Transistors: Switching a Relay Coil

RE: Transistors: Switching a Relay Coil

D_Hersey — Thu, 09 Feb 2017 18:38:27 GMT

in the case of an H drive

RE: Transistors: Switching a Relay Coil

D_Hersey — Thu, 09 Feb 2017 16:54:10 GMT

1N4148, 12V zener and 47R resistor across coil

What if we make the resistor larger in value?

-regards

RE: Transistors: Switching a Relay Coil

DAB — Tue, 07 Feb 2017 19:50:16 GMT

Very good detailed post.

You have provided me with a lot of review information on transistor and coil theory.

I find it is useful to review things you think you know so that you realize that you have forgotten more than you care to admit.

Anyway, great explanation and testing.

DAB

RE: Transistors: Switching a Relay Coil

mcb1 — Mon, 06 Feb 2017 23:33:19 GMT

Nice work.

The one thing that I've not seen is the diode across the transistor.

Most of the transistors with back emf have this included, so a comaprison would be great.

It may be they add to the release time.

Mark

RE: Transistors: Switching a Relay Coil

jw0752 — Mon, 06 Feb 2017 23:20:41 GMT

Very nice side by side comparison of the different approaches with this experiment. This information will be valuable to all of us who like to interface the electronic and mechanical worlds.

Thanks for the great post.

John