[chbot] PCB Power Supply.

[william fleete]

I’ve started to use TVS diodes on anything remotely touching automotive
power
With input diode to knock out reverse spikes or reverse connection and self
resetting fuse if the TVS shunts or shorts out. and for 12v level signals
in addition to a transistor, buffer gates to somewhat isolate the 12v
levels from logic level stuff. I did that on a clock I designed for my
mum’s Honda which didn’t have a dash clock.

On Fri, 8 Nov 2024 at 10:46, Martin Towers <tinytowers at xtra.co.nz> wrote:

> I used to make gizmos for the car. They worked fine on the bench and
> blew up in the car. In a real car with a lead acid battery and
> alternator there are a lot of spikes and surges from all the inductive
> loads going on and off. Dirty battery contacts will blow things up.
>
> Since then things seem easier. Semiconductors are harder. The regulator
> xl1509 will survive up to 45V and that should be enough most of the
> time. There is reverse voltage protection.
>
> The CAN interface is just a conversion to the CAN dominant-recessive
> electrical system. You can use the ESP32 TWAI controller to monitor the
> CAN bus.
>
> So it's a good plan.
>
> Martin
>
> PS
> Let us know what colour the smoke is.
>
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