Huygens MCD 1202 - Class D amp finally arrived
This very gentle guy called Adam Comack from spain developed with his Partner Fumac (member here) a brand new design of Class D amp.
Called MHz Class D or MCD. Finally the amp arrived well to me.
Detailed review follows after warm up and long listening:
Hi Fumac, if you read this thread, please could you explain me the
technical datas for the MCD 1202 in your homepage eden-audio.com ?
I am little bit confused about this:
Type MCD-1002 MCD-1202 MCD-1802 Name 4 input integrated stereo class-D amplifier Voltage AC :115/230 V 50/60Hz Output 4ohm ,THD<0.5% 100Wx2 120Wx2 180Wx2 power 8ohm ,THD<0.5% 50Wx2 70Wx2 100wx2 THD @ 1k Typical @ 7k Typical @ 15k(50k bandwidth) @1W 0.005% 0.007% 0.008% @8W 0.008% 0.015% 0.02% @Half power 0.02% 0.04% 0.04% Frequency response 5Hz~30K +0/-0.05db 1Hz~80KHz +0/-3dB (All load all power).
Are these technical datas for three models ?
Thats beside my review which will follow soon.
this is the datasheet of MCD1x02 AMPs
this is the modules datasheet that inside the MCD1x02 AMPs
because my english is not so good,
so perhaps some mistakes ,
if something wrong please tell me
The residual amplitude tells me that you have fairly high attenuation in the output filter. This means that your filter resonance frequency is much lower than your switching frequency and that your small signal bandwidth is much greater than your large signal bandwidth. What happens when you apply a high amplitude 1kHz square wave and have inductive load or no load at all? Is it still stable?
nice to meet you
we have a filter for class-d at 150k+0/-3db, pwm is 1mhz, about 6 times
one other class-d amp is 50k +0/-3db, pwm is about 400k, 8 times
so , you can get , our filter is not "much lower than pwm signal" than the others :)
because our pwm frequency is much higher than audio . so we can get very low residual amplitude
here is a picture for know about it :
more information here:
you can get the 200hz ~20khz square wave 60v output (6ohm 150Wrms)
at next data sheet at page 7
mcd-255 data sheet
it is very good at running at high power output.
if you need , i will take pictures for new test at low power and high power frequency respond.
Thank you for your reply!
What does the square wave response look like without load?
Patrik, I know you know a lot about this so I'll ask a newbie question:
1 Is it important to have a good beahviour without a load?
2 Can you predict something when you see the low load behaviour?
show you a picture, that you can get the diffrent at with and without loading
if we dont connet load , the square wave will be ring.
this depend on the output filter. class-d will be ring without load.
you can see, from open load to 4ohm, the respond at 1k is no diffrent, and at the 20k, is +/-2db,
from top to button
unload, 8ohms, 4ohms
nice to see you again
perhpas we dont use an amp without load, but we can test it without load then we can get more infomation of the respond at diffrent load
testing is not just test the nomal Conditions, to test it at special Conditions, then to know more about it . will help us make it better.
Your datasheet states that the frequency response is +0dB/-3dB 1Hz to 100kHz all loads and all powers? The graph you just showed says different?
At the filter resonance frequency (40kHz or more) a 15 subwoofer will act as open load. If the amplifier goes into subharmonic oscillation and sets on fire when going into severe clipping it is not considered to be a robust design.
It is very difficult to do a class d design that is good at everything. I know this for a fact.
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