I've inherited a 12V outdoor lighting system with a rather old controller, a Twilight CB-150MD model. The dusk-to-dawn light sensor never seemed to work so I managed to track down the manufacturer in Taiwan and had them send me a replacement. After installing it, by trial and error I found that it only by shining a flashlight directly on to the sensor could I get the system to think that it was daylight. Obviously the sensitivity needs to be adjusted but my electronic knowledge is limited. I'm fairly handy with a soldering iron so if anybody thinks they can give me an idea of what to try, I'm game. I've tried asking the manufacturer for help but have gotten no response.
Attached are two pictures of the circuit board. The light sensor is attached by the two wires, black/white striped at the top (marked CDS) and white. By looking at the bottom of the board, I can see that R1 is directly wired to the white wire. Would it be safe to assume that R1 controls the sensitivity? To raise the sensitivity, would you try raising or lowering the value of R1, and by how much? I don't have one of those gadgets to try plugging in different resistance values.
Attached are two pictures of the circuit board. The light sensor is attached by the two wires, black/white striped at the top (marked CDS) and white. By looking at the bottom of the board, I can see that R1 is directly wired to the white wire. Would it be safe to assume that R1 controls the sensitivity? To raise the sensitivity, would you try raising or lowering the value of R1, and by how much? I don't have one of those gadgets to try plugging in different resistance values.