Joule Ringer!

[Pirate88179]

Conrad:

Nice work man.

Bill

[hartiberlin]

Hi Conrad,
nice work.

You could try to put a diode (like 1N4148 or a 1 N4007 or something simular)
parallel to the 500 KOhm resistor
and see, what polarity of the diode will work best.
Maybe this way, only one triggering of the Darlington will happen  ?

[ltseung888]

Does any one here thought of the two oscilloscope experiment to determine whether COP can be greater than 1?

http://www.overunityresearch.com/index.php?topic=538.msg9575#msg9575

[conradelektro]

Remarks on the circuit we discussed in the many posts with the scope shots:

Power consumption and frequency depend on R1, C1 and C2 (see circuit in the picture below).

The values R1=200K, C1=110pF and C2=1000μF lead to about 1KHz oscillation, still double triggering of transistor within about 6μs and a power consumption of about 7 mA at 12V. The 15 Watt spiral CFL has a nice yellow hue, not very bright. It also works with smaller CFLs (8 Watt or 5 Watt) and power consumption goes down to around 5 mA with smaller spiral CFLs.

A diode instead of R1 or in parallel of R1 acts as a resistor (be careful to have the cathode at +12V or the transistor is gone) and does not prohibit double triggering.

Very interesting is the influence of the electrolytic capacitor C2 (R1 and C1 left at 200K and 110pF):
removal or less than about 10μF --> power consumption goes up to 120 mA
10μF to 100μF --> power consumption goes down to about 20 mA - 30mA
1000μF and up --> power consumption varies according to make of cap around 7mA to 10mA

With all the settings of R1, C1 and C2 tested, double triggering was still there. Be aware that also the type of the transistor has a huge influence and whether you use a Darlington pair or not. With the TIP31C a Darlington pair keeps the power consumption down, because R1 can be higher than with only one transistor. R1 keeps the frequency down, high R1 --> low frequency.

C1 must be there, lowers the frequency, but can only be changed in a narrow range with a given R1, with R1=200K from 10nF to 300nF:
10nF  and 200K --> 100 mA (lamp brighter, but not spectacular)
110nF and 200K  --> 7 mA (lamp has a nice yellow hue)
210nF and 200K -->  3 mA (lamp dim)
300nF and 200K --> 1 mA (lamp almost out)

My plans to proceed:
I got tired of the circuit as it is, because it needs 12 Volt. I wait for the fly back transformers (from PC monitors), because I want this circuit with a 1 Volt power supply (AA rechargeable battery at 1 to 1.2 Volt).  You will hear the results, but it will take a while.

Bifilar coil instead of R1-C1:
I did not see any benefit in the bifilar coil. One can also adjust the frequency and the power consumption with the resistor that terminates the coil (can be 1N60 diodes). The bifilar coils seems to play the role of C1, but is more difficult to adjust (because the number of turns has to be changed).

Over unity: well, I never saw any OU in a Joule Thief and also not in this circuit. Nevertheless, it is nice to (dimly) light CFLs or LEDs with little power. For me the practical use is as a novelty item. Specially a Slayer Exciter with a big tower coil and its ghostly lighting of FLs and CFLs when brought near the tower always impresses people. It is a modern Tesla coil and allows similar experiments. Also the AV-plugs with one LED or many LEDs are catching. So, there is entertainment value in the Joule Thief type circuits. To get OU, keep trying!

Greetings, Conrad

My last post (scroll up) shows a photo of the circuit with R1=100K, C1=100nF, C2=4700uF at about 2KHz ,with a power consumption of about 12 mA at 12 Volt.

[hartiberlin]

Hi Conrad,
at what frequency and what input current does the CFL bulb shine bright,
so that it illumintes a bit a dark room and that you could read  a book about 1 Meter away from it ?

Maybe this could be powered by a series stack of aluminium air battery cells
run with K2CO3 and water as the electrolyte, as one cell is then giving out about 1.3 Volts,
so you would need about 9 to 10 cells in series for this.

P.S: Look at the latest Videos here:
http://www.youtube.com/watch?v=ITzAZFYFo_0
http://www.youtube.com/watch?v=UI8Z_LoWoLY

Many thanks.

Regards, Stefan.