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Asked — Edited

Types Of Circuits To Drive Relays

this post was for JOSH'S saltware tank design
but i making this one for others about using mosfets instead of power transistors
using power transistors for switching high current circuits is very old school.

I would use mosfets to turn on the relays,first i see you are using high current coils on the relays
Second on using mosfets you dont need a kickback diode on the relay,few other item about using mosfets instead of transisors less heat ,easy to use then transistors,and lower current drive
MOSTLY nobody uses transistors any more
best way instead of relays if switching AC lines is SSR or reed switch,relays are bad because of RFI across the contacts,
Switching DC no RFI problems but higher current
SIMPLE SSR is a traic,cap and optocoupler with a led control ,also its well isolated

here is a simple SSR using a very common MOC3011 optocoupler and can drive straight from digital output

MOC3011 SSR circuits


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Your becoming a piller for this Forum robotmaker..I have just bookmarked this thread:) I hope in time ,I too will be a contributer of good information.
IROBOT58 I can design almost any type of electronic design,and my info is always free
JUST dont ASK me about programming not great at it,only arduino,and AI SOFTWARE called LISPWORKS:D
Awesome!:) I know you have a "few" bots in your house...it would be cool if one day you could do a "group bot shot ):)
kinda hard first to do a group shot,i have about 70 robots,second DJ said no unless its EZB related
BUT when i have time can look at website with all my bots