> Wonderful reply. I really appreciate the link and the explanation. > I now understand why Michael mentioned his method uses simple parts, In > comparison to JT HVPS - I haven't a clue where I can source 4700pf 3kv > ceramic capacitors hah!
I get things like that from old television sets, computer monitors, and bug zappers. Or you can buy 'em from Digikey/Mouser/Newark or various surplus outfits (Electronics Goldmine often has high voltage capacitors), for example: http://www.digikey.com/product-detail/en/S472M69Z5UR63L0R/1290PH-ND/2356826 ($3.78 for ten) > Is that last 3kv ceramic to smooth things out? Looks that way. > In some respects the 4093 derived pulse and cheap parts almost beats playing > with slightly harder to find parts using the AC pulse, And trying to solder > to the tiny foot print of the HVPS.... Rather interesting. It is easier to just use the built-in connector on the HVPS instead of tacking wires to it. Like many of these things, it depends on what's important to you. > Is the inductor choice critical in terms of current or would a simple axial > lead inductor work? The current is tiny, and the waveshaping function is non-critical, so an ordinary axial lead inductor should be fine. > Does one adjust the voltage resistor to get 200V DC output from the HVPS and > then add the 100Kohm preload or what is meant by preload? The HVPS has trouble staying regulated without a load on its usual DC output - that's what the 100KΩ resistor is for - just to provide a minimal load. Attach it first, then adjust for 200V (for Vadjust to ground, this works out to around 470Ω). > Would 1N49378 diode suffice? Yeah, a 1N4937 should be fine. I just buy UF4007 diodes in bulk (100 for $17) and use 'em for everything. > "For doubler DNI C3 and bypass CR3" - Is that electrical engineer terms for > omit C3 and CR3(Diode)? lol Yeah, DNI means "do not install", and "bypass" (in this context) means "replace with short circuit". > As for AC out routing comment, How far did he anticipate a person should or > would place their connections in relation to the HVPS it self? Since it's a high frequency, high voltage signal, it's going to suffer capacitive and possibly corona loss fairly easily, so it would be best to keep such wires short. His routing comment refers to the fact that the high voltage AC output can couple back into the power supply's feedback circuitry and cause trouble - so the wire from the AC output should be routed away from the board. > More questions then I came in with originally, Always some thing new! Questions and answers are how we all learn (both the people asking them and the people answering them). Bring 'em on! - John -- 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/A16FBF23-AB74-4026-B12C-BC3DC146DF47%40mac.com. For more options, visit https://groups.google.com/groups/opt_out.
