ZV4 Impedance to Power Supply - diyAudio
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Old 13th March 2003, 12:45 AM   #1
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Join Date: May 2001
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Default ZV4 Impedance to Power Supply

What is the Impedance (Or R at DC) of the ZV4 as seen from the power supply looking into the amp? How is this determined? - or measured?

I'm trying to calculate how much voltage will be lost by using an inductor in the PSU.

Thank you!


Is it the same as the load impedance?
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Old 13th March 2003, 10:47 AM   #2
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Join Date: Dec 2002
Location: Houston
Default Voltage drop across inductor

Because the circuit is Class A and has almost constant current draw the voltage drop across the choke is not determined by the input impedance of the V4 boards.
Take the current level (2.8 - 1.3 amps per channel) times the DCR of your chokes and this should give you the drop across the choke. For a good power supply choke this is very small.
I found some nonmagnetic 0.546 ohm, 1 %, 3 watt resistors to set the bias in my amp. This should give about 1.2 amps draw. My power transformer is 38 - 38 with one winding per channel. The choke stumbled on are 4 mH, 4 amp, 0.23 ohm DCR. I expect about 0.35 volt drop.
One area where the V4 might benefit is from upgrading the basic supply. But the capacitance multiplier will mask some of the power supply problems.

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