Inverse Voltage Control
This circuit creates a voltage inversely proportional to a variable resistance.
The PNP transistor is turned on to saturation. So the voltage through the collector is:
IR1= (VP-VBE)/(R1+R2)
VControl= R3(VP-VBE)/(R1+R2)
This circuit creates a voltage inversely proportional to a variable resistance.
The PNP transistor is turned on to saturation. So the voltage through the collector is:
IR1= (VP-VBE)/(R1+R2)
VControl= R3(VP-VBE)/(R1+R2)
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