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Placing a Digital Meter in Circuits - Cleveland Institute of Electronics
Placing a Digital Meter in Circuits - Cleveland Institute of Electronics

... You can place the meter on either side of the resistor. Notice the polarity of the meter leads are opposite from where they would be measuring voltage. 3Ω ...


... send the necessary voltage with which the microcontroller can operate without any problem. The other part of the voltage which is divided by the voltage divider is given in parallel connection to the voltage given out from the ignitor crystal .The added voltage is given to the battery. If the voltag ...
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Automated CVR

... • Maximum Voltage Drop Variance (Vdv) between feeders within the same voltage control zone (during period)  Must be < 0.25 p.u. or < 2.0V • Maximum Voltage Drop (Vd) for secondary – Must be < 4.0%, based on design standards and criteria • Voltage level must be > (114V+1/2 Bandwidth) and less than ( ...
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Capabilities Brochure

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... Note 1: All devices are 100% tested at TA = +25°C. Limits over temperature are guaranteed by design and characterization. Note 2: Current into a pin is defined as positive. Current out of a pin is defined as negative. All voltages are referenced to ground except VTH, VTL, VOD, and ∆VOD. Note 3: Guar ...
Lucalox™ HO - GE Lighting
Lucalox™ HO - GE Lighting

... Survival rate and lumen maintenance Average lamp life & lumen maintenance is based on laboratory tests of a large number of representative lamps under controlled conditions, including operation at 11 hours per start on ballasts having specified electrical characteristics. The following conditions can ...
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IOTA ICE-420-EM-A Emergency Ballast Specification Sheet

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SIVA INSTRUMENTS Digital Surge Tester

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... Juergen Neuhaeusler, Carsten Thiele ABSTRACT Output voltages of DCDC converters typically are precisely regulated at the location the feedback divider is connected. In case of longer connections to the load which, for example, is not on the same PCB the precision of the regulation suffers from the w ...
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Radio Shack HTX-100 Microphone Amplifier

... The following schematic fragment was excerpted from a scanned copy of the HTX-100 Service Manual found on the web here. In the following schematic fragment, the following color conventions were chosen to highlight key functions in the transmit microphone and ALC audio circuitry: - Red, Audio/Mic cir ...
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BAS20 General Purpose High Voltage Diode B A

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Capacitors and Current

... This voltage difference across the capacitor opposes the battery voltage, decreasing the current flow. Once the voltage difference across the capacitor reaches the battery potential, current flow stops. So the increase in potential across the capacitor is proportional to the difference between the b ...
Portable Sensing Field Device: Noncontact Ranging
Portable Sensing Field Device: Noncontact Ranging

... eye, but visible enough to be useful in the development stages of our project. Our APD has the highest quantum efficiency in at the 800nm range, so 780nm is acceptable for our application. The output power of the laser is 100mW. It is necessary to use such a high-powered laser because after the beam ...
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ELEC 225L Circuit Theory I Laboratory Fall 2010
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... high-side FET, and its duty cycle (D) ramps gradually from zero to that required for regulation. However, if during soft-start, the synchronous rectifier (SR) FET is on when the high-side FET is off (SR FET duty cycle = 1 - D), the SR sinks current from the output (through the inductor), tending to ...
QED PROD DIRECT (DEC) 1A (Page 1)
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< 1 ... 1637 1638 1639 1640 1641 1642 1643 1644 1645 ... 2207 >

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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