Not to be a "doomsayer", but there WILL be noise, that's why I suggested suppression diodes (4) on the motor, like this:
Yes.
BTW the diodes for the motor circuit are there to stop the relay contact welding together as well as prevent massive amounts of noise.
wouldnt the diodes be drawing current during idle in that circuit?
possibly a very, very low leakage current, but this should be less than the self-discharge of the battery.
No, they are off except when inductive kick-back happens.
Four diodes most conveniently assembled as a bridge rectifier module.
Exactly. And diodes have a leakage current, albeit a small one, in the reverse direction. I don't think manufacturers write this value in the data sheets just for fun.
component list? Sketch?.......anyone?
Well if you all bail on me, Thanks for educating me a lot on this one. Much appreciated to all.
Insignificant except for Schottkys.
There are other exceptions, photo diodes in the light (including LEDs), germanium diodes, probably some exotic microwave diodes too (there are a whole bestiary of these...).
I thought they were only used for making "Crystal Sets"? 
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.