Mysterious Resonant Circuit

[MACEDONIA CD]

hi all

   @EM    WAY YOU DONT  TRAING TO PUT   LETS  SAY  INPUT  <3 >  9 VOLTS BATERY IN SERIAL  AND  SEE  THEN   WHAT WHILL BE   MYBE YOU  ARE NEED MORE VOLTAGE  TO
ACTIVATE  THIS  PUSH PULL CIRCUITS  WHIT MORE VOLTAGE 
MAYBE   THEN   THE   SMALL  NPN TRASISTOR  WHILL WORK  BETER 
  I SAID BEACOUSE   THE NPN OSCILATOR TRASISTORS  WORK  PROPERTLY OF LITLE HIGH VOLTAG  \
 
   MAST IF YOU INCREASE THE VOLTAGE  YOU MAST  SMALL YOU TURNS OF  FEED BACK   THAT COIL  HO GOING TO   BASE  OF TRANSISTOR 
IF YOU DONT   THEN  YOU WHILL GET  BURST  THE TRANS.

[khabe]

hi Apostle Macedonia,
You promised long time ago to tell as how it works the SM TPU - where it is?
khabe

[gyulasun]

@xee

Not a problem -

Actually you guys have helped a lot - Thanks!


-Duff

@ Duff, you are welcome.

@ Xee,  thanks for chiming in with the explanation, you nicely explained Duff's question for me.
I also agree with your schematics on looping back the output power to replace the battery.  I would certainly include a voltage stabilizer in the loop so that no any runaway situation could occur when someone closes the switch into the Run position (in your schematics, Reply # 139).  I know that the use of any regulator involves power loss so it should be applied with caution. I mentioned LM317 linear regulator for EMDevices as a simple adjustable solution but many other regulators are available for this task.

Thanks, Gyula

[xee]

@ gyulasun 

I think EMDevices knows what he is doing. The schematic was just a place to start with the intent that he would mark it up with his corrections. If it runs away I do not think he will be too unhappy because that can be easily fixed. I am concerned about changing the load on the coil winding from 150 ohms to an RF short through the capacitor. A good next step would probably be to try to increase the COP but I suspected that he would want to try using what he already had. I am just trying to help out as best I can and it seemed like he was doing the schematics the hard way and might want some help.

[Vortex1]

Since heat rise is a good relative indication of power level, I have run some temperature rise tests on a 1/2 watt 150 Ohm (approximate)  carbon resistor using two tiny thermocouples, one taped to the resistor, the other sensing ambient 77 F  (which did not move during the test)

The resistor was a 1/2 watt carbon film from Piher, start cold value 149.8

The resistor was fed from a HP 6181c Variable Current source

Voltage across the resistor was measured with a Fluke87

Temperatures were measured with a Fluke 52 Dual Thermocouple meter.

mA          Volts          Power  W        Temp
25            3.73              0.0933             92.0
50            7.41              0.371               131.2
75            11.02            0.826               190.0
100          14.58           1.46                  266.2
125          17.88           2.23                  350.6
150           21.1             3.16                  435.8

The resistor changed value a bit during the test from the heat. Final cold value was149.6

I built up the mystery coil and got the identical waveform as EM. The same resistor was used with T/C and temperature never exceeded 190 F putting the power at roughly 0.83 Watts. I even tried tuning the resonant cap.

Power input to the circuit was about 20% higher. Unless you have true RMS computation within your scope, you cannot use the peak to peak voltage in a power formula because of the odd waveshape.

attached is the pdf if values get scrambled during post

.........V