hsab

hi

simple way to test your transformer :lol:

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lord loh.

Hey...

Can anyone explain this ?

The coil is supposed to provide 0 resistance to DC(The cell). So wont it be just a small change in intensity if the coil is short or not ?

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Bharath Bhushan Lohray.
M.Sc. Electronics.

Nigel Goodwin

The neon flashes when you release the button, not when you press it, it's due to the back emf caused by the collapsing magnetic field in the transformer. It's the same effect used in car igntion coils.

If the transformer has a shorted turn it seriously dampens the 'ringing' of the transformer, and the back emf won't be high enough to light the neon.

It works with any reasonably sized coil (not just transformers), even 1mH RF chokes will do it - just wire a neon directly across a choke and briefly apply a battery across it - the neon will flash as you disconnect.

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Someone Electro

if you hold the contacts of an high inductance coil (electromagnet and stuf like that)Wile conecting and disconeting a batery you will get a shock.the higher the indictance the biger the shock.

this is a fenonemom that is cased by the magnetic field.Wen you conect the batery the coil makes an electromagnetic field around it wen you disconect the batery the field breaks down resulting in an high voltage spike on the contacts.

in this tester the high voltage spike is used to flash and neon bulb

This was used and is stil now to make high voltages (an car initon coil is a good exsample)

my shocker in the projets page uses this fenomenon to to make voltages up to 3000V from an 6V batery.

I once toced the electromagnets of an operating bell (run from an batery)I got an shock(it wasent wery plesent)

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positive logic

thats true. i see that circuit before in a magazine. :lol:

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steven

if the transformer works in reverse mode i beleave it may work in forward mode, a simple circuit to test the reverse mode transformer is a simple scr circuit useing an scr and a resister or 2 and a 12 volts battery and a 12 volts auto indicator flasher unit from a car will do the job

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steven from australia

moody07747

hmm

i just use my continuity tester to test transformers

steven

[quote="moody07747"] it can be done with a multimeter set to low ohms to especially for finding the correct outputs if the transformer has 4 or more wires

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steven from australia

changiz

what it will do if there is an open in the transformer primary and/or secondary wiring and my second quwestion is if the transformer is a multi voltage primary and secondary type, should we connect to each of the voltage input/output wires separately

Someone Electro

No flash if the transformer has an broken coil since no curent will run trough.

If it has taps use the uper and the most botom tap since this way you get more inductance

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chaisi

can any one xplain this circuit

Nigel Goodwin

Try reading the previous posts!.

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Hero999

Be careful, if you apply a pulse like this to the primary of some mains transformers and you can get a very high voltage at the secondary (in the order of 10kV), this can destroy the insulation.

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sheldonstv

my multimeter set to ohms does the job........

Nigel Goodwin

But only tests if the windings are O/C.

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