Joule Ringer!

[Groundloop]

Hi All,

I have made my version of the Lasersaber Joule Ringer version 3.

I use an air core (see image for plastic bobbin size) coil in my design.
The oscillator runs at a center frequency of 167KHz. I light up a 12 Volt
1,8 Watt LED bulb (real Watt used if run from 12 Volt DC) and the LED
bulb is light at full brightness. I get a little over 13 VAC out with the LED
bulb as a load. My circuit runs from two AA batteries in series.

Added: The transistor and coils stays cool when running, but the circuit uses
too much current from the batteries, so the batteries get hot (approx. 40 degrees Celsius)
when running. So I need to see if there is a possibility to reduce the input current usage.

Added: I have tested the circuit on one AA battery. The circuit did use 0,5 Ampere and the
output was 11,7 VAC with the LED bulb as a load.

Groundloop.

[conradelektro]

Hi All,

I have made my version of the Lasersaber Joule Ringer version 3.

I use an air core (see image for plastic bobbin size) coil in my design.
The oscillator runs at a center frequency of 167KHz. I light up a 12 Volt
1,8 Watt LED bulb (real Watt used if run from 12 Volt DC) and the LED
bulb is light at full brightness. I get a little over 13 VAC out with the LED
bulb as a load. My circuit runs from two AA batteries in series.

Added: The transistor and coils stays cool when running, but the circuit uses
too much current from the batteries, so the batteries get hot (approx. 40 degrees Celsius)
when running. So I need to see if there is a possibility to reduce the input current usage.

Added: I have tested the circuit on one AA battery. The circuit did use 0,5 Ampere and the
output was 11,7 VAC with the LED bulb as a load.

Groundloop.

The important thing in this circuit is the "electromagnetic flux" in the coil:

When using a big Ferrite core, a high "electromagnetic flux" with a relative small number of wire turns can be reached, which translates into a high Wattage of the lamps which can be lit to full brightness. Therefore we see people light incandescent lamps which need 20 to 40 Watts with big Ferrite cores.

Air cores have in theory no saturation (in contrast to Ferrite, therefore size matters when using Ferrite cores), but one needs a very high number of wire turns to achieve a high "electromagnetic flux".

Groundloop's air core needs at least 5000 to 10.000 turns for the secondary and 500 to 1000 turns for the primary to get what he expects.

With an air core geometry becomes a factor. To achieve a high electromagnetic flux, one needs to put many turns of wire in a small space. That translates into "thin wire", which has a practical limit.


Limiting the current draw of the circuit:

To limit the current draw a resistor is needed between secondary and base (e.g. try a variable 1 K resistor). But of course, when limiting the current draw less current will be available to light a lamp. When trying to light a 10 Watt lamp to full brightness at least 10 Watt have to flow into the circuit.

Many lamps (e.g. LED lamps) look fairly bright when feeding less than the specified Wattage into them. And in some applications the limited light output might be sufficient.

Greetings, Conrad

[b_rads]

Here is a very simple 120VAC LED Bulb inverter using Lasersabor’s Joule Ringer 3.0 Circuit.   I used a RS (Radio Shack) 12V center tap transformer for the 6VDC and 12VDC tests and a 9VDC transformer liberated from a wall wart power supply.  Power from 12V 5Ah AGM Battery.  Results posted using a 7.5watt Utilitech LED 120VAC Bulb
-   6VDC connection ~ 830 mA = 9.96watt, Bulb extremely bright.
-   9VDC connection ~ 350 mA = 4.2watt, Very nice light output.
-   12VDC connection ~ 25 mA = 0.3watt, Very dim light output.

Using LOA 1.2watt LED 120VAC Fan Bulb
-   6VDC Connection ~ 1.4watt â€" extremely bright.
-   2 bulbs ~ 1.45watt â€" extremely bright.

Transistor runs cool on all tests conducted.  I will video and get some LUX readings this weekend and post.

Thanks,
Brad S

[lanenal]

I rearranged the components a little bit to make the circuit diagram easier to read. Hope this helps replication.

[NickZ]

  Here is a couple of pictures of my yoke core. It has 20 turns primary on one side of the yoke, and about 250 on the opposite side of the yoke of 28gauge. It's working pretty good considering that there is not a lot of turns on it. Transistor is a MJE (TIP) 3055. Running on a bad 12v battery. Transistor is stone cold,  like its not even being used.  NO HEAT, at all.  Showing a 25wtt Cfl, and the circuit will brightly light 65 watt Cfls, also, but not full on, yet.