>>Now that I have you here, can you answer me another question? I was wondering if the circuitry could be tweaked as to allow a maximum output voltage of 250V or even 300V. I will only need a maximum current of 10mA since I want to build a testing stand for single Nixie tubes.<<
If you replace the 30.1K Radj resistor on the module with a 15K resistor (Or put another 30K resistor in parallel) this will change the max feedback current from 165uA (Rbottom = 10K || 30.1K = 7.5K) to about 200uA (Rbottom = 10K || 15K = 6K) or Vmax goes from 200V to 250V. The main output capacitor is rated 250V and since it is a good quality part you should have no problem operating it at 250V. 300V is pushing it but for a test fixture you should be OK for short periods. To get 300V, replace the 30.1K resistor with 10K (Rbottom = 10K || 10K = 5K) to push the feedback current to 240uA. In all cases, the Radj=Open voltage will be about 150V. At 300V the output diode will be seeing about 420V (600V limit) for a 12V input and the main switch will be seeing about 42V (60V limit). At voltages above 200V both the transistor and diode will incur higher switching losses (The diode because of itself and the transistor because of the diode) so keep an eye on the dissipation of both those devices. -- 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/77d68cdc-96e5-4e2d-99bf-7049a850dabb%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
