simple solid state ultra high frequency tesla coil driver 1

381

06:38:41

The signal source is a VCO that can go from 250 -400 MH.  See the POS-500W+ from MiniCrcuits.com.  The MOSFET  is RD15HVF1 from  Mitsubishi, which is capable of operating in this range:
High power and High Gain:
Pout>15W, Gp>14dB @Vdd=12.5V,f=175MHz Pout>15W, Gp>7dB @Vdd=12.5V,f=520MHz
High Efficiency: 60%typ. on VHF Band High Efficiency: 55%typ. on UHF Band

The hard part is the winding the coils, they are very small and small number of turns.  I am even thinking of using a copper core (like 18 guage wire)  to REDUCE the inductance, but not sure what it will do to reactance.

Richie Burnett was able to make a 4MHz solid state TC: http://www.richieburnett.co.uk/hfsstc.html

My target is 300Mhz for material morphology studies

published 8 years ago

SigmaEOD

8 years ago

300MHz is quite the frequency. The MOSFET would not be able to handle that speed in real life. I've only seen SSTCs go at 12MHz max.

SigmaEOD

8 years ago

Most SSTCs operate at around 250kHz to 1MHz

SigmaEOD

8 years ago

In a lot of other SSTCs, people use the 555 Timer to set their frequency

nikisalli

8 years ago

A my friend made a big sstc and it works at 120khz

nikisalli

8 years ago

My new tesla coil works at 576khz and is 14cm*7cm with 0.165mm wire and makes 5cm sparks with an interrupted slayer exciter :-)

cpaltenghe

8 years ago

Please see my updated description and comment

SigmaEOD

8 years ago

Have you done the calculations for the winding of the coil. I would really like to see that xD

cpaltenghe

8 years ago

Secondary Coil 50nH Coil diameter .0403 (18 awg wire as core) Wire diameter .0403 Length 2.01 inches Turns 50 Primary coil 50nH Coil diameter .1406 ( 9/64 drill as core, removed after winding) Wire diameter .0403 Length .21 inches Turns 5.2 Roughly 1:10

cpaltenghe

8 years ago

I have no equipment to measure these small values. Does anyone know how Tesla did his tuning with out equipment like we have today?

SigmaEOD

8 years ago

I'm glad you did them. But I'm more worried about the possibility of them catching on fire xD

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