Build A Nixie Tube Clock

J Aldridge writes: "People are still using Nixie tubes. Their warm glow seems to be the digital equivalent of the warm sound of vacuum amplifiers. One person has constructed a tube wristwatch."

Comments

Beware of following the instructions on this page

[Harumuka]

I, too, was tempted to buy a few Nixies to revive my cold and dank cellar, but stopped dead in my tracks soon as I saw a notice at the respectable RepairFAQ:

This circuit was not isolated from the power line and has been removed due to the danger involved in such a setup.

Although web archive's archives of the Repair FAQ only go back to 15 Feb 2K1, if I remember correctly the removed link went to the page Slashdot is linking too. Word from the wise: I'm not saying Nixies are inheirently dangerous, but many schmatics involving Nixie tubes do not isolate from the power line. And don't forget the big red warning on the page:

Warning! As this design uses a transformerless power supply, the whole circuit is at mains potential. Disconnect before making any adjustments etc. If you need to use an oscilloscope for debugging, the circuit MUST be operated through an isolating transformer.

Re:190 volts at...

[seanadams.com]

I seem to remember: 190 volts minimum at 3 to 5 milliamps. Discouraging if you want to use batteries.

Big whoop. It's not hard to make a switching power supply that will give you whatever voltage you want from a battery supply. Lots of sample circuits are out there.

You can also buy inexpensive inverter modules that make 100VAC from a battery supply - typically used for powering LCD electroluminescent backlights. Seach on digikey for "backlight inverter".