driving a relay with 24vdc low current IO

Feb 14, 2007 8 Replies

I have a board with a bunch of TTL-level IO. It can handle a few milliamps (about 10) per IO.



I would like to be able to control 120VAC loads with this board. The relay bank I have needs 50 ma to drive each relay; too much for my little board.



Does anyone know of a ready-made inexpensive relay that can switch 10A @



120 VAC and uses < 10ma to do so?

On a related note, does anyone know of a ready-made solution for connecting a typical ribbon cable to a screw-down termblock? I have a



16x2 0.1" header and I would like to take that to a screwdown termblock.

Thanks,


--Yan


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solid-state relays, or add some transistors to boost the power of your outputs.

strip the ends ans screw them down?

Bye. Jasen

you could use a reed relay direct off your ttl circuit to drive a bigger relay through the contacts on the reed relay

:-)

I was hoping for a more professional looking solution....

I have a header on the inside of a box, and want to take it out. This is in a production environment, so paying someone to split, strip, and screw (that sounds pretty good, actually - all depends on what they look like) down 36 fine wires would pay for a ready-made connector, with fewer problems.

--Yan

Google "IDC Connector" - I got 149,000 hits even _with_ the quotes!

With those, you can continue to use the header, assuming you're talking about one of these:

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Good Luck! Rich

you want this connector to interface with the screw end of your termblock?

which sort of termblock is it? what sort of ribbon cable are you using?

maybe you could terminate to a PCB using a solder-in idc termination and the pcb also have a soldered in straight or right-angle pin-header that matches your terminal block.

Bye. Jasen

if you can avoid using the screwblock do so, why noy use a DIL pin header, they make ones with locking clips

Bye. Jasen

Actually, I am looking to *buy* an IDC-to-termblock cable. Something with a DIL IDC female on one end, and a screw-down on the other end, so we don't have to fabricate it. I guess I was expecting that to be fairly common, but since I can't find one, maybe no one else needs one. :-(

Why a screw-down? Because our market expects it. Our customers want screw downs. (Yeah, I'd rather have modular connectors, but they would be a hard sell.)

--Yan

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