This is a multi-part message in MIME format. ------=_NextPart_000_0009_01CA159C.D57D2370 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Reposted, this time with the schematic. Schematic also here: = www.chrisloper.com/low_side.png A few weeks back, I asked for advice on building an=20 H-bridge for an electric go-cart (24V 500W motor). Heeding the sage advice I received, I have instead built this=20 PWM'ed lowside driver using a 16F88 and an IRF540. low_side.png Running on my desk, with no load on the motor (drawing ~1A), it runs = great! I'm sure that there are all kinds of problems with it; I've never done anything like this before and I would appreciate any suggestions. I would like to test with a load, but haven't figured out=20 a way to do that yet. (The cart is not ready yet.) Anybody know how to put load on a 500W motor sitting on a desk? I know that driving the gate at only 5V is not good,=20 and I plan to replace the IR540 with a logic level FET. I did a search on Digikey and found this one: DIGIKEY IPP0165N03L G 30V 50A Rdson=3D.0065 $1.03 = http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=3DIPP065= N03LGIN-ND Datasheet: http://www.infineon.com/dgdl/IPP065N03L_rev1.02.pdf?folderId=3Ddb3a304314= 41fb5d01148c401f250e27&fileId=3Ddb3a30431441fb5d011492371ebc0fe2 One US dollar! It seems almost too good to be true.=20 Are there other parameters that I need to check? For the freewheeling diode, I'm using this one that I found attached=20 to a IRFZ34 scrounged from some unknown device a long time ago. It just says C8255 and I was unable to find a datasheet for it. I don't know if it is sufficient. I ordered a MBR2545CT (dual schottky rectifier, 25A 45V). Is that the right kind of diode for this application? What else should I do to protect my PIC from this high power stuff? Especially when I replace the 9V battery with a connection to +24V? 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