LED-716 is one of the most powerful and very cheep circuit. Try to make at home.
recommended for beginners.
Click image to enlarge.
D1 to D5 = IN4007
Q1 = C945 NPN
Q2 = D965 NPN
C1 = CL-155J, 250 V.
C2 = 100μF, 16 V.
C3 = 1μF, 50 V.
R1 = 1Ω
R2 = 3Ω
R4 = 5.1Ω
R3 and R5 = 1kΩ
R6 = 390kΩ.
Battery = 1300-1600mAh.
LED = 30 Num, color = White.
90-240 V, AC.
Cable = 3A,250V.
(This is what this Lamp using)
Current = 0.1 A.
Power = 1 Watt.
3-Option switch or Pattern change
Option 1 = Full Light
Option 2 = OFF
Option 3 = Normal Light
Backe up Time of the Emergency Light lamp.
At Option 1 ( Full light) = 4-6 Hrs
At Option 2 ( Normal Light) 10 Hrs
Here is the full story that how did i make this post.
actually someone bring me a DP-716 Emergency Bulb.so i took the lamp ( for checking/repairing). here you can see the whole story in images.
(click images to enlarge)
here we have opened for repairing. ( you can also try on such your home appliances, but keep in mind that safety is more important….)
Inside Emergency LED Light. LED-716 Emergency Light.
Now it is clear that what is the real problem in pic ( two resistor were blown out) so now we want to fix it.
another view. check the circuit that what is the problem here.
Here you can see that what i did in this circuit. because the resistor on the back side ( which i have soldered) was blown out. so the root of problem was that specific resistor.
Here we done. Now the pattern change switch is on Option 1 i.e on Full light. the back up time will be 4-6 hours.
And in this case, the pattern change switch is on Option 3 i.e on Full light. the back up time will be 8-10 hours. also note that , option 2 is for turning off the Bulb light.
By : Engr Wasim Khan
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