IN-4 eagle template

[Mateusz Dziuba]

Hi! My name is Mateusz and I am trying to build nixie clock on 6 IN-4 lamps.

I based my design on https://www.instructables.com/id/simple-user-adjustable-DIY-Nixie-Clock/

I want to redesign front shield, but cannot find proper eagle template for IN-4 on internet. 

I download adafruit libraries with russian_tubes.lbr, but it seems they just link IN-18 template to it. I managed to change pins order as it is for IN-4, but I am still thinking, the pins positions are not correct.

Do You have NIXIE IN-4 eagle template? How You manage to design clocks with IN-4?

[Paul Andrews]

I uploaded a fix to my library (which is the one you mention below, but with other fixes too): https://github.com/judge2005/Eagle-and-KiCAD-Nixie-Libs/blob/master/nixies-us.lbr.

I haven't tried it, but you should be able to verify it.

[John Smout]

Firing up a NIMO tube on Youtube - Fran Blanche's Franlab:
https://youtu.be/xmWg7CtN0Ac

John S

[Mateusz Dziuba]

Thanks! I didn't make a PCB yet, but when comparing with IN-4 in hand, it seems the angles and distances are correct.

[John Smout]

Also don’t forget that there is an online Valve and Socket Calculator for Eagle on Nick’s website:

https://www.desmith.net/NMdS/Electronics/soculator.html

John S

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[threeneurons]

The IN-4 & IN-18 can be used in the same socket. Physical pin spacing is the same (14-pins, on a 18mm diameter pin circle, 24.5 degrees apart). Pin-out assignments is different, between the two.

Pin #  IN-4  IN-18

==== ==== ====

. 1 . . . K4 . . N/C

. 2 . . . K6 . . K4

. 3 . . . K8 . . K5

. 4 . . .SCR* Anode

. 5 . . . K9 . . K6

. 6 . . . K7 . . K7

. 7 . . . N/C . K3

. 8 . . . K0 . . N/C

. 9 . . . K2 . . K8

.10. . . A2* . K2

.11. . . K3 . . K1

.12. . . K5 . . Anode

.13. . . A1*. . K0

.14. . . K1 . . N/C

*the IN-4 has two different configurations. One has two anodes (A1 & A2), and separating screen, allowing it to be operated as a bi-quinary nixie, in addition to a "traditional" nixie. The other configuration omits the screen and an anode. It only has one (A1), and can only be operated in the traditional mode.

I just plugged an IN-4 tube into a IN-18 socket, and it fits without issue. So this is NOT a guess, but CONFIRMED.

Though, I would suggest against the IN-4 for a nixie clock, as it does not contain mercury, and therefore has a short life. I found that out the hard way. My first nixie clock used two IN-4s paired with two ZM1032 (biquinary) nixies:

First photo

The 8051 uC drove all 4 as a multiplexed biquinary group. 2x4=8 anode drives, and 5-cathode pairs. 8x5. More complicated than it needed to be if I just used regular nixies. Biquinary only has an advantage when run by descrete circuitry. ICs made them obsolete.

Well the short life of the IN-4, caused the zero to disappear in less than a year. Mercury is a good thing in nixies (IN-8-2, IN-12, IN-14, IN-16, IN-17, & IN-18).