Mysterious Resonant Circuit

[gyulasun]

Ok i have taken all the scope shots of my setup, can someone explain how i post 4 scope shots and a picture of my setup

Thanks
Peter

Hi Peter,

If the size of your photos are less than 100kB each then you can simply attach to your next post at Attach  by clicking on Browsing or on (more attachments),  you should see this just under your text window that opens when you press the Reply button.
If you have higher than 100KB picture files then you may upload them here:
http://www.overunity.com/index.php?action=tpmod;dl=upload  max 5MB files each and you can see them by clicking on the Forum Download icon (top left side Column)

Gyula

[Yucca]

Ok i have taken all the scope shots of my setup, can someone explain how i post 4 scope shots and a picture of my setup

Thanks
Peter

Hi Peter,

This should work:

make each photo less than 100kb by saving each pic as JPG (you may have to reduce size and save until you get the size down.)

then press the insert image button in the post composer of this forum, the insert image button is 1 in from the left on the bottom row, it's got a small photograph on the button.

Fraser.

edit: LOL , Gyula beat me to it

[Peterae]

In Honour of EMDevices i give my first test results.

I am strugling with noise on my psu still, trying to clear it totaly effects the output amplitude.

I am using a 2n2219A

My Cap on the base is 470pf

My Cap across the coil winding is 22pf

My circuit is setup as per EM's first diagram, my scope shots are also taken from the same positioons

I use a NiCad Bank which at the time of the test was 12.6Volts

The current drawn from the NiCad psu was measured to be 118mA i measured this 1 with a DVM and 2 with a moving iron coil meter.

I have not had time to crunch the numbers maybe someone could help here.

Scope shot 1 is taken on the collector i have 54V PK-PK, Cyc RMS = 17.55Volts

Scope shot 2 is taken across the base 2.1V PK-PK. Cyc RMS = 520 mVolts

Scope shot 3 is taken across a 150 Ohm Load Resistor, 47 V PK-Pk, Cyc RMS = 15.55 V, i had to make this up using 9 150 Ohm Resistors to increase the wattage(3 x 150R in parralel with 3 of these in series), i measured the resistance to confirm it was 149.3Ohms.

Scope shot 4 is taken across the battery unfortunatley it was 1.72V PK-Pk so i need to do some work on this.

Picture 5 is my setup

Peter
**** Ive just spotted a mistake on scope shot 2 when i grabbed the shot, so take no notice of what the scope says the PK-PK is it is showing Chan A info instead of Chan B, the waveform is correct but is 2.1V PK-PK, Cyc RMS 520mV

Thanks Gyulasun and Yucca, shows how often i post LOL

[aleks]

Scope shot 4 is taken across the battery unfortunatley it was 1.72V PK-Pk so i need to do some work on this.

So, after filtering it out it will turn into something like 1V DC? In that case you have even better COP than EM.

[gyulasun]

Peter,

Your measurements give also a COP of about 1.25 so CONGRATULATIONS to you too!!!

your input power is 12.6V x 0.118A = 1.4868W

your output power across the 149.3 Ohm load is (16.72 x 16.72) / 149.3 = 1.8724W  (I took 16.72 by dividing your peak to peak voltage of 47V by 2.82 to get its true RMS value, your scope give a bit better value for this as 17.55V)

your COP is 1.8724 / 1.4868 = 1.25

Of course you need further "cleaning" across the battery like EMdevices just showed on his modified schematics.

Also, try to connect the battery lead to members of your battery bank lower in voltage to be able to reduce supply voltage to find 'sweeter working point' .

rgds,  Gyula