After building so many Nixie Tube Clocks from the Internet, I finally decided to design my own. My clock uses IN-12 Nixie Tubes and an 8-core Propeller Microcontroller. The Propeller may a be a bit of overkill for the task, but it`s the microcontroller that I`m most familiar with an is easy to program. A Dallas 1302 RTC chip is used for accurate t
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imekeeping. I had many choices of which Nixie Tubes to use, and I chose the IN-12 for several reasons. First of all, they`re very cheap. You can pick them up on ebay for around a buck a piece plus shipping. Second, they use pin sockets. I really hate having to solder tubes direct to the board, like in the IN-14s. Third, they`re a horizontal-facing tube as opposed to the upright tubes. I thought it would be fun to do some horizontal projects. This is the same PSU that I`ve used elsewhere on the web site for other projects (including my dekatron projects). It`s based ont he power supply used in tubehobby`s clock. The TL494 forms a straightforward switching power supply. It`s an easy to build supply, and is very stable and easy to trim for the correct voltage. Next up is the microcontroller: The microcontroller circuit is a very straightforward propeller design, if you`re familiar with the propeller. The 4-pin header is for in-circuit programming. The EEPROM is because the prop stores it`s program in external EEPROM rather than internally. The large header is for expansion. I put 10K pullup resistors on two of the pins on the expansion header in case I want to use them for buttons. Next let`s look at the low-voltage power supply and the DS1302: The power supply uses a pair of linear regulators. The first regulates down to 5V (for the K155D drivers) and the second regulates the 5V down to 3. 3V for the prop, eeprom, and dallas...
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....
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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....
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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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