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Schematic
P1--- 500k OHM Trimmer
R1---470 OHM
Q1---BC547,BC337,9013 or other NPN
PT-Phototransistor
B1---2,5 to 9volts
LED-Red 5mm or other.
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Schematic
P1--- 500k OHM Trimmer
R1---470 OHM
Q1---BC547,BC337,9013 or other NPN
PT-Phototransistor
B1---2,5 to 9volts
LED-Red 5mm or other.