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Questions tagged [source]

Voltage and Frequency are typical absolute sources or references to drive other circuits. You have voltage references and frequency references. Current is defined by placing a known stable voltage across a known stable resistor. Frequency and Time measurements are often driven by a master oscillator ...

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55 views

what does a current source and resistor make in a series circuit? [closed]

There are rc circuits and rlc circuits. What kind of circuit does a current source and resistor make, and what is its function?
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0answers
23 views

Difference between UPS output power source modes [closed]

We are currently monitoring a Delta GES803HP3312035 UPS with SNMP, but we don't know what do the output power source modes we are getting mean. The specific MIB OID is dupsOutputSource (1.3.6.1.4.1....
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0answers
21 views

Power source select with push buttons

For my project I have 2 power sources and 2 push buttons. What I try to achieve is if I push on button #1, power source 1 connects to the circuit. If I push on button #1 again OR on button #2, power ...
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0answers
20 views

Positive current source into negative supply

I am trying to use an LM334 as a constant current source on a power supply output. Because I want to have true zero output, and the LM334 operates at Vmin of ~1V, I want to put a TC7660 charge pump ...
0
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1answer
68 views

Source Transformation

Ok, I have modified my question again about the same circuit seen below: I have to simplify the circuit using source transformation and then find the current ix. I have attached my attempted ...
1
vote
2answers
79 views

Combining two ideal voltage sources with an impedance between them

Solving a problem, I came across the following source transformation:        My question is: I know that I can do the following:       &...
0
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1answer
71 views

Can a Dependent source be dependent on itself?

I am looking for the Thevenin Resistance here. However, I have no clue what to do with \$i_b\$ and the source dependent on it. This is the entire circuit. \$i_b\$ is the current through the 5\$k\...
0
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1answer
52 views

Single tone signal generation at microwave frequency with best phase noise and spurious performance

What is the best way to generate a single tone signal with best phase noise and spurious performance? Is frequency multiplication the best way? single stage multiplication or multi stage ...
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1answer
44 views

Confusion with signal/source being low or high impedance [closed]

Regarding the following excerpt: High impedance source gives you more volts and less current Low impedance source gives you lower voltage but more current What ...
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3answers
160 views

Why does current have to return to its source in a circuit?

As far as I know there should be a current when a high potential point is connected to a low potential point, but apparently that is not true. I understand that a circuit must be closed in order for ...
2
votes
2answers
124 views

Opamp current source stable in simulation but unstable on prototype

I've tried to build this opamp/mosfet current source, and been struggling to make it stable. When simulating the open-loop gain in PSpice. I've set it up like this, which should give Vout = -AB at the ...
2
votes
1answer
176 views

op amp current source oscillating

I know this topic has been discussed a lot, but there seems to be varying opinions about the solutions.. The problem is we are trying to make a current source with an op-amp driving a FET as the load....
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0answers
202 views

Design a Voltage controlled current source

I have to create a current source (cs) capable of delivering up to 1.5 amps in order to calibrate a IC. The cs must be adjustable through a signal generator. I thought I could use an op-amp and I ...
0
votes
3answers
84 views

Implementing a constant current source circut that can be switched off by a voltage signal

Does anyone know how to implement a constant current source circuit that is able to output 10mA constantly, ideally the load of the circuit would be a 100uF capacitor in series with 100 Ohms. Is ...
0
votes
1answer
51 views

Based on what should i choose an amplifier to implement a Howland current pump with?

I selected some amplifiers based on their input and output voltage since the howlands Gain is Vin/R also on how much current the amplifier can supply. i selected ones that are 100mA and up, what other ...
0
votes
0answers
32 views

resistor at external clock source line [duplicate]

im reading a arm based mcu board schematic and there is 100R resistor (R30) at external 25MHz oscillator source. What is the main reason of using serial resistor at clock line ?
0
votes
2answers
46 views

What would be the best way to power 10 AAA powered torches with mains power (240v)

We manufacture small AAA powered RGB torches. To test them I'd like to power up 10 at a time with crocodile clips. Ideally, the power source would be a mains powered supply. Would wiring off a multi-...
0
votes
2answers
61 views

Researching chips and sourcing components [closed]

How do you research and select a chip for a given task? Are there some formalised and centralised databases I should be using? This would go equally for pre-assembled modules. Following on, where ...
1
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2answers
55 views

Interactions between Ideal Voltage and Current Sources

Last week I asked a question involving a linear network involving ideal current and voltage sources. You guys gave me some great advice as to how to approach those types of problems. However, this ...
0
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2answers
61 views

Ideal Voltage/Current Source Circuit Analysis

I am trying to understand what it going on in this circuit diagram and how to go about solving this problem. I am told to find Vx given that the current in the central wire is zero. Does this mean ...
0
votes
2answers
261 views

How to make a symmetrical DC power source?

I have been tasked with creating a logic probe that reads High/Low/High Impedance, but what works in simulations, isn't working in practice. This was my idea: I made a symmetrical power source using ...
0
votes
4answers
851 views

Thevenin equivalent, of circuit with one voltage and one current source

I am a Computer Engineering Student, and we have a lesson called Electric Circuits. I am trying to understand Thevenin's Theorem, but there is a circuit that confused me. simulate this circuit –...
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2answers
83 views

Why do some electric circuts need 2 or more voltage sources [closed]

Why would we put 2 voltage sources(bateries) into an electric circut ? What are some real world examples where they are needed ?
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1answer
185 views

Voltage source and its load resistance matching

i have implemented DAC controlled DC voltage source. I'm having trouble understanding physical reasons for voltage error due to load resistance change. My circuit desing was taken from DAC ...
0
votes
1answer
62 views

How is this source actually connected in the circuit?

I have seen this way of connecting the source in a couple of books now but I still am not sure if I am getting it right. This is how I am interpreting it, I have a feeling I'm very much wrong. The ...
8
votes
5answers
2k views

*Very* high precision, *very* stable current source

My background: experimental physics. Not an electrical engineer, but I have some experience putting together basic electronic circuits for physics experiments. So please be kind and explain as if I'm ...
0
votes
1answer
142 views

Can I use a power supply as a constant current source?(+general understating problems)

I beg you pardon if the question sounds trivial. I have a Power Supply that can provide a outer voltage between 0 and 32 V , and an outer current between 0 and 10 A. I would like to connect a ...
0
votes
1answer
677 views

How can a grounded gate MOSFET conduct current?

I am trying to get into understanding of current mirrors, amplifiers and other basic electronic blocks, and I have come across this a lot, but I couldn't find an explanation how that works anywhere (...
0
votes
1answer
129 views

Thevenin and Norton Equivalents

I was trying to solve a simple electronics Thevenin/Norton equivalent problem, and I understand the concept as I solved many others correctly. However, I seem not to understand how this one can be ...
0
votes
4answers
877 views

Designing 0- 300 mA current source with 12v Voltage supply (load = constant 40ohm)

I'm trying to design a 0 to 300 mA controlled current source, the problem is that the supply voltage is a normal adapter with a 12v output. I'v already tried several op-Amp based circuits but the ...
0
votes
1answer
136 views

Hamlin Reed Relays for Audio: Sink or Source?

I'm building a small stripboard audio switchbox using some hamlin 5v reed relays (HE3621A0550, mouser link here). A small SPST momentary switch activates the relay. Wondering if the best practice is ...
0
votes
0answers
53 views

Will two equivalent circuits always have the same current through/power dissipated in their elements?

I was asked to solve for the current through the 8-ohm resistor twice, once using superposition, and once using source transforms. For the source transformation I changed the 45-V source to a 15-A ...
0
votes
2answers
114 views

Why this source transformation leads to different result?

I've been stuck for this source transformation, it seems quite simple, but I just can't tell why the results are different. As pictures below, I transformed (-3mA par 5Kohm) to (-15V series 5Kohm), ...
0
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0answers
73 views

Variable Current source using P-CH MOSFET

I design current source to 0-8A for 3ohm load 24V supply. The circuit has two working mode: 1. Switching between two currents: 0A and 8A. (digital control input) 2. Variable current source 0A to 8A (...
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vote
4answers
1k views

Can't understand concept 'stiff source'

What does it mean in itself and in context?. Bolded phrase in section 10.5.2 IEEE Std 519. Methods for compensating for existing or potential flicker are much the same as those used to compensate ...
0
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3answers
578 views

Transient analysis with current source

Given Find: “v” and “i” for t>0 I found init conditions: i(0-)=i(0+)=0A v(0-)=v(0+)=0V i(infinite)=3A v(infinite)=4*3A = 12V To obtain transient response we need remove Current Source with ...
1
vote
1answer
72 views

Quick question about ground

So in the A.C distribution network the return conductor which is connected back to the source of the voltage is connected to ground as the theoretical potential of ground is zero the neutral is then ...
0
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2answers
153 views

Circuit with adjustable source and a diode

I'm struggling a bit with diode circuits. simulate this circuit – Schematic created using CircuitLab The source is adjustable. Which value the source has to be to the Diode start conducting? ...
3
votes
2answers
596 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
2k 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
1answer
819 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
51 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 the ...
3
votes
4answers
195 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 ...
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votes
2answers
269 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
660 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
185 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 a 5.1 ...
1
vote
1answer
260 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
81 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
4k 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
247 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 ...