>Regarding isolation, some circuits are easier to build if the different high voltages needed are isolated from the low voltages (digital and/or analogue) and in the case with Russian Dekatrons like A-201 (Polyatron) it is a lot easier to design a circuit with isolated power supplies than those that use a common ground.
Got it... It should be possible to get any isolated voltage or set of voltages by using a secondary that is ratio metrically related to a sensed output winding. For a variable input voltage a grounded secondary (vs a tapped winding) is needed or else the output will vary as the input changes unless you subtract the input voltage from the feedback equation. For instance, to get 600V on an isolated winding you can develop 200V across a 60 turn secondary that is fed back to the controller and then use a floating 180 turn secondary to generate the 600V output. As long as there is minimal loading on both windings, line and load regulation is actually pretty good. This is used in a lot of newer AC adapters to get rid of the optocoupler by simply measuring the voltage on the primary during flyback to get a sense of the secondary voltage. I'll give that a try when my boards come in next week. jt -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/8d059f2c-b306-4583-b7cc-6dd2db078cb5%40googlegroups.com?hl=en-GB. For more options, visit https://groups.google.com/groups/opt_out.
