Calculation of stepped shunt attenuator - diyAudio
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Old 17th November 2005, 09:09 PM   #1
Mick_F is offline Mick_F  Germany
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Join Date: Jun 2005
Location: Cologne
Default Calculation of stepped shunt attenuator


may I turn your attention to an Excel spreadsheet I created for the calculation of resistor values for stepped attenuators in shunt (i.e. voltage divider) architecture. This is the type of attenuator Nuuk describes on his excellent website to use with his Gainclone (pre).

The spreadsheet allows to take an input ground resistor or additional parallel ground resistor (for break-before-make switches) into account.
You can calculate the resistor values according to the desired attenuation steps and, in a second step, recalculate the attenuation curve with any (standard) resistor values. It also calculates the impedance of the attenuator for each switch position.

The file is of course also accessible through my website . Please feel free to play with the spreadsheet. I am grateful for your comments or suggestions.

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Old 24th January 2014, 05:43 PM   #2
udailey is offline udailey  United States
diyAudio Member
Join Date: Mar 2008
Mick I want to extend the number of steps to 24. Can you provide the password to the spreadsheet?
purchase LDRs anytime Also try my Resistor Replacers or LDR based Input Selector Email me.
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Old 25th January 2014, 10:49 AM   #3
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Set the password to "blank", i.e. no key is pressed. and repost the sheet.
That way everyone can access the spreadsheet and still retain the "protection" from inadvertent mis-keying during normal use.
regards Andrew T.
Sent from my desktop computer using a keyboard
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