Joule Ringer!

[DreamThinkBuild]

Hi Lasersaber,

Great work on the circuit, thanks for posting.

Hi Peanutbutter,

Thank you for your modification, I was able to make it work off a standard transformer with your bias resistor addition. I noticed that one 20watt incandescent light (15vdc,40ma) I can tap the resistor to positive then take it off it will continue to oscillate. For most though they did not show this effect in the current setup.

I have it setup where I'm popping pieces in and out to test so it doesn't look very pretty. (attached pic)

First off this IS NOT an exact replication of Lasersaber's. The parts I'm using have been salvaged from TV/CRT monitors.

The input voltage is 15vdc from ultra-caps.

The working NPN transistors I have tried are TD880, TD1426, C1061. All pulls from CRT's.

I went through a bunch of small transformers and couldn't get them to work with my setup. Seemed like the larger gauge windings the better. The current one has primary of 3.03mh and secondary of 2.7mh. I've got an e-core coming in so I can build Laser's setup.

Now something that is very interesting with this circuit is how it seems to match the load. If you place a bridge rectifier on the output and feed it to a DC motor as the motor speeds up the current drops but the oscillation(whine) will also increase. I used a standard bridge and a 18vdc Dewalt drill motor. It initially draws 15vdc,3amps but as the oscillation increases it speeds up and current drops to 2.89amps. This is unloaded so it's not much of real world example but I found it interesting, maybe someone else can try.

[powercat]

One from Lidmotor _{Super Joule Ringer 2.0  -- My Replication}http://www.youtube.com/watch?v=o0fCQghOQ-E&feature=uploademail

[Peanutbutter29]

@Dream, glad to see you got one working and the resistor helped.  It seems to guarantee about any coil can oscillate;  power out on the other hand is Q and Core loss related. 
  I posted a video giving light output comparisons with the same LED on 120 mains;  using a light meter.  I also explain more how the system works, and the resistor.  Also,  how to know if you can oscillate without a base connection.  Finally I show another improvement with the addition of a L3 coil AFTER the load.
All necessary measures are taken to show input, light, and then % base output. 
  Shows that oscillation without the base can be more finicky.  Just me changing my caps I've been using across L1 and L2 made the single bulb not able to oscillate without the bias tie. 
http://www.youtube.com/watch?v=Hw_-2c19YwI&feature=youtu.be
I've got part 2 uploading, but will list that in a new thread; as it's pretty well a different system.  Not possible without Lasersaber's base design!!! Ty again there.

Hope this helps
Thanks

[27Bubba]

Impressive! The transformer you are using is single output secondary?

[conradelektro]

Air core Super Joule Ringer

I could replicate the Lasersaber Super Joule Ringer with a big air core (diameter of coil 255 mm, 200 turns secondary at base of transistor, 2 turns primary at collector of transistor). See the attached circuit diagram and the photo.

This coil stems from other experiments and I think the primary at the collector of the transistor needs a few more turns. When I find time I will play with different number of turns for the primary. My guess based on Joule Thief experience, about 20 turns will be right. Also the position of the primary on the secondary (near one end) is important.

As with the Joule Thief type circuits in general, the air core allows for higher frequencies (in the inaudible range), in my case it is about 300 kHz.

The idea of Peanutbutter29 to bias the base of the transistor with a resistor towards the positive rail works really well. It allows tuning. Without this tuning mechanism it is difficult to make the circuit swing. Tests with different lamps showed that the resistor should be near 1 K (up and down).

The circuit also works like a "exciter" (see the Avramenko plug with a blue LED in the midle of the coil).

Greetings, Conrad