[chbot] 12V driver

[Charles Manning]

L293DD looks like a very elegant solution.

ULN2003 is a low side driver. Careful using these... If you're just using
it to switch on a load without any other IO (or completely isolated IO then
they're OK. But if you're switching on anything that has IO wires then low
side switching is bad, bad, bad because the switched device will try to
find ground via IO wires causing problems.


On Mon, May 24, 2021 at 1:14 PM hamster at snap.net.nz <hamster at snap.net.nz>
wrote:

> I have been using L293DD. Up to 32V and 600mA, and seperate 4 channels in
> easy SMD package.
>
> I have a few spare and a suitable PCB to drive 16 channels of LED lights
> if you want to experiment. It has a Pi Pico footprint on it but that isn't
> a big issue.
>
> The PCB is useful as the need to sink a bit of heat into the PCB's ground
> plane.
>
> Mike
>
>
>
>
> -------- Original message --------
> From: Mark Atherton <markaren1 at xtra.co.nz>
> Date: Mon, 24 May 2021, 12:34 PM
> To: Christchurch Robotics <chchrobotics at lists.linuxnut.co.nz>
> Subject: [chbot] 12V driver
>
> Andrew,
>
> After all that I forgot...
>
> ULN2003 - seven drivers in a 16 pin DIP, Jaycar ZK8855, $5.90 ea.
>
> 5V in, capable of switching 500mA at 50V. Built in back EMF diode (tie
> pin 9 to the positive rail associated with the load).
>
> -Mark
>
>
>
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