Conver TTL into Relay

[K C]

Hi Sandesh,
A simple relay driver.
<img src="Loading Image..."> Message Edited by K C on 10-26-2007 08:55 AM


Rel driver.jpg:
http://forums.ni.com/attachments/ni/70/7659/1/Rel driver.jpg

[K C]

I am sure that these devices are on the market, but you have to look for yourself.
The transistor is a standard NPN. a 2N2222A will do.

[K C]

Something like a ULN2001.... you should use a ULN2003 for your circuit.
Here it is for 1 relay.
<img src="Loading Image..."> Message Edited by K C on 10-26-2007 04:23 PM


Rel driver 2.jpg:
http://forums.ni.com/attachments/ni/70/7667/1/Rel driver 2.jpg

[K C]

Try ULN2803A
&nbsp;Message Edited by K C on 10-29-2007 09:26 AM

[K C]

The ULN2803 already has diodes for protection.
The only thing the originator needs to drive is a 5V relay, so no high voltage

[Dennis Knutson]

Warp,
This board is for discussions of the NI digital I/O devices. You would be better off posting to the <a href="http://forums.ni.com/ni/board?board.id=370" target="_blank">Multisim board</a>.

[K C]

Choosing relays is not as simple as one might think.
depends on: switch voltage, switch current, nominal voltage, nominal current, AC and/or DC, temperature, reaction time, number of contacts, electrical lifetime, mechanical lifetime, coil voltage, and so on.....

[K C]

Try a search at Farnell
With a quick look I found G2R-1A-E-DC12 from Omron. See <a href="http://nl.farnell.com/jsp/search/browse.jsp;jsessionid=ZLV244S55F5T1QFIAEXZKBQ?N=500010+1001522+127263+127264+111723+111724+111725+111726+111727&amp;Ntk=gensearch_001&amp;Ntt=relay&amp;Ntx=&amp;_requestid=119989" target="_blank">this </a>for a complete list of 12VDC &nbsp;SPST relays

[Elizabeth L]

It looks like you haven't had much luck getting a reply on your message.&nbsp; Unfortunately I can't answer your question but I do have a couple of tips for you:

- I would suggest starting a new thread for new questions.&nbsp; New, unanswered posts will get more new traffic than an extra post on an existing thread.

- The expertise of most of the users in these forums is more in the area of NI products.&nbsp; If you haven't already done so, you may have&nbsp;better luck getting an answer to this question from an electronic component distributor.

Good luck with your application and sorry that I can't help you more!

[Elizabeth L]

It looks like you haven't had much luck getting a reply on your message.&nbsp; Unfortunately I can't answer your question but I do have a couple of tips for you:

- I would suggest starting a new thread for new questions.&nbsp; New, unanswered posts will get more new traffic than an extra post on an existing thread.

- The expertise of most of the users in these forums is more in the area of NI products.&nbsp; If you haven't already done so, you may have&nbsp;better luck getting an answer to this question from an electronic component distributor.

Good luck with your application and sorry that I can't help you more!