Someone from another forum is looking for a similar design. Can I send them to your site Bob? {slewrate} ----- Original Message ----- From: "Bob Blick" To: Sent: Sunday, March 09, 2003 10:48 PM Subject: Re: [EE] H-bridge problems > Hi Tom, > > Interesting that you've chosen to copy my H-Bridge but didn't use my > cool schematic or give me credit. No problem, but you really should visit > my site at least to read the extensive notes and see the real schematic > which doesn't have the errors in it yours does. > http://www.bobblick.com/techref/projects/hbridge/hbridge.html > > Cheerful regards, > > Bob > > > > On 9 Mar 2003 at 18:32, RADAR Engineering Team wrote: > > > I am using pwm to an H-bridge to drive a DC motor. I chose TIP145 and TIP140 because they can handle 15A max. I plan on using 2n5210 switching transistors to switch the TIPs. I want to switch at ~18-22kHz. My first question is can the 5210s switch fast enough (I could not find switching > characteristics) if not does anyone have a suggestion? I will be running the bridge at 48VDC, so the transistor must be able to handle it. Also, I used 2n2222s to test the circuit (using a 12VDC source) and I am steadily burning up transistors. I have attached the schematic. If anyone is able > to help I would appreciate it. > > Thank you, > > Tom > > > > RADAR Engineering Team > > Engineering Dept. > > Lake Superior State University > > 650 W. Easterday Ave. > > Sault Ste. Marie, MI 49783 > > > > PH: 906-635-2692 > > FX: 906-635-6663 > > > > radar@lssu.edu > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.