Simulating Reactive Loads

Melon Head · 16th September 2010, 09:32 PM

I am having trouble reproducing the same results of impedance and phase vs frequency that stereophile have published for the dummy speaker load.
Here is the link
Stereophile: Real-Life Measurements

See the attachments for my results

If anyone else is familiar with LTSPICE that can check this out to let me know if I or stereophile have made a mistake, I would be greatful.

Melon Head · 16th September 2010, 09:43 PM

Sorry everyone I found my stupid mistake

wahab · 16th September 2010, 10:19 PM

generator output impedance is about 0.006R for the phase
response being the one displayed at stereophile..
That makes an amp with more than 1000 damping factor
at 8R load....
Did they test some SET with such "speaker equivalent load" ?...
The result should be intringuing...

ecir38 · 14th October 2010, 05:31 PM

thanh, did you ever build this?

I only seen one in the archieves by EUVL here
What do you use for a simple cheap load?

reference
Stereophile: Real-Life Measurements

Brad

Melon Head · 15th October 2010, 08:28 PM

I have not built it yet.
At the moment I use it for a few simulation tests.

ecir38 · 19th October 2010, 08:11 PM

Hi thanks for the reply. Would you or EUVL care to comment on wattage of resistors or heat sink size?

R1 5 ohm
R2 4 ohm
R3 5.6 ohm
R4 0.7 ohm
R5 100 ohm
R6 39 ohm
R7 0.6 ohm
R8 0.9 ohm

From EUVL's pic it looks like 63v electrolyptics are fine.

C1 4.7 uF
C2 3.3 uF
C3 500 uF

Wouldn't think gauge or esr would matter on the inductors.

L1 0.3 mH
L2 0.5 mH
L3 10 mH
L4 1 mH

Regards,
Brad

Melon Head · 19th October 2010, 09:01 PM

How many volts are you intending to put through it?

ecir38 · 20th October 2010, 12:12 AM

New to solid state, would want something to handle any diy amp in the forums.

If am going to build it wouldn't you want it to handle most if not all amplifiers with no sweat.

ie. My Citation II would smoke a 25 watt resistor in less than a minute when checking ac balance for the driver pentodes with a 1K signal.

Brad

16th September 2010, 09:43 PM	#2
Melon Head Formerly Thanh1973 Join Date: Nov 2006	Sorry everyone I found my stupid mistake __________________ "No, this sucker's electrical, but I need a nuclear reaction to generate the 1.21 gigawatts of electricity I need."

15th October 2010, 08:28 PM	#5
Melon Head Formerly Thanh1973 Join Date: Nov 2006	I have not built it yet. At the moment I use it for a few simulation tests. __________________ "No, this sucker's electrical, but I need a nuclear reaction to generate the 1.21 gigawatts of electricity I need."

19th October 2010, 09:01 PM	#7
Melon Head Formerly Thanh1973 Join Date: Nov 2006	How many volts are you intending to put through it? __________________ "No, this sucker's electrical, but I need a nuclear reaction to generate the 1.21 gigawatts of electricity I need."

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16th September 2010, 10:19 PM	#3
wahab diyAudio Member Join Date: Nov 2009 Location: algeria/france	generator output impedance is about 0.006R for the phase response being the one displayed at stereophile.. That makes an amp with more than 1000 damping factor at 8R load.... Did they test some SET with such "speaker equivalent load" ?... The result should be intringuing...

14th October 2010, 05:31 PM	#4
ecir38 diyAudio Member Join Date: Jul 2007 Location: New Orleans	thanh, did you ever build this? I only seen one in the archieves by EUVL here What do you use for a simple cheap load? reference Stereophile: Real-Life Measurements Brad

19th October 2010, 08:11 PM	#6
ecir38 diyAudio Member Join Date: Jul 2007 Location: New Orleans	Hi thanks for the reply. Would you or EUVL care to comment on wattage of resistors or heat sink size? R1 5 ohm R2 4 ohm R3 5.6 ohm R4 0.7 ohm R5 100 ohm R6 39 ohm R7 0.6 ohm R8 0.9 ohm From EUVL's pic it looks like 63v electrolyptics are fine. C1 4.7 uF C2 3.3 uF C3 500 uF Wouldn't think gauge or esr would matter on the inductors. L1 0.3 mH L2 0.5 mH L3 10 mH L4 1 mH Regards, Brad

20th October 2010, 12:12 AM	#8
ecir38 diyAudio Member Join Date: Jul 2007 Location: New Orleans	New to solid state, would want something to handle any diy amp in the forums. If am going to build it wouldn't you want it to handle most if not all amplifiers with no sweat. ie. My Citation II would smoke a 25 watt resistor in less than a minute when checking ac balance for the driver pentodes with a 1K signal. Brad

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