All Questions
508 questions
2
votes
3
answers
167
views
Finding capacitor voltage in this seemingly simple rectifier circuit
I've been experimenting with a simple rectifier circuit and wanted to share some observations. Without R1, the circuit functions as the well-known half-wave rectifier, where the capacitor quickly ...
- 21
6
votes
10
answers
2k
views
Best way to design a PCB for frequent component switching?
I'm getting a PCB made with an OpAmp circuit on it that will need some tuning. We aren't sure what resistance and capacitance values we'll need to use for the integrator circuit. These will need to be ...
0
votes
1
answer
45
views
Selection of the type of resistors and capacitors
I’m currently working on an ArtNet Node project using a Teensy 4.1 and aiming to build a 3 Universe ArtNet Node with Ethernet connectivity.
Since I will be building the circuit on a breadboard I do ...
- 11
3
votes
5
answers
1k
views
What is the difference between using a resistor or a capacitor as current limiter?
Sorry if my question is too basic but I really can't get the idea here. I have this circuit here in which 220 VAC is connected to an optocoupler via these two 120 K resistors results 240 K.
What is ...
0
votes
1
answer
50
views
Why does this high pass filter/rc differentiator behave like this?
Take a look at this circuit below:
If I'm correct, the circuit above is an RC differentiator/high pass filter. However, I do not understand its behavior.
The circuit produces an output like so: (...
- 25
1
vote
1
answer
55
views
RC timing circuit
I'm reading AOE 3rd edition, book say below:
Here’s how the circuit works: the voltage divider R3R4
holds the (−) input at 37% of the supply voltage, in this
case about +1.8 V; let’s call that the “...
- 297
1
vote
1
answer
136
views
How does this delay circuit work?
Just wondering if there is an explanation to how this "delay circuit" works.
(Above screenshot from YouTube video "Fun with Transistors" at timestamp 716s (11m 56s) by HackMeMod)
...
- 21
1
vote
4
answers
142
views
Why does the reciprocal of sum of reciprocals relationship appear commonly?
The relationship of 1/x = 1/x1 + 1/x2 + ... seems to appear rather commonly within engineering.
Off the top of my head, I can think of resistors in parallel, ...
- 25
3
votes
1
answer
76
views
RC series analysis with H parameters model
I'm writing this just to be sure I understood well the process of analysing a circuit with the \$H\$ parameters model. In this case, it is a very simple example of application; the circuit I'm ...
- 87
2
votes
1
answer
306
views
How does this boost converter circuit work?
The circuit appears on this site in
Post #45 by Michal Podmanicky.
It is posted so that I can understand how the circuit works. It is not explained fully in the posted link. How does this circuit ...
- 45
0
votes
2
answers
80
views
Output voltage didn't change after adding capacitors and resistors
I'm building a power supply that consists of a Type-C female to DPI adapter and a LD1117 voltage regulator (on a perfboard/protoboard). I was advised to add capacitors and resistors.
Before adding ...
- 293
2
votes
1
answer
179
views
Step response of a tricky RC circuit
This question was asked in an interview. The circuit is given below.
The initial voltage across the capacitors is 3V each. Need to plot Vx vs time.
My response is given below. But the panel told my ...
- 3,061
1
vote
1
answer
171
views
How do you find the Total Current in an RC circuit with multiple parallel capacitors and resistors?
I’m an Electro-mechanical engineering student and I have this homework problem from our textbook. It lays out the circuit attached and asked to find the current through each capacitor and resistor and ...
- 11
-1
votes
2
answers
85
views
Manufacturer of electronic components
I've a hobby, dissasembly old household appliances. I found this arrangement and i can'f find its datasheet. Does anyone know who manufactured it?
- 11
5
votes
6
answers
3k
views
How can current phase shift be 90 degrees behind voltage just "inside the capacitor" on an RC series circuit but be in phase in the resistor?
Imagine an AC source in series with an RC circuit.
In this video, the instructor claims current will be 90 degrees behind voltage inside the capacitor but not inside the resistor or the whole circuit. ...
- 847
0
votes
0
answers
48
views
How to lengthen the short pulse of a turn signal?
I am trying to upgrade my motorcycle with LED turn signals. The issue is with the particular light I am using and I believe I can solve it with a simple circuit addition. Please excuse any incorrect ...
2
votes
2
answers
139
views
Circuit that turns on an LED and turns it off after some time
I want to create a circuit that turns on an LED when a switch is flipped and automatically turns it off after some time. I use a capacitor for the timedelay.
Because I want it to be able to be reused ...
- 21
4
votes
3
answers
389
views
Why is resistor used in RC circuit?
Why is the resistor used in RC circuit? Is resistor used to oppose the current flow in RC circuit?
3
votes
1
answer
99
views
How do I configure a negative clamper in LTspice?
I am trying to make a negative clamper in LTspice. The pulse source goes from 10V to -10V harmonically. My aim is to lower it's voltage by 7.3V, so it will have a pulse graph going from 2.7 to -17.3V, ...
- 43
2
votes
3
answers
950
views
Amplifying 0.333 Vac signal to 0..3.3 VDC signal: component selection
I am trying to convert a current transformer (60 Hz) signal with an output of 0.333 Vac to a 0..3.3 VDC input signal. I haven't worked on circuits like this in over 10 years so I come seeking wisdom.
...
- 49
0
votes
3
answers
159
views
What are these resistors and capacitors doing in this audio CODEC circuit?
I'm implementing the VS1053 Audio CODEC IC on a PCB design where I will be using it along with a class D amplifier that will connect to a pair of 8 ohm speakers. I'm looking at SparkFun's MP3 Player ...
- 1,207
0
votes
2
answers
340
views
How to analyze an RC circuit with triangle wave voltage input?
I have the following circuit below where I am trying to measure the current through R5. I have parasitic components C1, C2, C3, C4, R2, R3 and R4. I also intentionally added series resistance R1 and ...
- 69
2
votes
0
answers
81
views
Typical load examples for RL and RC series and parallel circuits
I have already learned theoretical description of RL and RC circuits and their behavior. But now with a benefit of hindsight I have never truly learned about typical real world loads that have similar ...
- 119
1
vote
3
answers
313
views
Do I need a resistor in circuit when charging capacitors?
I want to charge a group of capacitors whose total equivalent capacitance is \$ 705 \:\mu F\$ and whose equivalent series resistance is on the order of \$10^{-2} \:\Omega\$. I am trying to charge them ...
- 111
0
votes
3
answers
222
views
Phase difference between voltage across a capacitor and the source in a low pass filter
Consider I have a low pass filter like that in the figure.
simulate this circuit – Schematic created using CircuitLab
I have considered the voltage source to be \$V\$ and the voltage across the ...
- 103
0
votes
2
answers
154
views
Why is the voltage across a capacitor in the Laplace domain equals I(s) / s?
The original transfer function is I(s) over V(s) for a basic circuit that contains a resistor, inductor and a capacitor with a voltage source (Basic RLC circuit) where R is the resistance of the ...
- 155
0
votes
1
answer
199
views
Selecting Balancing Resistors for HV Capacitor Bank
I am constructing a High Voltage (150 kV DC) capacitor bank. I have elected to connect 10 capacitors in series, with 10 such branches connected in parallel. My next mission is to create balancing ...
0
votes
0
answers
54
views
Circuit Analysis: Capacitor voltage surge
I am new to electronics and I am experimenting with falstad circuit simulator to understand how capacitors work with different components. In the below circuit, when the switch is open , the capacitor ...
- 111
0
votes
2
answers
218
views
How is this equation derived for a low pass filter?
How’s the second line of the equation derived from the Kirchhoff law’s equation in the first line?
If then, how was the equation in the third line derived?
I’m very confused by the steps.
- 155
3
votes
1
answer
188
views
Basic questions about circuit diagram [closed]
I'm new to this field, and I found the below circuit online.
My intention is to use it to connect an Arduino to an 8-PIN Yaesu Rotator controller.
My questions are:
What are the parts that I've ...
- 43
0
votes
2
answers
282
views
E series Components and Information
What electronic components are made using the E96 and E24 series?
I couldn't find any sources to learn about the E series. Can you please help me?
- 85
1
vote
0
answers
45
views
RC + DIode Problem
Consider every component to be ideal.
V_in is a square pulse with dc level 0 and amplitude = 10 (Basically square pulse at +-5V)
Find v_out vs time (draw the waveform)
Solution : im not sure whether ...
- 11
0
votes
1
answer
339
views
RC circuit for EDM machine pulsing backwards
I am building a hackaday EDM machine project. Same as picture attached minus the 3D printer board and with a 120 V, 9 Ω setup instead.
I measured my voltages with a multimeter and across my electrodes ...
1
vote
2
answers
240
views
Latching with MOSFET
I am struggling to have the circuit below working on LTspice. Indeed, as I understand it when the switch is pressed the LED should change it's state (turn on if off / turn off if on). The switch is ...
- 11
2
votes
2
answers
88
views
Low frequency asymmetrical led blinking circuit, lacking thermal stability
I'm trying to use a NE555D to achieve a 500ms on, 1500ms off, duty cycle. The exact timing is not that important(+-20%).
But my problem is that when the temperature changes it greatly effects the ...
- 33
1
vote
1
answer
141
views
How can I get the V-I characteristics of negative resistor of Chua diode
I want to simulate the Chua circuit in which a negative resistor is used. I want to simulate the V-I characteristics of Chua diode. But it does not get the same result as shown in book or papers. ...
- 23
0
votes
1
answer
52
views
Help me identify this part in Hitachi CP-X445 projector
I have this old Hitachi CP-X445 projector. And it stopped working. after opening it up I started it and this small thing started smoking and became ashes. What is it? Where can I find it? What is the ...
0
votes
0
answers
461
views
Hacking into an electric hoist using SSR's and an arduino. Why is this happening?
So I've been working on hacking into an electric hoist so I am able to control its movements using my Arduino. My idea was to wire into the remote control that comes with the hoist. The remote control ...
- 1
0
votes
1
answer
117
views
How can I implement Chua diode in LT-Spice
I am simulating Chua circuit but it is not work properly. please help me to find out the region. In this schematic I am using simple diode instead of DIN 914. Actually I don't find this model so ...
- 23
0
votes
0
answers
320
views
How can I download op-amp TL082 model?
I have just started using LTSpice. I need to simulate a Chua circuit with op amps TL082, but I did not find this operational amplifier. The reference paper which I have use that use this third party ...
- 23
0
votes
2
answers
751
views
How to find lossy parallel LC tank Q factor, bandwidth, and half-power-frequency?
Ideal parallel LC tank has infinite impedance at resonance frequency. However, real components, especially inductors, have unignorable ESR, causing ideally infinite impedance dropping to a finite ...
- 623
0
votes
1
answer
102
views
Question on Simetrix [duplicate]
Can someone tell what is the meaning of the circled item in Simetrix for a resistor?
- 945
8
votes
1
answer
1k
views
Why are resistors and capacitors placed in the feedback network of op-amp voltage followers?
I've been looking at a circuit that has an amplifier cascade used in a servo amplifier. In this amplifier cascade, there are blocks to control the gain and blocks to control the roll-off frequency of ...
- 105
0
votes
0
answers
123
views
Capacitor voltage across two different sources
Assume I have a capacitor.
I'd like to know what the voltage across the capacitor would be if I connect two DC sources to its terminals. I performed a simulation but didn't get any understanding.
...
- 945
-1
votes
1
answer
317
views
Triangle wave generation without using op amp
Is there any way where i can generate triangle wave without using op amp but by only using mosfets cap and resistors ?
- 1
0
votes
0
answers
131
views
Bob smith termination - Working
I've seen a couple of questions on Bob-smith termination for Ethernet magnetics.
But I fail to understand why the bob-smith termination is required?
Like, what's the purpose and how does the ...
- 945
3
votes
3
answers
403
views
Necessary components for diy ATMega328
I am trying to build a barebones avr based circuit, based on designs i found on the internet.
My questions are based on this sub-circuit:
I don't plan on using a Reset button, thus S1 will be omitted....
- 1,399
-4
votes
1
answer
127
views
(Solved) How can I power circuits that loop on themselves and do not have an input? [closed]
I found these circuits online:
They are supposed to be the simplest square wave oscillator you can make.
What can I do to actually make them work?
They don't have an input for power and do not have ...
- 11
1
vote
1
answer
608
views
RC delay; more resistance or more capacitance?
Consider the following RC delay circuit, meant to accept short input pulses without triggering, but to trigger on a continuous input:
simulate this circuit – Schematic created using CircuitLab
...
- 592
0
votes
1
answer
192
views
Stabilizing inverter output shift using an RC circuit
I have an MD-40 pump which runs on 230V AC output from an inverter. The pump squeals and stops working properly when the main supply is back after an outage and the inverter output shifts back to the ...
