These tubes draw quite a lot of power. I've only worked on the IN-9, and I recall it needed close to 20mA to get a full glow, so 1-2 watts is the right ballpark. R1 & R2 will be around 100mW worst-case, so 0805 should work.
SMT resistors put a lot more of their heat onto the PCB than a traditional thru-hole resistor because of direct contact , so be sure to measure the temperature carefully. Most PCBs (FR-4) have a glass-transition temp around 130 degrees C, so you want to be well below that for reliability. On Monday, May 6, 2024 at 4:09:31 PM UTC-7 Zachary wrote: > [image: IN13.PNG] > > Hi, does anyone know what are the minimum required specifications of the > resistors R3 and R4 for this IN-13 driver circuit? The voltage rating > obviously needs to be >150V but what about the power rating? 2W and 1W seem > very high. I'm trying to make small PCB sockets with only SMD components > but potentiometers above 0.5W are very big. > -- 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 view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/27ff822b-be5a-4a0b-9962-b289fee511d5n%40googlegroups.com.
