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Thyristor Product Catalog
Thyristor Product Catalog

bus ele cat 1007 16 services
bus ele cat 1007 16 services

... illustrated in Figure 2, if an overload current occurs and persists for more than a short interval of time, the temperature of the link eventually reaches a level which causes a restricted segment of the link to melt. As a result, a gap is formed and an electric arc established. However, as the arc ...
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... Question Number. ...
74AUP1Z125 1. General description Low-power X-tal driver with enable and internal resistor;
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... enable circuitry and an internal bias resistor to provide a device optimized for use in crystal oscillator applications. When not in use the EN input can be driven HIGH, pulling up the X1 input and putting the device in a low-power disable mode. Schmitt trigger action at the EN input makes the circu ...
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... External Alert Devices After reception of an alert, relay REL1 is activated by T6, R13 and R14. Resistor R30 limits the current and D2 serves as a free-wheeling diode. The time the relay stays active , i.e.the time the working contacts REL1A are closed, can be programmed (pager programming). Further ...
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... on its outputs. This should be interpreted as "a possible single pulse, no longer than the duration of the R level". The actual device's output may or may not change, depending on the transition times of the inputs. In previous versions of PSpice, gates which were presented with such inputs would si ...
1 2 3 4 5 ... 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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