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  • coupling - What does an RF coupler actually do? - Electrical . . .
    To start with, I've had difficulty finding a good, simple explanation of what directional coupling is I read through Radio Electronics, but the section on directional couplers doesn't give an overview of what it means to "couple " Could someone offer a simple explanation of what "coupling" is and what a directional coupler actually does?
  • How does this HF coupler work? - Electrical Engineering Stack Exchange
    I came across this coupler design in this link in another question It's designed to be used to couple a small monitoring amount of signal off a 1 kW HF (3 MHz to 30 MHz) signal on a through line
  • high voltage - What types of bus couplers exist? - Electrical . . .
    A bus coupler is just a normal circuit breaker (and isolators), no matter where it's installed, or which busses it's connecting A "cross bus coupler" is just a bus coupler that happens to be connecting the two busses of a double-bus switchyard It's not a different type of switchgear and shouldn't be classified as such
  • opto isolator - Electrical Engineering Stack Exchange
    As long as the opto-coupler doesn't introduce a huge phase shift, causing feedback to get precariously close to becoming positive, or isn't asked to produce output current or voltage beyond its ability, then this closed-loop system as a whole finds and maintains the state
  • serial - UART isolation with opto-coupler - Electrical Engineering . . .
    UART isolation with opto-coupler Ask Question Asked 2 years, 8 months ago Modified 9 months ago
  • opto isolator - Electrical Engineering Stack Exchange
    Higher than 1kHz is not advised when using opto-coupler, because opto-coupler transistor switch-off time can be significantly longer than shortest PWM pulse Short PWM pulses are somewhat elongated, diminsihing control at low duty-cycle Any capacitance anywhere will further reduce PWM precision
  • opto isolator - Electrical Engineering Stack Exchange
    Opto-isolators are designed to switch a small amount of current A solid-state relay typically contains an opto-isolator along with some circuitry to switch a large amount of current in response to the small current switched by the opto-isolator
  • current - Electrical Engineering Stack Exchange
    From what I understand, my opto-coupler should be fast enough, so that it can transmit the narrowest pulse (1% duty cycle), which has a duration of 1% * (1 1000) = 10 μs Consequently, I need to have: tr + tf < 10 μs, where tr and tf are rise and fall times of the opto-coupler Is the above logic correct?
  • When do we prefer isolator over optocoupler?
    A opto-coupler or opto-isolator (different words for the same thing) is only one method Opto-isolators can be broken into a few broad catagories The most common is a LED shining on a phototransistor As you found, these usually have a few µs to to 10s of µs propagation delay, particularly when turning off
  • Opto-coupler high vs low CTR - Electrical Engineering Stack Exchange
    I want to understand how the CTR of an opto-coupler is linked with its other parameters, for example its switching speed or time delay between input and output or any other parameter I am using





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