Search Engine www.edaboard.com

# Open And Short Circuit

122 Threads found on edaboard.com: Open And Short Circuit

## Transformer saturation current

As said, the question isn't related to saturation at all, simply a matter of transformer impedance respectively percent X and R. It's relative high for a small transformer, the datasheet says 35% voltage drop between open circuit and rated load. Can be read as about 35 percent Z, so short (...)

## Looking for work-around to delay open circuit detector on power-up

Hi, This is a circuit in progress/in the design stage, so LED measured voltages are real, 18V supply is based on the last AC/DC transformer experience (18.7V out when loaded with a similar circuit/current load), voltage references and divided down reference of TL431 are also real and tried out; INA826 is based on (...)

## Open circuit/ Short circuit behavior of an antenna

What does physically happen when a receiver antenna in open circuit/ and short circuit mode is exposed to RF signal? Is the power reflected back?

## Determining Characteristic Impedance with T-line Circuit Model

I have a roll of 100 feet of old-fashioned twisted pair telephone cable. I measured the impedance at one end with an impedance analyzer. The analyzer sweeps frequency from 10 kHz to 5 mHz; the frequency (horizontal) scale is linear rather than the more common logarithmic format. The measured impedance is shown on a vertical scale ranging from 10 oh

## High impedance output to control on-off state

Hi, i have 2 DC-DC converters which i want to control their on-off state. However, one of them is at on-state when i apply 3-12V or open circuit and off-state when i apply 0-1.2V. Other one is at on-state when i apply open or high impedance and off-state when 2...4 mA current applied via 1KOhm resistor. I (...)

## Open Drain or Open Collector Configuration

Hi, A open collector (or open drain) circuit needs a resitor as pullup. The bjt switches to GND, when activated. The resistor limits the current to a safe value and pulls the voltage to VCC when the bjt is not activated. The benefit is, that there will never be a short circuit condition (...)

## When open-circuited stubs are preferred over short-circuited stubs?

In filters / matching schematic. For example, if we do not want to add DC block capacitor on drain of transistor, we can use open-circuited matching stub. Also sometimes single-stub matching can be more compact with open-circuited stub and additional phasing line for rotating on Smith Chart. There is my (...)

## RF antenna lightning protection

@1.6GHz you should be able to contrive a simple shorted 1/4 wave stub as the DC injection choke, then cap, GDT and transorb the hell out of the DC end of the choke, that way the RF short circuit at the end of the stub is transformed to an open at the feedline at the operating frequency so the capacitance of (...)

## Can underground wire go bad with no visible breaks in it???

C_mitra mean't was short a pair at one end and make sure you get a short at the other end. If you get an open then make a note of the which wires make your pair up. Change one wire for any other and see if the open circuit stays, then its the unchanged wire. If it comes good (...)

## How to simulate faulty circuit

Tina TI nags all the time with error messages :), and you can set some components to open or short, not sure if it always shows what will work or not though. Maybe any of the Spice variations also, as it is the same/ a similar platform.

## How short circuit Capacitor in proteus simulation

119728 I simulation cable model circuit for circuit Vsource=30kV AC when C27 have 15kV S1 is short C27 to 0V and open circuit any loop but!!! I don't have plot graph by current C28(2) How any thing sim this circuit? or 0ther program support this (...)

## reflection of electromagnetic wave

I understood you have to calculate the length L of a coaxial transmission line at wich the input impedance is a short circuit when it's left open at the other side. at a length equal to a quarter wavelength (and it repeats every rotation of pi) an open circuit at a side of a line will be (...)

## auto shut off with high negative dc voltages

When you say "shut the circuit off", do you mean open circuit the input voltage or short out the output current? Frank

## Open circuit and short circuit a port on CST

I understand that you have one model with two antennas, and each antenna is connected to a port. Now you want to simulates the interaction between the two antennas. First you get S21 from the 2-port simulation. Then, instead of creating two additional 1-port EM models (one with antenna 2 shorted, the other with antenna 2 (...)

## Solar panel open circuit in bright sunlight?

If a solar panel is open circuit and the sun shines, then what happens to the charge generated, does it charge up and up and blow up the solar panel?

## Single ultrasonic transceiver switching between Rx and Tx

To suppress the ringing after Tx , you may need to short out the transducer with transistor active switch to ground for <1ms , rather than open circuit switch. The tail of the high impedance resonant energy will be absorbed quickly. ( Like a motor/generator brake effect) That should work using one shot or some equiv. cct.

## Buck Converter Design

I wish to design a buck converter for charging 12 V and 7 Ah Lead Acid battery from PV panels. My panels are: 21.1 V: open circuit Voltage (Input to buck converter) 4.12 A: short circuit Current (Input to buck converter) I need buck converter of output 4 A, 15 V = 60 W What is the watt rating of your (...)

## Advice on a Solar Charger

How do you plan to convert the 3V to 9V efficiently? Is 3V the MPT operating voltage (max power transfer) or the open circuit voltage and short circuit current at max solar input power? I assume you phone uses 9V input down to 6V? Is that a Lithium rechargeable 9V cell? I think a 1N4100 (not IN4100) is (...)

## Will the resistance of a resistor permanently change when heated to high temperatures

Data terminators are usually 50 , 60,75,93 etc or 120 ohm for coax and twisted pair or CAT5 for single ended. some are not short circuit protected if used to pullup to Vcc. Metal,Film,resistors,usually,fail in open circuit mode. So use two 100 Ohm in parallel and check.

## 12Vac with 3V voltage sag

You do not say what current your sagging 12 AC line has to cope with. If you wire the secondary of a low voltage transformer in series with your 12 AC and put a short on the primary of the transformer, you will get only the leakage inductance in series with it. If you open circuit the primary (Beware high voltage), you will (...)

## doubt about open collector/drain using in i2c

This is called a wired-OR configuration. Only the LOW condition is an active output, where the open drain sink the signal to 0V. This way there is no danger for a collision between HIGH and LOW, resulting in a short circuit. Reading the status there is also no problem With a logical collision, since the unit expecting a (...)

## Stubs in the electronics or microwave

if you are going to do microwave engineering, you need to know what impedance or admittance happens when you terminate a length of transmission line with a known impedance. go find that equation in a book, and figure out the two cases where the end is terminated in an open circuit, and then a short (...)

## voltage and current source

"v -source like open circuit and hate short circuit i-source like short circuit and hates open circuit" if v-source short burn out batteries by passing large current why i -source should not be in (...)

## Fabrication of a coupled LC resonance circuit

When C3 approaches infinity (high capacitance) it becomes a short , not open. I think there is quite a few things happening in this cct. There will be a series resonance of C1 L1 at about 1.5MHz. There is the parallel resonance of C3 L4 at about 1.88MHz. There are 2 other peaks at 1.2Mhz and 2.3Mhz which are probably from combinations of (...)

## how to control this dimmer with arduino

I am building a LED panel for my aquarium and need to control the dimmer which requires the following criteria : Power ON with dimming: DIM ~ -Vin >2.5 ~ 6VDC or open circuit Power OFF : DIM ~ -Vin < 0.8VDC or short 100 ~ 1KHz 1mA at PWM dimming OFF and 24VDC input can someone guide me on where to (...)

## low-pass vs high-pass filter RC fundamentals

Impedance of capacitor is 1/jwC . At zero frequency , impedance is infinite and at infinite frequency impedance is 0. So capacitor acts as a open circuit at zero frequency and short circuit at infinite frequency. So AC->R->C acts as a low pass filter and AC ->C->R acts as (...)

## LT3652 solar charger - low charging current and hot IC

I am designing and building device that will work outdoor self-powered using solar panel and battery. Solar panel rated 10W gives Im=0.65A (short-circuit) and has power peak at Um=16.8V (21V open-circuit). The VRLA battery from Yuasa is rated 4Ah 12V (13.65V floating). I (...)

## Transient Voltage Suppressor Diode Working

The discussion is based on wrong assumptions, e.g. TVS would fail open circuit. It more likely fails with short circuit, at least at medium overload enery levels.

## need help in reconfigurable antenna.

As far as I know, you can't simulate a pin diode in HFSS. The best you can do is run two different simulations, one with a short circuit and the other with an open circuit. This is just an initial approximation because there are other parasitic effects that you are not simulating.

## Debugging:Open or Short Circuit

modify the circuit that gives AC audio signal and repeat the exercise. May be a broken small toy piono will sufiicient the requirement. Break the speaker or audio crystal unit connection. Attach leads to both ends of this broken connection to test open or short. Ensure that the toy key is in pressed mode in default. if you (...)

## mtline spectre connection

In order to evercome this problem put a zero ohm resistor between two.. Spectre doesn't love something floating,shorted,open circuited etc.

## what are differences between open circuit QHA and short circuit QHA ?

what are differences between open circuit QHA(quadrature helix antenna) and short circuit QHA ?

## Power amplifier class E & F

Class F amp in microwave Design involves a matching network design at the fundamental frequency and load harmonics. The common practice is to present a short circuit at the even order harmonics, and an open circuit at the odd order harmonic. This 2nd and 3rd harmonic is (...)

## push pull vs open drain

You are misinformed. RS-232 is most definitely NOT open-drain

## Weird Multimeter Behavoir???

It is very natural that open probes (connected to DMMs)have induced voltage which the meter reads. Once either you remove the probe from the meter's sockets or short circuit the probes, it would read "zero".

## ABCD Matrix of a Transmission Line Stube

(1)get the input admittance for open or short-circuited transmission line; (2)according to the ABCD-matrix of parallel admittance, get the ABCD-matrix of parallel open/short circuited stub

## Musical jacobs ladder mark 2

Bear in mind that the transformer probably contains a rectifier which could have gone short/open circuit because you are drawing far more current than they are normally rated to carry and also that the transformers internal wiring has to withstand the same voltage that you see as the arc. Consider the (...)

## Using MOSFET as switch to power device

Your circuit involves both drawing and principle design faults. I guess, you meaned to connect the PMOS switch between 24V and VCC pin rather than make it short the power supply, distroying itself. If so, the PMOS switch has to be controlled by a 24V tolerant open drain/open collector (...)

## transformer as balun - even mode behavior

Hello, the picture shows an ideal transformer balun. Normally it shows short circuit behavior to even mode excitation. Is it possible to model open circuit behavior by putting an inifinitely high resistor between the center tap and ground. I am actually wondering because this would be the same as (...)

## design of a circuit to detect an audio signal from audio amplifier???

HI ALL; kindly help me to design a circuit to detect(supervise)the output of audio amplifier. the case is :there is for example 10 speakers concocted to the output of audio amplifier and i need to monitor this line for open circuit or short circuit or amplifier power off . what i (...)

## power supply problem

I cant open circuit. I dont see it now.

## What exactly is Tellegen's theorem?

Take any complex two port passive circuit and compare the open circuit voltage ratio from one side to the inverse short circuit current ratio when driven from the other side and this equality and reciprocity is known as "Tellegen's theorem".

## Why is wired logic connection not allowed in totem-pole configuration?

A totem-pole output can drive the output both high and low. If you connect such outputs together there will be a short circuit if they don't drive the same value. You need open collector outputs or similar to do wired-logic.

## Request: accept xls and/or ods attachment file types

I would like to see xls (Excel spreadsheet) and/or ods (openDocument spreadsheet) added to the list of allowable attachment extensions. Thanks! J Can You reformulate your question I got short circuit in head ? Thanks :wink: You mean on open With... list ? or file associtation on double (...)

## Diode Test by using AVR

hi.I want to have circuit which test diode which is short circuit or open circuit or have no problem and I want make this circuit by AVR. please help me

## Tiny Ohmmeter + some optional extras.

It would be easier to use a ceramic emitter with a current controlled one shot and let it squeal like a metal detector for short circuits and click slowly for leaky circuits and nothing when open circuit.

## surge arrestors and Description CS1-100/230

Always start with a spec. Purpose: Over Voltage transient protection , short circuit to shunt and shutdown for residential AC line, so fast trip fuse or breaker is needed. Failure mode is open circuit after limited number of protections. "CS1-100 surge arrester can work as Class I and (...)