Lords of the Ring

[Rosphere]

I found an, "INPUT:AC120V 60Hz 8.5W, OUTPUT:DC12V 400mA," black-box converter that I measure at 18.4 volts.

Jason,

I used the above power source to fire up your circuit using an IRF520, that coil recycled from my failed TPU_01, and two identical ceramic caps from THAT MONITOR I SMASH LONG AGO, (reddish-brown, rectangular 1"x3/8", with markings: "282J, 1600V, SMPAf.")

I am not routing anything through the core of my coil, yet.  I am following your latest schematic connectivity.  My scope probe leads are across the power supply.

When I fire it up my scope shows flat line DC at nearly 20 volts, (as per above.)

Then I short the gate to +20V for only one quick tap... POP... I see a sine wave appear and stay on my scope from about +3 to +7 volts at about 47Hz.  (I would need to clear an error rate of 28% to be seeing 60Hz, close though.)  Then my coil heats up fast.  The MOSFET stays cool.

When I remove the coil-cap I get similar results, (need to measure,) but my MOSFET heats up fast while my coil stays cool.  Strange, it seems that I am moving the heat around in my circuit.

These are early results.  I also noticed that I can disconnect and reconnect the power and the sine wave will still be on my screen, unless I short out the 'fet-cap.  If I do this then I need to tap the gate to + again.  My multimeter showed 33 mV oscillations in the 'fet-cap when my power was unplugged.  I should have used my scope to look at this.  I still can.  I need to get away from my keyboard now and get back to the lab!

Rosphere Team!

[Dansway]

@Jason,

My newest test coil as promised.

@Rosphere,

Can you supply pics of your set up etc?

Regards,

~Dan

[innovation_station]

i do not yet have a scope but i think i will be building few diffrent versions of the tup and displaying some pictures of them  also if i keep thinking on this i might just be able to make it work with out the use of a scope but i think it will take a bit of playing around to find the proper freq's


@ dan i like your coils they look cool! i can just imaine the time involved

[Rosphere]

When I route the coil back through the core, through a bulb, and then to the +side, (removing the coil cap,) the following happens:  I tap the gate to the -side, still nothing.  I tap the gate to the +side and POP goes the light bulb, (it goes on.)  The coil stays cool.  The 'fet stays cool. The heat goes to the bulb.

I found another anomaly.  It still works when I yank out the other 'fet-cap.    It even starts up without it.  I have a longish wire connected to the fet gate.  When I tap it to the ground, the bulb goes off and there is no oscillation in the circuit.   When I tap it to the +side it starts to oscillate with a balanced sine/triangle shaped wave.  When I tap the exposed coil core end the sine/triangle wave is lopsided with every other wave about 10%-20% smaller.  This, again, with no caps.

I would post a photo but I am using nothing new here.  The schematic is Jason's and my parts are already shown in photos in the last few pages here.  Right now it looks like a pile of spaghetti anyway. 

EDIT ONE: Spaghetti picture posted anyway.

EDIT TWO: Note: Scope voltage range across source is sine/triangular from 14.5V to 15.5V.   

[Dansway]

@IS

Thanks for the compliment.  These little coils take a lot of time to build...

@Rosphere,

Thansk for sharing your test results and any findings you have.

Regards,

~Dan