driving a relay with 24vdc low current IO

[CptDondo]

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

 

[JeffM]

I have a board with a bunch of TTL-level IO.
Does anyone know of a ready-made inexpensive relay
that can switch 10A @ 120 VAC and uses < 10ma to do so?

http://en.wikipedia.org/wiki/Solid_state_relay
http://www.google.com/search?num=100&q=solid-state-relay
http://froogle.google.com/froogle?scoring=p&price=between&price1=1&q=intitle:solid-state-relay

 

[jasen]

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?

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

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

strip the ends ans screw them down?

Bye.
Jasen

 

[[email protected]]

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

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

 

[CptDondo]

strip the ends ans screw them down?

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

 

[Rich Grise]

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.

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:
http://www.king-cart.com/phoenixent/product=HEADERS+BREAKAWAY+.1SP+STR/exact_match=exact

Good Luck!
Rich

 

[jasen]

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.

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

 

[jasen]

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.

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

 

[CptDondo]

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

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