Second Stage Joule Thief Circuits

[hartiberlin]

Hi Albert, as we don´t need big currents to power LEDs,
just spare your money and just only use small pencil electrode connections.
Big sized diameter graphite rods are pretty expensive.

You better need to make yourself much more conductive graphite powder
from coal briquets, which my girlfriend found out accidently..

See here:

http://www.overunity.com/index.php?topic=790

Then if you made a few supercaps this way, better put them all in series to raise the
voltage and then put a few LEDs in series also as the load, so this will last much longer this way,
as the lower the discharge current is that you draw from the supercaps, the bigger the capacity will
be and the longer they will last and keep their charge...
So better put many in series and use only low discharge currents.

Hope this helps.

[hartiberlin]

P.S. If you put 10 supercaps in series, which are each fully charged at around 2,5 Volts each,
you already have 25 Volts output voltage.

If you then draw only 20 milliamps and use a load of 8 to 10 white LEDs in series,
which have a threshold voltage also of around 2.5 Volts, this
will last very long to light them up.

[poynt99]

P.S. If you put 10 supercaps in series, which are each fully charged at around 2,5 Volts each,
you already have 25 Volts output voltage.

If you then draw only 20 milliamps and use a load of 8 to 10 white LEDs in series,
which have a threshold voltage also of around 2.5 Volts, this
will last very long to light them up.

This is true Stefan, but I would assume for the OU test, the capacitors will not be starting fully charged. If this was indeed allowed, anyone could win the prize just by using a large enough fully-charged capacitor powering a resistor which is dissipating 1W for 3 months.

Then again, maybe you weren't alluding to the OU prize and were just commenting.

.99

[hartiberlin]

Well, no my last 2 comments were only made how to
best build yourself a few supercaps and power a few LED lights in series,
if you have for instance charged up the series supercaps stack with a solar
panel during the day and use the LED light during the night for independant
grid free light output.

Regarding using supercaps here in the Joule thief, if would also be beneficial
to use more than 1 supercap all put in series, so the JT can charge them up
to higher voltages and higher voltage means also more output power at
the same small load output current.

[gadgetmall]

Hi Albert, as we don´t need big currents to power LEDs,
just spare your money and just only use small pencil electrode connections.
Big sized diameter graphite rods are pretty expensive.

You better need to make yourself much more conductive graphite powder
from coal briquets, which my girlfriend found out accidently..

See here:

http://www.overunity.com/index.php?topic=790

Then if you made a few supercaps this way, better put them all in series to raise the
voltage and then put a few LEDs in series also as the load, so this will last much longer this way,
as the lower the discharge current is that you draw from the supercaps, the bigger the capacity will
be and the longer they will last and keep their charge...
So better put many in series and use only low discharge currents.

Hope this helps.

Hi Stephan No i can get them very cheap actually directly from the manufacture .  . i have many already for earth batteries . pencils are expensive here but i will try it ! also i could substitute paper towels for maybe shamwows. i have acces to barrels of graphite ,carbonize filter  products  and powder chromium  .thank you .
Albert