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NPN transistor SSTC circuit

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LAN_403

Mates

Wed Nov 14 2007, 11:50AM

Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566

Hi guys,
I have at least 15 HV NPN transistors of different sizes from old monitors at home without any practical use. Recently I run into this circuit involving a use of HV NPN transistor for SSTC. Iâ€™d like to know your opinion; the guy on the web page (sorry it is in Czech) built this system which worked fine till 40V than he experienced transistor death(B-E breakdown, B-C cutoff). Dou you think this scheme could be remade for higher voltages involving TVS?
Iâ€™d like to disscus thisâ€¦

Thanks...

BTW: Z in the scheme means turns...

here is the web page

Dr. Dark Current

Wed Nov 14 2007, 02:16PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

This circuit has no meaning nowadays. The output is poor and efficiency too (horizontal output transistor are useless for anything >50khz). If you use MOSFET bridge (with the fets you get for the same price as the HOT), you can multiply the output spark size several times.

BTW here is a link to English version of the page:

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