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Questions tagged [loading-effect]

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Am I correct in solving this Loading in Voltage-Voltage Feedback

The following circuit is from Chapter 13 of Analog Design Essentials written by Willy Sansen. Calculate \$R_{out}\$ for this circuit. Break close loop with loading effect. $$ (V_{in} - V_X) g_{m1} +...
kile's user avatar
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1 answer
240 views

How can I break the feedback loop network and add loading effect

Here is the circuit schematic. Consider Loading effect in feedback and break the loop. Simplify the circuit. $$A_{v,open} = \frac{V_{out}}{V_{in}} = -\frac{g_{m1} R_F R_D} {R_S +R_F}$$ Calculate \$...
kile's user avatar
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1 vote
1 answer
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Choosing isolation resistor for Op-amp output

I want to choose an accurate value for an isolation resistor for my OP-AMP (OPA838). Based on the datasheet, the OPA838 is very sensitive to capacitive loads and needs an isolation resistor added to ...
Andromeda's user avatar
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1 answer
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Why is there a shift in cutoff frequencies of filters, and how to fix it?

I am doing a project where I am designing my own EEG circuit. I aim to keep it fairly simple and essentially design my circuit to do two things: Amplification Filtering I want to design the circuit (...
Soumil Gupta's user avatar
1 vote
2 answers
211 views

How can I describe the loading effect of an ohmmeter?

How can I describe the loading effect in an ohmmeter? I've been given an assignment with this question, and I tried to look it up on the internet but could find no other material apart from loading ...
Prabhat Sharma's user avatar
1 vote
1 answer
77 views

Measurement of resistance of the Earth

From "Learning the Art of Electronics" by T. Hayes and P. Horowitz (Cambridge University Press, 2016): If we attempt to use a digital multimeter to measure the resistance between A and B, ...
Frost's user avatar
  • 105
2 votes
1 answer
194 views

Why is the frequency response from my 1X and 10X probe seem to be converging with increasing frequency?

I'm a Mechanical Engineer trying to get into electronics so please excuse my lack of understanding. I'm feeding a 5.0 Vpp sine wave into my SDS 1202X-E scope from my signal generator (see image below)....
user351001's user avatar
2 votes
3 answers
1k views

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 ...
Clerni's user avatar
  • 153
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1 answer
1k views

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 ...
yolt's user avatar
  • 113
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1 answer
147 views

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. ...
Muhammad Sarmad Afzal's user avatar
1 vote
1 answer
288 views

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 ...
Muhammad Sarmad Afzal's user avatar
0 votes
1 answer
86 views

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 ...
user733606's user avatar
1 vote
2 answers
293 views

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 ...
kanoo's user avatar
  • 89
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0 answers
74 views

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 ...
Sam Shurp 's user avatar
0 votes
1 answer
278 views

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 ...
BigRedMachine's user avatar
2 votes
3 answers
2k views

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 ...
Vinit Shandilya's user avatar
5 votes
5 answers
2k views

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. ...
Himmel's user avatar
  • 81
1 vote
3 answers
12k views

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 ...
Devansh Mittal's user avatar
1 vote
1 answer
1k views

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 ...
CRMFL's user avatar
  • 11
2 votes
3 answers
285 views

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 ...
Jay's user avatar
  • 359
2 votes
1 answer
509 views

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 ...
Noisemaker's user avatar
-2 votes
1 answer
2k views

Improving the linearity of a potentiometer after loading

I could not understand why is adding 'Rlin' in the second figure improves the linearity of the system? A little help pls!
Hilton Khadka's user avatar
-2 votes
2 answers
4k views

Electrically loaded resistive Potentiometer!

According to my course book, Potentiometers produce a linear output as a function of displacement, provided that the potentiometer is not electrically loaded!, what is electrically loaded???, mean in ...
Hilton Khadka's user avatar
3 votes
2 answers
1k views

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 ...
Michael George's user avatar