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3
votes
2answers
35 views

Picking source resistance for impedance matching

I am trying to drive a piezoelectric transducer with maximum power transfer possible with minimum possible noise. In order to do that I am trying to implement LC matching circuit such as circuit ...
1
vote
1answer
59 views

DAC controlled constant current source

Was given the task of creating the simplest constant current source that can supply up to 50 mA with an ~700 ohm load. I can use any IC's out there. I stumbled across the chip here from linear tech: ...
0
votes
2answers
87 views

How to convert the Voltage source into a Current source

I'm confused about how to convert the voltage source into a current source so that I can derive a NAM equation. I've looked around for help but most of it tended to be of simple examples where the ...
0
votes
1answer
11 views

Sound fader control source select

I'm trying to add second source to an amplifier. It uses TEA6320t sound fader control chip which takes in multiple sources and outputs one. The source selector selects one of 4 stereo inputs or ...
3
votes
4answers
55 views

I do not completely understand the intuition behind equivalent sources used in source transformations

My book states that two circuits can be considered equivalent if they produce the same voltage and current in any resistor connected to the two ends of the circuit. The book then goes about proving ...
-2
votes
2answers
82 views

Need to obtain a 1mV signal

I have a 5V power source. For one of my op amps (LM358) I need a 1mV reference voltage as i am comparing it against a sensor input (greater than 1mV). This will allow LM358 to allow my Vcc voltage to ...
0
votes
2answers
52 views

Noise source in orcad pspice

I have a certain circuit and I want to see its ac performance when I send in certain noise as a signal. is there some option like noise source similar to sine etc signals in orcad.... I can make my ...
0
votes
1answer
52 views

Amplifier IC - selecting input (Sound Card/Phone jack) and output(Headphones/RCA)

Good evening guys! I'm trying to figure out the solution to my problem, that I have encountered, but I just can't find anything close. So, first of all, the situation: I'm trying to build an 5.1 ...
1
vote
1answer
50 views

Replacing Ideal current source in two-stage opamp

I am now investigating on replacing the ideal current source with the circuit similar to the one attached below. Why would the mosfet M16 be connected to drain of M12 ? I am confused about how the ...
0
votes
2answers
45 views

N channel mosfet gate-source pin distance

I bought a mosfet said to be rated 600V/5A, yet the gate and source pin are very close together (4,5 mm or something close to that). I've been told 230V traces on a PCB should be at the very least 6 ...
0
votes
1answer
198 views

1 Device, 2 Power sources?

I was curious about this. I've searched other similar questions but they weren't quite the same. One mentioned the use of diodes but I would like to know if this would work first before adding ...
1
vote
1answer
33 views

Thevenin Impedance for network with only dependent sources

If a network has only dependent sources, you need to use a test current source or test voltage source (1v, 1a, something simple) since Zth = Voc/Isc doesn't work. Is it valid to use a DC source as a ...
0
votes
3answers
129 views

Can a current source have a voltage across it?

I'm reviewing material from a lower div circuits class in preparation for the upper div class by redoing problems, and this is one of them. Does it make sense for the branch with the dependent ...
29
votes
9answers
2k views

Is current source also a voltage source?

I'm confused between current and voltage sources; I get the text book definition but I am not able to understand real world difference. To me both current and voltage sources seem as the same. I ...
0
votes
2answers
117 views

Why should the output impedance of a current source be much greater than the input impedance of the load?

For a voltage source (except RF circuits), the output impedance of the source signal being coupled must be much smaller than the input impedance of the load. This is first of all done to prevent ...
0
votes
2answers
81 views

What is the real every moment exact situation of an a.c source?

in advance of every discussion, i want to say thanks to this great scientific website that i'm recently getting to know it more and more and i'm really happy with. sometimes i get stuck with really ...
-2
votes
1answer
89 views

very basic basics [closed]

I just started studying but I've been having problems because my professor assumes that we know very basic things that we actually don't. So my questions are: What do I need exactly to have an ...
-1
votes
1answer
58 views

are op amps related to battery amper? [closed]

My question is simple. Can I use Lm324n while it has been directly connected to different types of batteries? For example series AA batteries Or Use 12V automobile car with 60 Ah.
-5
votes
2answers
147 views

How to increase microntroller pin Source and Sink Capacity

I'm working on a project but I've hit a block now. I need to drive a total of 169 LEDs using 26 pins at worst case all may be ON at once. I'm afraid that this may fry the MCU since 200mA is absolute ...
0
votes
1answer
45 views

calculate unknown source potential

In order to prepare for an exam in electro technics I have a specific task: I have the following measurements of an unknown circuit: \$(1)\quad U_{2(1)} = 4.28V \quad @ I_{(1)}=0.67A \$ \$(2)\quad ...
0
votes
1answer
215 views

Body Diode of a MOSFET

So for some MOSFETs, specially with Power MOSFETs, the body diode is a flyback diode that (as far as aI can tell) can be conveniently added to the MOSFET's bulk as there already PN junctions (correct ...
2
votes
4answers
216 views

Current source or current mirror?

I've been told that using current sources in simulation programs may produce "too optimistic" results compared to using current mirrors. Could someone please elaborate? I'm still a bit confused about ...
0
votes
2answers
81 views

What is the current source for in the Schmitt trigger?

What is the current source for in the schmitt trigger? I can't understand this. Can't see any resistor either.
0
votes
1answer
70 views

what would the drain voltage be if NMOS source voltage is not ground?

Hi I'm a beginner trying to learn CMOS cuicuit. Let's say we have two NMOS connected as shown. Given: A, B, C are connected to Vdd = 5V; VtM1 = 0.6V is the threshold voltage of M1; VtM2 = 0.5V is ...
-3
votes
2answers
175 views

6A Current Source [closed]

Hi I am designing a 6A current source. I know how to design a current source I am just looking for suggested materials that can handle the full 6A. The op amps and transistors that I have now are more ...
0
votes
4answers
445 views

how much energy is required to create a sound with constant frequency and amplitude?

Ok, this is a theoretical question, (Forgive my poor English, I am not a native speaker). Lets assume that I have a power-source with p unknown. this power-source provides energy to a speaker to ...
1
vote
1answer
26 views

Source Transformations resistor on bottom?

I know that source transformations work as shown in the top part of the attached image but what happens when the resistor is placed in a different location? Does this give the same result? If so, ...
2
votes
3answers
110 views

why isn't Norton transform applicable on ideal sources?

An ideal voltage source has no resistance in series to it, so the it's transform the current source must have zero resistance in parallel to it. This means that all the current passes through the ...
0
votes
1answer
114 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 sure ...
0
votes
1answer
423 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
125 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
124 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
1answer
688 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
3k 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
393 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
69 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
146 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 \$t>...
0
votes
1answer
41 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
325 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
3k 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 ...
4
votes
2answers
11k 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
209 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 = 6\Omega\$...
1
vote
2answers
393 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
207 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
114 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 I1=0....
0
votes
2answers
72 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
1k 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
438 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
454 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
2k 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 ...