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g Accelerometer ADXL335 Preliminary Technical Data
g Accelerometer ADXL335 Preliminary Technical Data

... orthogonal with little cross axis sensitivity. Mechanical misalignment of the sensor die to the package is the chief source of cross axis sensitivity. Mechanical misalignment can, of course, be calibrated out at the system level. ...
sample questions - Department of Electrical Engineering, IIT
sample questions - Department of Electrical Engineering, IIT

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... Last week we used batteries. Batteries have a finite lifetime and tend to run down, especially in a lab setting. This week, we will replace batteries with power supplies. The power supply does exactly the same job as a battery (it is a constant voltage source), but it will not run down over time. In ...
TEJ2 Power Supply Appendix B Safety Notes
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... ground of the AC line. Microwave ovens use the chassis as ground return for the high voltage. In addition, do not assume that the chassis is a suitable ground for your test equipment! ...
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... Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any ...
2. Network theorems
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... ii) As soon as mains is ON .the reading in the meters must be zero. If the reading in the meters is not zero, check the meters. iii) Keep the hands away from the mains transformer. iv) Both the power supplies are short circuit protected. ...
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... WS2813 is an intelligent control LED light source that the control circuit and RGB chip are integrated in a package of 5050 components. Its internal include intelligent digital port data latch and signal reshaping amplification drive circuit. Also include a precision internal oscillator and a 12V vo ...
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... 1. Users should independently evaluate the suitability of and test each product selected for their own application. 2. This product should not be used in an application where the maximum interrupt voltage or maximum interrupt current can be exceeded in a fault condition. Operation beyond the maximum ...
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ELEC 5970-001/6970-001 Special Topics in Electrical Engineering
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... to 1 transitions. Thus, the first output transition is caused by two input transitions, one on each input. This subtracts 1 from the above upper bound. Next, consider the last transition at the output. The last transition at any output is a sufficient condition for this. Thus, the first one of the l ...
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... charge will flow from the blue to the green ball due to polarization. Once disconnected, the charges will remain on the separate conductors even when the rod is removed. Follow-up: What will happen when the conductors are reconnected with a wire? ...
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... While the AD8022 is internally short-circuit protected, this may not be sufficient to guarantee that the maximum junction temperature (150°C) is not exceeded under all conditions. To ensure proper operation, it is necessary to observe the ...
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... 2. A critical component is any component of a life support which, (a) are intended for surgical implant into the body, device or system whose failure to perform can be or (b) support or sustain life, or (c) whose failure to perform reasonably expected to cause the failure of the life support when pr ...
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... RF input pin. This pin is NOT internally DC blocked. A DC blocking capacitor, suitable for the frequency of operation, should be used in most applications. DC coupling of the input is not allowed, because this will override the internal feedback loop and cause temperature instability. Ground connect ...
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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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