Joule Thief

[jeanna]

But im sad cause i blew My Daughters Jewel Thief so im working on another one . Dont try to run another Jt with an led with mk2. it will flash like a camera flash.

Gadget

Good advice. Thanks. I might not have paid much attention to tonight's misadventure.

You BLEW your daughter's joule thief with a MK2??? Is that what you just said?

Too bad it doesn't have quite enough to light a fluoro. I tried it on my 7w 10 inch fluro and it didn't budge it. I guess a cap is the necessary part for this. Maybe a MK2 is enough with a cap.

Here is the problem I had with the MK2.

I could get the 2 pick-ups from each side to work in parallel. But when I tried to add the others they went out...or the led went out ... There could have been shorts, but I didn't see any... come to think of it maybe the led was trying to blow then? hmm.

When I tried to put them in series, I just got nothing.

I am next going to try making something like what Hazens made today but with some slightly different numbers, and by tuning the toroid in the beginning.

Thank you,

jeanna

[xee2]

LEDs can not handle high reverse voltages. If you always use two LEDs in parallel with opposite directions, then they will be able to handle larger reverse voltages since one of them will always be forward biased and thus limit the reverse voltage on the otter one.

[jadaro2600]

re:

LEDs can not handle high reverse voltages. If you always use two LEDs in parallel with opposite directions, then they will be able to handle larger reverse voltages since one of them will always be forward biased and thus limit the reverse voltage on the otter one.

@all,

Is it safe to assume that a bridge rectifier can handle higher voltages than it's single part - for instance, the forward voltage max is 400v but the reverse voltage breakdown is 200v, ..if I have 4 of these on a 300v AC source configured in as a bridge rectifier - can it be assumed that the diodes will be able to take the heat - Isn't the current and voltage prone to flow in the path of least resistance?

I consider this on topic because of the nature of pickup coils in these setups, and the tendency for large surges to be created.

@jeanna, how is that oscilloscope working out?

[xee2]

@ jadaro2600

Full wave rectifier has current flowing through two diodes in series at a time thus will be OK if peak voltage is twice diode rating. Peak to peak voltage can be four times diode rating.

[electricme]

@all,
I got a surprise he he he he he

A tiny ring
its Georgious
its lovely
its a gem
its a joule.....will it MAGNIFYYYYYYYY
should I put 3 JT in 1/3rd spacing?
How many secondaries should I put on this thingi?
will it workkkkkkk.
will it GRUNT lol


and,,,,,,, I got a ..................................potty , now I'm crackers ROFL

all is not as it seems

ha ha
jim