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DIY Automatic Night Lamp

Author:Utsource Date: 07/08/2019 SHARE

『 2N2222 』     view more: https://www.utsource.net/sch/2N2222
『 BC558』        view more: https://www.utsource.net/sch/BC558
『 220K Resistor』     view more: https://www.utsource.net/sch/220K%20Resistor
『 5V Relay』             view more:   https://www.utsource.net/sch/5V%20Relay
『1N4001 Diode』     view more: https://www.utsource.net/sch/1N4001%20Diode
DIY Automatic Night Lamp

Step descriptions:
Step 1:-Connect everything according to following schematic.
Step 2:-Add NPN 2N2222 transistor to breadboard
Step 3:-Add a 250K resistor from the base of 2N2222 to the positive rail.
Step 4:-Connect LDR (Light dependent resistor) from base of 2N2222 to negative rail.
Step 5:-Add BC558 with its collector on Positive rail
Step 6:-Connect base of BC558 to emitter of 2N2222
If you’re connecting an inductive load, like a relay or a motor, you must connect a diode in reverse bias configration to protect the transistor from back EMF but, if you are just using LED, diode isn’t needed.
Step 7:-Connect the load
Step 8:-Connect power 5V
Step 9:-Add LED instead of relay.

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