On Sat, 05 Sep 2009 13:22:37 -0500, John Fields
wrote:

On Sat, 05 Sep 2009 11:03:51 -0700, life imitates life
wrote:

On Sat, 05 Sep 2009 12:48:41 -0500, John Fields
wrote:

On Sat, 05 Sep 2009 09:41:06 -0700, Jim Thompson
wrote:

I haven't done a relay driver circuit for, literally, eons.

Where do I look for reed relays that work on 3.3V supplies with
specications for the coil inductance?

Thanks!

---
That's a toughie.

I can't recall ever seeing inductance data on a spec sheet; I think
you'll probably have to go to the manufacturer for that one.

JF

Would not the real question be why would someone concern himself with the
solenoid inductance of a miniature relay? I could see it if it were
huge.

---

L di
E= ------,
dt

so the diode damping the "spark" when the driver went open would slow
down the opening of the contacts, maybe?

Or maybe the magnetic field building up and breaking down might affect
some nearby component?

Dunno...

JF

3.3 V relay that requires a can over it due to the field it makes?

I suppose it is possible. I doubt much field is generated though.

The collapsing field gets pumped into the diode. One could design the
firing circuit to "slow stop" as well. reducing any collapsing flux to
minimal since it is created as a result of the slew rate at which it was
collapsed.