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STD Emergency Light Socket Circuit

License: Public Domain

Mode: Editors' pick

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Update time: 2020-02-24 08:32:00
Creation time: 2018-04-02 12:20:40
Description
The appliance operates similarly to the existing socket until it detects the power is removed when it automatically switches to battery operation and illuminates the bright light emitting diodes. The rechargeable battery enables the light emitting diodes to stay on independently for up to a minimum of three hours or until the electrical power returns. A 820nF 250/400 volt AC capacitor is dropping the 230volt AC to low volt AC. X Rated capacitor 0.82uf 400 Volt - X=1/{2xPIx50x0.82x(1/1,000,000)} = 38818.278 Ohms or 38.8 Kilo ohms. 230V/38.8 = 5.92mA Bleeder resistor 270R 2W is used to remove the stored current from the capacitor. BR IN4007 D1 through D4 rectifies the low AC to DC. The capacitor 470uF 16 or 25V makes the DC ripple free. This S9012 PNP transistor in TO-92 package is perfect for switching applications and switches power from the 3.7 volt battery to the light emitting diodes. Zener Diode is commonly used as a voltage regulator. Being a diode normally operated in the reverse bias and at the breakdown voltage, the zener diode allows the current to keep the voltage across the diode close to the zener breakdown 4.8 voltage. Therefore it protects other devices against voltage pulses.
Design Drawing
schematic diagram
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PCB
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ID Name Designator Footprint Quantity
1 S9012 H Q1 TO-92(TO-92-3) 1
2 1N4007RLG D2,D1,D4,D3,DB DO-41 5
3 1N4732A DZ DO-41 1
4 1K R2 5W RESISTOR 1
5 Header 1*1P B+,B-,LED+,LED-,L,N HDR-1X1/2.54 6
6 270 R1 5W RESISTOR 1
7 Glass tube fuse Slow break3S 3A/250V F1 3.6X10 1
8 FUSE19560 F2 19560 1
9 47uF C1 CAP-D5.0XF2.0 1
10 Y2/250V C2 CAP-9.5*3.5-7.5MM 1

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