Thursday, October 18, 2012

Pakistan Science club's DIY project Homemade inverter ups

Pakistan Science club's DIY project Homemade inverter ups


Video Part One


Video Part two


REQUIRED  THINGS  MADE  A  SIMPLE  INVERTER:

1.  12 by 12 Volt transformers.
2.  2 Transistor (1047).
3.  Copper wire for winding OR for an additional coil (Note: The number or gauge of copper wire must be identical as that of secondary coil of transformer).
4.  Vero-board.
5.  2 (1 k-ohms) resistance.
6.  2 Heat sinks.
7.  Wires.
8.  Screws or nuts.
9.  Paper.
10. Battery as the input or source.

TOOLS REQUIRED:

1.  Solding iron with solding wire.
2.  Multimeter.
3.  Screw driver.

PROCEDURE:

1.  First we have to do winding (additional coil) in between the gaps of the transformer in the direction of secondary coil (decide whether the coil of secondary coil is in clockwise or anti-clockwise).
2.  Use a paper strip to cover the coils of the transformer.
3.  Give 5 turns to the wire in direction of secondary coil, at the center twist the wire in order to make a third or center terminal, then again give 5 more turns. In this manner you will get three terminals. The purpose of making these three points is that we can use our transistor easily which is of three terminals, more ever the one is for pulse generation while the other two serve as the load  terminals.
4.  Now find the base of the transistor by connecting it with multimeter i.e. the terminal which gives reading on both of the other two terminals when positive end of the multimeter connects to it. Mark the base by either slight twist or another means so that you can remember it easily.
5.  Take a Vero-board and insert the two transistors in it and sold them.
6.  Join the pieces of wire at base and emitter of the both transistors by means of solding.
7.  Connect the collector of the transistors with one another with the help of wire.
8.  Sold the resistance of 1 k-ohms between collector and emitter of each transistors.
9.  Join the heat sink with both of the transistors with the help of screw or nuts.
10. Join the emitter of the transistor with one terminal of the secondary coil (transformer), similarly for the other one.
11. Connect the base of the transistor with one end of our additional coil, in the same manner for other end. (Note: The connections are made with the starting and ending terminals of the additional coil and not with the center or twisted one).
12. Now join the wire with center terminal of the secondary coil (transformer) which would act as the positive terminal for the input (Join it with positive terminal of battery). Similarly join another wire with the twisted end (the center terminal of additional coil) which along with collector wire will serve as negative terminal for input (Join it with negative terminal of battery).
13. The load will be connected at the base terminals of the transistors which were already joined with the terminals of the additional coil.
14. The simple inverter is ready to test now. With help of some changing, it can easily be converted into a UPS.

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