<div dir="ltr"><div>L293DD looks like a very elegant solution.</div><div><br></div><div>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.</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 24, 2021 at 1:14 PM <a href="mailto:hamster@snap.net.nz">hamster@snap.net.nz</a> <<a href="mailto:hamster@snap.net.nz">hamster@snap.net.nz</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">I have been using L293DD. Up to 32V and 600mA, and seperate 4 channels in easy SMD package. <div><br></div><div>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. </div><div><br></div><div>The PCB is useful as the need to sink a bit of heat into the PCB's ground plane. </div><div><br></div><div>Mike</div><div><div><div><div><div><br><br></div></div></div></div></div></div><div style="line-height:1.5"><br><br>-------- Original message --------<br>From: Mark Atherton <<a href="mailto:markaren1@xtra.co.nz" target="_blank">markaren1@xtra.co.nz</a>><br>Date: Mon, 24 May 2021, 12:34 PM<br>To: Christchurch Robotics <<a href="mailto:chchrobotics@lists.linuxnut.co.nz" target="_blank">chchrobotics@lists.linuxnut.co.nz</a>><br>Subject: [chbot] 12V driver<br><blockquote>Andrew,<br><br>After all that I forgot...<br><br>ULN2003 - seven drivers in a 16 pin DIP, Jaycar ZK8855, $5.90 ea.<br><br>5V in, capable of switching 500mA at 50V. Built in back EMF diode (tie <br>pin 9 to the positive rail associated with the load).<br><br>-Mark<br><br><br><br>_______________________________________________<br>Chchrobotics mailing list <a href="mailto:Chchrobotics@lists.ourshack.com" target="_blank">Chchrobotics@lists.ourshack.com</a><br><a href="https://lists.ourshack.com/mailman/listinfo/chchrobotics" target="_blank">https://lists.ourshack.com/mailman/listinfo/chchrobotics</a><br>Mail Archives: <a href="http://lists.ourshack.com/pipermail/chchrobotics/" target="_blank">http://lists.ourshack.com/pipermail/chchrobotics/</a><br>Meetings usually 3rd Monday each month. See <a href="http://kiwibots.org" target="_blank">http://kiwibots.org</a> for venue, directions and dates.<br>When replying, please edit your Subject line to reflect new subjects.</blockquote></div>_______________________________________________<br>
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