By Valentine Sybille. Diagram. Publised at Sunday, December 17th 2017, 00:08:54 AM. The unloaded PCB appears green because thin sheets of green plastic have been applied to both sides (otherwise the PCB would appear pale yellow). Called solder masks, these sheets cover all exposed metal other than the component pads and holes so that errant solder can not inadvertently short (or electrically connect) the printed wires. All metal surfaces other than the exposed pads and holes (i.e., the wires) are underneath the solder mask. Not infrequently, blue or even red solder masks are used.
By Cyrielle Marjolaine. Amplifier. Publised at Sunday, January 07th 2018, 15:24:23 PM. First and probably the most important thing I learned is all grounds should not go directly to the chassis. This seems contrary to logic. A little side trip into electricity and conductors is appropriate now. Any conductor has some finite resistance and anytime some current is passed through it a voltage will be correspondingly created. Actually the voltage is first, but in this case we want to concentrate on the current. In a typical piece of audio equipment (most everything else as well) there are usually three distinct ground circuits. The first is obvious, the signal ground, the second is the power supply ground and third and often ignored is the case or chassis ground. Each has a particular function and all interact. The signal ground usual and primary function is to provide a return path for the audio. Likewise the power supply ground is the return path for the power used by the circuitry. The case ground I will cover a bit later. Remembering that anytime current flows through a conductor it will cause a voltage, let us see what happens if you mix the signal and power grounds. Each will generate a proportional corresponding voltage. So for an example: the conductor is a piece of wire that has a 1 ohm resistance, the signal voltage (and thus its return) has one millivolt (mV)of amplitude and the power supply is causing a flow of 100 milliamperes (mA) through the wire. The contribution to the voltages on the conductor is then, 1 mV for the signal and 0.1 Ampere times 1 ohm equals 100 mV for the power - see Ohm Law for equations. Since it is really unlikely that the power is perfectly clean DC it will contaminate the signal with hum and noise. Even a 1% noise level in the DC will result in a noise voltage equal to the signal voltage. I grant that this is a gross simplification, but it does illustrate the situation. So my rule number one is to absolutely avoid having any ground conductor handling both signal and power. So how do you do this? I find that a sort of modular arrangement is best. This does not mean that the physical components ca not be on the same board though. What it does mean is that the power supply is wired independently from the active signal portion. Eventually these grounds need to connect, but I will get to that later.
By Valentine Sybille. Diagram. Publised at Thursday, November 09th 2017, 22:24:37 PM. A schematic shows connections in a circuit in a way that is clear and standardized. It is a way of communicating to other engineers exactly what components are involved in a circuit as well as how they are connected. A good schematic will show component names and values, and provide labels for sections or components to help communicate the intended purpose. Note how connections on wires (or "nets") are shown using dots and non-connections are shown without a dot.
By Alix Loane. Diagram. Published at Monday, December 25th 2017, 03:55:15 AM. A digital circuit requires a power supply to provide a constant and stable source of electric power to all devices. As discussed above, electric power is derived from the basic electrical forces that charged particles (e.g., protons and electrons) exert on one another – namely, electrons are repelled by other electrons, and attracted to more electrically positive areas where there are relatively fewer electrons. The vast majority of charged particles are found in ordinary matter bound in electrically neutral atomic structures (that is, most particles are found in structures that have an equal number of positive and negative particles). Some electrically neutral conducting materials (like metals) contain electrons that are not so tightly bound to their host atoms. If a voltage source is applied to these materials, the lightly bound electrons will move away from the concentrated source of electrons on the negative side of the supply towards the electrically positive side of the supply. A “power supply” in a digital circuit provides a local, contained imbalance of electrons that provides a voltage source that can do useful work, such as transmitting information through a conductor from one device to another. A digital circuit allows a controlled flow of electrons from of the negative to positive side of the power supply, but only via the paths designed into the circuit. As electrons flow to and from the devices in a given circuit, they can change device properties in useful ways.
By Alix Loane. Circuit. Published at Monday, December 25th 2017, 03:27:19 AM. Electric circuits use electric power to perform some function, like energize a heating or lighting element, turn a motor, or create an electromagnetic filed. Electronic circuits differ from electric circuits in that they use devices that can themselves be controlled by other electric signals. Restated, electronic circuits are built from devices that use electricity to control electricity. Most electronic circuits use signals that are within 5 to 10 volts of ground; most circuits built within the past several years use signals that are within 3 to 5 volts from ground. Some electronic circuits represent information encoded as continuous voltage levels that can wander between the high and low voltage supply rails – these are called analog circuits. As an example, a sound pressure level transducer (i.e. a microphone) might drive a signal between 0V and 3.3V in direct proportion to the detected sound pressure level. In this case, the voltage signal output from the microphone is said to be an analog ifthe sound pressure wave itself. Other circuits use only two distinct voltage levels to represent information. Most often, these two voltage levels use the same voltages supplied by the power rails. In these circuits, called digital circuits, all information must be represented as binary numbers, with a signal at 0V (or ground) representing one kind of information, and a signal at 3.3V (or whatever the upper voltage supply rail provides) representing the other kind of information. In this series of modules, we will confine our discussions to digital circuits.
By Madeleine Catherine. Circuit. Published at Monday, December 25th 2017, 02:34:45 AM. A capacitor is a device that stores energy in the form of voltage. The most common form of capacitors is made of two parallel plates separated by a dielectric material. Charges of opposite polarity can be deposited on the plates, resulting in a voltage V across the capacitor plates. Capacitance is a measure of the amount of electrical charge required to build up one unit of voltage across the plates.
By Lydie Honorine. Circuit. Published at Monday, December 25th 2017, 02:27:56 AM. An often used and sometimes confusing term in electronic circuits is the word ground. The ground is a circuit node to which all voltages in a circuit are referenced. In a constant voltage supply circuit, one terminal from each voltage supply is typically connected to ground, or is grounded. For example, the negative terminal of a positive power supply is usually connected to ground so that any current drawn out of the positive terminal can be put back into the negative terminal via ground.
By Alix Loane. Diode. Published at Monday, December 25th 2017, 02:07:04 AM. Signal diodes also have many uses in processing signals in electronic equipment; they are used to obtain the audio and video signals from transmitted radio frequency signals (demodulation) and can also be used to shape and modify AC signal waveforms (clipping, limiting and DC restoration). Diodes are also built into many digital integrated circuits to protect them from dangerously large voltage spikes.
By Lydie Honorine. Circuit. Published at Monday, December 25th 2017, 02:06:30 AM. Voltage and current sources can be independent or dependent. Their respective circuit symbols. Independent sources are usually shown as a circle while dependent sources are usually shown as a diamond-shape. Independent sources can have a DC output or a functional output; some examples are a sine wave, square wave, impulse, and linear ramp. Dependent sources can be used to implement a voltage or current which is a function of some other voltage or current in the circuit. Dependent sources are often used to model active circuits that are used for signal amplification.
By Charlotte Myriam. Circuit. Published at Monday, December 25th 2017, 01:01:48 AM. When multiple components are connected in series, each component must carry the same current. When multiple components are connected in parallel, the total current is the sum of the currents flowing through each individual component. These statements are generalized as Kirchoff’s Current Law (KCL), which states that the sum of currents entering and exiting a node must be zero.
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