Joule Thief

[xee2]

@ crowclaw

Xee2,
I'll set it up again and post the results for you, have got several projects on the go taking precedence at the moment... Kind Regards

This was only a suggestion that I thought might be helpful to you and others. I do not think it should be something considered important to do.

[Cap-Z-ro]

Interestingly, on Dragons Den this week a guy had replacement tubes for fluorescent fixtures made up of an array of led's aligned to focus their light on a fixed radius...ideally suited for product display.

I believe this appears to be different from the products offered on the above site.

Four out of the 5 Dragons invested in the lighting system.

Regards...

[crowclaw]

@ crowclaw

This was only a suggestion that I thought might be helpful to you and others. I do not think it should be something considered important to do.

Xee2
It's no trouble and not a problem. As you have mentioned you have not got the advantage of a scope, It's my pleasure where ever possible (time allowing) to be able to offer my help and advise to benefit others.

[jadaro2600]

A word of warning to anyone ordering from Goldmine Electric; they seem to take their time with orders ...

I ordered a huge list of things, but it took them four days to find it all, and next time i'll spring for expedited shipping, that alone is going to take a week - everything seems to stop in Texas ( I wonder why ).

@ All:

I just got a sale e-mail from electronic goldmine...check this out!

2,000 leds (green) for $25.0.

You can find them here:

http://www.goldmine-elec-products.com/prodinfo.asp?number=G17409B

Bill

The flyer-before-last had some interesting 1M ohm potentiometers that I ordered, it should be interesting to test with that range.

They also purport to being an on-off switch.
- - - -

So, what is preferred, this tin-can style transistor or the plastic ones?

Which ones have greater thermal stability?

- - - -

Has anyone tried my diode-mod?  http://www.overunity.com/index.php?topic=6123.msg225867#msg225867

I was wondering, because I don't have a decent toroid wound at the moment.

[mscoffman]

Was in a convenience store today and they were replacing flurescent A in a freezer compartment with leds enclosed in a mechanical enclosure that fits in the same space as flurescents.  The leds are what the young man called lazer diodes.  These are at the bottome of a reflective cone. 

Laser diodes are monochrome photo diodes with all the photon wave
fronts synchronised - leading to lack of normal angular spreading and
much higher effective power. People seem to have a problem with
differentiating this, but public eye safety demands the laser diodes
not be accidentally mixed with any other type of photodiode. There
are the things you can see and the things you can't see but can
still hurt you. In my opinion we as technical people need to make
an effort to have folks get this right before they make a mess.

...Remember; "depleted uranium"?

:S:MarkSCoffman