Greenwatts

CDS-PCB

Because of the small size of the board the image below has been increased in size for clarity. The image should be resized so that each side of the board is 36mm x 36mm as measured from the grid marks (dimension does not include grid marks)

We may soon have these boards available for purchase at a nominal price. The top left M- on the component side is the negative connection for the DC motor and the M+ between the two transistors (T1, T2) is positive connection for the DC motor. The lines are jumpers. The CDS cells (CDS1 and CDS2) are not mounted on the PCB but connected with leads. All of the required parts should be obtainable from recycled scrap electronics.

PARTS LIST:

• GL358 - dual op amp or any similar with same pin-out
• T1 - PNP transistor
• T2 - NPN transistor
• LED - use a white 3.5v LED (garden light)
• R1 - 1K ohm 1/4 watt resistor
• R2 - 3K ohm 1/4 watt resistor
• R3 - 1K ohm 1/4 watt resistor
• P1 - 50K ohm trimmer pot
• P2 - 10K ohm trimmer pot