Calrec - switches
« on: November 11, 2004, 09:06:33 AM »
Forgive me for being really thick but I can't seem to understand the following...

The original Calrec had what seemed to be on/off switches for what I assume to be:

LF - HPF and Hi-Q/normal Q?
LMF - Hi-Q/normal Q?
HMF - Hi-Q/normal Q?
HF - LPF and Hi-Q/normal Q?

NGRecordings web site..
http://www.nrgrecording.de/html/calrec.html

Has what I assume to be versions of the original - but using toggle switches

The Gyraf ones use..
A 2 pole latching for the Hi Q setting
A 4 pole latching for the HPF, LPF and Bypass...

Just out of interest - why is there a 4 pole latching used - is this because multiple PCB tracks need to be switched in/out
Could this be solved by using a 2 pole and taking two leads of the contact..

because I want to use an illuminated switch here I am getting confused with the terminology

A 2 pole latching - in this sense - is this is the same as a 2NC or in toggle switch terms DPST??

Any product numbers from farnell or rs would be most grateful - I can;t figure out which reasonablly priced EAO switches I can use


gyraf

Calrec - switches
« Reply #1 on: November 11, 2004, 09:19:38 AM »
Hi UK,

Take a look at the schematic - that explains why 4-poles are necessary..

Jakob E.
..note to self: don't let Harman run your company..

Calrec - switches
« Reply #2 on: November 11, 2004, 10:35:52 AM »
Gyraf
Had a look at the schematic - and I actually understood what I was looking at. (I must be learning something)

Looking at it I think I can still do it with a 2 contact switch but have three wires coming from each contact into the 6 points on the PCB
I am on the right track aren't I??


 

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