Self Running Micro TPU, with closed loop.

[hartiberlin]

Hi EM,
please can you also show a scopeshot accross
the 1000 uF cap ?

And also one across the trigger coil ?
Maybe also directly also across the other 2coils ?
Many thanks.

P.S: Nobody yet tried to rebuild it ?

Would be interesting to see, if the output coil,
where the LED is connected to, if it had more windings, would
also put out more energy in this spike which recharges the capacitor...

EM, what if you change the 1.5 uF cap to 100nF or lower capacitance and so reduce
the losses and might speed up the frequency ?

[wattsup]

@All

Geez, this will be my very first circuit I ever build. I feel like American Idol?s William Hung. Hey "No formal training".

Almost all together. Bought the wrong led. The one shown needs at least 8.5 volts. I guess it should light at around 1 volt. Is it possible to light at less?

On the board I am showing one of many little ready made transformer gadgets that I already had. The blank ferrite core comes from one of these ready made ones. Unwinding those wires are dangerous for your eyes and fingers.

Now the windings are confusing me because the diagram shows three coils, but the photo shows 4 and EM's instructions talk of four. So I am lost at this point and need some clarification. If there are two coils and one trigger, what are the turns?

I also added an enlargement of EM's circuit.

[hartiberlin]

Hi Wattsup,
good to see you working on it.

What kind of LED doyou have ?

Just a normal 5 mm or 3 mm will do, which usually have a treshold voltageof around 2.5 to 2.7 Volts,
before they light up.Some might even need around 3 Volts.

And  EMdevices posted his coil specs already, so I quote:
===========================


Component Values:

In the 2.5 hour configuration, I used,    R = 1 Mohm and C = 1.5 uF
The main electolitic is 1000 uF.

Number of turns:
   15 for Recapture coil,
   30 for Colector coil (2 coils of 15 turns each),
   7   for Trigger coil

===========================================

So he is using for the collector coil 2 coils in series of each 15 turns giving 30 turns.

I guess for the basic oscillation effect you could play with the number of turns
a bit to get it into oscillation.

The question still is, what the best turn ratios are for this selfrunning
operation..?

[Calibrator]

Excellent job EM...
I have a question for you...what would happen if you added a second control coil in phase with the first control coil
and located on the opposite side (180 degrees)?

Cheers

Calibrator

[duff]

@EM

I successfully replicated your circuit today.

I'm getting 14 minutes run time which is probably due to a difference in our core material. Used a mps8099, hfe 154. I tried replacing the led with a germanium diode but it didn't make a significant difference.

Neat circuit - certainly merits further experimenting.


-Duff