12V/7V switch behaving strangely
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Author:  Oz [ Wed Oct 23, 2002 12:10 am ]
Post subject:  12V/7V switch behaving strangely

Hey there,

I followed the 12V/7V switch building guide to switch some fans between 12V and 7V. I've got 2 fans connected to it: a panaflo and a zalman. It works really well, but there's just one problem - sometimes when I switch from 12V to 7V, my screen goes black for an instant, and then re-appears! This only happens sometimes, and I've only noticed it going from 12V to 7V and not vice versa. Could this be causing the same kind of problem with harddrives/other devices, in which case it could be detrimental? I've not noticed any corrupted files or anything. Yet ;). Any ideas?


Author:  quokked [ Wed Oct 23, 2002 12:46 am ]
Post subject: 

hmmm... that is odd... could be a few things if your computer isn't totally dieing on u... could be your video card cutting out and coming back into it causing the screen blanking....
ummm this is a very odd thing though, I'd try to switch to another fan quietening method like a baybus or a rheostat to turn the fans down. :)
it would be determintal I think personally not good having your screen go crazy like that often :)

Author:  MikeC [ Wed Oct 23, 2002 12:56 am ]
Post subject: 

If you built a 12/7V switch, it's not something we ever did an article about here. It IS possible to do -- even 12-7-5V is easy -- but the article here describes a 12/5V switch. The behavior you describe is odd; really tough to diagnose remotely...

Author:  Oz [ Wed Oct 23, 2002 6:14 am ]
Post subject: 

Woops sorry, I meant a 12V-5V switch! It's quite odd really... It has only happened a handful of times as well. I think I'll pretend it never happened ;)


Author:  quokked [ Wed Oct 23, 2002 6:19 pm ]
Post subject: 

lol 12-5V maybe would mean that u've got sparking along the switch, all switches are not perfect u'll get what's called "bounce" , it kinda looks like squgggle and slowly get's smaller think of a boucing ball and the look that'd make, that might be what's causing it :)

Author:  TerryW [ Tue Oct 29, 2002 5:16 pm ]
Post subject: 


Sorry for not responding to this thread B4 now. This problem could be the switch type.

When ordering switches you need to be carefull in the type of switch you request. Some are "make B4 break" and others are "break B4 make".

An easy understanding: "make B4 break" means the internal switch contacts "make" another connection, B4 they switch or "break" the first connection. Most "make B4 break" switches are rotary switches, used for audio applications.

Any switches to do with power supplies should be the "break B4 make" variety.


Author:  quokked [ Tue Oct 29, 2002 5:39 pm ]
Post subject: 

so the setup is "make or break" isn't it? :lol: sorry couldn't resist :)

Author:  Oz [ Wed Oct 30, 2002 1:08 am ]
Post subject: 

Ah ok thanks TerryW!

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