[chbot] PCB Power Supply.

[Daniel Powell]

Thanks for the pointer William. Now investigating TVR diodes.

Cheers,
D

From: Chchrobotics <chchrobotics-bounces at lists.ourshack.com> On Behalf Of william fleete
Sent: Friday, 8 November 2024 3:49 pm
To: Christchurch Robotics <chchrobotics at lists.ourshack.com>
Subject: Re: [chbot] PCB Power Supply.

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<mailto: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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