Joule Thief

[stprue]

Everyone,
Here are my experiments with JT, I ask to see
http://www.youtube.com/watch?v=232XTXVj4jE
http://www.youtube.com/watch?v=Ffb1MFMJjYw&feature=channel

Very nice Zhak, can you give us a little more into.....i.e. caore type and bulb type (volts/ma to light). 

Seems to be a very simple and powerful BJTC.

Regards...Stew

[freepow]

  Hello everyone, I've been off for a fair while,  I now have a Velleman PPS10 scope, it works very well, except not sure why computer does'nt recognise the rs232 cable?
anyway I measured my (Joule thief LED power supply) at  1253 Vdc at 125 Khz frequency.
Can anyone help me with why the PC wont recognise the rs232 cable?

[conradelektro]

@ freepow

May be you have done that, just to make sure.

From this page you can download the "user manual" and the "PC Software":

http://www.velleman.eu/distributor/support/downloads/?code=PPS10

Download and install the "PC software".

On page 61 of the "user manual" (may be you should also download the user manual) it is said how to connect the PPS10 to the PC.

During installation of the "PC Software" or after the installation (usually in the menu "settings") you can probably set the COM-Port (ususally COM1 oder COM2). COM1 oder COM2 is the socket on the PC where you connect the RS232 cable from the PPS10.

Feel free to send me a PM (personal message) in case that did not help. Unfortunatelly is does not make sense to install the software on my LapTop because it is a newer modell without COM-Ports (no more RS232 sockets on modern PCs, only USB). But I can try it on an older PC (which is not used any more, but still in my house) in case you can not solve the problem. Of course I do not have a PPS10, but I could look at the software how one specifies the communication parameters. But may be you find that yourself.

Greetings, Conrad

[Pirate88179]

Conrad:

Excellent response.  I would add that you can get rs232 to usb cables fairly cheaply.  That might help with your laptop.

Bill

***EDIT***  Here is one that would work:

http://www.usbgear.com/item_288.html

[Mk1]

@all

My new invention Jt , uses the audio speaker idea ...

I hope you like it , we may have to also put magnets on the outside of the coil ...

Mark