Re: HT for a car radio
Once you use transistors as the switching elements, you aren't tied to 50Hz transformers. You're free to go higher in frequency, which will make things a lot smaller, lighter and easier to package. The numbers of turns in your windings scale down significantly, too.
One thing is to avoid the Royer self-oscillating type and have a separate driver and oscillator operating the power transistors. ~this avoids a few pitfalls.
No designs in my head at the moment, but there are lots around. some done for the vslve era amateur radio projects in RSGB publications. Also an inverter for any DC voltage can be changed by just redoing the turns for the secondary to make whatever voltage you want.
Have a look for applications notes by Silicon General, Linear Technology inc, Texas instruments, International rectifier.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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