It looks like you just pick an R1 and solve for R2. If you pick R1 at 10K, then R2 == 2 megohms.
300/1.5= 200. 200-1 = 199 10000*199 = 1990000 R2 = 1990000 or 2 megohms. Terry On Wednesday, July 12, 2017 at 2:02:31 PM UTC-5, Jack Lynch wrote: > > Hi! > > I would like to adapt the design found here > <http://www.desmith.net/NMdS/Electronics/NixiePSU.html> for a variable > 300V max output, instead of around 180–220V: > > > <https://lh3.googleusercontent.com/-s-0Y3HUtvnQ/WWZxbEdcAtI/AAAAAAAABl8/kj1ECWl4iR0tEYFTyzObW48sHwiO4erSACLcBGAs/s1600/Screen%2BShot%2B2017-07-12%2Bat%2B2.59.12%2BPM.png> > > > I understand that the output voltage is adjusted by the resistors R1 and > R2, per the MAX1771 datasheet > <https://datasheets.maximintegrated.com/en/ds/MAX1771.pdf>: > > > <https://lh3.googleusercontent.com/-dpjgDtRGWhg/WWZxvx4w4II/AAAAAAAABmA/GhOM6eWGUVg-WVsYlIytvXjMQjOpjOolQCLcBGAs/s1600/Screen%2BShot%2B2017-07-12%2Bat%2B2.59.00%2BPM.png> > > > and that in this case a potentiometer is used to vary the voltage of R1. > However, I'm not sure how the above equations are used to arrive at the > voltage bounds specified in the schematic. Could someone explain? Using > those equations, what value of R2 should I substitute in for the one used > in the schematic to arrive at my desired maximum voltage of 300V? > > Thanks! > -- 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/4d9a1a78-10af-4413-b023-d9e51d60238f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
