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Old 12th June 2005, 02:23 AM   #1
Thunau is offline Thunau  United States
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Default Help with switch selection and wiring needed

Would some one help me select the appropriate switch and show me how to wire it, please?

Here is my situation:
I have designed a passive frequency shaping circuit for my AKG K-1000 headphones. It consists of a R/L low pass, zobel and an L-pad.
I would like to be able to simultaniously switch both resistors in the L-pad and the resistor in the R/L. I need at least 4 positions- all in stereo. The last position should allow me to bypass the R/L alltogether. I'm looking at 2W tops passing through the switch.
Can you think of such switch/wiring? Or should I think relays?
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Old 12th June 2005, 02:42 AM   #2
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Should be easy enough. Just tell us what you want in each of the 4 positions. If there is anything that should be in all 4 positions, tell us that also.
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Old 12th June 2005, 03:25 AM   #3
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Thanks Bill,
Here is the schematic of one of the positions . R1041, 1061 and 1071 change (all three simultaniously). The rest stays put. It would be nice If I could also change the inductor in one of the positions (add a small one in series with the main one?)

Click the image to open in full size.
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Old 12th June 2005, 05:09 AM   #4
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Let me rephrase my original request.

List the elements you want in the circuit in:

Position 1:
Position 2:
Position 3:
Position 4:

And keep it in this thread, not the other. BTW, why don't you do this yourself? Is it too confusing or what?
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Old 12th June 2005, 05:52 AM   #5
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Bill, the circuit stays the same in all four positions. Only values of the 3 resistors change. So, in position "1" R1041 might be 30 Ohm while L-pad values are 36 Ohm and 200 Ohm. In position "2" R1041 is 46 Ohm and the L-pad consists of 20 Ohm and 120 Ohm and so on. It's really not that important what the values are, what I'm looking for is help with the selection of the proper switch (I assume a rotary multidecker with 4 positions?) and some idea how to wire it up. Once I get started I can figure out the rest but there are 1000 switches at Mouser and I have no experience selecting the proper one.
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Old 12th June 2005, 06:41 AM   #6
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4 pole, 4 position.
Shorting or non-shorting is up to you.
Attached Images
File Type: gif switch.gif (4.1 KB, 110 views)
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Old 12th June 2005, 06:19 PM   #7
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Thanks Bill. This is very nice. Would you know a good source fo such switches? I guess shorting style is better for audio because it avoids clicks and pops.
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Old 12th June 2005, 08:27 PM   #8
Thunau is offline Thunau  United States
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I found this on the web:
Click the image to open in full size.
The description is :"4 pos, 2 poles per deck, 8 decks"
I guess I can run 2 decks paralell to achieve 4 poles and use up total of 4 decks for stereo, or use 1 pole per deck and utilize all 8 decks. The price is certainly right- only $8.00
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