wild foamy Posted November 20, 2008 Posted November 20, 2008 hi there all. im looking to build a simple 6VDC to 12VDC step-up transformer for using things like phone chargers and camera chargers from the 6v supply on my bike. i know i wont get high outputs but i am looking to get something like 400mah out of it. i have basic knowledge in electrical engineering but i need a bit of help drawing up a schematic diagram. anyone have any ideas? regards Steve
Moderator Airhead Posted November 20, 2008 Moderator Posted November 20, 2008 hi there all. im looking to build a simple 6VDC to 12VDC step-up transformer for using things like phone chargers and camera chargers from the 6v supply on my bike. i know i wont get high outputs but i am looking to get something like 400mah out of it. i have basic knowledge in electrical engineering but i need a bit of help drawing up a schematic diagram. anyone have any ideas? regards Steve You cant do it with a transformer as such, what you will have to do is use another rectifier diode and a 12v regulator connected in parallel to your existing 6v units
wild foamy Posted November 20, 2008 Author Posted November 20, 2008 okay, any idea how that would look as a schematic?. would the 12v regulator work if the input voltage was less than its output? not sure where the rectifier would come in though, was planning to wire it straight onto the battery (which although is not very big, is constantly being fed by the mag) then using an isolator switch to cut the 12v feed when the engine is static. so wouldnt the battery be providing a DC voltage?
Moderator Cynic Posted November 20, 2008 Moderator Posted November 20, 2008 Sounds like disposable batteries for the camera and payphones are going to be the way to go.
wild foamy Posted November 20, 2008 Author Posted November 20, 2008 oh, so it can't be done? this is all in prep for my ireland tour, i want it to get everything sorted now so that i know it works and i can test it out before i go... and tbh i dont want to have to keep changing batteries all the time, especially if its something like a video camera.
Moderator Airhead Posted November 20, 2008 Moderator Posted November 20, 2008 okay, any idea how that would look as a schematic?. would the 12v regulator work if the input voltage was less than its output? not sure where the rectifier would come in though, was planning to wire it straight onto the battery (which although is not very big, is constantly being fed by the mag) then using an isolator switch to cut the 12v feed when the engine is static. so wouldnt the battery be providing a DC voltage? You need a seperate circuit as your battery is held at 6V, I dont know if this could be done and the drawing has turned out crap, but if you have an understanding of electrical engineering, my thoughts are this, obviously it will only work when the output from the magneto is above 12v
wild foamy Posted November 20, 2008 Author Posted November 20, 2008 but thats the thing, the mag is 6v and so is the battery, but would it be possible to step it up to 2v at the expense of reducing the amperage output? alternatively i could carry a small 12v Lead-acid type battery (7ah or around that) and run everything off that, just a matter of keeping it charged without getting into expensive solar panels and the like
Moderator Airhead Posted November 20, 2008 Moderator Posted November 20, 2008 but thats the thing, the mag is 6v and so is the battery, but would it be possible to step it up to 2v at the expense of reducing the amperage output? The mag will give out more than 6v as the revs increase, for example the mag on a 12v bike will give 50v at high revs...its the regulator that holds these voltages down, i dont know what the mag on the 6v bike will give, neither do i know of anyone doing this, or indeed if it would work, but that'd be the way i would try.
wild foamy Posted November 20, 2008 Author Posted November 20, 2008 okay, how about running a 6v regulator on parallel from the mag and then using that stable 6v voltage to get up to 12v?
Moderator Airhead Posted November 20, 2008 Moderator Posted November 20, 2008 okay, how about running a 6v regulator on parallel from the mag and then using that stable 6v voltage to get up to 12v? Schematic?
wild foamy Posted November 20, 2008 Author Posted November 20, 2008 will see what i can do for ya. i didnt fully think it through, got as far as adding a 6v regulator in parallel with the rest of the 6v system.
Moderator mervin Posted November 20, 2008 Moderator Posted November 20, 2008 Forgive me if i am wrong but are not most things like cameras phones etc 6v anyhow ?? merv
Moderator Airhead Posted November 20, 2008 Moderator Posted November 20, 2008 Forgive me if i am wrong but are not most things like cameras phones etc 6v anyhow ?? merv Worth checking Merv, ive been looking at my idea and its not good, I think the foamy one is looking to use a cigarette lighter socket adapter for his gadgets though. If you are right it would be easier to chop the 12v units and wire up to new socket via a fuse to bike battery.
wild foamy Posted November 20, 2008 Author Posted November 20, 2008 yeh i was planning to use a 12v cigarette lighter type charger for charging my camera and phone e.t.c my phone is 3.7v and my video camera is 7.2v, both are Li-Ion batteries so im not sure i would be confident DIY'ing chargers
Moderator mervin Posted November 20, 2008 Moderator Posted November 20, 2008 Maybe worth a look around VW beetle websites as the early beetels were 6V Merv
Moderator Airhead Posted November 20, 2008 Moderator Posted November 20, 2008 Maybe worth a look around VW beetle websites as the early beetels were 6V Merv This is my latest offering, it uses the negative half cycles from the magneto, i dont think the first attempt would work, with this one you wouvd connect the positive centre pin to bike chassis and the socket outer to -12v fuse, i am not an electronics expert so any comments will be welcome
Moderator Cynic Posted November 21, 2008 Moderator Posted November 21, 2008 Honestly i think this is a bad move, i dont know if you have a lighting /charging coil or separates but they will have very little to spare and electrical loads will rob you of the HP you have got from your sports bits and bobs. Do you really want to blow out your stator coils somewhere in nowhere. If you are going on a tour surely reliability is the most important factor then weight with space a close third, my mobile will do all week without charging and does video and pics, its charged in an hour or so, one or two stops where you have access to plug it in would be it, that would leave your bikes electrics to do only what it has to.
wild foamy Posted November 21, 2008 Author Posted November 21, 2008 hmm... you do have a good point... will leave it for now
Moderator Airhead Posted November 21, 2008 Moderator Posted November 21, 2008 Honestly i think this is a bad move, i dont know if you have a lighting /charging coil or separates but they will have very little to spare and electrical loads will rob you of the HP you have got from your sports bits and bobs. Do you really want to blow out your stator coils somewhere in nowhere. If you are going on a tour surely reliability is the most important factor then weight with space a close third, my mobile will do all week without charging and does video and pics, its charged in an hour or so, one or two stops where you have access to plug it in would be it, that would leave your bikes electrics to do only what it has to. Aaah, the voice of wisdom! Spoil sport Anyway Steve....About that tubo charger
wild foamy Posted November 21, 2008 Author Posted November 21, 2008 Anyway Steve....About that tubo charger Not at the moment, OG... im busy fitting my Nitrous kit
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