Electromagnetic Flashing Stickers - Page 2 - Electronic Circuits Projects Diagrams Free

Clyd3 · 11th July 2004, 06:52 AM

Thanks a lot, I want to try this very soon.

Someone Electro · 11th July 2004, 06:56 AM

You cod try making a coil of wire thin wire and conecting a low curent led to it.Stick it to a phone and try to make a call.

rahul986 · 11th July 2004, 07:23 AM

I could find LEDs which work @ 2mA. I guess this would be sufficient. I buy one and do as you said.

vaineo · 11th July 2004, 02:04 PM

What size coil would you be using, are you talking about using hundreds of turns or just a few?

Someone Electro · 11th July 2004, 03:01 PM

I think 30 thurns shod do.Here the biger the beter is NOT true.Becose if you use a to big coil it will have an to high inductace wich will mean it codnt pick up the high freq. radio signal so well.So if you try to make a realy big coil you have to keep the inductace of ti to the minimum.

Try eksperemantig whith the coil!

rahul986 · 12th July 2004, 03:38 PM

Nope. I tried that but in vain. The LED just didn't glow. I used 40 turns of coil around a 1cm diameter material. If anyone of you got it right can you post the circuit so that I can cross check with mine. Anyway before I get a reply, I'll try out the circuit in my college's electronics lab.

**Nigel Goodwin** · 12th July 2004, 05:05 PM

Quote:

Originally Posted by rahul986

Nope. I tried that but in vain. The LED just didn't glow. I used 40 turns of coil around a 1cm diameter material. If anyone of you got it right can you post the circuit so that I can cross check with mine. Anyway before I get a reply, I'll try out the circuit in my college's electronics lab.

I would suspect you need the coil tuned to the output frequency of the phone, this is likely to be very little of a coil at all for the frequencies involved.

Someone Electro · 13th July 2004, 04:47 AM

I gues the iron core you used gave it to much inductance(The signal broke it self).You shod try whith air core and a flat coil.Or meaby 40 thurns is to much.As i sead eksperement. (Try difrent tipes of coil,difrent number of thurns,difrent wire...)

rahul986 · 13th July 2004, 04:01 PM

Hmm. I'll try that. May be i'll need some time for that. Before that if anyone gets some other idea please post it

grrr_arrghh · 13th July 2004, 04:22 PM

there are quite a few 'mobile phone trackers' circuit diag around on the net, maybe that would give you some hints as to frequencies etc.

i seem to remember that a mobile phone signal (unless decoded) 'pulses' - maybe this would be some use in getting the LEDs to flash...

just my thoughts

Tim

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11th July 2004, 06:52 AM	(permalink)
Clyd3	Nice Thanks a lot, I want to try this very soon.

11th July 2004, 06:56 AM	(permalink)
Someone Electro	You cod try making a coil of wire thin wire and conecting a low curent led to it.Stick it to a phone and try to make a call. __________________ Il give you shocking experience.

11th July 2004, 07:23 AM	(permalink)
rahul986	I could find LEDs which work @ 2mA. I guess this would be sufficient. I buy one and do as you said.

11th July 2004, 02:04 PM	(permalink)
vaineo	What size coil would you be using, are you talking about using hundreds of turns or just a few?

11th July 2004, 03:01 PM	(permalink)
Someone Electro	I think 30 thurns shod do.Here the biger the beter is NOT true.Becose if you use a to big coil it will have an to high inductace wich will mean it codnt pick up the high freq. radio signal so well.So if you try to make a realy big coil you have to keep the inductace of ti to the minimum. Try eksperemantig whith the coil! __________________ Il give you shocking experience.

12th July 2004, 03:38 PM	(permalink)
rahul986	Nope. I tried that but in vain. The LED just didn't glow. I used 40 turns of coil around a 1cm diameter material. If anyone of you got it right can you post the circuit so that I can cross check with mine. Anyway before I get a reply, I'll try out the circuit in my college's electronics lab.

13th July 2004, 04:47 AM	(permalink)
Someone Electro	I gues the iron core you used gave it to much inductance(The signal broke it self).You shod try whith air core and a flat coil.Or meaby 40 thurns is to much.As i sead eksperement. (Try difrent tipes of coil,difrent number of thurns,difrent wire...) __________________ Il give you shocking experience.

13th July 2004, 04:01 PM	(permalink)
rahul986	Hmm. I'll try that. May be i'll need some time for that. Before that if anyone gets some other idea please post it

13th July 2004, 04:22 PM	(permalink)
grrr_arrghh	there are quite a few 'mobile phone trackers' circuit diag around on the net, maybe that would give you some hints as to frequencies etc. i seem to remember that a mobile phone signal (unless decoded) 'pulses' - maybe this would be some use in getting the LEDs to flash... just my thoughts Tim