Ed,
Both you and I have done this, a whole industry has done this. This is the premise of the function of a Wheatstone Bridge; common mode cancellation.
The topic we are discussing is the (nonlinear) frequency behavior of resistors. An ideal resistor is pure resistor and follows Ohm’s Law to the letter. A not so perfect straight wire has resistance. Wrap that wire around a Ticonderoga pencil it begins to have inductance through the cedar core and capacitance between the adjacent coils. Crank up the voltage and there is more heat. There are more than just a few possible variables to clutter things.
Back to the Wheatstone Bridge, the typical notation is R1 at the upper left, R2 at the upper right, R3 at the lower right and R4 at the lower left. Place the input + between R1 and R2. Place the input - between R3 and R4. Place the output + between R1 and R4. Place the output - between R2 and R3. For future reference this is the test setup.
DT
Ed,
Both you and I have done this, a whole industry has done this. This is the premise of the function of a Wheatstone Bridge; common mode cancellation.
The topic we are discussing is the (nonlinear) frequency behavior of resistors. An ideal resistor is pure resistor and follows Ohm’s Law to the letter. A not so perfect straight wire has resistance. Wrap that wire around a Ticonderoga pencil it begins to have inductance through the cedar core and capacitance between the adjacent coils. Crank up the voltage and there is more heat. There are more than just a few possible variables to clutter things.
Back to the Wheatstone Bridge, the typical notation is R1 at the upper left, R2 at the upper right, R3 at the lower right and R4 at the lower left. Place the input + between R1 and R2. Place the input - between R3 and R4. Place the output + between R1 and R4. Place the output - between R2 and R3. For future reference this is the test setup.
DT
The plots you showed of measuring each side of the bridge shows the same HF issues. However if you subtract them you do not. So why when you measure as a bridge do you get a different result?
Just ordered 2 x 220 ohm Audio Note tantalium resistors. Unmagnetic 2 w with silver endcaps and silver leadouts. Very exspensive 73 pund for 2. Looking forward to place them at the output of my dac.
Still a mystery!
Question?
Wish I had 4 6 ½ digit volt meters to connect all at the same time.
This just done.
100K HZ
Supply voltage: 3.09221 volts
Voltage across R3: 1.54508 volts
Voltage across R4: 1.54525 volts
Delta 0.00017
Volt meter delta 0.057902
The calculated delta between measured voltages R3 and R4 is ~ 58mv less than the measured, with the volt meter, delta.
Why?
Still a mystery.
DT
Question?
Wish I had 4 6 ½ digit volt meters to connect all at the same time.
This just done.
100K HZ
Supply voltage: 3.09221 volts
Voltage across R3: 1.54508 volts
Voltage across R4: 1.54525 volts
Delta 0.00017
Volt meter delta 0.057902
The calculated delta between measured voltages R3 and R4 is ~ 58mv less than the measured, with the volt meter, delta.
Why?
Still a mystery.
DT
For optimal sound, don't forget to bless them with Holy Water before installing.
Attachments
What are they supposed to do to Sound?
Do they actually need to be soldered to something or is it enough to place them within, say, 6 inches from the DAC?
Shouldn't you also need to replace the other, say, 2000 resistors involved in the audio path from microphone to speaker?
Or at least the , say, 50 or 100 regular resistors present inside the DAC?
I suspect if you move the meter farther away from the signal generator the readings in bridge mode will change.
There are those who would be happy spending that on a bottle of wine or even a single meal. I'll bet the resistors last longer.
So for those who don't see value in one thing should feel free to try something else without ridicule.
Scott,
They Wagyu hamburgers here are only $3 more, is it worth it?
Ed, I thought that I made a useful suggestion considering the manufacturers own admitted problem, as to sound really that issue has gotten just too boring.
I prefer 100% grass-fed beef lean, mean, and strong tasting. Beef for toothless billionaires has no interest to me.
while the Kobé stays a good one (they have beer-grass in Japan)... but are made now in factory and never see the sun anymore but for TV to show they are "massageg" with beers ! So résistors and beefs is defintly better in Japan should be a serious philosophic thought ! Like the Riken Saké, when gold in it : you also sing better !
My two yens !
My two yens !
I even surmise they don't use the latin letters in Japan 😀
Hey the four yens remind me a game on a chess set with grains of wheat, while it works with rice as well !
just my four yens !
Hey the four yens remind me a game on a chess set with grains of wheat, while it works with rice as well !
just my four yens !
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There is certainly no accent acute in resistors. 😀
Accent grave over the e Egbert Souse, W. C. Fields.
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damned the Riken-Shu for health sounds better than the Shuriken, at least more preservative ! While I can't understrand you need to drink the synthetic Sake in a présevatif to avoid Beri-Béri !
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