Folks, you can find the schematic for the clock on Pete's website under the kit instructions for Frank 3 clock ( http://www.pvelectronics.co.uk/index.php?main_page=page_2&zenid=20158eaf309af0e37312e9962a16f589). The mosfet does get warm on this but I've never had an issue with any of these clocks for several years. I did have one IRFD220 on a larger tube clock fry on me but that's because I was driving the HV too hard at 185V. You can replace it with an IRF640 or similar I believe if you want to heatsink it (I'd check with Pete on this one beforehand...he's very helpful!) but I don't think that's necessary...
Nick On Thu, Sep 29, 2016 at 7:00 AM, gregebert <[email protected]> wrote: > I'd choose a device designed for higher power dissipation and that can > accommodate a heatsink, such as a TO-220. Be sure your replacement device > has a similar or slightly lower Vgs (on), and a lower Rds. I don know what > the DC-DC converter design looks like, so make sure Vds is greater than the > output voltage, probably 200V min. > > The device you have now will only have marginal improvement with a > heatsink because it's package was not optimized to use a heatsink. There > isn't enough info in the datasheet to calculate the thermals with a > heatsink. > > -- > 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 email to [email protected]. > To view this discussion on the web, visit https://groups.google.com/d/ > msgid/neonixie-l/87f146d0-07dc-4dea-88aa-620eed0527b1%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/87f146d0-07dc-4dea-88aa-620eed0527b1%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- 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/CAOX%2BRHJe1v_0GhX735rfWDt_8WvHXcR9OvwR7p2bCA-%2B1bpSMA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
