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Old 21st September 2008, 01:11 PM   #11
maxpou is offline maxpou  Canada
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Hi guys!
thank you for fast reply!
I use 23V supply voltage look at: http://www.diyaudio.com/forums/showt...07#post1524207

I'm not sure if i need a voltage gain stage, i change the DAC in CD player and i think that i have 1,4Vp-p output.

thank you! Maxpou
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Old 21st September 2008, 04:47 PM   #12
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maxpou,
I`d go for a simple stage in keeping with this one.
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Old 19th November 2008, 11:33 PM   #13
maxpou is offline maxpou  Canada
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Hi guys,
i found this website for calculate the resistors for my shunt attenuator, but what's the best serie value and how many DB between each step because i have 24 step. Thank you! Maxpou

http://homepages.tcp.co.uk/~nroberts/shunt.html
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Old 20th November 2008, 08:32 AM   #14
AndrewT is offline AndrewT  Scotland
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Hi Max,
do you know what range of attenuation values you currently use?
Design each step to suit your needs.

It could be done with equal steps of 1dB giving a total attenuation -23dB.
or
steps of 1.5dB giving -34.5dB
or
steps of 2dB giving -46dB.
or
unequal steps.
Use big steps in the range you rarely or never use and small steps in the range you typically use. eg, 0, -6, -12, -18, -20, -22, -24, -26, -29, -30, -31, -32, -33, -34, -35, -36, -37, -40, -43, -46, -50,
-55, -60, -70.

You choose what best suits your use and your system.
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Old 20th November 2008, 08:46 AM   #15
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Quote:
Originally posted by Lumba Ogir
maxpou,
I`d go for a simple stage in keeping with this one.
Lumba, I'm happy to see you recommending JFET/bibolar CFP, the best input stage. Just make it differential, and everything's honky dory.
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Old 20th November 2008, 09:24 AM   #16
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Nelson,
I have been doing that for years. Now, how far are you prepared to go?
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Old 20th November 2008, 09:37 AM   #17
AndrewT is offline AndrewT  Scotland
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r14=0r0?
only 2.5V cascode voltage on the CFP?
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Old 20th November 2008, 09:42 AM   #18
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by maxpou
Hi guys,
i found this website for calculate the resistors for my shunt attenuator, but what's the best serie value and how many DB between each step because i have 24 step. Thank you! Maxpou

http://homepages.tcp.co.uk/~nroberts/shunt.html
that calculator does not make it easy to have constant Zin, nor does it take account of the Zin of the next stage.
Find a better calculator.
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Old 20th November 2008, 10:22 AM   #19
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Andrew,
R14 sets the (lowest) gain needed.
Quote:
only 2.5V cascode voltage on the CFP?
Right, it`s not much of a cascode voltage.
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Old 20th November 2008, 11:34 PM   #20
maxpou is offline maxpou  Canada
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Thank you AndrewT,
i have elma shunt step attenuator and i never used step attenuator before, somebody can tell me your value resistors please. Thank you! Maxpou
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