This tag is nearly useless. Consider using more specific tags to narrow your question down.
-2
votes
1answer
14 views
protection circuit for pins of a DAQ dvice
I saw some methods to protect arduino. but if we use a solution for protecting the pins (using resistor and zener diode based on the figure) which can provide 5 v to circuit. how can we calculate the ...
0
votes
0answers
28 views
Rectifier input impedance does not change when load changes
I simulated a fullwave rectifier with LTSpice. When I change load resiter or smoothing capacitor and even both. Input impedance of the rectifier is still same. Any idea why is that?
Calculated ...
0
votes
0answers
24 views
Locating a wideband LNA at high frequency
I'm looking for an LNA from 1-6GHz or 1-2.5GHz and tunable with a 12MHz bandwidth, but they dont seem to exist, is there a reason for this?
-3
votes
0answers
33 views
Pulse Generation [on hold]
I want to generate a pulse output with minimum rise time of 50 ns and fall time of 200ns. I have a square input with rise time 1.5 us and fall time 10us. How to generate this output. Can someone ...
2
votes
1answer
51 views
Basic 100 Blue LED Decoration Circuit Design
I have 100 blue diffused LEDs that I want to use (not necessarily all of them) to make some kind of circuit that would likely just crawl over my wall like some vine growth coming down from the ceiling ...
1
vote
1answer
76 views
How do I replace a capacitor with a resistance?
I'm studying Fourier transformations, and their relationship with electrical circuits. In the example below the capacitor is replaced by a resistance, in that way we can use the voltage-divider ...
0
votes
1answer
46 views
Basic Question : RC circuit why Vc node vary like this ?
Follow are two figures. The first one is basic AZ circuit and autozeroed signal, which is a simple RC circuit with a switch. The second figure is about the voltage shows in the first one.
...
0
votes
1answer
65 views
Implementing this Full Adder circuit
For my class, I have to implement the following circuit on a breadboard but I don't really have an idea on how to start. Basically, I have a 4-bit Full Adder and I will input two 4-bit binary numbers ...
-1
votes
2answers
60 views
What is h-bridge function? [on hold]
What is h-bridge and what is it used for ? is it a kide of connection that can be done using any components or it just can be implemented by only special component
help please.
-3
votes
1answer
39 views
How to keep the electronic circuit from affecting the value of input? [on hold]
I'm making a circuit to flash a high power led and it keeps dragging the input signal down by the amount it goes up every time.. I would like for suggestions as to what kinds of circuits or electronic ...
0
votes
2answers
47 views
Zener diode as a Voltage regulator, where do the formulas come from?
I'm currently studying the above circuit and trying gain a better understanding of it, I found the following forumlas to calculate Rs Max and Rs Min:
$$R_Smax = R_L(\frac{V_{in}}{V_z}-1)$$
Which I ...
-3
votes
0answers
34 views
Ultrasonic sensor [on hold]
I have this sensor
datasheet
And I search enyone, who can make circute for measure the distance.
Who can help me?
0
votes
0answers
10 views
T-Circuit Model of a Transformer for 3 Coils
I just recently studied about the T-Equivalent circuit model and was wondering what happens when maybe more than one coil is wound on the core.
How does the equivalent circuit look then ? Is it just ...
0
votes
1answer
52 views
Output of diode clamper circuit for a sinusoidal wave input
I have seen a common explanations of clamper circuit shows in figure and have doubt in that. Here is the two explanation:
As RC >> time period, the capacitor charges immediately within no time to ...
0
votes
1answer
80 views
After installing capacitor, circuit is not working anymore
In order to eliminate potential voltage spikes from my wall charger, I added a 6,3V 220µF capacitor to my circuit. A very simplified drawing is below:
However after installing the capacitor, I am ...
-6
votes
1answer
52 views
Can i use 6volt relay to control 0.5HP AC motor?
I want to make an ir remote control swith to on or off our 0.5HP motor and I have 6 volt relays i want use in this circuit but I'm scared about relay that it may damage becouse of high power supply ...
1
vote
2answers
105 views
How is the current induced in this circuit?
Rectangle FBCE is the conducting wire. The circle is where magnetic field exists.The perimeter of the circle is NOT a conducting wire. R1,R2,...are different resistances.
If the magnetic field(B) ...
0
votes
0answers
33 views
When analysing a circuit through graph theory can you repeat vertices when forming the tree?
I initially thought that relying heavily on the definition of a Hamiltonian path, vertices could only be visited once when constructing the tree. However, I have stumbled upon an example in which that ...
-2
votes
1answer
57 views
A resistor circuit that resitance of resistor is controlled by single-frequency oscillator [closed]
This is actually more of a fun idea, but:
is there any resistor circuit such that resistor's resistance value is controlled by a single-frequency oscillator? So resistor's resitance varies by the ...
1
vote
1answer
46 views
Flashing a light when a circuit breaks
My electrical knowledge is limiting to say the least. I'm trying to build something, DIY style, to teach myself. It's very simple, let's say I have a circuit and an LED. As long as the circuit is ...
2
votes
4answers
109 views
Water Level Sensor Circuit
I am in need of help for designing water level controller with discrete components, when I use dc for the sensing the probes are getting corroded.. I want to eliminate the corrosion completely.. Using ...
25
votes
2answers
3k views
A PCB for a Drone
I'm making a drone, and would love if somebody can review my work on the PCB layout.
Image (red is top, blue is bottom, circles indicate holes and side transfers purple is glue):
What is supposed ...
-6
votes
0answers
85 views
My first PCB, can someone look over it? [duplicate]
I'm making a drone, and would love if somebody can review my work on the PCB schematic.
PCBWeb file:https://www.dropbox.com/s/xieocjc3di2yrdk/droneboard.cad?dl=0
What is supposed to happen:
input ...
3
votes
7answers
244 views
AC: Why differentiate between Ground and Neutral?
Current flows through a conductor connecting points at different potentials.
Leaving aside multi-phase details, common/conventional AC systems use a 3-wire setup:
Wire-1: a line/live/hot/phase wire ...
0
votes
1answer
36 views
Simple Circuits- negative voltage vs current flow
Say I have a voltage source of -5V. Does the fact that the voltage is negative impact which way the current flows? It seems like a silly question because from what i've already researched I don't ...
-1
votes
1answer
38 views
As a voltage source voltage increases, how does the internal resistance increase?
As title says, supposes that maximum voltage of AC voltage source, or just voltage of DC voltage source, increases, because voltage source equipment is changed. What happens to internal resistance of ...
0
votes
1answer
28 views
How can a signal backfeed and create a crosstalk in a passive summation circuit?
...a passive summation circuit can be a simple way to
combine signals but one disadvantage is that the summed signal will
backfeed into each of the sources. This could be an issue if you
...
-1
votes
1answer
45 views
Adding reverse polarity protection to battery discharge circuit
I'll open with a caveat - I have zero training in the field but I do like tinkering. I'll try to make my question as specific as possible but do forgive if info is missing at this stage!
First of ...
2
votes
1answer
41 views
AC circuit analyse
I have to find all currents in the circuit.
What I got so far is:
$$Z_1 = wl_2 j - \frac{j}{wC_2} = j \Omega$$
$$Z_2 = wl_1 j = j \Omega$$
$$Z_3 = R + wl_3 j - \frac{j}{wC_3} = 2 \Omega$$
$$i_{g_1} = ...
0
votes
2answers
100 views
How to get an output of 100V from a 3.3 V pulse waveform?
We have a problem when trying to drive a piezo transducer(the output of microcontroller is a 3.3V pulse, but the piezo works around 100V-300V, so we have to convert the 3.3V pulse to 100V pulse).
...
1
vote
2answers
88 views
Building smps- pwm isssues
I'm trying to build a smps for a capstone project and am having trouble with the pwm portion of the circuit. When I'm simulating the buck portion it works with 18V dc-400kHZ-43% duty cycle. Now that I ...
1
vote
1answer
61 views
Control one circuit from a separate circuit
What I am trying to do today is control one circuit using another, with no common ground or voltage between the two circuits. Basically what I am looking for is some way to have my Arduino, powered ...
0
votes
5answers
86 views
what happens when voltage is in indeterminate region?
For example, 0 is ground or 0 volts and 1 is VDD or 5 volts
what happens if the voltage is 4.99 volts? or 3.2 volts?
Is it 0 or a 1??!?
0
votes
3answers
52 views
Circuit broken alarm light
I am using an incandescent light bulb as a heating element in an old freezer to keep my glues and finishes from becoming ruined due to extreme cold ( I live in Alaska where we experience -40 ...
2
votes
0answers
84 views
Why do I feel 'electricity' when bridging my macbook and a double insulated charger? [migrated]
Let me set the scene:
Macbook with metal case plugged into the wall with 3 pronged plug
iPhone is plugged into an iPad charger with 2 prongs
When I touch both my iPhone and the case of my macbook ...
2
votes
0answers
54 views
Transfer function and bode plot of an op-amp circuit
Given is a op-amp circuit which has to be solved using the nullor model to find the transfer function as shown below:
Using the nullor model of an ideal op-amp I tried to find the transfer function ...
-1
votes
2answers
64 views
Ideal Operational Amplifier excercise
Having an ideal operational amplifier on the circuit below, i need to find the power at R3. Can you help me? Isn't it 0? I couldn't find anything similar on my books.
0
votes
0answers
37 views
implement a circuit checks majority of ones over a number
I need to design a circuit that compares the number of 1's to another number.
We have two variables; n and ...
0
votes
2answers
89 views
Morse sender and receiver for line transmission
Looking for a DC circuit to be used for Morse transmission in scouts. Visible elements: one, preferably two, buzzers (or lamps, i.e. LEDs) and a button (station A), connected with no more than two ...
0
votes
1answer
83 views
Can anyone please explain how this Zener diode circuit works?
I am learning how a Zener diode works.
Can anyone please explain me how to analyze this circuit (with equation if possible)?
Thanks.
-1
votes
0answers
58 views
What is the best capacitor for oscillator circuit working at 20.000000 MHz
I am making an oscillator circuit working at 20.000000 MHz.
The IC (NJU6321) needs 0.1uF capacitors.
What is the best capacitor for this application?
For example, mica, tantalum...
or which brand?
-1
votes
2answers
82 views
Right half zero in boost converters [closed]
When we increase the duty cycle in boost converters, why does the output voltage first decrease and then increase. After the time associated with the right half zero has elapsed then output voltage ...
0
votes
1answer
59 views
Connecting Solid State Relays To AC Heating Elements - Is this circuit correct?
I'm converting a 1500W toaster to a reflow oven with PID control, but I'd like to focus on the hardware aspect.
I've pulled the switches and controls out of the oven and I'm left with something like ...
-1
votes
0answers
71 views
Op-amp circuit problem - input impedance and its components
I need help in solving this op-amp problem.
For the circuit on picture (op-amp properties:IN impedance is infinite, OUT impedance is equal to zero) determine the input impedance and discuss the ...
0
votes
0answers
17 views
Mesh current method is my solution correct
I have to find i(t) in the figure.
we have e=10 cos10t V which is converted to 10<0 , j=2cos10t converted to phasors to 2<0
R= 2 Ohm, C=0.05 F converted to -2j and L= 0.2 H converted to 2j
...
1
vote
2answers
115 views
Audio Grade Capacitors - Marketing Hype or Better Technology
I have been reading a lot about audio grade capacitors lately, and I cannot find very good information about them. I have read many posts from different sites saying that audio grade capacitors are ...
0
votes
2answers
74 views
Combining resistors in series with a voltage source in between
Am I allowed to combine the resistor R and coil Xl as if they were right next to each other? I want to make this into a current generator, without many transformations.
2
votes
2answers
296 views
How to ensure the two schematic diagrams are equivalent?
I've tried copying the schematic diagram of a typical circuit from the datasheet, but I'd like to ensure the correctness of each connection. Is there a way to somehow match one schematic diagram ...
0
votes
0answers
82 views
Mathematical relation between these two signals
What is the relation between V4 and V3 ? I don't know what to do with diodes. This is not a homework, I need to find the equation between V4 and V3 for my own project. diodes are 1n4001 and the opamp ...
0
votes
2answers
46 views
Help building acceleration detection device/circuit for my bike
I want to build a device using an accelerometer. Press a button after a bike ride and have a light turn on if during the journey I managed to attain a certain acceleration.
Thinking of using some ...
