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MagnumOpus 16th April 2012 09:01 AM

Poles and throws?
 
I am putting together a volume buffer and source selector.
However, I am utterly confused as to what switch I need. I want to be ablee to have 3 inputs.

jan.didden 16th April 2012 09:06 AM

Quote:

Originally Posted by MagnumOpus (Post 2987173)
I am putting together a volume buffer and source selector.
However, I am utterly confused as to what switch I need. I want to be able to have 3 inputs.

If you want to switch three signals you need three poles.
Assuming you want to use a rotary switch, it should of course have three positions, which means you need three throws. However, with rotary switches you normally don't talk about throws but about psositions. What you need is a three-pole, three-pos switch.

If you have rocker or tumbler switches you talk about throws. A tumbler with an on and an off position is a single throw, with one on and another on position it is double throw.

hope this helps,

jan didden

DigitalJunkie 16th April 2012 09:56 AM

Looking at the schematic symbols for various switches might help shed some light also.

3 inputs that you can select from?
I assume this is 2 channel (stereo)?
Then you'd need 2 poles,with 3 throws. (DP3T)

jan.didden 16th April 2012 09:58 AM

Quote:

Originally Posted by DigitalJunkie (Post 2987204)
Looking at the schematic symbols for various switches might help shed some light also.

3 inputs that you can select from?
I assume this is 2 channel (stereo)?
Then you'd need 2 poles,with 3 throws. (DP3T)

You're right, I had it wrong. Sorry.

jan

MagnumOpus 16th April 2012 11:10 AM

So either a dobbelpole trippel throw rocker switch or a dobbel pole 3 position rotary.

Thank you very much!

AndrewT 16th April 2012 11:33 AM

Triple throw rocker would be very unusual. You can buy triple position rocker with a centre detent. But inside there are only two active connections.

sreten 16th April 2012 12:07 PM

Hi,

You might find that the basic rotary switch available is 4 pole 3 way,
(other versions being 1 Pole 12 way, 2 Pole 6 way, 3 pole 4 way).

Just double up the connections.

rgds, sreten.

MagnumOpus 16th April 2012 12:15 PM

Quote:

Originally Posted by sreten (Post 2987326)
Hi,

You might find that the basic rotary switch available is 4 pole 3 way,
(other versions being 1 Pole 12 way, 2 Pole 6 way, 3 pole 4 way).

Just double up the connections.

rgds, sreten.

How do mean? Double up the connections?

DF96 16th April 2012 12:50 PM

Wire two sections in parallel. Not really necessary as it would be simpler to just ignore unwanted poles, but you halve contact resistance (and double stray capacitance).

Etocynned 16th April 2012 02:12 PM

Am thinkin of just this thing myself.

can someone post a link to a 3 position stereo knob i can buy?
I cant seem to find them anywhere.


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