Try this one with PNP transistors...it does work. 1k instead of the pot gives about 1 ma Picture isn't as nice.
Ode At 11:51 AM 6/25/2004 -0400, you wrote: >I see no way that would limit current. That is the workings of an SCR, which is >an on/off device. I have used an identical circuit many times (in fact I have >a patent on using such a configuration as a PUT) in place of a low voltage scr >or put. > >Marshall > >Dave Lewis wrote: > >> Hi all, >> A colleague of mine has come up with this useful circuit. It limits to >> current to just under 1ma, but if you change the value of R1, you should be >> able to set the current to what you like (within reason!). Don't get too >> hung up if you can't find the correct transistors, just make sure they are >> bipolar and PNP and NPN as per the diagram. >> >> Dave. >> >> ------------------------------------------------------------------------ >> Name: I limit.gif >> I limit.gif Type: GIF Image (image/gif) >> Encoding: base64 > > >-- >The Silver List is a moderated forum for discussing Colloidal Silver. > >Instructions for unsubscribing are posted at: http://silverlist.org > >To post, address your message to: [email protected] >Silver List archive: http://escribe.com/health/thesilverlist/index.html > >Address Off-Topic messages to: [email protected] >OT Archive: http://escribe.com/health/silverofftopiclist/index.html > >List maintainer: Mike Devour <[email protected]> > >
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