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2
votes
2answers
48 views
XLAMP MK-R by Cree power source
I was wanting to use the MK-R for a project of mine but after consulting the datasheet I burned up my first 10$ LED and wasn't sure why.
I had an LDO providing 11.5V anode to cathode via gator ...
0
votes
3answers
95 views
Does a ground fault compromise the whole circuit?
(this image taken from http://www.allaboutcircuits.com/vol_1/chpt_3/3.html)
Based on this picture, would a tree across the bottom wire of the circuit (the solid wire, not the dashed wire ...
6
votes
1answer
92 views
What are the things to notice before actually connecting a PWM motor circuit?
I have simulated a PWM motor control circuit in Proteus, now I want to bring it to life and connect a circuit in real world.
Here's my PWM circuit in Proteus:
And the code:
...
0
votes
3answers
133 views
electric chewing gum prank circuit diagram
I'm new to electronics.
I'm trying to find out how this works out of curiosity.
http://www.amazon.com/gp/aw/d/B0050UNNQS
Does anyone have a circuit diagram for the circuit?
Is the current safe for ...
-2
votes
1answer
54 views
I'm looking to create a simple circuit of flashing christmas lights to music and need help [closed]
I'm not trying to do anything fancy, just get the intensity of the lights to synchronize with the music. I'm currently looking at using a tip31 transistor, about 50' of LED lights, and an aux cable to ...
-3
votes
0answers
22 views
ATtiny861 Proteus VSM [closed]
Anybody have ATtiny861 ISIS design for Proteus VSM?
I'm new to circuit design. I need to test is for FemtoOS.
2
votes
4answers
97 views
Widely available IC for encording and Decoding DTMF data
I am planning to do some research in data transmission over the air. For this I am interested in DTMF encoding and decoding.
Is there a widely available IC to achieve this? A circuit diagram using ...
0
votes
3answers
36 views
Op Amp operating conditions
We all know that, there are two assumptions that can be made whe analysing ideal operational amplifers, which are:
V+ = V-
I+ = I- = 0 (no current flows through op amp inputs)
but my question is: ...
-6
votes
0answers
33 views
Simple adder circuit [closed]
Design the following circuit within the listed constraints:
Circuit must accept input from two BCD rotary switches, assume range is 0-9.
When a pushbutton is pressed the sum of the numbers should be ...
2
votes
1answer
38 views
Finding the total energy of the network in steady state
i got a network below in steady state im trying to find the energy in the network by the capacitors and inductors.
simulate this circuit – Schematic created using CircuitLab
My attempt ...
0
votes
3answers
85 views
Thevenin equivalent of a circuit
I'm trying to solve this problem, and i seem to be unable to solve it, part of the reason being that the there is a dependent current source in here, so I can't find the Thevenin equivalent resistance ...
0
votes
1answer
46 views
Showing three functions with Decoder 3-8
I`m trying to show 3 function with 3-8 decoder with only OR gates.
The following functions are:
F1 = A'BC' + AB'C' + ABC
F2 = A'B'C' + A'BC
F3 = ABC + AB'C' + A'BC' + A'BC
so what I did is:
I ...
2
votes
2answers
127 views
Is this electrical circuit solvable?
I am trying to solve a circuit with two current sources.
I1, I2, V1, V2 are known.
R1, R2, R3 are unknown.
I've tried node analysis, but I can only come up with two equations
\$\dfrac{V_2}{R_1} + ...
0
votes
1answer
51 views
Signal of mobile network [closed]
Hi i want to have a circuit design for amplifying the mobile phone signal as at my place where i live the signal is very weak. or show me a site where it can help me please.
-1
votes
0answers
62 views
Good introductory Book to Circuits [closed]
I have recently bought a breadboard and some components because I am interested in how basic circuits are designed and work. I know essentially nothing about circuits and was proud of myself when I ...
0
votes
0answers
112 views
How can I close the circuit on a string of christmas lights cut in half [closed]
I need to take a 25 foot long Christmas light string and cut it into a 3rd of its size so I can have an 8 foot string. I have already cut the end with the male plug to 8 feet, and I'm now having ...
0
votes
0answers
52 views
Small-signal input and output resistances of the circuit
I am given this circuit:
And I am trying to determine the small-signal input and output resistances.
I was either given or found all the following info for the circuit:
VA = 110V
β = 115
T = ...
-4
votes
1answer
52 views
How can I get the frequency dependent voltage gain of non-inverting amplifier circuit with transimpedance amplifier? [closed]
I couldn't find any circuit drawing also formulas itself. How can I find or construct it?
0
votes
1answer
56 views
Help With Paper Calculation for Peak Rectifier Design Problem
I am tasked with designing a circuit for the following particulars:
A peak rectifier will be used as part of a DC power supply to supply an average DC output voltage of 15V, with maximum +/- 1V ...
0
votes
2answers
136 views
Is it possible to provide power using (effectively) a single wire?
I come to this question after a few thoughts on capacitors.
A capacitor essentially transfers (and stores) energy using an electric field through an insulator. The plates of a capacitor are not ...
1
vote
2answers
47 views
Constructing an Encoder
I understand an Encoder is 2^n input lines and n output lines`.
I want to construct an Encoder from scratch so I can understand how it works, so that I can construct any other Encoder in the future.
...
0
votes
1answer
84 views
Binary to Gray Code
I have built this 3-bit Binary to Gray Code circuit. I would like to know if it is correct.
I have used 2 Xor gates.
3
votes
1answer
46 views
Replacing LED with Flashing LED in a circuit
I am currently building a FRED Photopopper but instead of using flashing LED can I use normal LED? I don't get what is the difference between these two in the circuit. If the FLED cannot be replaced, ...
0
votes
2answers
66 views
How to find τ in these circuits?
I know that \$τ = \frac{L}{R}\$, but what is \$R\$ in this formula? It seems to be the total resistance, but how to find it in the schematics?
-2
votes
0answers
49 views
How Much Do You Think It Cost To Manufacture Bitcoin ASICs? [closed]
I have for a while heard about GPU/Parallelized Bitcoin mining, but one thing I didn't know of until recently was Bitcoin mining ASICs. I read a bit into it, and one of the CEOs of the startup ASIC ...
2
votes
2answers
135 views
Making an obstruction avoiding device without microcontroller
I want to make a toy device which spins to the left whenever there is an obstruction in front of it, without any microcontroller. Can anybody please check whether my approach in building the device is ...
0
votes
1answer
54 views
Turn S R Latch Using a NOR gates into NAND
I can't post a picture so the question will use Boolean Algebra. For me an SR Latch is
S NOR Q' = Q
R NOR Q = Q'
I will represent Q' as P since Q' might be ...
2
votes
3answers
126 views
How does this blinking circuit with op-amp work?
Can somebody explain how this circuit works?
The OP tries to make the same voltage at the input cables.
At first, the LED is on. Therefore we have a low voltage (maybe 1V) on the negative input
...
-4
votes
0answers
66 views
Circuit Board Design Process [closed]
How is a circuit board designed to the specifications of a silicon chip that will be handling radio frequency signals of up to 3GHz?
2
votes
1answer
45 views
VCF with resonance
I've found this circuit in the LM13700 datasheet. I wonder how can I add resonance? I assume I need to add a feedback network and an op amp buffer. I've read that some synth VCFs sport a band-pass ...
1
vote
0answers
45 views
Coupled LC Resonator in MATLAB
I am designing a dual-mode resonator with the following Circuit Model and Frequency Response!
ADS Circuit Model:
Frequency Response:
I need help with the modelling of my circuit model in ...
0
votes
0answers
68 views
Electronic AC surge protection - modify circuit
I was asked for help with designing an electronic AC overvoltage protection. My buddy was able to design this so far:
However he has no more time for this project and I would like to finish it. He ...
2
votes
2answers
140 views
Should I design with “N” parts or newer parts?
I noticed there are parts with "N" in the part name, for example the 1N4148 diode and the 2N2222 transistor, etc. What is the history of these parts? Where did they come from and why do they have ...
-3
votes
0answers
68 views
Circuit diagram needed for a basic single tuner satellite receiver [closed]
I'm doing a design project, and wondered if someone could help me.
Basically what I need is a circuit diagram for a single tuner satellite receiver. I tried looking on the internet, but I'm given all ...
-3
votes
0answers
59 views
Receivers - Only give out one output, so how do hotels do it? [closed]
I need a bit of guidance. I understand that receivers can only give out one output, and if you connect, lets say, multiple radio or TV's to the same receiver, you will get the same programme/station, ...
1
vote
1answer
78 views
AC DC Analysis of diode
in the following circuit:
Im looking to find what \$v_D(t)\$ is given \$V_γ = 0.7 V\$ and \$r_f = 0\$.
Now when doing the DC analysis, find that \$VDQ = 0.7 V.\$
But im having trouble finding ...
2
votes
0answers
25 views
Open source software for schematics [duplicate]
I am looking for an open source (or just free) software for creating electric schemes. It would be better if your program could do other schematics (for instance, installation schemes of physical ...
2
votes
3answers
135 views
What do you use a board like this for?
I'll start by saying that I'm a software guy, I know literally nothing about electronics.
I recently bought a raspberry pi, and while browsing at my local electronics shop, saw this board for $5.
...
6
votes
3answers
257 views
How does this circuit diagram work?
I don't understand this circuit diagram here, but I'm sure that you can help me out.
I'll explain what I have figured out so far.
EDIT: It's a metronome circuit. Sorry for being unclear about that.
...
1
vote
1answer
86 views
Reason for certain steps in Circuit Analysis
The image is from this lecture.The instructor Prof. Shanthi Pavan says that the part encircled in orange can be replaced by a voltage source with current through \$v_1\$ as \$i_1\$ and not \$i_1 + ...
-9
votes
1answer
80 views
Circuit Diagram Controller [closed]
I want to make a circuit diagram which will:
Read the speed of a servo
Divide the speed of servo
With the result of the division will be controlled the speed of an other motor like this: Servo ...
2
votes
1answer
80 views
How to escape redundant stated when using J-K Flip Flops?
I've designed a counter using three J-K flip flops, but I have two redundant states. How can I ensure that the system has a way to escape these states if they occur?
I've tried searching for help on ...
0
votes
1answer
42 views
The Conjugate Match
I've been deriving transmission line theory from scratch, out of curiosity, and I'm a bit hung up on one seemingly insignificant point.
When determining the real power drop on a reactive load with a ...
-1
votes
2answers
146 views
threshold problem on a Schmitt trigger op amp
I have the Schmitt trigger op amp on the below diagram. (channel A & B refers the oscilloscope probes on the following figures).
The resistor values are selected to set the trigger threshold as ...
0
votes
1answer
57 views
1-pole and 2-pole DC circuit breaker
My question is rather simple, when and why do one use a 1-pole or 2-pole circuit breaker in DC (+24VDC and GND)?
3
votes
2answers
144 views
Circuit version of a simple if else program
I have written a simple program that controls two motors (outputs) each with two states ( positive, negative) with an Arduino. The motors states based on the status of four buttons (inputs) (Up, Down, ...
0
votes
2answers
29 views
GEDA - cannot edit attributes
I'm trying to design a circuit in GEDA/Gschem in Ubuntu. I could insert new components in the circuit but I cannot in the name change or add values. For instance when opening the window for ...
2
votes
1answer
88 views
connection from an comparator to an optocoupler
I have the circuit below to decode a signal that is defined as Logic high >9.5 V and Logic low <6 V
To determine the ...
-2
votes
1answer
72 views
How is burden measured? [closed]
How is burden measured for the secondary circuit of either a current transformer or potential transformer and is there a test set made for measuring burden?
2
votes
1answer
86 views
Voltage drop from poor connection
In a DC circuit, why does an open circuit voltage drop appear across a bad connection?
For example i have 48vdc wires where a connector is charred from bouncing/bad contact. Under no load the side of ...
