Dr Ronald Stiffler SEC technology

[gyulasun]

What you ask from Lidmotor's drawing on the coil dimensions:
the first one is  5/8" =  0.625" = 15.8 mm        the outside diameter of the bobbin hence roughly the coil

the next one is 2 1/4" (two and a quarter) = 2.25"  = 57.1 mm    roughly  the length of the winding

the third one at the bottom you ask is the word 'shape'   i.e.  'AA battery' shape paper tube
Gyula

[itsu]

thanks. today I build the coil from lidmotor video. I buying a new 13.56 mhz crystal but yet the circuit cannot be working the ferite rod nothing doing when insert it in coil.

erlandl,

are you sure your bottom lead of the 100K resistor is attached to the base (middle) leg of the transistor?   
On the pictures it looks like its attached to the ground/emitter part of the circuit.


Itsu

[erfandl]

erlandl,

are you sure your bottom lead of the 100K resistor is attached to the base (middle) leg of the transistor?   
On the pictures it looks like its attached to the ground/emitter part of the circuit.


Itsu

yes that's connected to the base ( middle leg )

[erfandl]

Hi Erfandl,

Would like to ask what is your indicator for seeing whether the oscillator works or not, with this new coil?

Do you have an AV diode plug connected to the free end of the air coil and the diodes feed a LED?
You can use such "sniffer" AV plug holding in your hand like Slider shows in his above picture. It should indicate also at the collector in itself if you touch the common diodes point of the AV plug to the collector.
Gyula

thanks gyula. Im do it and LED is turning on. but cannot turning an 4 watt LED like lidmotor

[gyulasun]

Okay, very good.   Do you have to use the ferrite rod for fine tuning to get the brightness you show now?  Is this the maximum brightness you can get?  Try to use several such white LEDs in series too.