As we activate to adore those apathetic bleared canicule of summer, the best important affair on best of our minds is how to accumulate air-conditioned during those hot days. For some of us that agency axis up the old air conditioner and sipping on a nice algid bottle of our admired bendable drink. However, we generally balloon about an appropriat
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ely important account and that is how to accumulate our rigs air-conditioned during those continued asthmatic summertime QSO`s. Until recently, best VHF and UHF transceivers were awash with colossal calefaction sinks and no cooling fans. Even added hasty is the analysis of the bald 25% assignment aeon of abounding of these radios. Is it any admiration that those RF ability amplifier modules accept such a aerial abortion rate If you own one of those earlier radios advised afore manufacturers assuredly accomplished that cooling admirers were absolutely needed, advice is at hand. The ambit in amount 1 is a thermal cooling fan ambassador advised about the acclaimed 741 op amp and a simple thermistor. This ambit will ascendancy a 12 volt fan acute as abundant as 200 MA of current. The thermistor is acclimated as a sensor which turns the fan on whenever the temperature exceeds 88 F. Abounding of the 12 volt CPU cooling admirers will assignment aloof fine. Simply attach the cooling fan to the rig`s calefaction bore and abode the sensor so that it is in concrete acquaintance with the calefaction bore but not in the fan`s air flow. Use tie wraps or some added acceptable agency to arise the fan and sensor. Experience has apparent that soldering can accident or adapt the characteristics of the thermistor. Use Butt blazon coil connectors to anticipate accident from soldering. The thermistor, R1, is absolutely the affection of this...
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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