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DM7417 Hex Buffers with High Voltage Open
DM7417 Hex Buffers with High Voltage Open

GSR-200 Galvanic Skin Response Amplifier
GSR-200 Galvanic Skin Response Amplifier

... so that the Current (I) flowing across the skin from one electrode to the other is equal to applied voltage divided by the resistance: I = 200mv/R = 200mV*G In the GSR amplifier, the Current (I) flows through a 1megOhm feedback resistor to produce the Output Voltage (Vout), so that: G = Vout / 0.200 ...
ECE 331:  Electronics Principles I Fall 2013
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... down, the supply voltage is lowered to the minimum allowed by the digital portions of the chip. Since many analog structures require higher voltage than this to operate, the analog portion of the chip may have to use on-chip circuitry to increase the supply voltage. A. Using C1= 2pF, C2= 2pF, and Vi ...
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... (Continued from first page) "Circuits from the Lab" are intended only for use with Analog Devices products and are the intellectual property of Analog Devices or its licensors. While you may use the "Circuits from the Lab" in the design of your product, no other license is granted by implication or ...
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... 1. To study the transient response of a series LCR circuit and calculate its resonant frequency, damping factor, quality factor, relaxation time and logarithmic decrement. 2. To design the two stages RC Coupled CE Amplifier and plot the variation of voltage gain with change in frequency of carrier w ...
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... If cost considerations preclude using low tolerance resistors (0.02% or better), the processor to which the LTC2400 is connected can be used to perform software correction. Operated as a follower, the LTC1050’s gain and linearity errors are less than 0.001%. The circuit in Figure 1 shows an optional ...
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... A medium power amplifier that is characterized by a lot of good sound quality, but simultaneously is very simple in the construction. Him uses, enough time in my active loudspeakers. In his output stage exist the very good FET transistors, technology HEXFET, transistor which are controlled by voltag ...
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Resistive opto-isolator



Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator or lamp-coupled photocell, is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically isolated from each other. The light source is usually a light-emitting diode (LED), a miniature incandescent lamp, or sometimes a neon lamp, whereas the detector is a semiconductor-based photoresistor made of cadmium selenide (CdSe) or cadmium sulfide (CdS). The source and detector are coupled through a transparent glue or through the air.Electrically, RO is a resistance controlled by the current flowing through the light source. In the dark state, the resistance typically exceeds a few MOhm; when illuminated, it decreases as the inverse of the light intensity. In contrast to the photodiode and phototransistor, the photoresistor can operate in both the AC and DC circuits and have a voltage of several hundred volts across it. The harmonic distortions of the output current by the RO are typically within 0.1% at voltages below 0.5 V.RO is the first and the slowest opto-isolator: its switching time exceeds 1 ms, and for the lamp-based models can reach hundreds of milliseconds. Parasitic capacitance limits the frequency range of the photoresistor by ultrasonic frequencies. Cadmium-based photoresistors exhibit a ""memory effect"": their resistance depends on the illumination history; it also drifts during the illumination and stabilizes within hours, or even weeks for high-sensitivity models. Heating induces irreversible degradation of ROs, whereas cooling to below −25 °C dramatically increases the response time. Therefore, ROs were mostly replaced in the 1970s by the faster and more stable photodiodes and photoresistors. ROs are still used in some sound equipment, guitar amplifiers and analog synthesizers owing to their good electrical isolation, low signal distortion and ease of circuit design.
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