DC13.8V to DC250V Inverter Circuit Diagram
I have done a lot of work with valves in
recent years. For me valves have many advantages, least of all the
price; since they are now "obsolete" it is quite easy to get hold of
them for next to nothing at rally's and junk sales. I recently purchased
a couple of hundred battery valves for less than SEK1 (US$ 0.15) each.
The biggest problem with valves is the PSU needed to provide +250 vDC
and 6.3 vAC for the filaments. The transformers are no-longer available
at a reasonable price, but a pair of 12v-6v-0v-6v-12v mains transformers
will do the job just as well. For portable use only one transformer is
required together with a pair of power transistors such as 2N3055 etc.
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