Electronics Engineering

Somewhat oddly, and this also applies to another federally-monitored (Hobby) prospecting, there are no statutory age requirements. there have been ( most exceptionally) some adult-coached Hams as young as 8 in the fifties. There are different categories of exams for different classes of operators ( within the Ham envelope- this does not include C.B. ) some require code proficiency, some do not.

yes for the price the of them... it has a great 1080p picture and a great dazzling sound!

Conventional LEDs are cylindrical in shape with a diameter of 3, 5, 8 or 10mm. One end of the LED has two connecting wires and the other usually has a dome which acts as a lens for dispersion of light.

Surface mounting diodes (those without leads that solder directly on to the surface of a circuit board, are a variety of sizes and shapes. Typically, they have a light output on the top or on one side of the package. The size can be anywhere from 1mm square up to 10mm square.

The diode itself is tiny compared to the size of the complete package so the final shape can be designed to suit specific applications. In a component catalog, the LED section is frequently one of the largest, partly due to the huge range of package sizes and shapes.

No, SAW filters are completely passive devices. You cannot get gain from a SAW filter, and they obey the rules of reciprocity (i.e. S12 = S21).

Diodes cannot invert, a required part of the not operation.

it referred to the clock speed ,commercially this is widely used in defining clock speed of oscillators connected with processors for generating timing signals..

2.10ghz means 2.10*10^9 Hertz or this much signals per second

China ，but the Thinkpad series operations are purchased by Lenovo from IBM years ago.and the series are still designed now by the original team in USA seemingly.

Obviously,it depends on the situation.

consider a transistor amplifier.To minimize the change in collector current with respect to temperature,collector to base bias is used . This circuit uses a NEGATIVE FEEDBACK in order to compensate the rise in output current with temperature.

But in order to achieve maximum gain, the same circuit can use POSITIVE FEEDBACK by connecting the amplified output to the input .

The forward voltage of a semiconductor junction, silicon or germanium, changes by -2mV for every rise in temperature of 1 degree C, so your friend is correct

Circuits whose output is in the form of a wave. For instance, there are sine waves, square waves, triangle waves, and others.

You get a violent explosion as the diode vaporizes.

You need a regulator.

Originally such an amplifier did mathematical functions.

Yes magnets get weaker over time.

I cannot think of any, but a pn junction is a part of a diode and has a rectifying properties.

musical 3 pin IC UM66 and a popularly known Transistor BC548b

In creating hemodialysis dialyzers, either a countercurrent or cocurrent flow can be used between the unfiltered blood and the dialysate used to clean the blood. Using a differential material balance (fluid mechanics) on the fluid and solute entering and leaving the device, the molar flow rate of the blood into the dialysate can be calculated.

Without showing the math behind it, countercurrent flow if more efficient at cleaning the blood than cocurrent flow in a hemodialysis dialyzer. The reason for this is because the countercurrent flow allows the outlet concentration of the dialysate to exceed the outlet concentration of the blood, and approach the inlet concentration of the blood. With cocurrent flow, the exit concentration of the dialysate is slightly less than the outlet concentration of the blood, but much less than the inlet concentration.

Physically speaking, countercurrent flow optimizes the concentration gradient throughout the length that the dialysate and blood are flowing next to one another. This causes more urea to diffuse through the membrane within this length, allowing the blood to be cleaned faster than cocurrent flow.

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It depends on both the wiring of the motor and what if any residual magnetic field remains in the field windings. If there is some residual field, you will get some volts, but not many. If the motor has permanent magnets, it is effectively a dynamo.

Ohm's laws says it will be 1.5 vdc divided by 330 ohms.

Anything left plugged in and powered up can drain the battery.

A: Most useful or actually the only time that it is useful is when it has reached its predictable reverse breakdown voltage.

watchdog timer is a 16 bit counter that resets the processor when it rolls over to zero. The processor can reset the counter or turn it off, but, correctly used, it will reset the processor in case of a code crash

Current can lag or lead voltage in an AC circuit when the load is what we call reactive. The idea that current is purely a function of voltage only applies when working with DC, or when working with purely resistive loads, such as light bulbs and toasters. Not so, when dealing with motors and power supplies.

What happens is that an inductor resists a change in current. That means that, given a particular voltage and current at a particular instant of time, if you change the voltage, the current will not immediately follow - it will lag - because the inductor is a stored energy device.

Similarly, a capacitor resists a change in voltage, which means that if you change the current, the voltage will not immediately follow - it will lag - also because the capacitor is a stored energy device. Flip over current and voltage in the analysis of a capacitor, and you find that the current will lead the voltage, as opposed to the inductor's current lagging the voltage.

This causes the phenomenon of power factor, which is basically the cosine of the phase angle between voltage and current. Power factor is the ratio of apparent power to true power.