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HOME-BUILDING AMATEUR RADIO EQUIPMENT CHAPTER 2
HOME-BUILDING AMATEUR RADIO EQUIPMENT CHAPTER 2

... be 50 times higher for the same amount of power. Therefore the voltage drop across lead inductances will be 50 times higher and, starting with 12 volts, you don't have much voltage to lose. Suddenly each component in your circuit acts as if it has an inductor in series with it. These unwanted induct ...
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... are two 1.5-V batteries in series in a flashlight, the potential across the bulb will be 3.0 V. The batteries need not be nearly identical. Batteries are connected in parallel to increase the total amount of current available to a device. The batteries need to be nearly identical. If they are not, t ...
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... are two 1.5-V batteries in series in a flashlight, the potential across the bulb will be 3.0 V. The batteries need not be nearly identical. Batteries are connected in parallel to increase the total amount of current available to a device. The batteries need to be nearly identical. If they are not, t ...
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... However, whenever we have a capacitor that is being charged, or discharged, this is not the case. Now, consider a circuit that consists of an emf, a resistor and a capacitor, but with an open switch With the switch open the current in the circuit is zero and zero charge accumulates on the capacitor ...
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Operational amplifier



An operational amplifier (""op-amp"") is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. In this configuration, an op-amp produces an output potential (relative to circuit ground) that is typically hundreds of thousands of times larger than the potential difference between its input terminals.Operational amplifiers had their origins in analog computers, where they were used to do mathematical operations in many linear, non-linear and frequency-dependent circuits. The popularity of the op-amp as a building block in analog circuits is due to its versatility. Due to negative feedback, the characteristics of an op-amp circuit, its gain, input and output impedance, bandwidth etc. are determined by external components and have little dependence on temperature coefficients or manufacturing variations in the op-amp itself.Op-amps are among the most widely used electronic devices today, being used in a vast array of consumer, industrial, and scientific devices. Many standard IC op-amps cost only a few cents in moderate production volume; however some integrated or hybrid operational amplifiers with special performance specifications may cost over $100 US in small quantities. Op-amps may be packaged as components, or used as elements of more complex integrated circuits.The op-amp is one type of differential amplifier. Other types of differential amplifier include the fully differential amplifier (similar to the op-amp, but with two outputs), the instrumentation amplifier (usually built from three op-amps), the isolation amplifier (similar to the instrumentation amplifier, but with tolerance to common-mode voltages that would destroy an ordinary op-amp), and negative feedback amplifier (usually built from one or more op-amps and a resistive feedback network).
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