Hey people!
Thanks for your replies!! Maybe I can explain the situation a bit more.
I am designing a computer controlled tester for triode tubes. I currently designed circuits for gm, emission, µ, etc.. and currently working on a circuit for cathode-heater leakage detection. I pretty much have all the low voltage stuff covered: opamp supplies, programmable bias, programmable heater supply etc..
Now the challenge is making a supply that can deliver about 50mA max at 250V/200V/180V/130V/90V for all these tests. I am using only ONE of these voltages at the same time. The tester itself is filled with modern solid state components, my goal is not to make an 'old school' tester.. Also if possible, I would like to make the design as cheap as possible..
I have considered ordering 5 kilometers of copper wire to try to make a transformer with these voltages myself, but I would like to do this only if nothing else can do the trick.
If the supply circuit has many outputs, I will need to build a switching mechanism, which is an extra cost. So if the supply circuit only has one output, the circuit can be a bit more expensive because of the savings on the switching circuit.
About the flyback converter: that looks like a neat circuit! Thanks! I am just wondering if it wouldn't be better in my case to start with a high voltage transformer?
I hope this all makes sense to you.. I have fairly little experience.. (Only designed and built one guitar amplifier before
)
By the way, I am in continental Europe, so I get 230Vac from the plug..
If you would like more information, or if you're just interested in my project, just ask!!
With kind regards,
Lebowski