Re: Opto / relay recommendation

Thanks Eric,

I've got two Opto22 ODC5's, two IDC5's (atlhough I hav'nt yet worked
out the wiring on the IDC5) and two Crydom Solid State Relays which I
bought surplus a while back.
Any disadvantages to the ODC5 other than cost relative to a ULN2003 ?

Regards,

Rab

--- In CAD_CAM_EDM_DRO@y..., Eric Keller <unterhausen@y...> wrote:
>
> I think you want to use a solid state relay of some
> kind. Depending on your access to surplus, these can
> be very cheap. I use the greyhill odc5 modules a lot.
> If you do, the best way to drive it is to turn on the
> relay with a logic low level, as it is not reliable to
> use logic high. Similarly, you want to connect the
> 24v to the solonoid, and use the relay to pull the
> other end of the solonoid low. The alternative may or
> may not work.
>
> You may wish to use a mechanical relay. In this case,
> one of the udn200x series darlington arrays will drive
> the coil low very nicely. You can use the relay to
> interrupt ground or power. Don't forget to bypass the
> coil with a diode.
>
> Either way, it would be good to get relays that will
> withstand 24v on the coil side so you can use the same
> power supply for both ends.
>
> Eric
>
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