 0.008% @ 100Hz, 1KHz, 7KHz, 10W
THD < 0.040% @ 100Hz, 1KHz, 7KHz, 130W
* Very low phase shift: <8 degree between 20Hz-22kHz
* Very low output noise: <18uV (20Hz-22kHz,AC power supply)
* Dynamic range: 123dB
* High sample rate: 1MHz (+/-60KHz)
* Very low switching residue at output: 0.08V@ 1MHz(typical)
* Very high output current: 26A peak
* Balanced or unbalanced input
* Input impedance:
Pre-amp: 15K ohm (unbalanced)30K ohm (balanced)
Buffer: 18K ohm
Power stage: 6K
* Gain: 30.5dB
Pre-amp stage: 6dB (before POT)
Buffer: 9.5dB (after POT)
Power stage: 15dB (class-d)
* Full protection:
Speaker protection
Over current protection: activated at 26A
Over voltage protection: activated at >+/-49VDC
* Soft-on/off function: No Pop noise
* Sleep function: Can be controlled by MCU
* Ripple rejection: 68dB
* High efficiency: 91% (at 250w rms)
* Very low idle power loss: 4W-6W
* Not need for external heat sink (if loading>4ohm and module has open air)
*Main Voltage:
DC: from +/-38V to +/-48V or alternatively,
or AC: 30v-0-30v
2. Applications
* HiFi audio
* Active speaker
* Professional amplifier
* AV system
* Ultrasonic high power amplifier
3.Other information
*Size:110mm x 100mm x 50mm
*Weight: 500g

[fumac]

You really need to fix your PDF reader ... This is the 3rd time you couldn't download a PDF that was a perfectly working file.

The Adobe Acrobat Reader for Windows is a free program, download it right from Adobe at - http://www.adobe.com/products/acrobat/readstep2.html

Now, to get back to the topic of this thread- it didn't sound like fumac has made the amp modules available in small quantities (1 or 2) for the DIY crowd. If he has, we'd all like to know where and for how much!

----------------
hi hjames
perhaps it's my http sever mistake , sorry for that
the mcd-255 is for diyers. yes , any body can try it
the price is 95eur/channel .(not including shipping cost )
if need , send me a mail pls
rg
fumac

[KromeDome]

Is this available to us as a module?
How much per unit?
Where do we buy it?
Do you have any samples available?

Thanks!

edit:internet collision

[fumac]

Is this available to us as a module?
How much per unit?
Where do we buy it?
Do you have any samples available?

Thanks!

edit:internet collision

hello KromeDome
yes this is a module for diyers.
mcd-255: 250w to 4ohm, 95eur per channel (not including shipping cost)
you can buy it from me (email: fumac1*gmail.com * is @)
and then i shipping to you through tnt or ups.
no free sample. sorry
and the agent of spain is here:
http://www.eden-audio.com/shop/

rg
fumac

[JBL 4645]

You really need to fix your PDF reader ... This is the 3rd time you couldn't download a PDF that was a perfectly working file.

The Adobe Acrobat Reader for Windows is a free program, download it right from Adobe at - http://www.adobe.com/products/acrobat/readstep2.html

Now, to get back to the topic of this thread- it didn't sound like fumac has made the amp modules available in small quantities (1 or 2) for the DIY crowd. If he has, we'd all like to know where and for how much!

Yeah I know, Heather, should I uninstall the present pdf file program and upload a new pdf file program, because I have a few pdf files saved on the pc that I call (home cinema technical files).

Thanks.

And thanks as well to you fumac that was comforting to know, how many amplifiers use higher speed rates that is to reproduce the recorded soundtrack, and just how many of them are affordable or how about budget models to prime expensive types?

Oh one more thing, anything on the (Damping Factor)?


Thanks.

[edgewound]

hello KromeDome
yes this is a module for diyers.
mcd-255: 250w to 4ohm, 95eur per channel (not including shipping cost)
you can buy it from me (email: fumac1*gmail.com * is @)
and then i shipping to you through tnt or ups.
no free sample. sorry
and the agent of spain is here:
http://www.eden-audio.com/shop/

rg
fumac

Will you be showing product at the CES show in Las Vegas Jan.7-10, 2008?

If so....where, please?

[JBL 4645]

Will you be showing product at the CES show in Las Vegas Jan.7-10, 2008?

If so....where, please?

Hmm…