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Feedback antenna sparking and 1N60 diode burn

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LAN_403

hsieh

Wed Jan 26 2011, 09:36AM

Registered Member #1412 Joined: Thu Mar 27 2008, 04:07PM
Location: Taipei Taiwan
Posts: 278

Sometimes I found my feedback antenna is sparking and when I use a higher input voltage (50V) today after a short run diode D2

burned and produced some orange light.Why?

And how can I tune class E SSTC?should I connect oscilloscope to my SSTC?Or just change diffrent caps trying to get longest spark?
My frequency is 450KHZ,what cap value should I try?
Thanks

axelro

Wed Jan 26 2011, 08:08PM

Registered Member #3640 Joined: Sat Jan 22 2011, 12:16PM
Location: Germany close to Heidelberg
Posts: 39

Are this germanium diodes? Then they probably are just a tick sensible - or your feedback antenna is too close. Try using 1N4148 or move to a bigger distance.

Real class E is not this simple - check either Steve Wards or Richie Burnett's web page, there are good examples and explanations. In particular see Steve's notes on coupling.

Gregory

Wed Jan 26 2011, 08:09PM

Registered Member #2922 Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226

To tune it you need an oscilloscope, and the capacitor need to be calculated using as reference your primary inductance. Read this to understand better what is and how works a Class E system:

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