Yes, an opamp is a good choice to provide gain. You will also need a comparator to set a reference above which you will light the LED and below which you will extinguish the LED.how about an op-amp?
As the stabilizer for the voltage reference, you can change the zener diode as long as the zener value is nominated below the lowest possible supply voltage, just change the R1 value to give the appropriate voltage on lowest supply voltage condition, and add a resistor in series with the pot so you keep the original adjustment range of 0-2.6V.Thanks for the help.
In Eplanet's Circuit there is a 2.6v zener diode. What is it for can i leave it out? I dont have one for 2.6 can I use a 5.1 or a 5.6?
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