banneduser Posted July 20, 2003 Posted July 20, 2003 I'm planning on building a fuse into my midibox, I like to be sure :D Does anybody have an idea at what kind of current the fuse should snap?
pilo Posted July 21, 2003 Posted July 21, 2003 aa weell I put a 1A... just in case of some thing go really wrong..to calculate good value :mesure the current flow under 5V, and if you have 220V input (like in europe), then muliply the current by 5/220... I think I'm right, but not sure! ;)
banneduser Posted July 21, 2003 Author Posted July 21, 2003 Wont the rectifier be fried long before 1A is reached?
pilo Posted July 21, 2003 Posted July 21, 2003 yes... 1A under 220 makes about 44A under 5V :) but if there's a short circuit... ;D
pilo Posted July 21, 2003 Posted July 21, 2003 You're right, when I have all my module I will put a 250mA fuse on the 220 sector! it will be safer!!
banneduser Posted July 21, 2003 Author Posted July 21, 2003 I think i'm going to use something like a 2,5A fuse in the 5v area.
pilo Posted July 21, 2003 Posted July 21, 2003 huumm yes, but don't forget to put a fuse for the 220... it's a protection, if there's a short after the transformer!!!
banneduser Posted July 21, 2003 Author Posted July 21, 2003 I will be using a wall-adapter, so i cant modify that ;)
pay_c Posted July 21, 2003 Posted July 21, 2003 I always check the current like that: I dont switch on (the fuse holder is right behind the switch and shortened) and measure the current between the both pins of the switch (so the MB comes on).Then I just put all LEDs on, the luminence of the LCD to the max and so on and take the current as a basic number. Meaning: If I read like 200-300 mA I use a 500 mA Fuse, if I read 500-800 then 1A and so on.I always put the fuse behind the wall-adapter, as the most adapters already have short-protection inside.Hope that helps somehow.
pilo Posted July 22, 2003 Posted July 22, 2003 oh yes it help! I must be stupid, but mesuring the current on the switch is a great idea!... (I make diy stuff for about 4years now.. ;D.. then I must be stupid!)
nILS Posted July 27, 2003 Posted July 27, 2003 Erm, imho we have 230 and not 220 Volts, right? Just for the calculations...Fuses are cool. 8)
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now