Recent content by bjosta

No, your schematic is all wrong :) Your pots are not used at all in that picture, the wire runs straight back to the controller, that won't accomplish anything. You need to run you "ground" and "high" wires through your resistors, like the picture posted here...

Nominal voltage for LiFePO4 is somewhat lover than 3.7, more like 3.2-3.3

Doh! Missed that post :oops: Will you run the light on your main batteries or from a smaller pack? will the light housing hold the battery? Yes please do post more photos when you have it back, it's almost exactly the design I had in mind, but I haven't see anything likes this available. I've...

Sweet bike! Your front light alu housing, is that something you made yourself or is it bought? Any more pictures of it?

Hmm, I don't get it :) If you build a circuit to limit yourself to 12A and 25kph, why not just build a legal kit, with a 12A controller and choose your battery voltage to get a ~25kph top speed? I'm not trolling your thread here, I just don't get it :?

Jeremy, this is awesome stuff, thanks allot for sharing. I was thinking of a adapting this idea to something simpler (hopefully :), I could be wrong on that part). Instead of running the "mains" power up to this circuit for switching it on/off I could just run my throttle signal through here...

That's not the phase wire test I was talking about. To exclude the possibility of shorted phase wires you need to do the following:

Have you actually done the phase wire test mentioned several times in this thread? If you have then just say so :mrgreen: It feels like you have decided that's not the cause but never said that you confirmed that it is not. Not trying to be an ass, just curious :)

I heard it doesn't measure small currents like micro and milli amps, is that true? If so that's a shame, then you cant measure balance currents, drain currents of controllers etc.

Well then my suggestion is, in order of increasing cost and increasing quality (not necessarily accuracy) Vichy VC99 Chinese Fluke model 17B "real" entry level Fluke, I was going to say Fluke 117, but that might not be so god for ebike use, doesn't measure mA for example.

I have 2 multimeters, one $10 cheap version bought locally at a radio shack equivalent and a cheap $37 china ebay model (Vichy VC99) I have measured both against a true 5v reference (http://www.voltagestandard.com/DMMCheck.html) The $10 version only reads 2 decimals at 5v but it consistently...

Would it really be easier? Seems like a lot of electronics and engineering for solving a tiny inconvenience :) You could get 10 of these http://www.voltagestandard.com/DMMCheck.html I have one and it's awesome.

Wiring looks correct. You put the black one on COM and red on T+ (also says V) *edit* And if you have a CA you don't need to mess with different wiring harness for parallel/series connection for added rage, just set you max amps and max speed with the CA, simple and effective :D

Hmm yeah, it might be the photo, at first it did look like mark5 said. Usually you plug the black probe to COM and then move the red depending on if you are going to measure volts or amps. But like I said, I don't know your MM, if it's measuring voltage now it obviously works :)

I don't know that multimeter but you have nothing connected to the COM port, that seems odd...