This is a mini strobe light. NE555 is used as a self oscillator. The width of output pulse is changed by the variable resister. 25msec means 40Hz. 6m sec means 166Hz. A LED is connected on the output of this oscillator. Therefore LED twinkles from 40Hz to 166Hz. I lighted a speaker by this twinkle LED. The cone of a speaker is vibrated by 50Hz with 3V-AC power transformer. I adjusted the VR to oscillate 51Hz. Then, I can watch the corn of the speaker vibrates slowly with 1Hz. A strobe scope is used in order to research the vibration.
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This is very cheap one. If you are the teacher, you can teach the children that the sound is a vibration of the air. Also you can teach that the concept of phase and frequency with this equipment with this machine. If you are the young man, you can have a time with your girl friend in the dark room.( Last month I looked this light with 5 gentlemen. It was not enjoyable time HIHI) Description add on 10 Dec 2000: I forget to say about most important thing. Such a instrument can be uaed to evaluate the mechanical stability of the parts on the print boad.
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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