Before Light-Emitting Diodes (LEDs) and Liquid Crystal Displays (LCDs) the electronic industry used cold-cathode tubes for displaying numbers, symbols and even characters. Even though they are called `tubes` they differ from `radio tubes` by having no heater wire to heat the cathode - and therefore run much colder. They do have a glass envelope bu
Click here to download the full size of the above Circuit.
t unlike to (most) tubes they are not empty: they are filled with a gas compound, mainly neon gas. If you apply a voltage between the anode (+ pole) and one of the cathodes (- poles) the character-shaped cathode is covered with a pink to orange discharge glow. "NIXIE" was a trademark from Burroughs Corp. for their numeric display tubes. It is rumoured that they invented this kind of tube - or at least they got patents for it. There were many different types of these tubes: viewed from the side, viewed from the top, small ones, big ones, giant sized, types where a neon glows through a character-shaped mask and arrays of multiple nixies with multiplexed wires. Even early "multi-segment" types were available, capable to display letters like the later LED 7-segment arrays. the voltage drops across the current-limiting resistor when one of the cathodes K0 - K9 is tied to GND. The corresponding number-shaped cathode is then covered with a pink to orange glow. The values for the minimum U Well. the professional approach is to have either a special transformer for the required voltages or at least an isolated 1:1 ratio separation transformer. If you live in the "low voltage" areas of the world where 110 VAC is the usual AC mains voltage you may survive a shock from the life wire. If you life in the "high voltage" areas like here in Germany the 230 VAC line voltage will surely kill you if you accidentially happen to be good...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: