➢Step descriptions:

✦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.

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