I guess I'm missing the point. Why is this better than using an L293D (500 ma) or a TI SN754410 (1000 ma) - augmenting both with inverters?? You still have to provide PWM - which probably means an external MCU, you get about the same response from the two chip setup, you have about the same number of wires going to the chip(s). I looked at this design, then the one I'm working on now and I have to use an inverter to get the effect I need (and I suspect you do with the Wirz version), but the overall cost is 4.50 in small quantities as opposed to 23.50. With the L293D/TI setup, you get both sign magnitude and anti-phase , .1" PC board pinouts etc, etc. Am I missing something very kewl? Dan ----- Original Message ----- From: John C. Frenzel To: Sent: Wednesday, September 29, 1999 10:15 PM Subject: Re: PIC motor control. > www.wirz.com has a inexpensive motor controller using an H bridge as a kit. > works well and is very reliable. > > ----- Original Message ----- > From: Andrew Hall > To: > Sent: Wednesday, September 29, 1999 8:35 AM > Subject: PIC motor control. > > > > Hi, > > > > I have a PIC controlled robot design which has a small 12VDC motor. The > > motor speed is controlled by PWM (PIC generated) into a logic level > > power FET. I now wish to be able to reverse the motor under control of > > the PIC but I don't like the idea of using a relay. > > > > I borrowed a FUTABA FET speed controller which worked well with the > > motor but I can't justify purchasing one for a small hobby robot. > > > > I have been told that a FET H-Bridge would be a possible solution. Are > > there any H-bridge designs available on the web ? Are there any > > alternatives to this type of circuit ? > > > > Any advice very much appreciated. > > > > Thanks > > > > > > Andy. > > > > > > -- > > Andrew Hall > > > _________________________________________________________ > Do You Yahoo!? > Get your free @yahoo.com address at http://mail.yahoo.com