Joule Thief

[jadaro2600]

cool, my memory is in tact.  wow.  There are a couple of 330uF/200v caps in a burned out computer power supply that I want to use then.  I am trying to look up a transformer that I pulled out of that power supply. I did a google search and found nothing.  the numbers on it are   --  6C03313120 MORETEC 99235C.  How do I get a pin diagram for it???

You'll have to measure the ohmic resistance between the leads, there should be 6 leads, or Five leads and one ground. If there are four leads, then it shouldn't be a problem, you should also ask yourself why the power supply burned out?

Any two leads with an ohmic resistance are a coil, ..6 lead transformers are usually center tapped - this lead can be ignored if you want.  Using the two leads with the least ohmic resistance and the two leads with the most ohmic resistance will give you a voltage boost.

for instance, if there are 6 leads where there is ohmic resistance between 1 2 and 3, and the ohmic resistance of 1-2 is 20ohm, and 2-3 is 20 ohms, and 1-3 is 40 ohms, then pin 2 is the center tap.  Just as well of the other pins, if there is 40 ohms between 4-5 as well as 5-6, the pin 5 is center tap.

using pins 1 and 2 as the coil to base, and pins 4 and 6 as coil to collector will give you voltage boost because there are more windings on coil 4-5-6 than 1-2-3.  This will give you roughly voltage boost V ..while using pins 1 and 3 will give you voltage boost V/2.

IF you follow the diagram that I made for you on your thread, then you won't need a secondary, just a toroid and some mag wire, two capacitors and a resistor and a transistor.  You should not use the secondary, it's a waste of time for your particular circuit because it simply will not provide enough current between commutation switches.

In my schematic, the bulk of current will flow through the motor and not the transistor.  When skipping commutators, the transistor circuit will activate and produce a higher voltage, until it hits another commutator and discharges across the coil along with the current from the battery.

[Eastov]

Dextrix,

   Here's another filament bulb JT circuit that I've been toying with, but mine a non-wireless version.  He's got a link in the description which shows schematics and details. 

http://www.youtube.com/watch?v=2ODW-ntPHSU

E

[xee2]

@ Eastov
check: crowclaw post on  January 22, 2010 Reply 11980

[xee2]

deleted by xee2 -  forum posting error

[innovation_station]

i wound a new gold mine 1"

cat5 wire 1 twisted pair 1 untwisted pair so 4 wires total ..

so there 3 sepreate wires to wind the twisted one is the jt the other 2 outputs ..  all wound togather ..

3 turns per lap ...  so 120 240 360  lap 1 then lap 2 right after  and same with lap 3

this is what it looks like

so as the jt pulses it high speed the core does 3 laps ..

i would expect vhf from this coil ..

ist!