Joule Thief

[nievesoliveras]

@all

Hi!

I see that there is a lot of activity on the thread.
I am a little behind, but eventually I will catch up.

Jesus

[gadgetmall]

Ok, so it's using 22ma or so.  No surprises there.  Apparently a fuse had blown in my ammeter.

Thats a good Point ! It happens all the time in mine . you were probably Measuring right if you ever stick an amp meter across a battery it will usually Blow it then and there ! Keep Testing guys .. You all are great guys and this is a A great Thread !


@ IST . Hows it Going with that new Light . ?  I got a little circuit for it . it runs off a 555 timer and detects the voltage at apreset level then flops it over . Check it out !

[jadaro2600]

Why is the 2N3739 preferred over the 2N2222?

Is this a matter of switching frequency?

I also have a question about this setup with regard to that transistor:  When current is flowing through the collector to the emitter, is it not flowing through the base?

Also, how do I measure the frequency - across the E C terminals?

I've edited this post several times now ... I couldn't get the low current version to work, i'll try again, maybe there are some sacrifices I could make or some switches.

[innovation_station]

gadget i like it 

i have a bunch of 555 round here too

lol


but this mk2 family board ROCKS ..... 

ill post a sneek peek soon 

ist!

[Pirate88179]

Bill

Thanks for the  link.

I found  a few other things on that site that  I have been  looking for .



I saw that  they  have  super caps there.
Do you know if super caps can  be put in series  to get  a higher effective  voltage? 

gary 

Gary:

I have read in several places that you can't put any more than 3 supercaps in series without some fancy controller being involved.  I have no idea why this might be but I have seen warnings to that effect on several supercap suppliers sites.  Digi-Key is a better supplier for supercaps than EG.  Less money for much larger caps.

Bill