Re: Relay to operate soliniod or other idea?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, JanRwl@A... wrote:

> Shelby: What kind of CURRENT do these solenoids draw? Less than

500 mA?

>
> The most economical, and VERY good solution, if you "do

electronics", is the

> ULN-2003 Seven-Darlington DIP. That has SEVEN separate NPN

Darlingtons AND

> "spark suppression" diodes, and the input is "TTL level". It is

also available

> as the ULN-2004, for "CMOS inputs" (higher input voltage for

proper

> saturation).
>
> I have operated several machines in which I use Clippard EVO-n
> solenoid-valves (which are available in several voltage-

configurations, but all the same

> size), and I "switch" those soldenoids with the ULN-2003's. They

are 100%

> reliable and cheap (what, a $buck each?). Made by several firms;

originally

> Sprague, and now TI, among others. I have NEVER had a failure in

many machine-years!

>
> Jan Rowland

Thanks Jan

Not too sure on the draw of the solinoids as I have not got them
yet....they probably are round 500 mA or less, they will be the
FESTO brand as our company deals with them.
Can you elaborate on the wiring setup? would you use an IO port to
send signal to solinoid directly or a relay then to solinoid.

Thanks
Shelby

>
>
> [Non-text portions of this message have been removed]