DIY-WB LED problem

[Phil Hunter]

Looking briefly at the schematic, here's my suggestion: remove
IC1 from it's socket, nothing to the sensor input, on IC2a short
pins 1 & 2, this will make it a unity gain buffer where pin 1
follows the voltage on pin 3. Vary VR3 from end to end, pin 1 should
vary from about 1/4 to 1/9 of 2.5V. Remove the short and jumper pin 1
to the sensor input, this will turn it into a 3X amplifier, now
varying VR3 should have pin 1 varying from 3/4 to 3/9 of 2.5V. This
should give you confidence that all the input circuitry (with the
exception of VR2, the 3.3K & the 560K ) is correct.

HTH,
philh


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