AAA wireless 25 leds

[Gav]

hi all, this is my first wireless set up i could never have done it without this forum, thanks to all

click to open

Gav

[StweenyA]

Hi, that looks exciting, are those pancake coils? Please describe your setup

[Gav]

yes they are pancake coils, the transmitter is a coaxial cable wound in a bifilar pancake coil made from 15 turns, using a B772 K PW transistor (not sure where i got it from?) and a single AAA battery. the receivers are single wire wrapped in a normal pancake with leds attached to each end of the coil. i have to give Slider2732 the credit for this as i followed his work and advice. thanks Mark
the weird thing is that i tryed it with a 9v,AA and AAA and the AAA works best even though it is the smallest of the batteries. its very cool though and has opened a few non beleivers eyes

Gav

[Slider2732]

Always a delight to help you out Gav, you're a do'er as well as a thinker.
The first time wireless energy is seen it completes many a struggle and then opens the door to what can be furthered.
That was the whole point with the Simple Wireless Electricity system...just to get an idea of it all in a hopefully straightforward way.

I'm having trouble starting the video...will try from your Photobucket link.
*Edit* watched it...nice BAC transmitter there too !


The higher power causes a saturation that needs a system to rebalance. That's where the water resistor came from. If you put 2 pieces of steel into a beaker of water and run those in series to the Base of the transistor, then your higher voltages will work. Again another easy enough solution to allow for the higher voltages.
Realistically, for amp draw lowering, you should put a 24K or so resistor from the positive battery wire to the Base and use a diode on the Base connection. But, it starts getting a bit more complicated and the setup runs as it is


Datasheet for your transistor: 2SB772 Datasheet pdf - Silicon transistor - NEC
(remember the '2S' in front for many transistors, to find the datasheets)

[Gav]

thank you the water and higher voltage should increase the range aswell yea? im up for it and will give it a go i wont learn without trying

Gav

[Slider2732]

Yep, the water resistor will enable the higher voltage running (and you can just drop LED's in the water to get them to light up, good fun if nothing else).
Using an MJE13009 would help too, though your B772 is quite a capable mid sized transistor. For LED's, I get 3ft with 2x BAC pancakes on 12V

[Zardox]

Slider
- I have a basic stupid question as I have a bunch of old and stiff coax cable. Did you glue the coax as you spooled it or how did you get it to stay in form?

[Slider2732]

Yeah, glued as I went
If in the USA, you can get packs of 3 of superglue from Dollar Tree or Walmart. A couple of drops at unequal places as you turn the wire works well..sets in about a minute.
Other coil materials work fine, smaller coils too, but the BAC sizing and hence name (Big A$$ Coil) allows putting lots of different receiver coils around above and on top of it.
Preshaping is an advantage too, just coiling roughly before it gets put in place. I wound both of my BAC's on the kitchen floor, prebending a bit, wrapping, adding glue and onward. Only takes a few minutes and you don't even need to use a full small tube of the superglue for 12" or so coils

[Gav]

i used my hands and feet to hold it in place at the same time it worked well though, i found preshaping the coil stopped it from twisting as i wrapped it aswell

[shylo]

Very Cool

Can I see exactly how to replicate??
I have never seen anything like that!:surprise:
I do alot of experimenting would like to give it a whirl
Excellent post
shylo

[Gav]

Simple Wireless Electricity System - YouTube

i thought everyone allready knew about this and how to do it so i didnt go into alot of detail at first

[Slider2732]

And...
Here are my BAC's, with several experiments to show how they run: Simple Wireless Electricity - Part II - The BAC's - YouTube

[shylo]

Wow that second video running sixty feet away
Was that 2 strands 12' wound bifilar?
Does it have to be coax cable? What I mean is coax is just a copper wire with an insulated layer ,then aluminum wire wrapped around that ,then a final layer of insulation.(correct)?
If you reduce the thickness of the layers of insulation between the copper and aluminum, maybe it would increase the range or power transfer??
Awesome stuff
shylo

[Gav]

i dont think it has to be coax cable, 2 normal wires side by side should work as long as its wound into a bifilar
i also wondered if the thick insulation decreased the range but i think that is a question for Slider, im also wondering if the thickness of wire makes a difference also, i might rip apart some jumper cables for starting a car with a flat battery and winding them into a bifilar might be worth a try

[Gav]

hi all, i still cant believe this transmitter is transmitting electricity, ive made an extra large reciever coil that is as big as the transmitter, it gives a better range and also increases the brightness of the leds, im still using the same old pre used AAA battery that i set it up with, im really facinated with it, i hooked it up with the plate of 24 leds and has now been running for 2 hours straight, all up the AAA battery has been used for around 3 1/2 hours on the set up, the 24 leds are still shining bright. how is this AAA battery powering this? this is why i cant believe that it is electricity it is transmitting and there has to be another reason, im sticking to my theory of the excited particals in the wire until i can work it out, can anyone help me out with links or info on how it actually works? id really like to know more about it, everything i find talks about transmitting electricity?? but? a AAA battery will not power the 24 leds on its own and its been running for too long now for me to believe in the electric theory, any help would be much appreciated

Gav