Joule Thief

[crowclaw]

Hi freepow, Your  secondary AC voltage will show a higher reading without a load connected as no current is flowing anywhere. As soon as you connect a load i.e. neon etc the voltage will fall as current flows into the load. The relevant high impedance of your secondary winding to achieve the desired  high voltage is shunted by the current demands of the load you connect across it, which will depict how much voltage you will end up with when the load is connected. Hope this helps... If you are new to electronics look up Ohm's law and also Impedance, an understanding here will help you along. Lastly you scope probe tip is attached to the calibration output test point of your scope. The alligator clip connects only to the grounding point of the circuit under test, the clip is grounded through the scope's BNC connector so leave it free while checking the calibration. Hope this helps. 

[resonanceman]

Hi, thanks for reply,  i measured 88 AC volts when i connected NEON, but it says about 140-150 AC volts without, do you measure AV volts with Neon connected or without

Because without NEON it says 140-150v  but it will only light one Neon, so whats the correct way??

Freepow

Either  way could  be right depending  on what you  are looking for.

With out  the Neon  you  are reading    the voltage   without load

With the Neon you  are reading the  voltage with a  load .


gary

[freepow]

Hello, has anyone tried a super bright white LED rated at 3v 100ma at 360,000 mcd
How bright would this LED be
I am thinking of getting some and trying it on a JT for night lighting for my house, any comments appreciated, thanks.

[IotaYodi]

Approximate luminous flux: 172.180 lumens

As a point of reference, a standard 100W light bulb typically is rated at around 1,700 lumens in North America, and around 1,300 lumens in 220V areas of the world.

[Pirate88179]

Hello, has anyone tried a super bright white LED rated at 3v 100ma at 360,000 mcd
How bright would this LED be
I am thinking of getting some and trying it on a JT for night lighting for my house, any comments appreciated, thanks.

I have lit up to 5 of those with several of my JT circuits.  They were powered either by an AA battery or my EB or EER. (earth battery)

Bill