Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »
Q&A

General Q&A about the design and function of electronic systems, electric power systems and infrastructure, their theory, and tools specific to those fields. Read these guidelines before posting.

Filters (None)
42%
+1 −2
Critically damped oscillation issue

I have a question about this circuit:(critically damped oscillation) For a critically damped oscillation for a series RLC circuit the equation of current has this form I(t)=D1te^(-at)+D2e^(-at) ...

2 answers  ·  posted 2y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

42%
+1 −2
Series RLC circuit

How to find the equation of current of the RLC circuit after the switch is moved?

1 answer  ·  posted 2y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

44%
+2 −3
Parallel RLC circuit

How to find the equation of voltage of the top common node of R1,L1 and C1 after the switch is moved?

1 answer  ·  posted 2y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

57%
+2 −1
2 bit subtractor using full subtractor

Can we make a n-bit subtractor using full subtractors or if we want do subtract one binary from another we must use full adders and use the complement of the 2nd number to do the subtraction? I ha...

1 answer  ·  posted 2y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

60%
+1 −0
Division of binary numbers logic circuit

If we want to divide two numbers I have problem implementing this logic.I am posting 1 images with 2 different steps to the solution. In example a) the most significant digits of the divident >...

2 answers  ·  posted 2y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

71%
+3 −0
3+3 doesn’t show 6

I have a problem which I don’t understand how to solve. I have this 2-bit adder, but when I select A1AO to be (11)2 3 and B1BO to be (11)2 3 and run it on Logisim it doesn’t show me 6. Instead it s...

2 answers  ·  posted 2y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

37%
+1 −3
Bandwidth of serial signal

Suppose we have this stream of data.Let's assume the data stream lasts 1 sec. How do we find the bandwidth of the data?Do we Fourier transform the signal in order to find its components in the ...

1 answer  ·  posted 2y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

20%
+0 −6
Need help design a digital circuit which divides two binary numbers [closed]

Before the circuit here are the digital blocks which have been already designed and exist as part of the division block 1 bit subtractor: 2 bit subtractor(in the digital block diagram of the di...

0 answers  ·  posted 1y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

66%
+2 −0
Design rules for opamp bootstrapping

Here is the bootstrapping technique for opamps, as exposed in the Art of Electronics:. This technique is supposed to increase considerably the input impedance of the opamp for an AC input source (...

2 answers  ·  posted 3y ago by coquelicot‭  ·  edited 4mo ago by Lorenzo Donati‭

66%
+2 −0
What is dynamic resistance? Is it related to differential resistance or to incremental resistance?

What is the concept behind the dynamic resistance that often pops up when dealing with non-linear components and the circuits in which they are employed? Is the concept related to other terms like...

1 answer  ·  posted 4mo ago by Lorenzo Donati‭  ·  last activity 4mo ago by Lorenzo Donati‭

80%
+6 −0
What is this fourth connection in NMOS device?

I know that in transistors there is base, collector and emitter, and in FETs there is gate, drain and source, but what is the fourth grounded connection opposite the gate in this NMOS circuit?

1 answer  ·  posted 1y ago by NMOS lover‭  ·  edited 4mo ago by Lorenzo Donati‭

75%
+4 −0
Battery protection circuit

I am using two 18650 cells in series to power a RC car. Is the voltage goes below 6.2 V, the battery should be disconnected to prevent over discharging the battery. At the same time I want to imple...

2 answers  ·  posted 1y ago by Stefan‭  ·  edited 4mo ago by Lorenzo Donati‭

66%
+2 −0
Why do I need electrodes for ECG measurements?

When recording an ECG signal, the raw signal is taken from the body and sent into an ECG amplifier to amplify the signal to a suitable range and remove common mode and other types of noise. Measur...

1 answer  ·  posted 6mo ago by Carl‭  ·  edited 4mo ago by Lorenzo Donati‭

22%
+0 −5
Designing a circuit to verify thevenin theorem with induction motor as load [closed]

Design a suitable experiment and an AC circuit to verify Thevenin's theorem when the load is a single-phase induction motor with a capacitive start and two supplies feed the load. Ratings of load:...

0 answers  ·  posted 1y ago by dkumar94600‭  ·  edited 4mo ago by Lorenzo Donati‭

72%
+6 −1
Mysterious little cases hanging on street wirings in India

I have been observing these little cases hanging to the wires from a long time. They are almost everywhere here in India, but I was unable to find out what they are. I am not sure whether they are...

3 answers  ·  posted 1y ago by aditya98‭  ·  edited 4mo ago by Lorenzo Donati‭

66%
+2 −0
Circuit which create ac sine wave from dc pulsed signal

A full wave rectifier converts a sine wave to DC pulsed signal of double frequency. Is there a circuit which does the reverse process?

2 answers  ·  posted 1y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

AC DC
33%
+1 −4
What Sine-Wave Oscillator can be controlled with a microcontroller?

I need a Sine Wave Oscillator circuit that can allow me to control its frequency with a microcontroller. Until now all the topologies that I have found if the frequency is changed, a change in the ...

2 answers  ·  posted 11mo ago by deleted user  ·  edited 4mo ago by Lorenzo Donati‭

70%
+5 −1
Duty cycle of buck-boost converter

I have the following problem: - Using Wikipedia I find that during CCM we have the relation: - $$\frac{V_{out}}{V_{in}} = -\frac{D}{1-D} $$Solving for $D$ and inserting values gives me $$D...

2 answers  ·  posted 1y ago by Carl‭  ·  edited 4mo ago by Lorenzo Donati‭

77%
+5 −0
Buck-boost converter fed from split input supply

I have recently finished designing a buck-boost converter for a job that uses a split (+/-) input power supply. Load power is taken equally from both positive and negative input supplies and, the ...

1 answer  ·  posted 1y ago by Andy aka‭  ·  edited 4mo ago by Lorenzo Donati‭

28%
+0 −3
Electromagnetic induction

If I connect a battery to an LC tank and then to an antenna and then on the other side at a distance x, I connect an antenna to another LC tank and this to a diode and this to an LED, Do a I have a...

1 answer  ·  posted 2y ago by Voyager ll universe probe‭  ·  edited 4mo ago by Lorenzo Donati‭

71%
+3 −0
Level shifting of a 3 state logic pin

I want to design a simple battery charger using MCP73831/2. This chip has a 3-State state pin according to the table below: I have a 3.3V MCU and I want to connect this pin to a GPIO. The MCU is...

1 answer  ·  posted 1y ago by dekker‭  ·  edited 4mo ago by Lorenzo Donati‭

71%
+3 −0
SDR SDRAM PCB Timing Budget

I am working on routing a microprocessor to two identical single data rate (SDR) SDRAM chips that are PC166 compliant, particularly Alliance AS4C16M16SB-6TIN. The 16 bit SDRAM chips are combined t...

1 answer  ·  posted 6mo ago by DavidE‭  ·  edited 4mo ago by Lorenzo Donati‭

75%
+4 −0
4-Layer PCB Routing Question

I am designing a 4-layer PCB that has both analog and digital circuitry throughout it. The analog section involves high return currents as well as ADCs sampling the voltage across sense resistors a...

1 answer  ·  posted 3y ago by jm567‭  ·  edited 4mo ago by Lorenzo Donati‭

71%
+3 −0
Bypass Caps and High Frequency Current Return Path

I was watching this video by w2aew on the function of ceramic bypass capacitors, and at 6:00 he states that high-frequency currents take the path of least-impedance and make their way to the power ...

1 answer  ·  posted 3y ago by jm567‭  ·  edited 4mo ago by Lorenzo Donati‭

50%
+1 −1
What is the role of the differential amplifier in a delta sigma converter?

A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs. Based on this scheme the differential amplifier is substrac...

1 answer  ·  posted 3y ago by Pacifist‭  ·  edited 4mo ago by Lorenzo Donati‭

57%
+2 −1
ESD Protection - Differential Amplifier

More about the circuit The circuit is sensing (low side sensing for many reasons) current used to power up the lights with 28V(part of the schematics not shown here -> relay with LC filter ...

3 answers  ·  posted 3y ago by 2kind‭  ·  edited 4mo ago by Lorenzo Donati‭

70%
+5 −1
How Relay inrush current limiter works?

In this circuit below the relay circuit part is acting as an inrush current limiter, but I can't understand how it works since the current is flowing in both conditions where the relay is open or c...

1 answer  ·  posted 10mo ago by deleted user  ·  edited 4mo ago by Lorenzo Donati‭

66%
+2 −0
How to change the polarity of an input using a single switch?

I have an mcu pin and I want to sense a voltage up to 24V to 36V. I want to connect some outputs on the board I'm designing and I don't know whether those outputs will provide a voltage or will be...

1 answer  ·  posted 6mo ago by DeadMouse‭  ·  edited 4mo ago by Lorenzo Donati‭

75%
+4 −0
What is the difference between rise/fall time and Turn-On/off Delay Time?

Hi guys so recently i was looking for a mosfet and a gate drivers and between a lot of their specification the rise/fall time and Turn-On/off Delay Time sometime it called propagation. My question...

2 answers  ·  posted 1y ago by deleted user  ·  edited 4mo ago by Lorenzo Donati‭

66%
+2 −0
Diode like a frequency mixer

Based on this paper on Wiki a diode can be described as a frequency mixer due to the exponential relationship between current and voltage.What I don't get from which point to which point do we meas...

1 answer  ·  posted 2y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

66%
+2 −0
Diodes used in mixers

Suppose we have this circuit which is supposed to be an unbalanced frequency mixer. But how does the diode generate a signal with new frequencies at the output?

2 answers  ·  posted 2y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

50%
+0 −0
How do "O-ring circuit" differ from an "ORing circuit" or "OR-ing circuit", or are they synonyms? [closed]

I've seen a few different circuits (a) (b) (c) (d) described as "an O-ring circuit" or "an optimal O-ring circuit". What does the "O" and the "ring" refer to in such circuits? How do "O-ring circ...

0 answers  ·  posted 2y ago by DavidCary‭  ·  edited 4mo ago by Lorenzo Donati‭

25%
+1 −7
Identification of semiconducting electrical components

We identify semiconducting electrical components this way: The first digit represents the number of pn junctions inside the semiconducting device The two or more digit number starting at position...

1 answer  ·  posted 1y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

60%
+1 −0
Adding resistance to varactor circuit

If we a varactor and we want to control let's say the resonant frequency of the circuit ,in my schematic we must add R1 correct?Else we create a low resistance path for current to flow not through ...

2 answers  ·  posted 2y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

77%
+5 −0
What should be considered when picking a flyback diode?

Which are the parameters I should looking for when picking a flyback diode to be placed across a generic coil, such as a relay? That is: a coil with plain on/off functionality, for example a 24VDC ...

2 answers  ·  posted 3y ago by Lundin‭  ·  edited 4mo ago by Lorenzo Donati‭

77%
+5 −0
Is it possible to use two zener diodes in series back to back to replace a diac?

I've accidentally burnt my dimmer with a short. It is a common dimmer with a triac/diac/pot of the simplest configuration (the triac is a BTA16). After replacing the triac, this still does not work...

2 answers  ·  posted 3y ago by coquelicot‭  ·  edited 4mo ago by Lorenzo Donati‭

71%
+3 −0
Amplifier compensation with added resistor across opamp input terminals

This application note from Linear Technology discusses oscillations in opamp circuits and some compensation schemes. One method discussed for reducing phase shifts in the loop gain due to the RC ne...

1 answer  ·  posted 3y ago by rpm_2718‭  ·  edited 4mo ago by Lorenzo Donati‭

66%
+2 −0
How do I calculate and manipulate the inductance and capacitance of outputs to a connector on a PCB?

I am designing a PCB that has to have class 1 div 1 associated apparatus (only the outputs to the sensor) certification. Essentially, I am using a boost converter to convert the voltage from a lith...

2 answers  ·  posted 3y ago by Hawk2020‭  ·  edited 4mo ago by Lorenzo Donati‭

75%
+4 −0
Chokes, Beads and Inductors in Pi-filters

I have seen pi-filters using chokes, ferrite-beads, and plain inductors as the L-element What are the main differences between them? when use one or other?

1 answer  ·  posted 3y ago by zeke‭  ·  edited 4mo ago by Lorenzo Donati‭

75%
+4 −0
Is a BJT 3-transistor Wilson mirror faster than a simple mirror?

My question is trying to understand if there is an effect on the switching time, on both turn-on and turn-off, between the following configurations. A mirror set up to switch a current, and there ...

1 answer  ·  posted 3y ago by Pete W‭  ·  edited 4mo ago by Lorenzo Donati‭

57%
+2 −1
How building a follower satisfying rather extreme requirements.

What is your best suggestion for building a follower that would ideally satisfy the following spec: frequency: from 100 Hz (or lower) to 1 GHz input signal impedance: 1 Mohm input signal ampli...

1 answer  ·  posted 2y ago by coquelicot‭  ·  edited 4mo ago by Lorenzo Donati‭

71%
+3 −0
Thévenins Theorem for Transistor Circuit

I am calculating the base current of transistor Q1. To simplify the circuit equations, I applied the Thévenin's theorem twice and converted V1, R1 and R2 into Vth and Rth, as shown in the image. ...

2 answers  ·  posted 1y ago by kadamrohan16‭  ·  edited 4mo ago by Lorenzo Donati‭

83%
+8 −0
Technique to reset pulse transformer core quickly

I am analysing a pulse transformer which is required to transfer below communication protocol pulse from primary to the secondary side. The pulse duration is 32 μs and off time available to reset t...

2 answers  ·  posted 1y ago by kadamrohan16‭  ·  edited 4mo ago by Lorenzo Donati‭

77%
+5 −0
PNP Darlington pair as a current limiter

I am trying to analyse what is controlling the load current in the below Darlington configuration. Is it the base current of transistor Q3 which is controlling current through R14 / emitter curr...

1 answer  ·  posted 2y ago by kadamrohan16‭  ·  edited 4mo ago by Lorenzo Donati‭

71%
+3 −0
LED with a parallel resistor

It is common to have a series resistor to limit the current trough an LED. I saw a circuit using the LED driver: stp16cpc26. but instead having the series resistor, they are in parallel. This LED...

1 answer  ·  posted 3y ago by zeke‭  ·  edited 4mo ago by Lorenzo Donati‭

71%
+3 −0
Name of this current limiting device

I'm trying to modify a LED torch, and there is a DC-DC booster (1.5 V to 3.3 V) and after that some SOT-23 device which (I assume) keeps constant 90 mA current through LED. I know I could remove th...

2 answers  ·  posted 3y ago by Chupacabras‭  ·  edited 4mo ago by Lorenzo Donati‭

71%
+3 −0
Purpose of emitter resistor in a common collector amplifier

I see a lot of common collector amplifiers with the output taken across an emitter resistor. What is the purpose of doing it this way instead of connecting your load directly to the emitter? I sh...

4 answers  ·  posted 3y ago by jm567‭  ·  edited 4mo ago by Lorenzo Donati‭

66%
+2 −0
Select resistor for a diode

Suppose we have this circuit How do I pick a appropriate value for the resistor R1?

3 answers  ·  posted 2y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭

33%
+1 −4
Floating circuitry and diodes

In both cases, is the "X" point floating when there is no 12V applied ?

1 answer  ·  posted 5mo ago by kellogs‭  ·  edited 4mo ago by Lorenzo Donati‭

50%
+0 −0
Modelling tunnel diode relaxation oscillator

I have been trying to model this oscillator I was wondering if we can somehow predict the frequency of the oscillations.For small currents inside a diode from the Shockley diode equation $$ e^{x...

1 answer  ·  posted 1y ago by MissMulan‭  ·  edited 4mo ago by Lorenzo Donati‭