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 Tesla Pancake coil
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screaminvern
Junior Member


USA
121 Posts

Posted - April 28 2013 :  21:07:02  Show Profile Send screaminvern a Private Message  Reply with Quote
I've been playing around with Tesla Pancake coils since I watched
slider2732's videos. Great stuff! I love how the pancake coil works nicely with the joule thief circuit.

In an Environmental Science class I'm taking this semester, we were discussing ways to reduce energy consumption. I just finished a demonstration of the reduction of energy consumption by manipulating electricity.

I used a joule thief circuit with a pancake coil. I attached 5 LEDs each to their own pancake coil and lit all 5 at once wireless for 99 hours continuous on one AA 1.5 volt alkaline battery.

Not all the LEDs were the same. Two had 2.3 volt requirements for each, two were 2.1 volts each, and the fifth LED I have no idea as I found it on the work bench.





{History does "not" repeat it's self, idiots repeat history.}

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IrishDave
Senior Member



Ireland
850 Posts

Posted - April 29 2013 :  06:02:09  Show Profile Send IrishDave a Private Message  Reply with Quote
Nice Vern - any pics or video?
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screaminvern
Junior Member



USA
121 Posts

Posted - April 29 2013 :  07:48:29  Show Profile Send screaminvern a Private Message  Reply with Quote
I will put a fresh battery in the holder and take some pics Dave; not sure when but asap. I was taken by surprise myself at the 99 hour run time. The class demo was a hit though. Several young students asking questions after class and playing around with the coils to see what the distance was for the wireless energy transfer which was 12.5 cm/4.9 inches.

{History does "not" repeat it's self, idiots repeat history.}
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screaminvern
Junior Member



USA
121 Posts

Posted - April 29 2013 :  08:44:33  Show Profile Send screaminvern a Private Message  Reply with Quote
Just wanted to say that yesterday I set up a standard joule thief circuit and another JT circuit using a "compound pair" of transistors (PNP+NPN) thinking I would get better performance from the AA battery. Not at all! The JT circuit with the single 2N2222a was notably brighter.

{History does "not" repeat it's self, idiots repeat history.}
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screaminvern
Junior Member



USA
121 Posts

Posted - May 04 2013 :  19:31:11  Show Profile Send screaminvern a Private Message  Reply with Quote
Here are some pics of the pancake coils I used for the wireless energy demo a couple weeks ago.

The JT circuit and TP coil:

[URL=http://s805.photobucket.com/user/screaminvern/media/My%20Projects/05-04-13_160808_zps99fdbc6b.jpg.html][/URL]


Coils are about 12.3 cm/4.8 inches in diameter

[URL=http://s805.photobucket.com/user/screaminvern/media/My%20Projects/05-04-13_155727_zps3bbf9c89.jpg.html][/URL]


All five LEDs lighting up on one AA 1.5 volt alkaline battery

[URL=http://s805.photobucket.com/user/screaminvern/media/My%20Projects/05-04-13_155503_zps545d06d9.jpg.html][/URL]







{History does "not" repeat it's self, idiots repeat history.}
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ron_o
Moderator



United Kingdom
1052 Posts

Posted - May 05 2013 :  16:58:29  Show Profile Send ron_o a Private Message  Reply with Quote
Hi Vern

just out of intrest have you tried using a variable capacitor wired in parallel with the led ?

the compound transistor pair really need more than 1.5 volts to work correctly..

you might want to try a ZTX851 transistor ( they are designed to run on very low voltages - used in emergency lighting units running on 2.4 volts )
see Zetex ( diodes ) application notes

ron
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screaminvern
Junior Member



USA
121 Posts

Posted - May 07 2013 :  00:13:00  Show Profile Send screaminvern a Private Message  Reply with Quote
Hi Ron, no I haven't tried a variable cap. The only one I have is that one I built out of HD platters, and I am going to add more platters to it like you suggested back in another thread. This is the last week of school and then finals next week, so after that I will have more time for the important stuff ;)

Thanks for the info on the "compound transistor" and the ZTX851.

{History does "not" repeat it's self, idiots repeat history.}
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ron_o
Moderator



United Kingdom
1052 Posts

Posted - May 07 2013 :  15:00:37  Show Profile Send ron_o a Private Message  Reply with Quote
Hi Vern

A small tuning cap from an old transistor radio would be fine ( the LEDs pull the voltage down to their operating voltage requirements , so HV cap is not required )

hope the exams go well for you

ron
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