IN-18 and PIRs

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3 years 8 months ago #9356 by Torsten Lang
Replied by Torsten Lang on topic IN-18 and PIRs
Underdeisgning can fire back after some time as in the "Blue Dream". Dieter designed the power supply to deliver 170V which would be OK for the Nixies, the problem is that he connected the Neon lamps used in the colon indicators in series. The Neons have a striking voltage of up to 90V and it happens what one would expect: When the tubes are new they will work, but after 6..12 months of use when the striking voltage increases the Neons start failing. I now have the second set of failed Neons in the Blue Dream.

The 170V power supply is designed so that there is no buffer to increase the voltage...

Regards,
Torsten

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