Help Keep Boards Alive. Support us by going ad free today. See here: https://subscriptions.boards.ie/.
If we do not hit our goal we will be forced to close the site.

Current status: https://keepboardsalive.com/

Annual subs are best for most impact. If you are still undecided on going Ad Free - you can also donate using the Paypal Donate option. All contribution helps. Thank you.

https://www.boards.ie/group/1878-subscribers-forum

Private Group for paid up members of Boards.ie. Join the club.

Vandal proof switches

Prosta · 2004-10-05 16:00:00

Been looking at the Vandal proof switches in maplins. http://www.maplin.co.uk/Module.aspx?ModuleNo=12203&TabID=1&source=15&WorldID=&doy=5m10 Got 1 elsewhere but I have no clue how I'd wire it up. Anyone else used these? I dont want to blow the led by giving it too much juice. Says something like 2v@2ma. Do I have to stick…

05-10-2004 05:00PM

#1

Prosta

Registered Users, Registered Users 2 Posts: 165 ✭✭

Join Date: February 2004

Posts: 145

Been looking at the Vandal proof switches in maplins.
http://www.maplin.co.uk/Module.aspx?ModuleNo=12203&TabID=1&source=15&WorldID=&doy=5m10

Got 1 elsewhere but I have no clue how I'd wire it up.
Anyone else used these? I dont want to blow the led by giving it too much juice.
Says something like 2v@2ma. Do I have to stick a resistor on the wire or wha?

0

Comments

#2 05-10-2004 06:50PM

Capt'n Midnight

Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 96,053 Mod ✭✭✭✭

Join Date: March 2003

Posts: 94290

yes you need a resistor.

12V supply => 12-2=10V to be dropped => 10V = 2mA x 5 K ohms
5V supply => 5-2=3 to be dropped => 3V = 2mA x 1.5 K ohms

E&OE

if an AC supply a diode too.

0