How to interface (physically) a car fuel sender

M

MartinM57

Moderator
The simple emitter follower regulator (plus an inductor) is certainly a minimal solution and is essentially what 78xx regulators have inside them (plus a feedback loop for better regulation). Would, again, be interesting to build and scope it to compare.

My favourite automotive regulators list:
- low power circuit - LM2940, LM2937
- high power circuit - LM2575

78xx are not on my list at all ;)

EDIT: the series diode/12v zener combination downstream of the reverse polarity protection diode has always struck me as interesting. If 0v is 0v at all times, what does it do? At the risk of the angst of the forum, I don't use those components (but I do use a varistor in that position instead) :)
 
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D

Dippy

Moderator
"Surely any switching regulator will be isolated enough"
&
"Since all the output current from a switcher comes from the magnetic field stored inside the internal inductor, there is no direct connection (except ground) between the input and the output."

-There are loads and loads of switcher designs. Some isolated, some not.
You can't just make a sweeping statement like that Boriz. (Youngsters are watching:) )
Have a read through some design studies and you'll see.


That's a nice spec JJ.
It certainly does everything you need if you surround it with suitable components.
Most designers like to (have to) add belts and braces.
Incidentally, what's it's usual failure mode?
You need to add a few more bits and pieces to allow for a few 'what ifs'.
 
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