DIYEFI.org Forum

It's a good hint to check what is done with the USB-shielding on your PCB: In noisy environments I noticed that it's better not to connect the shield with GND. On my own PCBs I keep the USB shield isolated from GND and only connected to case or other connectors shields. Just experiment - doesn't cos...

Great sense of humour.
Brilliant!

You appreciate what you had if you face to loose it ...

April fool's day?

Just found this:
http://www.freescale.com/files/analog/d ... 2_P812.pdf

ECU on a chip - single or twin cylinders only.
Interesting for some applications. Single cylinder offroad bikes come to mind, integration of ECU (and most sensors ...) in throttlebody.

Hi MrOnion,

the DC motor only moves the throttle stop.
To move the throttle stop in both directions you need a full bridge (aka H-bridge). Years ago I built one with 2 IRF7389 and this moved the throttle stop perfectly.

Cheers,
GJ

- Delete D43 and D44 as the LM2937 is already reverse protected - DONE 04/15/2012 Hi Andy, I highly recommend to keep them! Yes, the voltage regulators are reverse polarity proof - but the polarized caps (C12, C13) are not. Besides, the diodes help buffering positive voltage in the caps. Without, C...

In case of the BMW bikes, I'm absolutely sure.
Attached, you find a datasheet of the questioned TPS (in German, unfortunately).
See "Kennlinie 1 und 2" on page 2.

Cheers,
GJ

The sensors look pretty normal. Just read about his BOSCH TPS with two outputs. I know them very well, they're stock on fuel injected BMW motorcycles (R1100 ... R1150). I like the throttle bodies of this bikes for different reasons for my projects but regularly replace the stock TPS. The idea behin...

Lumpensack, why do you say "or even FTDI's famous ferrite bead" ie, why "or even"? Do you feel that it's inferior to a resistor? I'm curious! Good catch on the pull downs! Fred. Hi Fred, the ferrite is for sure the best solution, but sometimes hard to get (especially locally ......

Just looked over the schematics, here are the quirks I noted so far: - all pull-down resistors of the CPU should be tied to CPU-GND (i.e. not Output-GND) - upstream of the capacitors at the Vin pin of each voltage regulator there should be a schottky diode like SS12 or SS24. This will prevent bleedi...