Im considering making a thing, wtih my computers power supply which can change the output voltage of the 12v 5v connectors of a molex power supply, and changing it to one of these female jack thingie which you can plug into various things like clock, speakers and such! I was just wondering whether i should be worrying about the current through the computer, whether its likely to be too high for most things to be able to take, or too low and such! Im thinking of making it controllable using dip switches and loads of resistors in series... i.e. dip 1 : 1 OHM dip 2 : 2.2 OHM dip 3 : 10 OHM dip 4 : 100 OHM and if you switch 4 and 1 you get 101 OHMs. I can probalbly work out a way to do this (in fact im pretty sure i can ). Im just worryed a bit about the current
Wow, your wording is so vague I'm not even really sure what your question is. But I can tell you this, using resistors to change voltages is not really a feasible approach except if you know exactly the current and voltage of your load (like you sort of do with an LED*). So I think your design is kind of misguided from the outset, although I can't comment on the particulars. * in theory you know one point along the I-V curve, this is what I'm talking about.
Do you mean like adaptor plugs, like the adaptors to plug say your personal CD player or nokia mobile phones into (the nokia plugs a a wee smaller). If so you can buy these from maplins, code is A85AB and is described below, PC POWER SUPPLY CARD • Universal power supply for PC peripherals like loudspeaker, modem, scanner and external drives • Power saving - peripherals will be switched off together with your PC • Output voltage: 3,4.5,5,6,7.5,9 and 12V • Maximum output current: 2.2A, • 4-fold connecting plug, 2 jack plugs 2.5 and 3.5mm, 2 DC plugs 2.1 x 5 and 2.5 x 5.5mm • Polarity switch-selector • Connected to PC power supply • Internal power supply cable included Exact appearance may vary. Rusty
i wanna make one though and yes i do mean them things you plug the little cd playermobile phone jacks into i might just see if i can borrow an ammeter from college and test it myself
