I have a load that has varying resistance with external pressure. In order to measure the change, I am trying to measure the voltage on the load, when constant current is applied. And the circuit in the attachment is known to supply constant current using a transistor and a zener diode. But I have no idea what resistor/ transistor/ diode I need. I do not know if the circuit will burn them out.
The current on the load has to be approximately 6 mA, I think. And the supply voltage might be 5V or 3.3V. If impossible, the supply voltage can be changed. If needed, the transistor and zener diode I purchased are KTC3198, and 1N5231B-5.1V, respectively. The minimum current zener diode needs is 0.25 mA. Please comment, if any further information needed
The current on the load has to be approximately 6 mA, I think. And the supply voltage might be 5V or 3.3V. If impossible, the supply voltage can be changed. If needed, the transistor and zener diode I purchased are KTC3198, and 1N5231B-5.1V, respectively. The minimum current zener diode needs is 0.25 mA. Please comment, if any further information needed
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