Questions tagged [tolerance]

A window of acceptance, often expressed as a percentage, in which a non-perfect value is still accepted as usable.

Filter by
Sorted by
Tagged with
1
vote
2answers
128 views

Can an electronic system be built with absolutely no single point of failure?

Is it possible to make an electronic system, where every sub-system is duplicated and absolutely nothing is a single point of failure and if a failure (or multiple failures) occurs the system itself ...
0
votes
2answers
74 views

How to design two circuits with Instrumentation Amplifier to produce the same output?

I want to measure the current in a 5V circuit. The current is between 50uA and 2.5mA. The current is from a NTC and it changes slowly (10Hz measurement is fast enough). Here is the typical ...
1
vote
1answer
105 views

Set the Gain of an Opamp Accurately Using a Potentiometer

I want to set the gain of an opamp accurately using an potentiometer, with low thermal drift and good long-term stability. From what I've read, there are three basic ways of doing it, but none of them ...
0
votes
1answer
44 views

Calculate the differential common-mode gain of instrumentation amplifier

I am trying to design an instrumentation amplifier with a CMRR of 50 dB. I have to target a differential gain of 60 dB. $$ CMRR(dB) = 50 dB = 20log(\frac{A_{vd1}}{A_{cm1}})+ 20log(\frac{A_{vd2}}{A_{...
3
votes
1answer
211 views

What's the DC voltage range typically tolerated by modern smartphones?

The modern USB charging circuitry of mobile phones is pretty sophisticated. For example they can negotiate higher charging voltages etc. This question, inspired by a discussion on worldbuilding, is ...
1
vote
0answers
66 views

What is the impact of Earth's magnetic field polarity on consumer electronics?

Earth's magnetic poles are known to have inverted in the past. How are commonly used circuits or component of consumer electronics (from energy production/transportation to TVs, mobile phones and PCs) ...
0
votes
1answer
56 views

lm35 Temperature Readings are not right after sealing with Hot-melt adhesive (How mush has it Soldering max Temp toleration ?)

I need to seal the LM35 temp sensor so, I used this device for sealing it: The code I have used are: ...
0
votes
2answers
89 views

Inductor size versus tolerance

Say I’m planning to prototype some circuits (filters, oscillators, etc.) by soldering the component leads together in a “hairball” construction. If I use typical 10% or 20% tolerance inductors, how ...
1
vote
1answer
62 views

Decreasing manufacturing variance in analogue designs

I'm designing some modular sensors for my company's internal testing. Most are analogue, with a sensor (PT100, current shunt, pressure transducer etc), some interfacing (REF200 based PT100 circuit for ...
2
votes
2answers
127 views

Question about the accuracy of integrated resistors

I'm studying the implementation of resistors in integrated technology. In particular the books deals with the accuracy of the obtained resistors. It says: Then it says: "We observe that the value of ...
2
votes
3answers
204 views

Does the LT Spice monte carlo simulation definitely output the max and min voltage for any number of simulation runs?

I have the following circuit, in which i need to calculate max and min voltages possible (considering resistor tolerance). Does running a monte carlo simulation consider the absolute max and min ...
5
votes
1answer
200 views

Why so much variance in the continuity beeper threshold? How do these beepers work anyway?

In this answer it is mentioned that the EEVBlog-branded BM235 meter has a threshold of between 30 and 480 ohms for its continuity beeper (as seen on page 25 of the datasheet). My first thought was "...
1
vote
2answers
93 views

choosing crystal when tracks are very close together

This is a circuit I am having trouble with. I made 20 units with the exact same setup. Three units with this setup managed to work with 33pF ceramic caps with 20% tolerance and a crystal from Ebay. ...
1
vote
1answer
185 views

How do I model a resistor array in SPICE?

I am currently building a library of SPICE simulation models that is going to include resistor arrays. These arrays exhibits both absolute tolerances and relative tolerances. Usually, the relative ...
2
votes
1answer
457 views

Forward voltage tolerance on an ordinary diode

If one examines the datasheet of a diode such as the Vishay US1G, there is a graph of the typical voltage vs current such as Figure 3 below (with multiple lines for different temperatures): However, ...
0
votes
2answers
101 views

RTC time advancing

I'm working in some projects with an RTC. I'm using the PCF85063A. The problem is: the RTC counter is advancing from real time about 2 minutes per week. I searched for hardware and firmware errors, ...
0
votes
1answer
43 views

Solar variation tolerance for a solar panel

How to estimate average variation of input solar radiation that would be tolerable for a given solar panel? On what parameters will it depend?
1
vote
1answer
84 views

Meaning of a potentional tolerance value for a dimension in a mechanical drawing

The mechanical drawing below contains two dimensions (2-Ø2.30 and 4-Ø0.92) that I can't make heads or tails of. I have spent quite a while researching mechanical dimensional and tolerance conventions ...
9
votes
3answers
1k views

PCB enclosure tolerances [closed]

I can imagine problems of PCBs not fitting into their enclosures or misaligned screw/hole pairs. Are these type of problems common, especially with the dirt cheap enclosures? I am planning to use one ...
0
votes
0answers
64 views

Circuits that take advantage of tolerances in components

Bit of a wordy question title... I was trying to simulate an astable multivibrator the other night and the simulation refused to run. I eventually realised that because the simulation assumes perfect ...
1
vote
1answer
200 views

Identification of 5 band Resistor from power supply

This Resistor is not functioning The 4th band is Gold, I've read that means it's an exception. The 3rd looks to me as silver, not gray, this is why I've added a picture. I'd like to replace it, so ...
3
votes
2answers
972 views

Confusion with the meaning of a component tolerance in terms of accuracy and standard deviation

As far as I understand a component's tolerance relates the difference between the actual component value and the value given on the data sheet. If a 1k Ohm resistor have ±5% tolerance, is this 5% ...
0
votes
2answers
1k views

Electrolytic Capacitor Tolerances

Recently I went to order a set of these 100uF electrolytic capacitors with 10% tolerance, needed for impedance balance for an audio output. When I noticed they were out of stock, I decided to order a ...
0
votes
2answers
258 views

Why do I read resistance on the continuity setting but not on the resistance setting?

Disclaimer: Newbe A multimeter tutorial on Youtube said that to test my washing machine inlet valve solenoid for continuity I can use either the lowest ohms setting (200 on my DT830B) or the ...
2
votes
4answers
2k views

Jitter in 'ppm' and 'ns'

In many datasheets clock tolerance is in ppm and in some other it is in ns or ps. What is the difference in giving clock tolerance in ppm and ns/ps. How it can be converted from one unit to another?
0
votes
1answer
246 views

What does the tolerance mean for the 0 ohm resistor

What actually is the percentage tolerance if resistor is 0 ohm?
2
votes
1answer
84 views

Should I be conservative about setting the output voltage of the CV phase of Li-Ion charging

Background My application features a Li-Ion battery (NCR18650B) which I'm charging with the standard CC/CV method. Various constraints force me to use a generic buck converter (with current limiter) ...
0
votes
1answer
918 views

Estimating gain tolerance

Estimate the gain tolerance (+/- X%) of the non-inverting amplifier in Fig. 3 assuming that the tolerance is solely determined by the errors in the resistor values. Only resistors involved in the gain ...
0
votes
1answer
38 views

Maximum tolerance for a loop trace-antenna's capacitor

While going through the document at https://www.silabs.com/documents/public/application-notes/AN639.pdf I have read from "Figure 13. Loop Antenna Simulated Mag(Zin) vs. CP1" below that even a 2% ...
0
votes
0answers
40 views

Parameter tolerance estimation with non-pure ratios

I am trying to estimate the exact tolerance of a simple circuit, consisting of an op-amp based, inverting comparator with hysteresis. This is the schematic (electronic-tutorials.ws) For which I ...
26
votes
3answers
2k views

Why are resistors tolerances relative instead of absolute?

Every resistor has a tolerance, this provides the user with an idea of the accuracy of the product. This tolerance is represented by a percentage. This means: a big value resistor will be less ...
4
votes
1answer
4k views

How to calculate aging tolerance of Resistor?

I wanted to calculate the worst case minimum and maximum value of Resistor 1K by considering all the tolerances(initial tolerance,temperature,environmental factors and aging). Here is the link for ...
1
vote
3answers
199 views

Cheap precision sense resistor

I need a precision low value sense resistor to make current measurements e.g. 10R 0.01R. Looking for precise resistors e.g. Vishay, show that these are expensive e.g. $35 for a single 0.001-0.005% ...
2
votes
2answers
586 views

What is life tolerance of a resistor?

Is anyone familiar with the term "life tolerance of a resistor" ? I could not find a good read in google. Any link with the explanation will be sufficient.
0
votes
0answers
88 views

Capacitor tolerance at high frequencies

I was measuring a 10pF 0603 +-5% (Johanson 251R14S100JV4S) using a network analyzer at 319.5MHz. The cap came in their high q/low ESR ceramic kit. It measured about 10.7pF. But after measuring a few ...
0
votes
1answer
39 views

Constant current circuitry tolerance dependency

I have the below given circuitry. The circuit provides ( 12 - 3.3 = 8.7 V) 8.7 V / R3 of current. My specific question: What is the effect of PNP transistor on the variation of current? Until ...
1
vote
1answer
146 views

How many bins can I code using a resistor on an ADC

I have a device that can have different things plugged into it. I'm trying to use a resistor on these things to uniquely identify the thing. That is, if I plug in Thing A, I can read the resistance as ...
0
votes
3answers
70 views

How much can a power brick safely vary from what the device it's used with expects? [duplicate]

How much can a power brick safely vary from what the device it's used with expects? As an example, let's say I have a device that needs an AC=>DC power brick. The device expects 19V/1.58A, but the ...
4
votes
6answers
1k views

What is the (most likely) technical reason behind temperature specifications?

Im talking about electronic devices, which may be handheld or similar, so nothing exposed to "artificial" temperature (welding, soldering, cooling with liquid gas). Devices designed to be operated by (...
2
votes
2answers
616 views

Component has a x% tolerance: What does this mean exactly?

All components have specification tolerances and ranges. Some examples are:- Resistor 1% Electrolytic capacitor 20% Zener diode breakdown voltage 5% Clearly it kinda indicates that the ...
1
vote
1answer
341 views

What capacitor types perfom best for large-value signal path applications?

Most signal path/timing capacitors are of stable types such as film or C0G ceramic. However, size and cost force an upper limit on this -- C0G caps out at 10-100nF, while film caps can manage up to 1-...
0
votes
1answer
402 views

Problem with accuracy of AD633 multiplier

I have 3pcs of AD633 chips, and the accuracy should be ±1% (typical), ±2% (max) according to datasheet. I wired it like this: I tried several input voltages, but it seems, that output is still way ...
16
votes
2answers
1k views

4-bit bus address selection via analog input pin: Monte Carlo simulation shows overlapping address values

I designed a small sensor PCB for my master thesis with an ATtiny44 microcontroller. I need about 200 of these boards for my application and 16 are always locally connected to controller board. The ...
1
vote
2answers
926 views

Transformer tolerances?

How much can a transformer go without a failure? For example, let's say that a transformer is designed to work with 500mA. (obviously you should avoid exceeding this limit) But as I learned with ...
4
votes
5answers
2k views

Rules for choosing power rating of a resistor

Let's say we're designing a system, and within it we have some resistor \$R\$ with a voltage difference \$V\$ across its terminals. Then it dissipates power \$P = V^2 / R \$. Of course the resistor ...
34
votes
8answers
8k views

Are two (or N) resistors in series more precise than one big resistor?

Let's say I have one 2 kΩ resistor with 5% tolerance. If I replace it with two 1 kΩ resistors with 5% tolerance, will resulting tolerance go up, down, or remain unchanged? I'm bad with ...
0
votes
2answers
493 views

Total Tolerance of an Electonic Circuit

I am trying to evaluate a circuit with a lot of parts given their associated tolerances and I'm really struggling. For the electronic parts with 2% tolerance I am guessing the values are to ...
6
votes
6answers
1k views

Statistical accuracy of multiple resistors in series or parallel

I'm having a senior moment and would appreciate clarity. I'm working on an inverting amplifier design where I need to add low-pass filtering and a voltage clamp. Without the filtering and clamp, the ...
0
votes
2answers
557 views

Replace Tight Capacitors for Better Tolerance?

There are some capacitors (10 \micro F and 4.7 \micro F) which are limiting my development of Raspberry Pi Hats because they are provided only with tolerance of 10% or greater. It seems that the ...
1
vote
2answers
134 views

Do photodiodes have tolerances?

Below is the beginning schematic for a circuit I'm working on. We have a previous revision of that product (Rev A), and two sets of recent product (Rev B1 and B2). Rev B1 was made 2 weeks prior to Rev ...