i want to transmit a square pulse through USB port, is it possible?? if not then what is the best way to do that, preferable is with serial then parallel, and its compatibility with vista,XP,and @))7 windows

[Intaris]

Aye, that's a whole lot better than trying to "trick" a communications bus into delivering pulses.

Must bookmark that page too, looks interesting.

Shane.

[Ben]

NI-USB-6525

Ben

[Intaris]

Yes indeed Ben but there's a big price difference there.....

[NIquist]

I think you guys scared the OP off with your attitudes.  Acting in a polite, helpful, understanding and patient manner has no place on the interwebz.

[smercurio_fc]

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NIquist wrote:

I think you guys scared the OP off with your attitudes.  Acting in a polite, helpful, understanding and patient manner has no place on the interwebz.

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Buzz off.

EDIT: For those of you who don't recognize tongue-in-cheek remarks, that was one.

EDIT2: Lots of flurry going back and forth, but still no details on the relays from the OP...

Message Edited by smercurio_fc on 05-04-2010 03:28 PM

[Ray.R]

He's probably busy shopping for the relays  😄 

or laughing at us...

or both

😄

[sanghi]

never intended to write in caps...,,,,

i was in hurry and didnt noticed the caps, and i need you help so i respect all of you.

i want to drive a sound transducer through the relay, i will check the current through the device n will use some current driving circuit to control that, thanks for the warnig that it can destroy the motherbord, now will take care of that.

i never wanted do be harsh.

the pulse length may be of 100 millisecond. 

[Ray.R]

a sound transducer...  Do you mean a microphone?  And a circuit that requires an excitation current?  That usually involves an amplifier circuit, so you might be able to drive a transistor from the parallel port and have an external supply to provide the current source.  As a matter of fact, there might be sufficient current from the parallel port to do so, depending on the specs of the transducer.  So you might be able to do without a relay.

[NIquist]

If you're transmitting a pulse to a sound transducer isn't there any way you could use a sound card to output your signal? You can easily control the frequency and amplitude with LabVIEW. Plus, sound cards are cheap and will run on any platform with ease.

BTW Sanghi, I didn't mean you were being harsh.  I was just commenting on how everyone else was being so helpful.   

Message Edited by NIquist on 05-05-2010 09:43 AM

[Coq_Rouge]

Why do give us only small drip of information. The result is a lotof postings back and forth. And you are still standing at start. So please give us all information you have like. This is what I want to do, and this is how I plan to do it. Do not hold anything back. I can not see why this can be so difficult. But of course if your project is due in say 12 months, we can still do it your way.