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	<p><font size="+2" color="white"><b>DIY Adjustable Oxygen Sensor Simulator</b></font></p>
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			<td align="CENTER"><img id="Picture33" height=170 width=320 src="[url]http://www.sixthsphere.com/o2sim/o2sim.jpg"[/url] border=0></td>
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	<p><font color="white">The oxygen sensor simulator as built on a protoboard. Note the cigarette lighter plug used for power source. The adjustment knob is at the left, and the switch is on the right. The red indicator LED is in the middle. Only use red, because the voltage drop of the LED is part of the circuit!</font></p>
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	<p><font color="white"><img id="Picture34" height=288 width=600 src="[url]http://www.sixthsphere.com/o2sim/o2simsch.gif"[/url] vspace=0 hspace=0 align="TOP" border=0></font></p>
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	<p><font color="white">The schematic diagram for the simulator. Closing the switch engages the simulator. Turning the knob clockwise simulates a lean condition, turns the LED off, and the car should start running rich to compensate. The big &quot;V&quot; is a digital voltmeter(not shown in the pictures). Using a smaller value for C1, perhaps 4.7 uF, will make the circuit oscillate faster and might be more like a real oxygen sensor(a new sensor switches more often than an old one).</font></p>
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			<td align="CENTER"><img id="Picture35" height=143 width=320 src="[url]http://www.sixthsphere.com/o2sim/o2cbl.jpg"[/url] border=0></td>
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	<p><font color="white">The adapter cable. Note the connector recycled from an old oxygen sensor. Hard to see under the black tape: 100K resistor.</font></p>
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	<p><font color="white"><img id="Picture36" height=271 width=600 src="[url]http://www.sixthsphere.com/o2sim/o2cblsch.gif"[/url] vspace=0 hspace=0 align="TOP" border=0></font></p>
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	<p><font color="white">The schematic diagram of the adapter cable and oxygen sensor. Note the heater is shown as a resistor, mine measured about 7 ohms.</font></p>
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