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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

6 Channel volume control PT2325
6 Channel volume control PT2325
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Old 8th August 2019, 07:52 PM   #1
hansueli is offline hansueli  Switzerland
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Join Date: Oct 2017
Default 6 Channel volume control PT2325

hello guys

What do you think about PT2325 for volume control?


I plan to use PT2328 with WIMAs MKS2 1uF 63V 5% for IRS2092 amplifier.




Do I need to have two decoupling capacitors? 1uF at output of PT2325 like datasheet and 10uF of input for IRS2092? Or is it possible to have only the bigger one? Would 15uF be better for IRS2092?




On schematic one resistor and capacitor have no value.


Will 100R be good and 100nF ?


Thanks


I modded a Sony BDV-E2100 with 3 PCM5102A as DAC and its works great.

I have also the 6 channel IRS2092 amplifier.


Thanks
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Old 14th August 2019, 04:49 PM   #2
Mark Tillotson is offline Mark Tillotson
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Join Date: May 2018
Location: Cambridge UK
Use all the caps as shown in the datasheet, all the performance figures assume this. There are considerably more than 2 capacitors!


The datasheet text explains Cadj is 100pF for 1MHz operating freq - go with that. The R is
for filtering out noise on the digital rail - try 47 or 22 ohms, something like that.
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Old 14th August 2019, 06:57 PM   #3
russc is offline russc  England
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Join Date: Mar 2011
Location: W Yorkshire
I believe the op was asking if he needs both an output cap from the volume control chip feeding the input cap of his power amp board.
If so, then no, not when they are in the same enclosure and permanently connected.
Only one cap is needed.
Were the boards in separate enclosures then a cap on the output of one & input cap on the other would be usual as you may mix and match your equipment without danger.

I guess 'R' is to drop the voltage to 10V if say you had 15V rail.
Cadj the datasheet suggests 100pf for 1MHz osc freq.
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