testing of SPS80 SMPS - Page 3

ssanmor · 23rd October 2006, 06:41 AM

Thanks for the comments, Ackcheng, Gertjan, Eva.
The thing is that, although the supply is specified for 800W output, it has shown a much higher capability.
For example, we have been testing one of our SPS80HV special versions (+/-85V output) with two of our soon-to-come 750W modules, and it drove them quite well, with not too large voltage drop even with hard bass notes. When playing music we measured clipping at around +/-75V with 3.6 ohm speakers, that means around 1.5KW+ peak power consumption. The supply didn't complain at all and remained cool ;-)

KeithC · 23rd October 2006, 10:24 PM

Quote:

Originally posted by ssanmor
our soon-to-come 750W modules;-)

Wonderful. just what the world needs, another amplifier on steroids.

ackcheng · 24th October 2006, 01:12 PM

OK. Now I have finally hook it up to my UCD

First I tested the linear power supply LPS with 400W transformer and the filter unit ordered from hypex

This pic shows the output waveform of the linear power supply with UCD at no output , amplitude is 75mV

ackcheng · 24th October 2006, 01:14 PM

Now, with linear power supply, UCD out put at 30W, amplitude of the pulse 100 - 200mV

ackcheng · 24th October 2006, 01:17 PM

UCD + SPS80 no out put, Pulse amplitude 175mV (without choke), the frequency of the pattern is 170khz

ackcheng · 24th October 2006, 01:22 PM

UCD + SPS80 30W out put ,Pulse 200mV(without choke) the frequency is 170khz

ackcheng · 24th October 2006, 01:30 PM

OK. How does it sound. Mine you that this is compared to the 400W transformer and only one UCD400AD is connected in both cases.

With SPS80, there is not much difference between the high and mid. but the lower end is alot tighter, more punchy and more dynamic.

There is no graininess or harshness. Even though there are some pulses at 170KHz on the oscilloscope, that is way outside the audible frequency and certainly have no ill effect on the sound.

Actually, I have tested UCD output before and I can also see these carrier frequency on the wavefrom. Certainly, most member on this forum can testify that UCD sound very good.

jackinnj · 14th November 2006, 12:52 PM

Question -- have these power supply modules been sent out to a lab for EMI and RFI testing -- ???

ackcheng · 14th November 2006, 01:25 PM

No idea! I will leave this question to Sergio to answer!

ssanmor · 14th November 2006, 01:31 PM

Tests for certification are in progress, for the customers that need them, but as you know these are quite long and expensive.

Basing on our experience, they shouldn't have any problem to pass the certifications as we have tested them near receivers and other sensitive electronic equipment, etc, and even when delivering full power no disturbance was observed, so emissions are very low.

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23rd October 2006, 06:41 AM	#21
ssanmor diyAudio Member Join Date: Jan 2002 Location: Madrid	Thanks for the comments, Ackcheng, Gertjan, Eva. The thing is that, although the supply is specified for 800W output, it has shown a much higher capability. For example, we have been testing one of our SPS80HV special versions (+/-85V output) with two of our soon-to-come 750W modules, and it drove them quite well, with not too large voltage drop even with hard bass notes. When playing music we measured clipping at around +/-75V with 3.6 ohm speakers, that means around 1.5KW+ peak power consumption. The supply didn't complain at all and remained cool ;-)

24th October 2006, 01:30 PM	#27
ackcheng diyAudio Member Join Date: Dec 2003 Location: hong Kong	OK. How does it sound. Mine you that this is compared to the 400W transformer and only one UCD400AD is connected in both cases. With SPS80, there is not much difference between the high and mid. but the lower end is alot tighter, more punchy and more dynamic. There is no graininess or harshness. Even though there are some pulses at 170KHz on the oscilloscope, that is way outside the audible frequency and certainly have no ill effect on the sound. Actually, I have tested UCD output before and I can also see these carrier frequency on the wavefrom. Certainly, most member on this forum can testify that UCD sound very good.

14th November 2006, 12:52 PM	#28
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Question -- have these power supply modules been sent out to a lab for EMI and RFI testing -- ???

14th November 2006, 01:25 PM	#29
ackcheng diyAudio Member Join Date: Dec 2003 Location: hong Kong	No idea! I will leave this question to Sergio to answer!

14th November 2006, 01:31 PM	#30
ssanmor diyAudio Member Join Date: Jan 2002 Location: Madrid	Tests for certification are in progress, for the customers that need them, but as you know these are quite long and expensive. Basing on our experience, they shouldn't have any problem to pass the certifications as we have tested them near receivers and other sensitive electronic equipment, etc, and even when delivering full power no disturbance was observed, so emissions are very low.