Self Running Micro TPU, with closed loop.

[sanmankl]

By the way, I picked up 2 rolls of iron wire at my local tesco. It's called "garden wire" Comes in 60 feet roll. It's not the same quality as my white-coated  iron wire but I'm not complaining paying about US$0.80 per roll.

Managed to kill another 2 Blue LEDs and a 2N2904 in the process.....

Next stop: wound the big torroid and test.
[/quote]
If you could post a picture of your newly wound coil, that would be appreciated.  I must try to locate pure iron insulated wire.  I suspect the wire I used the other day was an alloy.  It was made in china, and does not say.  It was probably lead wire!  LOL   

You may want to try higher voltage rated LED's and Transistor if you keep frying them.  That may turn out to be a good thing!

Touching the LED and it comes on, well, that is just strange.  I will try that tonight when mine dies.

[/quote]


@all,

Here' a cellphone picture (sorry about the quality but it's convenient)

I have already rewound my big torroid so here's the picture of the new coil. Below are 3 more coils. The one on the left is an all iron wire and the two smaller ones are all copper.

I'm going to try some coil configuration this evening to see if I can get better run times. Looking at my testing notes, many more turns may not give better run times........so many configs to work on....

Cheers, cp

[wattsup]

@guys

I did some tests with my first Cook coil that I made some time ago, which for those who are not familiar, is a pair of secondary/primaries on 2 straight iron wire cores or iron rod cores. Anyways, this gives me two secondaries and two primaries to work with. I connected one secondary as the recapture, one as the other coil. This leaves me with two primaries as trigger. These are big winds compared to the ferrite coils and light times are very short, but I have seen something crazy.

I connected the primaries in series and time was about 8 seconds and could see the blink. I connected them in parallel and time was about 4 seconds. I then connected one side of each primary to the trigger locations and left the other sides open and time was about 20 seconds. Pretty crazy.

I wonder if each open end was connected to a collector plate, if this would help more.

There is a direct and noticeable relationship between the trigger length and run time and if you have two triggers with only one side connected, this doubled the time. So guys, maybe try to wind two shorter triggers and try connection combos.

Today we have a major snow storm, so best thing is not to go to work and do some more testing. Ho Ho Ho.

[EMdevices]

@all,   good job guys, I'm pleased so many people like the circuit and are replicating and having fun.

@bruce,  I used different cap values, but the larger the cap and the larger the resistor, the longer the interval between flashes. (I'm talking about the small cap not the main 1000 uF cap) I think my longest results were obtained when it flashed every few seconds ( I think I used a 22 uF cap and 1 Mohm resistor, or maybe it was a 10 uF cap.)   With each flashing, even though we recycle the magnetic energy that has built up in the torroid, there are small losses.  I like your idea of using a smaller capacitance for the main cap, so you don't have to wait so long.        By the way, I've been taken with the Stiffler project for now, but I plan on returning to this one shortly.

Here's a bit of engineering, make sure you opperate in the linear portion of the inductor, before the IR losses take effect, in other words, if the small cap value is too high,  there will be enough charge in it to drive the base current for longer then necessary and the collector current will increase linearly at first but then the resitance of the windings will start to become significant and losses will result.   So, use lots of turns of wire if you want to scale up to bigger caps.  But, I like the idea of working with smaller cap values so we can quickly gage whats happening.   (A scope is a good thing to have    )

EM

[wattsup]

@EM

I will try like you say.

@Guys

Look at this site for toroids. Kind of makes your mouth water.

http://www.beverlymfginc.com/

I think I'll send them an e-mail and ask them to visit this thread at OU.com. Maybe one of them can give us some pointers.

[scorpio]

@ btentzer

OK. You have right. What can I modify the circuit for more efficiency with 1000 uF cap?

scorpio