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1
vote
0answers
27 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
124 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
205 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
74 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
65 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
52 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
38 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
112 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
39 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
120 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
26 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 ...
1
vote
1answer
66 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 ...
-6
votes
0answers
51 views
3 bit counter using d flip flops [closed]
i need to design a 3 bit counter that will increment and decrement a stored value by a 3 bit value depending on the positive edges of a signal C. Must use 3 D flip-flops. any help would be appreciated ...
-2
votes
1answer
67 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?
1
vote
1answer
73 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 ...
3
votes
2answers
68 views
Heat Activated Alarm
I am working on a project in which I have to simulate a heat activated alarm. I have attached two images. One of which is a Proteus circuit image that i have made. When i start its simulation the ...
1
vote
1answer
74 views
increasing output voltage of a schmitt trigger op amp
I have the Schmitt trigger circuit below that I read the output as 1.6V for the logic High. I wonder how can I increase the output voltage of the comparator below without changing the threshold of the ...
0
votes
0answers
41 views
Loading effect problem
i m trying to connect a de sauty's bridge(AC bridge) output to a precision rectifier. The problem is the output of the bridge (AC bridge) changes drastically to 5volts as soon as the connection is ...
2
votes
1answer
94 views
How to build “two power sources” in a microcontroller circuit?
My circuit has a microcontroller, it uses power from a DC transformer (120V to 12V DC). My circuit also control an pneumatic valve which also use 12V DC. Almost every time when the pneumatic valve ...
2
votes
3answers
127 views
Help with designing a circuit with logic gates
I want to build a circuit with the following design:
3 inputs
1 NOT gate
2 AND gates
1 OR gate
This is my truth table:
...
7
votes
2answers
163 views
How to analyze this diode circuit?
I am trying to analyze this simple diode circuit by hand, but I can't seem to get too far.
simulate this circuit – Schematic created using CircuitLab
Using circuit lab, it is evident ...
0
votes
1answer
54 views
Questions about RD snubber circuits
I am not too familiar with designing snubber circuits.
Can somebody sanity check the following sizing calculation for a snubber circuit?
Also: Is the undampened rise rime of the voltage due to the ...
2
votes
2answers
94 views
XML schema for electric circuits
Is there any XML schema to describe electric/electronic circuits? I am thinking of something like a netlist, but using XML markup.
-4
votes
0answers
42 views
How can you hook up a Motorola power circuit to another motherboard? [closed]
I have a Motorola razr v, power circuits. I wanted to know, how can you hook up a Motorola power circuit to another motherboard. So it can power and charge the motherboard. How can this be done?
1
vote
2answers
78 views
Mosfet Circuits Voltage
So let's take a simple cmos circuit like this:
So I get that for DC analysis \$V_G = 12 \frac{R_2}{R_1+R_2} \$ and then \$ V_{GS} \$ makes sense to me...because there is a constant \$ V_G \$ value ...
1
vote
3answers
83 views
Economical thermocouple amplifier circuit
I'm looking for the most economical circuit that reasonably accurate circuit for amplifying the voltage produced by a thermocouple (so it can be read by an ADC). For the sake of argument, component ...
1
vote
3answers
97 views
Simple RC circuit with diode question
I was trying to understand this circuit under DC conditions , but can someone explain to me why the voltage across the capacitor is 8.1v i cant seem to understand .This voltage however does go down ...
-1
votes
1answer
67 views
How involved is tapping power from a device to add LED's?
I am thinking about doing a little hobby project (if it proves to be not so difficult) and I am not exactly sure where to start. Macintosh computers have an illuminated Apple logo, and there is a ...
3
votes
3answers
108 views
Diodes in parallel
I need to protect about 5A @ 6V from something stupid like my revering the battery wires when connecting them to the circuit. I thought that I could use 5x 1A diodes in parallel, but it seems that I ...
1
vote
2answers
134 views
Problems when sharing a battery between motors and radio in an RC car
Background
I am building an RC Car that I am trying to modify to control from an Android phone.
When I connect the remote control module as well as the car circuitry (servo & motor) to separate ...
-3
votes
1answer
55 views
Calculating the voltage across the capacitor and the energy lost in an RC circuit [closed]
A circuit is shown in the figure above with \$R = 22 \Omega \$ and \$C = 10 \mu F.\$
The switch \$S_{1}\$ is closed at \$t = 0\$. The initial voltage across the capacitor is \$V_{co}.\$
What is the ...
0
votes
4answers
112 views
How input current affects circuit? Is it ignored?
All the examples I have seen so far, take the input voltage as-is and start calculating circuit current depending on on-board resistors using ohm's law etc.
Can you just ignore the original current ...
-9
votes
0answers
42 views
Need circuit diagram for train station alert? [closed]
I would like to design a bus stop Alert use transmitter and Receiver?
So i need this project circuit?
2
votes
1answer
105 views
Calculation of cutoff frequency in larger circuit
I'm having some difficulties choosing appropriate resistors and capacitors to get specific cutoff frequencies. I guess it's because I'm just considering the single pole components rather then the ...
1
vote
0answers
73 views
How to properly turn off a Raspberry Pi when instant plug-out is a criteria [duplicate]
I want to create a stand-alone internet radio device. Therefore I want to use an existing subwoofer box with connected speakers. Inside the subwoofer box there is the electronics for the sound system. ...
1
vote
4answers
138 views
Why we need clock pulse in sequential circuits?
I need to know why do we need clock pulse in sequential circuits but not in combinational circuits?
-3
votes
2answers
95 views
where to begin learning PC board designing [closed]
can someone please guide the correct path to learn board designing for computers. being specific i am just keen to design a SBC(single board computer) just for hobby purposes my current knowledge is ...
4
votes
1answer
99 views
Is it possible to control and reverse the direction of a dc motor through a headphone socket?
Yesterday, I found that it was possible to control a servo using a headphone socket with a fairly simple circuit.
I've got a project where I need to to control a dc motor via a headphone socket. Is ...
3
votes
1answer
223 views
Single power supply replacement for LM741 op amp?
I'm trying to build a twin-T oscillator for synthesising drum sounds. The LM741 heats up pretty quickly and the circuit hardly oscillates even when the feedback is at 100 per cent. Even with an LM386 ...
2
votes
1answer
115 views
Q-Point of a circuit
In a BJT or MOSFET circuit we have this curve:
What is that q-point? From my research I have the following information:
The operating point of a device, also known as bias point or quiescent ...
4
votes
1answer
69 views
Is it possible to make a multi-display adapter as an independent project?
I've been looking at the Matrox DualHead2Go, which is essentially the best/easiest way to go about using dual monitors for a MacBook Pro. Some people suggest using a USB to VGA or HDMI - but obviously ...
0
votes
1answer
65 views
24-bit parallel TFT module on circuit designed for 16-bit parallel
I've designed a circuit that connects a 16-bit parallel LCD TFT module to the SPI-connector on a RPi, but bigger TFT modules often have 24-bit parallel. Can I use a 24-bit parallel TFT with my circuit ...
1
vote
2answers
105 views
What makes these simple circuit diagrams different?
I'm kind of confused with the behavior changes of these 3 differences of a flip flop.
I made an image to easily show what I'm asking about. I circled the differences in red.. Heres the image:
For ...
2
votes
1answer
90 views
Why does my D Flip Flop Circuit have an X output?
I'm working on one of my projects and I'm having trouble with my flip flops. The project is to design the circuit for a gas pump that has a handle and a sensor. When the handle is down, the pump ...
1
vote
2answers
155 views
How to measure capacitance without LC meter?
I would like to use capacitors salvaged from old electronics, but I currently don't have a LC meter.
What would be some really simple circuits, that would convert capacitance to something I can ...
0
votes
3answers
112 views
Serial and parallel circuits and power
If I have 12V of power, and wanted to power LEDs with a forward voltage of 2V, could I only power 6 of them? Would I connect the cathode of one to the anode of the next, creating a kind of serial ...
1
vote
2answers
124 views
How to justify that op-amp 1 has negative feedback?
Op-amp 1 is topmost in the schematic below. I used the ideal amplifier method (using A until the end and then lim A->infinity) and also the virtual short method.
But I don't know if that's enough to ...
4
votes
2answers
237 views
Simple vending machine circuit
As a homework assignment, I was given to design a simple vending machine circuit as follows
Receives 5 cent, and 10 cent one at at time.
20 cent per snack, gives change when necessary (IE, 25 cents, ...
0
votes
2answers
177 views
Given a gated SR latch, How do I make it a set dominant gated SR latch?
Another weirdly worded question in my digital logic book. It doesn't specifically define set-dominant or reset-dominant - nor does it show how to use these in practice with drawing circuit diagrams. ...
