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36. How to choose the DC power supply filter capacitor?

In Electronic Infomation Category: 3 | on November 25,2011

Filter capacitor in the switching power supply plays a very important role, the right choice filter capacitor, especially the choice of the output filter capacitor is every engineering and 36 datasheet and technical personnel are very concerned about. 50 Hz frequency circuits used in common electrolytic capacitors, the ripple voltage frequency of only 100 Hz, charge and 36 price and discharge time is orders of magnitude of milliseconds. For smaller ripple factor, the required electrical capacity of up to hundreds of thousands of microfarads, the general low-frequency electrolytic capacitors of the main objective is to increase the capacitance, capacitor capacitance, loss tangent and 36 suppliers and leakage current is to identify their advantages and disadvantages of the main parameters. The switching power supply output filtering elec...

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36 RF, audio and high-frequency relationship?

In Electronic Infomation Category: 3 | on October 09,2011

RF (Radio Frequency, RF) is the RF current, it is a high-frequency electromagnetic waves referred to the exchange variation. Changes less than 1000 times per second, known as the low-frequency alternating current, more than 10,000 times as high-frequency current, while the radio is such a high frequency current. Audio: Audio signal is a continuous analog signal, the audio signal on the formation of a continuous sound. The most common way is through the pulse code modulation PCM (Pulse Code Modulation) digital audio features. Sampling frequency sound wave is the number of times per second sampling. According to this sampling method, sampling frequency is able to reproduce the sound frequency doubled. Upper limit of human hearing frequency around 20 kHz in order to ensure sound without dis...

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36. What external ECG signal will interfere?

In Electronic Infomation Category: 3 | on September 30,2011

First, that the generation of ECG: heart rate at all times in accordance with a certain beat and 36 datasheet and rhythm, the heart with each beat, first excited to produce electricity, electric excitement began in the sinus node, and 36 price and along the cardiac conduction system under the special pass, has excited the atrium and 36 suppliers and ventricle, the systolic implementation of pump function. This has ordered the spread of excitability can be transmitted by human tissue surface, resulting in a series of potential changes, ECG was recorded form. (ECG reflects the heart of exciting generation, transmission and recovery process of bio-electrical changes in the heart various parts of the myocardial cells have many potential changes occurred in overall performance, not due to mechanical contraction of the heart produced.) Preci...

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