Two general switching questions

[axg20202]

OK, here goes. The first one is probably pretty basic, the second more tricky (but possibly idiotic ).

1) If I have a switch that has NO terminals as well as NC terminals, can it be used as an SPDT?

2) If I have a simple SPST switch, is there any way, e.g. by using a relay, I can turn it into a SPDT?

[Mark Hammer]

OK, here goes. The first one is probably pretty basic, the second more tricky (but possibly idiotic ).

1) If I have a switch that has NO terminals as well as NC terminals, can it be used as an SPDT?

That would depend.  In my experience, switches that indicate NO and NC are momentaries.  You could certainly use it to actuate a relay for SPDT purposes, but on its own I don't think so.

2) If I have a simple SPST switch, is there any way, e.g. by using a relay, I can turn it into a SPDT?

Yes, and in fact many switching schemes use it in exactly that way.  Check out "The Tone God's" page on "wicked switches" ( http://www.geocities.com/thetonegod/switches/switches.html ) and RG Keen's page on relay-switching: http://www.geofex.com/Article_Folders/relays/relays_for_switching_audio_signa.htm

[axg20202]

Wow, thanks for the speedy response. The NO.NC switch I have in mind is actually on the back of a pot, so I'm guessing it would not be momentary. What do you think....it's on fleabay:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=160145728390&ssPageName=STRK:MEWA:IT&ih=006


As for the second response, that's great. I'll check it out.