I need to power a 'scope project.
I have either 5v (preferably) or 12v source, and I need +12v, +300v, +400v, -200v, -300v and 6.3v (ac filament) voltages.
The high voltages are less than a mA, the 6.3 filament is around 3 watts.
Initially I'm thinking Tl494 (which needs >5v for its ref to work)...