Customer asked:

The resistance of R7, from 10K to 30K, to 100K,

In the office light (100lux) will light up,

Whether our circuit design is unreasonable,

As soon as the power is on, when there's enough light in the office environment,

It's cut-off. There's no current...

When I covered it with my hand, it started to glow...

When I let go, it kept glowing,

It will never enter the cutoff state again.

Can Tech take a look at it?

A:

Adjust these two resistance values,

The start value can be adjusted to r7, but the close value r7 and r4 must be adjusted to each other.