Joule Thief

[MrMag]

IST, the video you posted doesn't make sense at all. You are showing the meter reading current and then switch it over to read volts. I have never seen a meter where you can switch between voltage and current without changing the input lead to the meter. Another problem is that you can't be showing both voltage and current since you don't change the location of the probes when you are taking the readings. The current is measured in series with the circuit and the voltage is parallel. Someone with over what is it 150 inventions should know better than this.

[jeanna]

http://www.youtube.com/watch?v=041LPyBJULs
Bill

When I was a kid I'd go to the new jersey shore with my folks, and I always brought my radio. (had to be  of course ) The reception was really bad, and I couldn't count on getting anything. But that sound was there all over the place. I think it was the ship to shore or radar . Probably ship to shore tuning in. Just exactly like that.

Who knew they had the joule thief back in the 50's and 60's?   

Great to have that  on the video, Bill.

thanks,

jeanna

[Pirate88179]

For what it is worth, both of my DMMs will switch between amps and volts without unplugging the probe leads or moving them to a different location on the meter.

Bill

[MrMag]

Pirate, I have never seen that before. Can you please let me know the make and model. I would like to check that out.

[Pirate88179]

@ Jeanna:

Thank you.  I am not sure but I think this means that when we turn our circuits on, the transistor does not instantly begin working at whatever frequency it and the coil wants to.  It starts at a much lower frequency and ramps up.  The led appears bright, as usual, but I think that is because even at the lower "start-up" frequency of my circuit, it is still much higher than 60 or 70 Hz so my eyes see the LED as "on" anyway.

Yes, maybe that was radar or something like that.  There were and maybe still are a lot of research facilities located in that area so god only knows what you were listening to.  I miss the Jersey shore, at least the way it used to be.

Bill