% Timer.m4
ifelse(ifmpost(T)`'ifpostscript(T),,`{\small\sf')
.PS
cct_init

define(`ic555',`[Chip: box ht boxwid wid boxwid "555"
  P7: "7" ljust at 1/6<Chip.sw,Chip.nw>
  P6: "6" ljust at 1/2<Chip.sw,Chip.nw>
  P2: "2" ljust at 5/6<Chip.sw,Chip.nw>
  P4: "4" below at 1/3<Chip.nw,Chip.ne>
  P8: "8" below at 2/3<Chip.nw,Chip.ne>
  P3: "3" rjust at Chip.e
  P1: "1" above at Chip.s
  ]')

  define(`elen_',`linewid')
Vs: dot
  down_
  variable(`resistor(,E)'); llabel(,1`\,'\hbox{M})
  resistor(,E); llabel(,100`\,'\hbox{k})
  capacitor(,E); llabel(220`\,'\mu)
Zero: dot

  dot(at Vs+(elen_*4/3,0))
  resistor(,E); llabel(,33`\,'\hbox{k})
  line to (Here,Zero) chop 0 chop elen_
C2: capacitor; llabel(0.1`\,'\mu)
  dot

IC1: ic555 with .P7 at C2.start + (elen_,0)
  line from IC1.P4 to (IC1.P4,Vs); dot
  line from IC1.P8 to (IC1.P8,Vs); dot
  line from IC1.P1 to (IC1.P1,Zero); dot
  line from IC1.P2 to (C2,IC1.P2); dot
  crossover(from IC1.P7 to (Zero,IC1.P7),R,C2); dot
  line from IC1.P6 left elen_/2 then down IC1.P6.y-IC1.P7.y; dot
  line from IC1.P3 right elen_*2/3
R: dot
  line right_ elen_/3
B: buzzer(,,C) with .In3 at Here
  line from B.In1 to (R,B.In1)
  reversed(`diode',to (Here,Vs),LE); "red" at last line.c+(elen_/2,0)
  resistor(down_ elen_ from R,E); llabel(,470)
  diode(to (Here,Zero),LE); {"green" at last line.c+(elen_*2/3,0)}
  line to Zero chop 0 chop -elen_
  line up_ (Vs.y-Here.y)/3
  battery(up_ (Vs.y-Here.y)/3); rlabel(,,9`\,'\hbox{V})
  switch(to (Here,Vs),,D)
  line to (R,Vs)

.PE
ifelse(ifmpost(T)`'ifpostscript(T),,`}%')