Following in the footsteps of the `primitive` but quite successful 4 pin OM802 timer IC manufactured by the original SIGNETICS ITT - GEMINI chip fabrication plants way back in 1969 / 1970, a new and very innovative I. C. known as the ` NE-555 ` timer I. C. was released to the market, being introduced around May 1971 by the then Signetics Corporation
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, later to be taken over by Philips Semiconductor, then more recently, NXP SEMICONDUCTOR, as a division of Philips. It then became commonly known as "triple-five", the NE-555 / SE-555 which we all know today as the "The Ubiquitous Timer chip" and it was also the very first mass-produced commercially produced timer IC available at that time. The design team could not have realised how sought after this chip was and I am sure many of you reading this will agree, it is without a doubt, the most useful " chip concept " that has endured the past almost two decades of consistent sales and what product shelf life it has had ! No one could have realised back in 1970, just how brilliantly successful it would be, lasting well over 25 years and manufactured by so many companies even today in May 1996and it is very much in demand by the " electronics Industry " today in August 2011, some 40 years later. While on the subject of MIL. SPEC. or Military Specification, it is generally not realised that Mil. Spec. chips are basically the same as any other chip, however their AQL or Acceptable Quality Level is tightened right down and the permissible errors in a sample 100% tested batch are virtually zero, that is to say, in say a batch of 100 chips, 99% passed with flying colours and 1% is a "bit suss" and pass all basic functionality tests however they do not meet the 100% AQL and therefore can be safely sold as garden variety commercial...
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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