All, White LEDs are especially good indicators at low currents. I have built LED flashlights that are always "idling" at about 30 microamps (0.03 milliamps) so that they are clearly visible in a darkened room and can be found easily. A white LED should be quite noticible at 0.2 ma. --Steve Y. ----- Original Message ----- From: "Dave Lewis" <[email protected]> To: <[email protected]> Sent: Friday, June 25, 2004 9:22 AM Subject: RE: CS> Useful current limit circuit
> Hi Wayne, > > >> 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!). > > >Nice circuit, nice drawing. > > Thanks. Electronics is what we do for a living. > > >One question. > > > >Have you checked the brilliance of the LED at that low current? Likely > >some of the smaller ones will work fine. > > Most LED's will light dimly at this current. When I did my tests on the > de-ionised water at 0.2ma, you could see the led lit very dimly. It was > quite a bit brighter when the test stopped at 0.8ma -- 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]>
