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s hardware <dg8fz @ww $90c261dg8fz #0 Solder-Pen with 555 +-------------------------------------------+ +-----(---*-----------*----*---------------*---*--(--<- + 12 V ! ! ! ! ! ! ! ! R4 ! ! ! ! !< ! ! ! ! ! --4----8-- +--4k7--! R3 ! *---+ ! !\7 +-R1-*-6 ! ! !\ ! ! ! ! +-2 \ ! ! ! 7---+ ! ! ! R ! ! 6-* ! ! 555 ! +------*-*-*--+ Solder-Pen (Rx) <-2-o-*---3 / ! ! ! 3--+ ! ! 12V 8W ! !/4 +-AK-*-2 ! ! ! +-------=========_________ ! ! ! -----1---- LED LED +-------========= ! / ! C ! ! ! ! R5 741 ! 1 ! +-*-+ ! ! ! ! ! 1K ! +---------*-------*------*--------*----------*--------- gnd Rx (hot) = 13.8 Ohm Rx (cold)= 11.6 Ohm AK = 1N4148 R3 = 47 Ohm ( 5 Watt ) R4 = R3 *n n = R2 / ( Rx(hot) -Rx(cold) ) R5 = Rx(cold)*n zykle t>0.693* R1 * C1 abt. 1/4 sec 73 de karl (c) dg8fz @ db0sao.deu.eu 26.Dez.90 ***end

 

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