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MP11 High Sensitive Metal Detector for Detecting Metal Objects
MP11 High Sensitive Metal Detector for Detecting Metal Objects

... (Better Security System for to Detect Terrorists / Human Bombs) One of the simplest methods of metal detecting is by beat frequency oscillator. Basically, the circuit consists of two balanced oscillator. One oscillator provides the reference signal, and other oscillator is acting as the detector ele ...
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voltage-controlled oscillator for fm broadcast radio receiver

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Principles of Electronic Communication Systems
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... transistor amplifier that acts like either a variable capacitor or an inductor. When the circuit is connected across the tuned circuit of an oscillator, the oscillator frequency can be varied by applying the modulating signal to the amplifier. Reactance modulators can produce frequency deviation ove ...
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A sensitive detection method for capacitive ultrasonic transducers

... needed to achieve reasonable sensitivity, and the dependence of the output on the ultrasound frequency. The former problem is a handicap in building an array of transducers. In this letter we propose an alternative method to measure the displacement in a more sensitive manner. The new method involve ...
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SGA3463Z 数据资料DataSheet下载

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... On a logarithmic grid, the numbers 1, 2, 5, and 10 (in any decade) are about equal distances from each other. Since gain plots are usually drawn on log-log grids, it is common practice to acquire data in frequency increments of 1, 2, 5, 10. For example, if the desired frequency range starts at 10 Hz ...
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Homework 1 - web page for staff
Homework 1 - web page for staff

... EIE 211 Homework 1 Due next class 1. The circuit in figure below utilizes an ideal op amp. a) Find I1, I2, I3 and Vx b) If Vo is not to be lower than -13V, find the maximum allowed value for RL ...
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Measurement of internal work during running

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Superheterodyne receiver



In electronics, a superheterodyne receiver (often shortened to superhet) uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original radio carrier frequency. It was invented by US engineer Edwin Armstrong in 1918 during World War I. Virtually all modern radio receivers use the superheterodyne principle. At the cost of an extra frequency converter stage, the superheterodyne receiver provides superior selectivity and sensitivity compared with simpler designs.
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