Joule Thief

[gadgetmall]

can some one good in math calculate my results on the LSver3 replication   lights 60 watt 115volt bulb  using 14.5 volts 3.4 amps .what is the cop of this thing?

[synchro1]

can some one good in math calculate my results on the LSver3 replication   lights 60 watt 115volt bulb  using 14.5 volts 3.4 amps .what is the cop of this thing?

You need to determine how bright the bulb is shining with a lux meter. JonnyDavro has a cheap way to measure the Lumens.

[SkyWatcher123]

Hi folks, hi gadget, pretty sure he used 28 gauge wire, though not sure if it is awg. or swg.
peace love light
tyson

[crowclaw]

Hi gadget,  can you put your schematic up again for your JT using those new rods. Also what's the value of your base resistance! if it's to low it will affect the current through the collector / emitter junction and run hot.

[crowclaw]

I'm just mentioning a few general points here, and not wishing to put anyone off experimenting of course. The JT circuit and several other variants of the principles of power invertion via inductance will always show similar results.
Depending on what load we require to work i.e. voltage and current, will itself decide how much current draw from source will be reuired to make it work. To light any type of fillament lamp brightly will take considerable more current draw compared with an LED.  LED's are relatively high impedance semiconductor  devices capable of giving  higher brightness levels with low current and voltage needs. That's why a JT circuit and similar configurations that can provide high output voltages... light several LED's in a series combination and still keep the current through the string at a very low level. Filament bulbs and other devices have far different characteristics thus demand a higher current and likewise greater input power requirements from the source.