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Resistor math
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Topic: Resistor math (Read 3526 times)
richidoo
Out Of My Speaker Cabinet
Posts: 11144
Resistor math
«
on:
March 24, 2012, 06:11:50 PM »
My speakers have a fixed LPad (R1 & R2) followed by an adjustable rheostat Lpad (R3 & R4) to attenuate the tweeter. I want to replace these two Lpads with a single pad with fixed resistors. I will measure the value of the adjustable Lpad to determine R3 and R4. How do I add the two pads together to determine the replacement resistor values? I'm looking for a single series and single shunt resistor values. Thank yoU!
Rich
«
Last Edit: March 24, 2012, 06:13:31 PM by richidoo
»
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richidoo
Out Of My Speaker Cabinet
Posts: 11144
Re: Resistor math
«
Reply #1 on:
March 24, 2012, 06:19:42 PM »
Is it as simple as adding up the series resistors
R1+R3
and adding up the parallel resistors
1/(1/R2 + 1/R4)
as normal?
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richidoo
Out Of My Speaker Cabinet
Posts: 11144
Re: Resistor math
«
Reply #2 on:
March 29, 2012, 01:13:17 PM »
bump
Can someone confirm if the above post is correct?
Thanks!!
Rich
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Barry (NJ)
Audio Neurotic
Posts: 1713
Re: Resistor math
«
Reply #3 on:
March 29, 2012, 01:49:38 PM »
Wish I could really help Rich. I saw this when you first posted it, and my gut is telling me you can't just do some math to replace these 4 with 1, because they are in different locations on the circuit, but I'm not really knowledgeable on this stuff, so I sat on my hands
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Happiness is when your system overcomes your nervosa
So much media, so little time...
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_Scotty_
Obsessively Audiophilic
Posts: 676
“Sic transit gloria mundi”
Re: Resistor math
«
Reply #4 on:
March 29, 2012, 02:53:34 PM »
Rich, being the lazy person that I am the first thing I would do is remove the first Lpad resistor network and then measure the resistance needed for the fixed Lpad network directly from the adjustable Lpad.
Scotty
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richidoo
Out Of My Speaker Cabinet
Posts: 11144
Re: Resistor math
«
Reply #5 on:
March 29, 2012, 03:00:17 PM »
That's OK Barry, thanks for replying!
Dang-NABBIT Scotty you are so clever! Who needs engineering when you have common sense? Thanks!
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Resistor math