Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [loading-effect]

17 questions
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Capacitance Measurement With Oscilloscope

simulate this circuit – Schematic created using CircuitLab I'm trying to determine the capacitance of a sensor, but the oscilloscope's internal capacitance is loading the measurement too much. What is an appropriate method to determine a low…
Himmel
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What is the effect of heavy loads on the electrical grid?

When our neighbors turns on a motor, a bulb in our home turns off for a very very short time and then it turns on again. It is something like a quick flash but a man eye can notice it. Would you tell me why that happens, please? What could be the…
Michael George
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Loading effect of an op-amp as inverting amplifier

I have the following circuit, with an electret microphone and a TL082 op-amp: I was asked to calculate the load effect of the amplifier. However, I don't understand: I thought that the whole point of op-amps was that they had a very low output…
Clerni
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Loading effects of a signal source

I'm reading "The Art of Electronics" (3rd edition) by Paul Horowitz and Winfield Hill. In the 2nd chapter on BJT (page No. 79, section Emitter follower). The author says: ".. In general, the loading effect of the following stage causes a …
Vinit Shandilya
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Audio - How does I/O impedance affect the device?

Last year I was experimenting with a design for an audio distortion to be used on line level musical instruments (+4dBu with Zout 100-600Ω by my findings) without the knowledge of impedance, its importance, and how to "use" it. After learning of…
Jay
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Can I "duplicate" a stereo signal to 5 channels? Are there any impedance issues?

A friend of mine has an old 5.1 audio system. The amplifier of the system has 5 cables as inputs to be connected to the audio source. My friend actually uses some cable splitters to send the stereo channel to each one of the 5 channels (yes, it's…
Noisemaker
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Does the burden resistance at the output of a current sensor (either Hall effect or current) represent the output impedance of the sensor?

I need to measure current though a sensor and feed it to the ADC of a micro-controller. The ADC input voltage range does not match the sensor's output voltage range. I searched and found that op-amps solve this problem. However, I need to know the…
Muhammad Sarmad Afzal
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Stick-Slip Piezo Linear Stage Driver - Prevent the Load from Changing Driver Output?

I am currently trying to develop a circuit that generates ramp waveforms to control the motion of a piezo linear stage. Specifically, two waveforms need to be possible to output: a slow ~250us upward ramp with a near-instant downward drop and; a…
kanoo
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Converting PWM to analog voltage

I need to convert a PWM signal with varying duty cycle from the arduino to an analog voltage from 0-5V. I used a RC filter with a time period of 3.9ms. The PWM output has a period of 2ms. I experienced loading effect at the output and therefore I…
Devansh Mittal
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Question regarding operation of a pulse generator circuit with 3 transistors (exercise 2.3 art of electronics)

The exercise 2.3 in 3rd ed. of Art of Electronics asks: what is the output voltage during the pulse? I've replicated the circuit diagram from the book below (in circuitlab.com). I'd be grateful if someone could read my interpretation below and…
CRMFL
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How to know if an opamp can drive capacitive loads?

There has been a lot of questions about how to stablise opamp circuits driving capacitive loads. However, I know there are some op amps that are designed to drive capacitive loads but I am struggling to find the search filter criteria to narrow down…
yolt
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How can I eliminate the paralleling effect of ADC input impedance at the output of sensor sense resistor?

I am using a sensor that gives 5V output However, the ADC I am using can sense only a 3.3V at absolute maximum. A very simple way of translating a 5V to 3.3V was to use a voltage divider as shown. However, the resistor R2 comes in parallel with ADC…
Muhammad Sarmad Afzal
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How to reduce loading of JTAG lines by USB UART bridge using shared signals

I have a USB to TTL (UART bridge) that is connected permanently to a custom board with an ARM MCU. The UART lines are shared with the JTAG programming lines. The problem is that even without any activity on the UART, the presence of the USB to TTL…
user733606
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Fan speed slows down, the moment a new load is added

I am using a rectifier, and 4500uF capacitor to reduce the ripple. After connecting to the power source (60Hz, 120V), I was able to turn on the fan. The issue occurs when I turn the switch on to power the other load. Below is the schematic. After…
Sam Shurp
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Cascaded RC Bandpass filter loading problem?

So I calculated the Highpass stage output impedance to be 22kohm and the input impedance of the Lowpass stage is 430kohm when f=5khz, still in the output I am getting half of my supply voltage despite the input impedance of the second stage being…
BigRedMachine
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