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Old 8th June 2006, 07:41 PM   #1
athos56 is offline athos56  United States
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Default Making a step attenuator for a Chipamp

Ok Please look at my pic and see if I'm doing this right. 1) Signal comes in here. 2/3) the various resistors. 4a) Goes out to ground 4b) Goes around the switch to the out.

All well with this picture? Thanks for the help. First picture is how I'm going to lay it out
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Old 8th June 2006, 08:38 PM   #2
Nuuk is offline Nuuk  United Kingdom
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Please have a look at the references to building a stepped attenuator on my web site.
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Old 8th June 2006, 09:28 PM   #3
athos56 is offline athos56  United States
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Default I have

I looked at you site, still need to know if what I have above is correct. Thanks though.
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Old 8th June 2006, 09:56 PM   #4
Nuuk is offline Nuuk  United Kingdom
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Well, to be honest, I couldn't tell from that picture.

All you need to understand is the voltage divided concept. Signal goes in through one resistor and out through the other. Where the resistors join is where you make a connection to ground.
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Old 8th June 2006, 10:51 PM   #5
moamps is offline moamps  Croatia
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Hi athos:

From an electrical point of view, your resistor arrangement looks correct if I'm reading your picture correctly. But, from a designer point of view, it's not an optimal design because you have all the resistors all the time connected to the output with one lead. Those resistors can pickup surrounding noise, like small antennas. The standard approach might be better.

Regards,
Milan

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Old 8th June 2006, 10:53 PM   #6
athos56 is offline athos56  United States
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Default Thought about this some more...

Ok how about this.
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Old 9th June 2006, 01:22 AM   #7
athos56 is offline athos56  United States
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Question Ok moamps

Is this how I would do it then?
The signal (in) is connected to the copper ring on deck 3, goes through the resitor and either out to the chip amp or to the ground deck 4, through the resitor there and out to the copper ring on deck 4 which is the ground wire.

Another picture, green is copper ring, black lines are the resistors, I'm trying to make it clear.

Thanks for all the help
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Old 11th June 2006, 06:17 PM   #8
moamps is offline moamps  Croatia
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Hi athos:

I'm sorry for not getting back to you sooner. Things have been a bit hectic recently.

Yes, everything's alright now. You got it!

Regards,
Milan
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Old 11th June 2006, 09:15 PM   #9
athos56 is offline athos56  United States
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Default Thanks

I went ahead and put it together, posted the results here.
http://audiokarma.org/forums/showthread.php?t=72106

Here it is in the case ready for the chip amp to show up Thanks for the help!
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