AN439 87C751 fast NiCad charger - Rcl
... Q104, C118, R114, U104 as well as R115, R116 and C119 operating in conjunction with the 87C751. In this application a simple, low-cost ADC with relatively high resolution is required, but it does not need linearity, absolute accuracy or long term stability because the detection method is relative to ...
... Q104, C118, R114, U104 as well as R115, R116 and C119 operating in conjunction with the 87C751. In this application a simple, low-cost ADC with relatively high resolution is required, but it does not need linearity, absolute accuracy or long term stability because the detection method is relative to ...
Progress in On-Line Measurement of PD in G.C. Stone I. Culbert
... significance. LCI drives do produce voltage impulses, but they use GTO or thyristor switching devices that have risetimes longer than 1 μs, which can be readily filtered out by PD detectors operating in the VHF (30-300 MHz) range. However, the VS-PWM type of drive produces significant short-risetime ...
... significance. LCI drives do produce voltage impulses, but they use GTO or thyristor switching devices that have risetimes longer than 1 μs, which can be readily filtered out by PD detectors operating in the VHF (30-300 MHz) range. However, the VS-PWM type of drive produces significant short-risetime ...
5.3 Power Supply Systems Word Document | GCE AS/A
... Line and Load Regulation Ideally, a power supply should deliver a constant output voltage regardless of any changes that take place in the input or output circuits. In particular, the mains supply voltage, (the line voltage,) increases and decreases significantly depending on national factors such a ...
... Line and Load Regulation Ideally, a power supply should deliver a constant output voltage regardless of any changes that take place in the input or output circuits. In particular, the mains supply voltage, (the line voltage,) increases and decreases significantly depending on national factors such a ...
Power Electronics - Dr. Imtiaz Hussain
... • This conversion method is more power efficient (often 75% to 98%) than linear voltage regulation (which dissipates unwanted power as heat). • This efficiency is beneficial to increasing the running time of battery operated devices. ...
... • This conversion method is more power efficient (often 75% to 98%) than linear voltage regulation (which dissipates unwanted power as heat). • This efficiency is beneficial to increasing the running time of battery operated devices. ...
Review
... Thus we will get the same information from the analysis of a simple circuit independent of the direction we choose to analyze the circuit. ...
... Thus we will get the same information from the analysis of a simple circuit independent of the direction we choose to analyze the circuit. ...
TR41.9.2-03-11-034-MR2-GeneralInformation
... evaluated over the expected range of facilities and their operating characteristics. However, this is impractical and produces results that may not be repeatable. Thus, circuits were devised that would reasonably simulate those characteristics of the network that affect the CPE operation from a netw ...
... evaluated over the expected range of facilities and their operating characteristics. However, this is impractical and produces results that may not be repeatable. Thus, circuits were devised that would reasonably simulate those characteristics of the network that affect the CPE operation from a netw ...
adom smart i/o - Smart Controls, LLC
... fully counter-clockwise (CCW) position to a fully clockwise (CW) will allow adjustment over the analog voltage or current range. When an input channel is in the manual mode, a red light emitting diode (LED) indicator will be illuminated providing the user with confirmation the particular analog chan ...
... fully counter-clockwise (CCW) position to a fully clockwise (CW) will allow adjustment over the analog voltage or current range. When an input channel is in the manual mode, a red light emitting diode (LED) indicator will be illuminated providing the user with confirmation the particular analog chan ...
BSNL_TTA_Electricalspecialization
... 36. The current in circuit having 5 V EMI source and 10 Ohm resistance is: a. 2 Amp b. 50 Amp c. 5 Amp d. ½ Amp 37. The chopper is a device to change a. Voltage b. Current c. Frequency d. None of these 38. The power consumption, in case of centrifugal loads (like pump, fan, blower etc) is proportion ...
... 36. The current in circuit having 5 V EMI source and 10 Ohm resistance is: a. 2 Amp b. 50 Amp c. 5 Amp d. ½ Amp 37. The chopper is a device to change a. Voltage b. Current c. Frequency d. None of these 38. The power consumption, in case of centrifugal loads (like pump, fan, blower etc) is proportion ...
SECTION (ELECTRICAL) 1. In a D.C. generator, if the brushes are
... 21. The function of processing zenger diode in a UJT circuit used for triggering of SCRs is to a. Expedite the generation of triggering pulses ...
... 21. The function of processing zenger diode in a UJT circuit used for triggering of SCRs is to a. Expedite the generation of triggering pulses ...
Design_Considerations_for_High_Step
... by the fact that a dc-dc converter is a non-linear system, so an easy-to-understand mathematical description or dynamic model of the converter is not immediately evident. Such a model must first be derived, first by averaging the dc-dc converter to eliminate the effects of switching. This leaves a n ...
... by the fact that a dc-dc converter is a non-linear system, so an easy-to-understand mathematical description or dynamic model of the converter is not immediately evident. Such a model must first be derived, first by averaging the dc-dc converter to eliminate the effects of switching. This leaves a n ...
Class Notes
... terminal of the battery and the anode (+) is connected to the positive terminal of the battery the diode will conduct a current. When connected like this the diode is said to be forward biased. When connected like this the diode conducts electricity and the bulb lights. ...
... terminal of the battery and the anode (+) is connected to the positive terminal of the battery the diode will conduct a current. When connected like this the diode is said to be forward biased. When connected like this the diode conducts electricity and the bulb lights. ...
APDs VFP-1000 Series
... Voxtel’s SCM-APDs can be operated at high gain with low noise, providing a significant advantage. The Siletz series of SCM-APDs has a low effective ratio of ionization coefficients (keff ~.02), and can be operated with low excess noise: F(M)<2 up to M=10, and F(M)<3 up to M~40, with maximum usable l ...
... Voxtel’s SCM-APDs can be operated at high gain with low noise, providing a significant advantage. The Siletz series of SCM-APDs has a low effective ratio of ionization coefficients (keff ~.02), and can be operated with low excess noise: F(M)<2 up to M=10, and F(M)<3 up to M~40, with maximum usable l ...
Strain Gages and Signal Conditioning
... object, they are measuring strain. Strain is the ratio of the change in dimension of an object to the original dimension Mechanical strain ...
... object, they are measuring strain. Strain is the ratio of the change in dimension of an object to the original dimension Mechanical strain ...
Digital Decoders
... Apply basic Ohm’s law to calculate resistor voltage. Subtract the VF of the LED from the supply voltage. ...
... Apply basic Ohm’s law to calculate resistor voltage. Subtract the VF of the LED from the supply voltage. ...
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.