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Memristor is a portmanteau of the words memory and resistor
Memristor is a portmanteau of the words memory and resistor

... charge, which causes the device to return to it's initial state. The memristor will maintain its configuration even if the current is cut off, making it a more robust memory solution compared to the devices currently on the market. ...
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... circuit has been designed so the resistance of the potential circuit also does not affect the measurement. Pressing a latchable button converts the instrument from its four-terminal measurement mode to a three-terminal one. The reversing d.c. test current has a frequency of 128 Hz, which avoids poss ...
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... Discuss various types of capacitors. Analyze series capacitors. Analyze parallel capacitors. Analyze capacitive DC switching circuits. Describe the basic structure and characteristics of an inductor. Discuss various types of inductors. Analyze series inductors. Analyze parallel inductors. Analyze in ...
Amateur Extra Licensing Class
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... In a parallel circuit voltage is the same at any point in the circuit. In a parallel circuit amperage adds up from all the current drops in the circuit. In a parallel circuit total resistance is the reciprocal of the sums of the reciprocals resistance of the circuit. The total resistance of a parall ...
www.Jameco.com 1-800-831-4242 ✦ Distributed by:
www.Jameco.com 1-800-831-4242 ✦ Distributed by:

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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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