O2 sensor Tester

Calculations:

R5
V=12V-9V=3V
I=5.6mA

V=IR
R=V/R
R5=3/0.0056=535.7 Ohms

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Vtotal = 9V
V(R7)=0.23V
V(R8)=0.63V-0.23V=0.4V
V(R6)=9V - 0.63V = 8.37V
R6= 10 000 Ohms

I=V/R
I = 8.37/10 000 = 0.000837A =0.837mA

R8 = 0.4/0.000837= 477.9 Ohms
R7 = 0.23/0.000837 = 274.8 Ohms

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R = (Vs-Vled)/Iled

R2 = (12-1.8)/0.0095= 1073.7 Ohms
R3/4 = (12-1.8-0.7)/0.0095 = 1000


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Part list:

3 x Diodes 1N4001
3 x Resistors 1K
1 x Zener Diode 9V1
1 x 3mm Green LED
1 x 3mm Yellow LED
1 x 3mm Red LED
2 x Capacitors 0.1uF
1 x Resistor 10K
1 x Resistor 270R
1 x Resistor 470R
1 x Resistor 540R
1 x IC LM324AM


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Lochmaster Diagram:


top side:

Bottom Side:

Video: