This 6` x 18` clock needs 52 light sources. It may one day allow humans to know the time without glasses. For 25 years we searched for clocks big enough to be see without glasses. No large clock existed commercially so our only resort was to have clocks everywhere in the dumpy apartment. Then one day, was looking for ways to see if c
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omponents were overheating without burning fingers. Commercial thermometers are too slow and expensive. Discovered a tiny thermister which could measure electronic parts quickly. With a microprocessor and a display this thermister could be a highly sensitive thermometer. A large clock wouldn`t be affordable if it couldn`t perform some other function, however. Using the thermometer as the clock`s second function would make it affordable. The thermoclock would need to run on 6V battery power or AC power with automatic battery recharging. Looking at $40 for this thermoclock. Most of the cost is in the LEDs and microprocessor. Got 2 of the world`s most expensive LEDs for testing. Radioshack charges $2 for a single LED which is only $0. 10 in Hong Kong. After several tests including shaving off the lenses, the best position had both LED`s facing each other and the lenses left intact. The key was figuring out how to permanently mount LEDs in that position. Discovered fiberglass is resistant enough to heat to be used as a soldering surface. Lacking the money to make a fiberglass sheet for the entire clock, cut out 27 small fiberglass pieces to mount LEDs on. Went through a few respirators grinding those out. So much dust is coating the apartment now that breathing is like falling in love with members. Unlike french fry grease or cigarette smoke, fiberglass dust doesn`t make you cough right away. You can breathe it for several...
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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