RE: [AVR-Chat] OPTOCOUPLER
2005-08-05 by Sousa, Nick
The base pin does not 'have' to be connected if there were another source to turn on the optocoupler that did not need to be isolated could use the base drive.
Show quoted textHide quoted text
-----Original Message----- From: Mansur Mansur [mailto:heavenly_arnold@yahoo.com.sg] Sent: Friday, August 05, 2005 3:09 AM To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] OPTOCOUPLER Robert, 250mA, 12Vdc is enough to drive the contactor, I use 220KOhm Resistor for the pull up. Please check the attachment i have sent previously, the internal phototransistor has base pin which i have no idea where to connect to..please comment Mansur Robert Adsett <subscriptions@aeolusdevelopment.com> wrote: At 09:23 PM 8/3/05 +0200, Ralph Hilton wrote: >On Wed, 03 Aug 2005 11:10:23 -0400 you wrote: > > >At 02:08 PM 8/3/05 +0200, Ralph Hilton wrote: > >>On Wed, 3 Aug 2005 12:31:14 +0800 (CST) you wrote: > >> > >> > > >> >Dear All, > >> > > >> > > >> >Thanks > >> > > >> >Mansur > >> > >>How much current does the "contactor" need? > > > >Indeed, the devices I refer to as contactors usually draw from 800ma to > >over 3A to pull in the tips. Well over the rating of most optocouplers. A > >simple reed relay on the other hand... > >ok, it is good when you want a meaningful answer to give as much data as >possible. > >How about using a logic level MOSFET? Ralph, I think you've confused me with the original poster :) Robert " 'Freedom' has no meaning of itself. There are always restrictions, be they legal, genetic, or physical. If you don't believe me, try to chew a radio signal. " -- Kelvin Throop, III http://www.aeolusdevelopment.com/ Send instant messages to your online friends http://asia.messenger.yahoo.com _____ YAHOO! GROUPS LINKS * Visit your group "AVR-Chat <http://groups.yahoo.com/group/AVR-Chat> " on the web. * To unsubscribe from this group, send an email to: AVR-Chat-unsubscribe@yahoogroups.com <mailto:AVR-Chat-unsubscribe@yahoogroups.com?subject=Unsubscribe> * Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> . _____