Re: triggering multiple devices

["Bob La Londe" <nospam@xxxxxxxxx>]

"Bill" <billnomailnospamx@xxxxxxxxx> wrote in message
news:7ktlllF3b8jc7U1@xxxxxxxxxxxxxxxxxxxxx

> Then best to install a "flyback diode" backwards on the relay coil. Relays
> when they are turned off will send out a pulse of electricity (which can
> damage electronics just like static from your hand touching the circuit
> board). If you install a diode backwards (- to the + connection), this
> will damper that pulse of electricity. This shows a diagram about half way
> down. Or search the page for the word "flyback"...
> http://www.siongboon.com/projects/2006-06-19_switch/

I install a diode on relays almost exclusively, but there are still some
MFGs who send MOVs to protect their equipment.  Is it just price?  Not that
diodes cost much...