Dr Ronald Stiffler SEC technology

[erfandl]

How much volts do you use
where is the 1000 uH coil
and for what you use 1 K ohm resistor

I use 12 volt. below schematic use 1 kohm resistor

[Ed morbus]

Watch Lidmotor on youtube lidmotor use 1000 uH to make it working

[AlienGrey]

Erfandi

Hi looking at your coil i must say it looks like a low frequency Tesla coil, you mention it is from an audible Tesla application.
I think the reason you might be getting nothing is because the coils natural frequency is cutting off in the audio range,
if you used a SG and a scope you would be able to see this phenomena on the scope screen, can I suggest you re wind it
as per L3 characteristics.

Hope this helps.

AG

[erfandl]

Erfandi

Hi looking at your coil i must say it looks like a low frequency Tesla coil, you mention it is from an audible Tesla application.
I think the reason you might be getting nothing is because the coils natural frequency is cutting off in the audio range,
if you used a SG and a scope you would be able to see this phenomena on the scope screen, can I suggest you re wind it
as per L3 characteristics.

Hope this helps.

AG

thanks for reply. ok I want to make my own L3 coil how many turn is good ? 80 ?
thanks

[gyulasun]

Hi erfandl

Please remove the crystal, connect the 12V supply and measure DC voltage with a voltmeter
between negative supply and transistor base and
between negative supply and transistor collector.

Then plug in the crystal and check again the above voltages. Also, switch voltmeter to AC mode
and check the above voltages whether it indicates anything. If it displays total zero in AC mode, then
the crystal may be faulty.  Of course an oscilloscope set to DC coupled input would be the best to check
the voltages, if you have one.
With the DC voltages you find we can decide more.

Yes, the coil may have a much different self resonant frequency than 13.56 MHz and by the look of the coil it may have a self resonant frequency already below 13.56 MHz.  But this must come later, first thing is to check theoscillator works or not.   The use of a choke coil in the collector instead of 1 kOhm may also help crystal oscillation  if the crystal is not that active.

Gyula