Rotary stepped attenuator (series) instructions? - diyAudio
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Old Yesterday, 08:58 PM   #1
diyAudio Member
Join Date: Oct 2014
Default Rotary stepped attenuator (series) instructions?

First, I'm cheap.

Looking at gold point stepped attenuators I balked at the pricing.

I decided to see what people were saying about the cheap Chinese stepped attenuators on eBay.

I couldn't find much but after reading a lot on the gold point web site, I knew that the basis of a good stepped attenuator is a rotary switch with shorting contacts so I started looking for one and found a Centralab PA4002.

When I searched for that part number, I found an article from 1979 using that very switch as a stereo stepped attenuator.

The article was written by W. Marshall Leach Jr. and can be found toward the bottom of this web page:

Dr. Leach's Amplifier and Speaker Projects

It seems pretty straight forward but most things 35 years old need a little refresh.

If anyone has positive or negative opinions on this type of stepped attenuator or the switch I'm using, I would love to hear it.

Any way, I'm still cheap and I'm thinking I should buy a quantity of one resistor value to make a linear taper and use a law faking resistor to give it audio taper (idea borrowed from ESP).

That idea satisfies my cheap side, its less math and the parts order will be way easier.

That all seems like a good idea to me but once again I would love to hear some more informed opinions.

I've also got ideas for a cheap balance control but let's stick to the stepped attenuator for now.

Thanks for all the opinions and help.
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