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Simple Twilight Switch

for Retrofitting Lamps or Installations

Simple Twilight Switch
Simple Twilight Switch
A twilight switch is a useful device that turns a lamp on at dusk and off at dawn. Some lamps have this included, but, if not, you can build your own twilight switch!  

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Materials

Component list

Component List

Resistors

(SMD 1206 if not otherwise noted)

R1, R2 = 4k7

R3 = 22 k

R4, R8 = 10 k

R5 = 47 k Trimpot

R6 = Varistor 10D391K

R7 = 390 k

R9, R10 = 1k2

R11= LDR

 

Capacitors

(SMD 1206 if not otherwise noted)

C1 = 68 n

C2 = 100 n

C3 = 100 µ / 16 V, electrolytic, ø 5 mm

 

Semiconductors

D1 = 1N4007, DO-213AB

LED1 = LED, red, 3 mm 

LED2 = LED, green, 3 mm 

T1 = BC547, SOT23

IC1 = LM741, SOP8

 

Miscellaneous

RE1 = Relay 12V / 10 A, type 40.515

X1 = 8 poles screw terminal, 2/10″

F1 = Fuse 500 mA 

PSU = PCB power supply 12 V / 3 W, HLK-PM12

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