A standard 12-volt auto electrical system can be considered to be a powerful but unreliable source of low-voltage DC current. Some of the features any mobile PC installation should provide include: Automotive systems must be designed to strict electrical standards. Your car`s starter motor, along with many of its accessories, are high-current loads that are inductive in nature. Cranking and accessory
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operation can induce large spikes that can upset or destroy any sensitive equipment left unprotected. Newer cars with lots of engine control and diagnostic hardware are much better-behaved than older cars in EMI/RFI terms, but it still makes sense to anticipate the worst in your power-supply design. For most of us, that means using an off-the-shelf power supply solution, rather than rolling our own from scratch. Either an inexpensive 300-watt inverter or commercial 12-volt ATX supply should address these concerns. It`s possible to turn your mobile PC on and off manually with a conventional power switch, but that`s not what you want. Your stereo doesn`t work this way - it comes on when you turn the key, and shuts off when you kill the ignition. You want your computer to do the same. Unfortunately, unlike the older AT-style PC motherboards, many newer ATX-style boards don`t turn on automatically upon application of power. (Check your CMOS setup options - some BIOS versions do support this. ) An ATX power switch can`t be simply hard-wired to the "on" position; the motherboard requires a momentary-contact pulse to turn the system on, so some additional circuitry is likely to be necessary. Almost without exception, the first car CD players on the market had a very annoying drawback compared to the cassette-tape players they were hoping to replace. Every time you started your car, your CD would restart play from the beginning of...
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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