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<Qucs Schematic 0.0.19>
<Properties>
<View=-103,-100,1487,868,1,15,0>
<Grid=10,10,1>
<DataSet=af_5vpp_to_adc.dat>
<DataDisplay=af_5vpp_to_adc.dpl>
<OpenDisplay=1>
<Script=af_5vpp_to_adc.m>
<RunScript=0>
<showFrame=0>
<FrameText0=Title>
<FrameText1=Drawn By:>
<FrameText2=Date:>
<FrameText3=Revision:>
</Properties>
<Symbol>
</Symbol>
<Components>
<GND * 1 30 190 0 0 0 0>
<VProbe IN 1 20 170 28 -31 0 0>
<C C1 1 160 240 -26 17 0 0 "1 uF" 1 "" 0 "neutral" 0>
<Vac Vsrc 1 10 300 18 -26 0 1 "2.5 V" 1 "1750 Hz" 0 "0" 0 "0" 0>
<.TR TR1 1 710 520 0 73 0 0 "lin" 1 "0" 1 "0.002 s" 1 "101" 0 "Trapezoidal" 0 "2" 0 "1 ns" 0 "1e-16" 0 "300" 0 "0.001" 0 "1 pA" 0 "1 uV" 0 "26.85" 0 "1e-3" 0 "1e-6" 0 "1" 0 "CroutLU" 0 "no" 0 "yes" 0 "0" 0>
<GND * 1 680 400 0 0 0 0>
<VProbe OUT 1 890 200 28 -31 0 0>
<Lib OP1 1 620 220 25 20 0 0 "OpAmps" 0 "uA741" 0>
<GND * 1 580 150 0 0 0 0>
<Vdc V2 1 970 80 18 -26 0 1 "12 V" 1>
<R R8 1 830 310 -132 -26 0 3 "3.3 kOhm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
<R R7 1 750 220 -26 -65 0 2 "4.7 kOhm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
<R R6 1 330 240 -26 -65 0 2 "4.7 kOhm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
<R R5 1 520 320 -26 -65 0 2 "4.7 kOhm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
<Lib D1 1 580 120 -42 -1 0 3 "Z-Diodes" 0 "1N749" 0>
<R R10 1 580 50 -138 -26 0 3 "2.2 kOhm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "european" 0>
</Components>
<Wires>
<10 190 10 240 "" 0 0 0 "">
<10 240 10 270 "" 0 0 0 "">
<10 240 130 240 "" 0 0 0 "">
<10 330 10 390 "" 0 0 0 "">
<680 390 680 400 "" 0 0 0 "">
<10 390 630 390 "" 0 0 0 "">
<630 390 680 390 "" 0 0 0 "">
<630 260 630 390 "" 0 0 0 "">
<680 390 830 390 "" 0 0 0 "">
<830 340 830 390 "" 0 0 0 "">
<830 220 830 280 "" 0 0 0 "">
<830 390 900 390 "" 0 0 0 "">
<900 220 900 390 "" 0 0 0 "">
<830 220 880 220 "" 0 0 0 "">
<190 240 300 240 "" 0 0 0 "">
<360 240 470 240 "" 0 0 0 "">
<470 320 490 320 "" 0 0 0 "">
<470 240 470 320 "" 0 0 0 "">
<780 220 830 220 "" 0 0 0 "">
<680 220 720 220 "" 0 0 0 "">
<680 220 680 320 "" 0 0 0 "">
<550 320 680 320 "" 0 0 0 "">
<470 240 580 240 "" 0 0 0 "">
<900 390 970 390 "" 0 0 0 "">
<970 110 970 390 "" 0 0 0 "">
<970 20 970 50 "" 0 0 0 "">
<580 80 580 90 "" 0 0 0 "">
<580 20 630 20 "" 0 0 0 "">
<630 20 970 20 "" 0 0 0 "">
<630 20 630 180 "" 0 0 0 "">
<530 200 580 200 "" 0 0 0 "">
<530 90 530 200 "" 0 0 0 "">
<530 90 580 90 "" 0 0 0 "">
</Wires>
<Diagrams>
<Rect 70 755 590 310 3 #c0c0c0 1 00 1 0 0.0002 0.004 1 -3.19938 0.5 3.69314 1 -1 0.2 1 315 0 225 "" "" "">
<"IN.Vt" #0000ff 0 3 0 0 0>
<"OUT.Vt" #ff0000 0 3 0 0 0>
</Rect>
</Diagrams>
<Paintings>
<Text 10 -40 16 #000000 0 "This is a simulation for the audio\nfrequency input to the STM32 ADC.\nIt receives a 5Vpp signal, must be\nAC coupled, and the ADC wants a\n0 to 3V signal.">
<Text 450 110 12 #000000 0 "1N749A\n(4.3V)">
<Text 640 170 12 #000000 0 "LM324">
</Paintings>
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