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0
votes
1answer
65 views

Whether Internal source resistance will have effect on the circuit

Calculate the voltage gain for the network of Fig. 3.12 if the source has an internal resistance of 100 in series with Vi.Vi=500mV,R= 1K ? For this problem I had tried a solution but I am not ...
0
votes
1answer
36 views

Can source transformation be used to internal circuit (source) while finding thevenin equivalent of the source?

At first, I'm very sorry because I don't have money for circuit lab so there is not much visual circuit that clarify my steps I have practiced source-transformation as well as Thevenin equivalent ...
1
vote
4answers
75 views

Current Source Circuit Internal Impedance

So I've been learning about current source circuits - this one in particular. I'm told that an ideal current source should give out the current no matter what happens to the load. But it should also ...
1
vote
2answers
69 views

Problem with a circuit of an controlled variable voltage source

I have this circuit, it should regulate the output voltage between 15V and 0V. But the output I get when I simulate it is between 2V and 3V, and when I implemented, I burned zener diode 1N4734A. ...
0
votes
0answers
31 views

How does the impedance of the source effect the positive sequence impedance measurements of distance relays?

How does the impedance of the source effect the positive sequence measurements of distance relays in relation to power system protection? I wrote that increasing the source impedance decreases the ...
0
votes
1answer
68 views

PSpice OrCAD Adding Diode and Unknown Source

On the PSPice OrCAD, how do you add a diode with a 0.7V forward bias and a unknown voltage source?
0
votes
2answers
84 views

Could we remove the resistor in parallel with voltage source or in series with current source?

Although this question have been asked. But I want to ask again. I still doubt about it. It is written in "Electric Circuits (9th Edition) by James W. Nilsson, Susan Riedel". And if we remove it, I ...
1
vote
2answers
71 views

Does source transformation in circuit analysis work the other way around?

We all know that the source transformation shown in the first picture below is valid. But does it also work in reverse, as shown in the second picture? (because I use proteus to draw second picture, ...
-1
votes
1answer
59 views

Which Clock Would Run Faster [closed]

I have two identical clocks: one is plugged into 120 VAC @ 60 Hz. The other is running on a 12 volt battery. Which would run faster, and more importantly, WHY? Based on my understanding of a quartz ...
0
votes
2answers
53 views

Short the circuit of a voltage controlled voltage source when finding out the v(t) for \$t>0\$

Question Find v(t) for t<0 and t>0 in the circuit below. Solution My Question Why we can see the voltage controlled voltage source as a shorted circuit when finding the v(t) for ...
0
votes
1answer
34 views

Current of a circuit with regulator

When the specification of a regulator says that output is 1A for example the whole current of the circuit will be 1A? For example I have a regulator in series with a 100Ω resistor and a 7V source.The ...
2
votes
1answer
134 views

Operational amplifier circuit with one ac and one dc voltage source

The following circuit contains ideal operational amplifier, Vs voltage is sinusoidal with amplitude of 1Volt and frequency of 1kHz, where VE is a dc voltage of 2Volts. I am trying to use ...
3
votes
2answers
668 views

0 to 2A variable current source circuit

I'm trying to build a 0 to 2A variable current source following the Linear app note. Here's the schematic: The circuit is a difference amplifier (LT1995) providing gain to the voltage developed ...
1
vote
2answers
2k views

Connecting Switches to Hidden Supply Pins in Proteus ISIS

I am currently working on a simple circuit involving logic gates in Proteus ISIS from Labcenter. By default, the power pins are hidden. You can access them by right-clicking the component, selecting ...
2
votes
1answer
178 views

Maximum current, maximum voltage

Given that 0 <= R <= ∞ in the circuit shown, consider these two observations: Observation 1: When \$R = 2\Omega\$ then \$v_R = 4V\$ and \$i_R = 2A\$. Observation 2: When \$R = ...
0
votes
0answers
26 views

CFL and CCFL difference: Can I use CFL balast like CCFL inverter?

I want to ask where is the difference in CFL (compact fluorescent lamp) and CCFL (cold cathode fluorescent light) in the meaning of thier elctrical circuit. I know it's two different types of ...
-1
votes
2answers
100 views

Connecting a 10V variable source across a load (without ground) [closed]

I have a problem. I am a second year Electrical Engineering student. But the problem I experienced is from first level electronics (for which I could not find a solution). I have been recently ...
1
vote
2answers
172 views

0-12V Adjustable Home Made DC Source not working [closed]

I have a home made dc source that is made a few years ago. Solders at the back of the board are very bad so I can not track the connections very good. But it's circuit diagram is very similar to the ...
0
votes
1answer
78 views

Expressing the current through a dependent voltage source

Consider the circuit below: The task is to find the node voltages V1, V2 and V3 (labelled 1, 2 and 3 above). In order to solve the problem I apply the node voltage method; summing all the currents ...
0
votes
1answer
70 views

Calculating currents with a current source in series

Is this circuit correct? I am not sure if I can consider I5 as a current source. I remember that current sources cannot be in series. Or is this as easy as it looks. Specifically I am getting ...
0
votes
2answers
66 views

Current and voltage sources

What happens when a current source is connected in series with a voltage source? I mean to ask, what will the current be through the series combination and voltage across it? Is it allowed to make ...
4
votes
2answers
630 views

Logic gate using current source and diodes

This circuit is supposed to work as a logic gate. I need to find out the logic operation it performs. Suppose the diodes are ideal. https://www.circuitlab.com/circuit/egg3wh/logicgate/ ...
0
votes
1answer
238 views

Low voltage/current power supply for wide range of inputs

I was thinking of simple low voltage/current power supply that can accept wide range of input voltages, up to the hundreds. Let's say, the input is 20 to 160V DC and output has to be 10V with 20ma ...
2
votes
1answer
291 views

current controlled current source

Objective I am trying to build a gain-of-1 current controlled current source (current mirror) that is less sensitive to resistor value variation. The designs i have been making are highly resister ...
4
votes
2answers
846 views

Driving Relay Board with Shift Register (Shift vs Sink)

I am trying to drive some ebay bought 8 channel relay boards. They are pretty simple, have a launchpad or arduino toggle a pin and the board turns on. However, I need to use a shift register with ...
0
votes
3answers
488 views

Use transistor to auto swap power source

Basically I'm looking to use a simple transistor circuit to diconnect one V+ (or ground) when another is connected and automatically switch back when the switching source is removed. Like having a ...
5
votes
3answers
641 views

Purpose of these two transistors

Hi does anybody know what's the purpose of the Q1 and Q2 transistors, sounds to me like they are constant current sources. Am I wrong? Could somebody explain me the purpose of those Q1 and Q2 ...
2
votes
1answer
388 views

Converting a battery powered pocket heater into a portable 5V power source

I bought the attached pocket heater. The elevated element seems to be heater spirals so the red cables seem to lead to short circuit - capable circuitry. Background: So I built this tight case for ...
5
votes
3answers
279 views

Capacitor discharge and 1/2 terminal voltage sources

I understand that this is really basics of electronics, but I would really appreciate if somebody clearly explained following question. So here is a small set of questions related to similar topic: ...
4
votes
1answer
254 views

Understanding a transistor configuration

I started watching this video series on a DIY lab power supply by Dave @ EEVBlog. On his video he's analyzing mostly simple constant current circuit. However, at the top of the circuit there's two ...
1
vote
2answers
579 views

Current source with pulse option

I am seeking a very fast (10nsec rise time) transistor based fixed current source that I can use with my CPU. The CPU will use the GPIO to turn on or off the current source. This will be used to ...