I have posted something about this and mentioning a VCO. But the response for the VCO is opposite to what I want. As the LDR (light dependent resistor) is in the dark, the resistance goes up. So with an OP-AMP and feedback, I can get what I want. But I am stuck on how to use the OP-AMP to drive t…

LCD back lighting.

terryking228 May 25, 2012, 10:12am 2

Hi,
How many LEDS? How much power (LED Voltage and current)?? This will affect possible circuits..

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