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56 Threads found on edaboard.com: Isolation And Resistor
Node V_DIODE_A is shorted to ground by voltage source "Logic1". You may want to use the 2.3k resistor to isolate the voltage source by changing it's position in the circuit. Or preferably use a series choke for RF isolation.
So changing loop impedance (with isolation resistor) would only change the ground loop current and not the induced voltage in the ground loop, right? Yes, did someone claim anything different? To get rid of the ground voltage drop interference, you'll either use differential signaling or a constant current driver.
1/2W to my eye but hard to tell in isolation, and no reference
Hello, Would you say that the 10R (0603 size) resistor in the grey shaded ?bubble? is unnecessary? (PDF schematic of 48V to 1V5 at 65A SMPS attached) The component ?MOD2? is an electronic transformer with isolation between its input and output?however, we don?t actually need isolation. The 10R resistor (...)
you couldnt even put the boot cap there,and a big resistor from it to gnd, so that the cap got charged up enough for you to get started.......because the batt voltage will put an end to Warpspeeds solution looks good and ripe for use. Try to pick a module with as little capacitance as poss across its isolation barrier.
What is the design center frequency? Show me the characteristic impedances and isolation resistor values you have used?
You need fully optical isolation or just a protection for output pin of mcu? If you need optocouple, just use pull down resistor and pull it to high with optocouple.
100(5)A means 100A primary (input/measured) current and 5A (full scale) output current. If you only need to measure AC currents (and you need galvanic isolation, too) a CT it's a better option, as it only requires a single external burden resistor (and maybe a simple rectifying/filtering circuit) to feed (...)
You'll notice that most industry standard SMPS have the reference and error amplifier for voltage or current feedback on the secondary side and are transmitting the error signal with an opto coupler. This way, the accuracy and linearity requirements for the analog isolator are much lower and can be usually (...)
I'd suggest you use a small transformer to get safe isolation. Something out of a junk "wall wart", or if you have an AC-output one, as-is. Apply the output to a resistor divider that centers the voltage within the rails of the uC's digital inputs, through a series resistor that makes the signal rail-rail at the input node, (...)
hi,all now im working on a 4-way power divider without the isolation resistor R,but when simulation it,unfortuately,i get bad results. my question is: 1.the VSWR(S44) and VSWR(S55) of the output side is more than 4.0,i don't know why it is so the impendence of the quarter-wave 70.71ohm? the files as follow:10325
You need isolation for the gate driver signal (e.g. by an optocoupler) and an isolated power supply. Or a level shifting driver designed specifically for the application.
The opamp and microcontroller are both connected directly to the 230VAC which is a deadly danger. isolation is needed. Voltage spikes on the 230VAC will destroy an opamp. An input protection circuit is needed. The input resistor needs to be made to use high voltages.
If ground to neutral isolation is required and a measurement transformer isn't an option, symmetrical voltage dividers and differential amplifiers are probably the next best variant, as used in oscilloscope high voltage differential probes.
The capacitor is used as though it was a resistor with equivalent value to it's reactance. In other words, it behaves like a resistor with value of 1/(2*pi*f*C) where f is in Hz and C is in Farads. Beware that this provides NO safety isolation so no part of the circuit should be touchable and that it is (...)
6N137 is not the solution If Ve (pin 7) is low then the output will always be high per the truth table on page 2 of the data sheet. The device is not enabled when Ve is low so this is expected. If you do not need the isolation of a opto a single MOSFET and resistor would be much cheaper. Depending on how the switch is used there may be a (...)
A Fet set up as an amplifier with an accompanying attenuator pad will work ok (maybe 15 dB of isolation), although it might add additional noise or intermodulation products. But since a fet and resistor pad will cost < 1$, and an isolator will cost is an experiment worth running for a production job. Of course, you realize (...)
It depends on how you want to use the 5V. First a warning - if you do not use a transformer you face a serious risk of electrocution. resistor and capacitor votage droppers do not provide any safety isolation barrier, effectively you are connected directly to the 230v AC with all the dangers that implies. If you understand (...)
If you put a stiff gate drive on any FET, the Cgso & Cgdo, and the gate-channel capacitance (which partitions to D, S) all are shunt losses. If you take a hint from CMOS and FET / HEMT RF switches and isolate the gate with a resistor, this is much improved and you are left with the Ron (insertion loss) (...)
Please suggest how to sense AC voltage without isolation transformer by using combination of Resistance and Capacitors. i need to convert AC 230V to a level of 0-5V so that i can sense it using a Microcontroller. I have heard about isolated OP-AMPS are used for that purpose but never used them practically please share your ideas and circuits (...)