I apologize if I missed some basic part of the problem, but is the transient the result of the fast rise or collapse of flux of the relay coil, which is what generates the transient spike? Or is the transient from something other than the relay coil? If the transient is not generated from switching the relay coil, can you please explain where the transient is being generated. Would this circuit still have the transient spike and the diode problem if there was no relay coil? What is the diode for if there is no relay coil? I thought that the coil would appear as a dead short for a very brief time before the flux density increased, and an inrush of current would rapidly expand the field. But perhaps I am wrong. I am curious, now. I would like to learn something. :-) Regards, Rich ----- Original Message ----- From: "David VanHorn" To: "Microcontroller discussion list - Public." Sent: Thursday, February 09, 2006 1:49 PM Subject: Re: [EE] Transient Suppression - was Re: [ee] 3904 base resistor > On 2/9/06, Rich Graziano wrote: >> >> The TVS is fast (Picoseconds). It is the diode of choice for protecting >> the >> transistor because it can shunt the transient before the transistor or >> FET >> is damaged. The idea is to be faster than the transient. > > > > I hate to keep yanking this chain, but I think the idea is not to generate > the transient in the first place. > > First rule of noise supression, Don't make it! > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist