✦Step 1:-Prepare a BT136 triode. Its three pins are T1 T2 G.
✦Step 2:-Solder the 220K resistor to the pinT2.
✦Step 3:-Solder DB3 to the pin G.
✦Step 4:-Solder the 220K resistor together to DB3.
✦Step 5:-Solder the LDR photoresistors to the pin T1 and G respectively.
✦Step 6:-Solder the wire connecting the positive pole of the power supply to the T2 pin.
✦Step 7:-Solder a wire on the T1 pin and then connect it to the positive pole of the bulb.
Video on youtube: