On Thu, 5 Feb 1998, Robert McAtee wrote: > Gee that's a hard way to get a led to work off of 1.5 volts. I've got leds > blinking for over a year using LM3909's a 100uf cap. amd a 1.5 volt C cell. > Then again maybe you want a steady light??? ==Mac== PTM: I didn't have a LM3909 in an easy reach. I wanted to have as much steady light out of a HiBright Led as possible. This uses about all the juice in a cell: this morning, after 9 days of light there was 0.599 V in the cell and still the LED was rather bright. 0.599 is very near what we normally need between base and emitter of a trasistor, so now it goes interesting... > ============================================================================ > === > >On 2/2/98 Pasi T Mustalahti wrote: > > > >-------8<-------- > >> > >> ------------------------------------- +U (0.6..1.55 V) > >> | | > >> R20K || < > >> | || < > >> ----------------> || < > >> | > || < > >> = 10nF | /------>|--| > >> | ----| BC337 | > >> | \ | > >> | | | > >> -------------------------------------- > >> -------------------------------------------------------------------------- PTM, pasi.mustalahti@utu.fi, ptmusta@utu.fi, http://www.utu.fi/~ptmusta Lab.ins. (mikrotuki) ATK-keskus/Mat.Luon.Tdk OH1HEK Lab.engineer (PC support) Computer Center OI7234 Mail: Turun Yliopisto / Fysla, Vesilinnantie 5, 20014 Pt 02-3336669, FAX 02-3335632 (Pk 02-2387010, NMT 049-555577) --------------------------------------------------------------------------