The B8422 Nixie tubes were destined to end up in an alarm clock on my bedside cupboard. My house is slowly filling up with homemade clocks, only our bedroom has so far been saved from the `collateral damage` of my clock making mania. A set of romantically glowing nixie tubes will make a big improvement compared to the ordinary twenty year old
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LED alarm clock I use now. The B8422 is a lovely "top-view" Nixie tube with a very characteristic semi-rectangular (or semi-round) shape (Fig. 3). This peculiar shape makes it possible to make a row of closely spaced digits e. g. for a calculator read-out, which would have been impossible with a perfectly round top-view type like e. g. the B5031 or ZM1020 For years I have been playing around with the idea of making a talking clock. It seemed to me to be a nice idea to capture the voice of somebody who is special to me, so that I could hear the voice of that person telling the time, even when that person is not there (anymore). EPROMs now have such a large memory capacity that they can easily store a minute or so of audio with quite a reasonable quality. Instead of telling the time I decided to record and store a number of wake-up messages spoken by my sons (Geert 9 and Daan 6). As I am very fond on them, I though that I will wake up a lot more relaxed hearing their voices instead of an angry buzzer. For the case I want to use the other half of the Plexiglas tube I had left over from the "NIXIE I" clock. The somewhat limited space available in this tube more or less dictated the, at first sight, slightly strange distribution of the clock circuit over the three PCBs. At the writing of this page the final case of this clock was not yet finished. As always I find it the most difficult part of building a clock. When it is ready...
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.....
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