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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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