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Old 18th Jul 2006, 8:38 pm   #17
adibrook
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Join Date: Dec 2004
Location: Weymouth, Dorset, UK.
Posts: 377
Default Re: should this work?

Ok...now i think i got a workign circuit.

http://img.photobucket.com/albums/v4...pentagrid1.gif

I found out that for some reason this particular circuit doesnt like to have much resistance between the virtual anode 2nd and 4th grid thing and ht. When i turn the 50k pot up past about 5-7k the oscillations stop.

However, now that i have a coil instead of a resistance on the anode, it seems to actually use the anode!

The coil is a home made one wound on a piece of pipe.

When i connected a scope to the secondery, i could see a 3mV p-p sine. i'm not sure weatehr thas good or bad...i mean..the signal is present..and it's a clean sine, but 3mV isnt alot. Perhaps i need to wind another coil with 200 turns on both pri and sec.

BTW i'm running it on 150v..the 250 is a typo.
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