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modular electric longboard
modular electric longboard

NC7SP57 • NC7SP58 TinyLogic ULP Universal Configurable 2-Input Logic Gates
NC7SP57 • NC7SP58 TinyLogic ULP Universal Configurable 2-Input Logic Gates

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... ‘powertrack system’ means an assembly of system components including a generally linear assembly of spaced and supported busbars by which accessories may be connected to an electrical supply at one or more points (pre-determined or otherwise) along the powertrack. ‘protective conductor’ means a cond ...
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... they can design their own customized, intelligent inventions with Parallax Inc.’s BASIC Stamp® microcontroller module. The activities in this text incorporate a variety of fun and interesting experiments designed to appeal to a student’s imagination by using motion, light, sound, and tactile feedbac ...
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... 5.3-8. From Fig. 5.3-8, we can see that the I-V curves are very crowded when VG 2 is small. Thus when VG 2 is small, Vout does not change much. We may even say that it remains a constant. But, as VG 2 reaches a certain value, Vout sharply ...
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... wire is made, but also the geometry of the wire. If we were to increase the length of wire, for example, the measured resistance would increase. Also, if we were to decrease the diameter of the wire, the measured resistance would increase. We want to define a property that describes a material's abi ...
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MAX823-825 - Maxim Part Number Search

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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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