<Qucs Schematic 0.0.24>
<Properties>
  <View=0,0,1141,800,1,0,0>
  <Grid=10,10,1>
  <DataSet=notch.dat>
  <DataDisplay=notch.dpl>
  <OpenDisplay=0>
  <Script=notch.m>
  <RunScript=0>
  <showFrame=0>
  <FrameText0=Title>
  <FrameText1=Drawn By:>
  <FrameText2=Date:>
  <FrameText3=Revision:>
</Properties>
<Symbol>
</Symbol>
<Components>
  <R R5 1 310 120 -25 -54 0 0 "10k" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
  <R R3 1 390 200 -21 -52 0 0 "1k" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
  <R R2 1 300 260 -20 -57 0 0 "1k" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
  <OpAmp OP1 1 210 260 6 22 0 0 "1e6" 0 "15 V" 0>
  <OpAmp OP2 1 380 280 13 20 0 0 "1e6" 0 "15 V" 0>
  <.DC DC1 1 30 460 0 40 0 0 "26.85" 0 "0.001" 0 "1 pA" 0 "1 uV" 0 "no" 0 "150" 0 "no" 0 "none" 0 "CroutLU" 0>
  <C C2 1 540 210 17 -26 0 1 "1u" 1 "" 0 "neutral" 0>
  <C C1 1 210 200 -30 -59 0 0 "1.01u" 1 "" 0 "neutral" 0>
  <Eqn Eqn1 1 230 470 -23 12 0 0 "Gain=dB(Out.v/In.v)" 1 "yes" 0>
  <R R4 1 480 280 -21 -52 0 2 "1k" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
  <R R1 1 140 310 -63 -22 1 1 "10k" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
  <GND * 1 140 360 0 0 0 0>
  <Vac V1 1 100 170 -45 -17 0 1 "1uV" 0 "1 GHz" 0 "0" 0 "0" 0>
  <GND * 1 100 220 0 0 0 0>
  <.AC AC1 1 30 540 0 40 0 0 "lin" 1 "1" 1 "1000" 1 "501" 1 "no" 0>
</Components>
<Wires>
  <420 280 430 280 "" 0 0 0 "">
  <420 200 430 200 "" 0 0 0 "">
  <430 200 430 280 "" 0 0 0 "">
  <330 260 340 260 "" 0 0 0 "">
  <250 260 260 260 "" 0 0 0 "">
  <260 260 270 260 "" 0 0 0 "">
  <340 260 350 260 "" 0 0 0 "">
  <340 200 340 260 "" 0 0 0 "">
  <340 200 360 200 "" 0 0 0 "">
  <340 300 350 300 "" 0 0 0 "">
  <340 300 340 340 "" 0 0 0 "">
  <340 340 540 340 "" 0 0 0 "">
  <540 280 540 340 "" 0 0 0 "">
  <540 240 540 280 "" 0 0 0 "">
  <170 340 340 340 "" 0 0 0 "">
  <170 280 180 280 "" 0 0 0 "">
  <170 280 170 340 "" 0 0 0 "">
  <140 240 180 240 "" 0 0 0 "">
  <260 200 260 260 "" 0 0 0 "">
  <240 200 260 200 "" 0 0 0 "">
  <140 200 140 240 "" 0 0 0 "">
  <140 200 180 200 "" 0 0 0 "">
  <340 120 540 120 "Out" 550 90 195 "">
  <540 120 540 180 "" 0 0 0 "">
  <430 280 450 280 "" 0 0 0 "">
  <510 280 540 280 "" 0 0 0 "">
  <140 240 140 280 "" 0 0 0 "">
  <140 340 140 360 "" 0 0 0 "">
  <100 120 280 120 "In" 70 90 0 "">
  <100 120 100 140 "" 0 0 0 "">
  <100 200 100 220 "" 0 0 0 "">
</Wires>
<Diagrams>
  <Rect 730 395 364 275 3 #c0c0c0 1 10 1 3 1 1000 1 -65.8604 20 5.53277 1 -1 0.5 1 315 0 225 "" "" "">
	<"ngspice/ac.gain" #ff0000 2 3 0 0 0>
  </Rect>
</Diagrams>
<Paintings>
  <Text 420 430 12 #000000 0 "50Hz notch filter:\nbuilt by use of extremly high Q gyrator,\nOpAmps fake a 10.1Henry+0.5mOhm coil\nthat forms resonance circuit with C2">
  <Text 420 520 12 #000000 0 "OpAmp gyrator fakes:\ninductance = C1*R1*R2*R4/R3\nresistance = 0.5*R2*R4/R3/OpAmpGain">
</Paintings>