Showing posts with label an. Show all posts
Showing posts with label an. Show all posts
Thursday, March 14, 2013
How to Make an LED AC Voltage Indicator Project Do it Yourself
A simple construction and accurate result are the main features of this tiny circuit. Learn how to make ac voltage indicator from led in a most simple and easy to understand method.
The AC mains line that we get in our household electric socket outlets, may at times be full of dangerous fluctuations. These may either be in the form of a sudden high voltage or a low voltage. Both the situations can be very “fatal” to our sophisticated electronic equipments like TVs, DVD players, refrigerators, computers etc to name a few.
A simple electronic part such as an LED can play an important role in displaying the condition of this AC mains voltage and warn us of a possible electrical hazard.
Yeah, we will exactly learn how to make ac voltage indicator from led through a construction of a little electronic circuit.
Parts Required
You will need the following mentioned parts for the project:
TRANSISTORS T1, 2, 3, 4, 5 = BC547
ZENER DIODE Z1----Z5 = 3 VOLTS / 400mW
RESISTORS R 1—R10 = 1 K ¼ WATT, CFR.
CAPACITOR C1 = 1000uF/25v,
DIODE D1 = 1N4007
LED 1, 2, 3, 4, 5 = RED 5mm DIFFUSED
PRESET P1, 2, 3, 4, 5 = 47K LINEAR
GENERAL PURPOSE BOARD = 6” BY 2”
TRANSFORMER = O – 6 VOLTS/ 500mA
How to Construct the LED AC Voltage Indicator
It is completed through the following few easy steps:
In the procured general purpose board, with the help of the circuit schematic start inserting the transistors first in a straight line and solder their leads.
Similarly insert and solder the resistors, zener diodes, LEDs, capacitors, presets etc. in an organized manner and solder them with reference to the circuit diagram.
How to Test the Circuit?
The following testing details will furthermore help you to understand exactly how to make ac voltage indicator from led:
For testing the completed circuit board you will require a transformer with multiple voltage outputs.
Connect the transformer to the AC mains; also connect the common secondary output of the transformer to the negative point of the circuit.
Make an alligator clip/ wire assembly. Solder the wire end of the clip to 1N4007 diode input.
Now bite the clip to the 3 volt output of the transformer, adjust P1 so that the first LED just starts glowing.
As above go on connecting the clip to 6, 7.5, 9 and 12 volts of the transformer and adjust the presets P2, P3, P4 andP5 so that the relevant LEDs just start to glow at the respective voltages.
This completes the testing and the setting of the circuit.
Finally join the 6 volt transformer to the circuit and switch ON the power. You will find that LED 1, 2 and 3 are glowing brightly, LED no.4 is glowing with less brightness while the last LED is completely OFF, indicating a safe level of AC mains voltage.
Now in case the voltage exceeds a high level (above 260 volts) the last LED will start glowing brightly indicating a dangerous situation.
If the voltage drops to a dangerous level (below 160 V) LED 3 and may be LED 2 may cease to glow, again indicating a bad low voltage.
Wednesday, March 6, 2013
Make an Efficient 40 watt Electronic Ballast Circuit
From my experience the ballast uses some of the power but it somehow pushes more power in to the lamp no matter it's rating. Sort of like pushing a 120v incandescent bulb at 140vac instead of 120vac, it's brighter and uses more power but won't last as long. I also have some "green" shop light and it uses 65w no matter what 4 foot tubes I put it in, I tried the stock 40w, 32w and even a 28w and the kill-a-watt said 65w no matter which one was in there. the 28w tubes looked the brightest, but there wasn't much difference.for full detail can be found here
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