i want to buy some Bulgin vandal resistant buttons to replace my existing power and reset case buttons, but after looking on farnell im not sure which type i need. Could anyone let me know what i need, and if its not too much of a mission briefly describe what the difference is between each of them in case i need any other type of switches for other purposes. The ones ive seen are: Single Pole SPCO SPNO SPNO Momentary SPNO/SPNC Thanks very much for any help
Think of it this way Normally opened = no connection therefore no circuit therefore not on. once you press it, the circuit is completed which allows the computer to start. momentarily = for a small part of time. therefore once it has turned the compuer on, it will not keep trying to turn the computer on. Its like an ignition in a car in a way.
OK so i'll use SPNO for both power and reset, but i've decided i'd like to use a matching button to turn all my case lighting on and off - am i right in thnking that i need SPNO/SPNC for this? Im assuming this means Single Pole Normally Open / Single Pole Normally Closed. Or do i just need a normal single pole one? Sorry for the simple question but all i know about electronics ive learnt in the last few days since i reistered here
Well that's not possible with that Bulgin momentary switch. You'll need a flipflop circuit to realise that.
Specsheet will perhaps mention that. But there's no way of dismantling the Bulgin without some serious hacking. It's anti-vandal resistant remember
ok cheers *off to google flipflop curcuit!* out of interest, what would happen if i were to put a button/switch on the +ve line that powered the lighting?
A common question on modding forums is "How do I switch my fans/lights/etc on and off with a single push-button switch?"
Excellent anwswer cpemma thats exactly what i needed! and youve even included a nice n00b friendly diagram alongside the scary looking curcuit diagram! Ill have to have a look round the rest of the site too. Thanks again
OK im going to go ahead and get the parts to make this curcuit, ive searched for them on farnell, but i just want to make sure ive definitely got the right stuff, is there any chance someone could have a look and make sure these are the correct things to buy: 4013B dual D-type Flip Flop, 14-pin DIL socket IRF530 n-channel mosfet 1M 0.25W Resistor 1k 0.25W Resistor 100k 0.25W This i have no idea about, i took a stab in the dark with it so this especially i could do with confirmation on: 100n ceramic disc or mylar film capacitor Also i see 2 components marked T1 & t2 on the picture of the curcuit board, but theres no reference to them in the pats list and they dont seem to appear on the curcuit diagram - I take it these are transistors - are these optional components? And im probably being a dumbass, but where does part Q, the IRF530 n-channel mosfet go? Is this in place of the transistors shown in the photo? One last thing, at the bottom of the article it says: "If you're wanting to switch a relay or other reactive load, a diode (eg, an ultrafast 1A 400v UF4004) should be connected across each pair of output terminals on rows 1 & 3, banded cathode end to +12v on row 1. They're not needed for brushless fans." How does this affect the cold cathode lighting that i'm intending to switch with it? do i need this extra component for that? Will this also work with LEDs/LED arrays? Sorry for being such a pain in the arse but ive never made anything like this before and i'd really like it to work right!
Your link is 100pF, you need 100nF =0.1uF Can't see cheap ones at Farnell, they're only about 6p even at Maplin. My bad, the schematic program (Circuitmaker) labels transistors Q, Stripboard Magic labels them T. T=Q, both are transistors. To cover anything you might connect I'd fit the diodes, they're only 9p each.
