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Resonance WFC measurements

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webmug:
Hi,

Need help!

Did someone test the driver circuit properly?

I can't get it to work, no signal at Pin#7 ???
With the resistor values from Dynodon I can not get it to work.

Br,
Webmug

webmug:
Tonywoodside replication PCB

Webmug replication

As we can see the duty cycle to the TIP120 transistor is not 50%, this happens when the transistors in the driver circuit are not properly biased!
Also the pickup from the TIP120 signal has not 50% duty cycle.

The output from the PLL has 50% duty cycle.

I used the variable resistor values to get the same output as Tonywoodside. The values from Dynodon didn't work at all.

Any ideas what resistor values are needed? The current going into the primary coil should be high for the type of wire used (30AWG).
So the TIP120 is biased.
Stan used a 2N2222 (Ic 800 mA) and two 2N3906 (Ic 200 mA) transistors. The 4046 PLL is powered by 12V and pulsing at the resistor input network to the base of the 2N3906 (emitter 12V) etc.

Br,
Webmug

webmug:
Hi,

Finally I measured all my coils and WFC with different types of water in it.
Took me a lot of time to do all the measurements!!!

I hope I see more measurements from other members...

Note: See attachment for details !!!

Br,
Webmug

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