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0
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1answer
45 views

Effect on loading a DC motor - load torque

Can someone please give a (detailed) explanation (perhaps with formula's) of how the load (torque) affects the armature current of a DC motor (seperately excited or shunt or series) ? As the load ...
0
votes
1answer
40 views

Power management at thermal power station

I have weird question, but I hope somebody can give at least hint what should I read to understand the concept. Imagine situation: There is thermal power station and a city that takes power from ...
2
votes
1answer
67 views

Determine the maximum load of a power supply

I am trying to upcycle an old bit of tech I had lying about. The main part I am looking to recycle is the power supply however I do not have specs of the power supply itself. I have measured an output ...
1
vote
0answers
28 views

Cycling peak load trips genset

I have an application where a cycling peak load from a 40hp motor is regularly tripping a 65Kw genset. Here are the details of the configuration: 65Kw Genset powered by a natural gas engine 40hp ...
2
votes
2answers
53 views

why does the parallel resistors with voltage source can be ignored as well as resistors in series with current source in term of equivalent circuit?

I have a problem dealing with equivalent circuit. I don't know why when the resistors that is parallel with the voltage source can be ignore as well as one in series with current source. Of course the ...
1
vote
1answer
88 views

Where does the current in a Dickson Charge Pump come from? Does the oscillator/PWM pin of a microcontroller also source current?

Well, I am making a small circuit which looks like this: When simulated, the load current gets up to about 200-280 mA no problem, so I want to implement this circuit in real life. My only problem ...
1
vote
2answers
122 views

Output voltage of unity-gain buffer varying with current?

I'm working on a VLC+IR transmitter that runs from batteries. I decided to use an LM317 so that the discharging battery wouldn't really affect the current through the LEDs. (Disclaimer: I've never ...
2
votes
2answers
238 views

What determines a load's current requirements?

Apologies if this question has been asked before. I'm sure it has but hard to find as wording of question may not bring up the duplicate question. Let us say we have a 10 ohm resistor as a load. ...
1
vote
4answers
290 views

Give a RL load, how do you calculate whether if it is capacitive or inductive?

This is a topic which has always confused me. For example, if the impedance at the load has the form of \$Z = R + jX\$, \$R\$, \$X\$ positive real numbers, then then network is called inductive. If ...
0
votes
1answer
90 views

Load sharing using asynchronous motors

I am involved in the design of a system composed of: multiple asynchronous motors, each equipped with separate drive, all acting in parallel on a load, via a common rack and pinion transmission. ...
1
vote
1answer
102 views

RF load (terminator) at the end of RF attenuator

Do I need to install RF terminator at the end of RF attenuator? Let's say that max power output for RM port is 50W and I'm using 100W 50dB attenuator. What if I was using 50W 40dB attenuator? Is there ...
0
votes
2answers
73 views

Do batteries have a delay when adjusting to a new load?

So I am creating a battery voltage measure, and it takes a reading both when the battery is in open circuit, and when it is loaded with a 100mA constant current. I have set it up and the reading is ...
0
votes
2answers
61 views

Comparator Output Swing Measurement

i wan't to measure the maximum and minimum output swing of a Comparator. I'm using the circuit which you can find attached. However, since the Output of the Comparator (TI LM2903) is open drain, I ...
1
vote
1answer
116 views

ADC Reading is much lower than expected

I am using a EFM32GG990 microprocessor and I am trying to get it to read a voltage using it's on-board ADC. I have made a circuit that I wish it to measure, both the loaded and open circuit voltage ...
0
votes
2answers
144 views

How to hook up a load cell to an Instrumentation amplifier correctly

I am trying to get load cells connected to an instrumentation amplifier. The load-cells I have are extremely similar to the ones here https://www.sparkfun.com/products/10245. They have 3 wires coming ...
3
votes
1answer
128 views

how to select capacitor for a crystal oscillator

Here is a 32 MHz crystal from one of TI's reference design The BOM list defines the crystal as ...
0
votes
0answers
47 views

Solar charger under rapidly varying conditions/impendance

My solar equipment consists of: Solar panel capable of: 20V Peak / 3.6A Peak Li-Ion Battery pack: 8.7V, 9Ah, (2S3P setup) My solar charger setup consists of: 5A DC-DC BUCK converter (XL4015) ...
2
votes
1answer
70 views

Differential amplifier with active load Sedra Smith

I'm studing differential amplifiers on Sedra Smith book, and I have come across the following circuit. My question is: how can NMOS transistor \$Q_2\$ have a current \$g_{m2}\cdot v_{id}/2\$ if the ...
0
votes
0answers
48 views

How do I determine what size generator I need?

What are the number of factors and considerations to be taken into account before sizing a prime rated generator? I am having a situation where I would be having 3 motors of 10 kW each and all these ...
0
votes
1answer
54 views

Capacitive load at the output for analysis of CMOS cells

This question is very rudimentary one. Please point me to the link if this question has been already asked. In general, when working with simulations and and analyzing the standard cells designed ...
1
vote
1answer
105 views

Level Shifting & Amplification

I am trying to design a crane load (Weight) measuring unit using motor current measurement technique. For some reasons we can't use load cells here. Part of schematic I have drawn here An air core ...
3
votes
3answers
340 views

Is a protection diode needed for a resistive load?

In some applications a flyback diode is added parallel to the load. Is that because the switching causes reverse voltage for inductive loads? What if we have a resistive load instead? Do we still need ...
0
votes
1answer
62 views

Transformer size?

How can I set the size of a transformer for a cooling fan project? The load is 100A, the power supply is 125A, we will take input from 230Ac 60Hz. Incoming two phases and outgoing also two phases but ...
11
votes
1answer
408 views

Capacitor exploded - why?

Recently I had an explosion on my desk. A 220uF 25V electrolytic capacitor just blown up shortly after attaching a load. The high-level connection was: Phocos CA08 (solar charger controller) -> ...
-1
votes
1answer
127 views

Motor Control For Overload

I am using PIC 18F45K80 for four phase dc motor control operation. The maximum load current is 30 Amps. If it exceeds 30 Amps, I have to call stop_motor() function in my coding in order to switch off ...
0
votes
0answers
58 views

Battery-load query

Imagine the following circuit. The load consumption varies during the time (during a minute it has 3 different current consumption). When the DC source generates power, where does this power go? (to ...
1
vote
1answer
86 views

Maximum load current that is still indistinguishable from battery self-discharge

I am designing an electronic device that will be powered by a battery, and I am trying to keep my device's current draw in standby to a minimum. Specifically, I would like to keep the current just low ...
0
votes
1answer
173 views

How to correctly edit a system to increase per-unit voltage of a bus [PowerWorld Simulator]

I have created and simulated the following energy system using PowerWorld Simulator 17 (please download the picture if it's not clear). Now, I was given the requirement that every bus should have ...
4
votes
2answers
113 views

Why use asymmetrical capacitor values for crystal?

Are there any circumstances where you would want asymetrical load capacitors on a crystal? I came across this schematic in the documentation for an NXP UART. It looks just wrong to me. Can anyone tell ...
3
votes
1answer
270 views

Load cell, help

I am using load cell, from here. Load cell specification are mentioned on the site. 5 wire coming out, its a 4 wire core shielded load cell. What screwing thing i am facing is: Getting same voltage ...
0
votes
3answers
196 views

How to calculate power supply for 100x loads @ 3V 700mA

I'm currently designing a setup using 100x loads that requires a 3V 700mA supply ea. The loads are connected in parallel with the main power supply. I'm a bit doubting about my power supply dimension ...
0
votes
1answer
152 views

Instrumentation amplifier for load cells

In the most part of tutorials I see they use INA125 as the instrumentation amplifier for load cells. Is it ok to use another cheaper amplifier as the AD8237? Or is there a specification or ...
1
vote
1answer
122 views

Does this loadcell's creep mean that I can not let a constant load on the loadcell?

I want to build a connected scale that I can set coffee powder (for example) on it and check over the internet how much of coffee I still have without going to see it. Usually all loadcells have a ...
1
vote
3answers
348 views

Load Resistor across Crystal

What is the purpose of using a 1M Ohm resistor across crystal pins? Please refer to the image for clarity. The crystal serves as the clock source for an USB Hub device(LAN9512). There is nothing ...
0
votes
1answer
99 views

Power opamp 'floating' output

So I had to design an amplifier with a 'floating' output. (I don't know if floating is the right word, it's the direct translation from dutch.) See the picture below ( I drew it whilst sitting in the ...
1
vote
1answer
94 views

How will I know the Power Efficiency of a load?

I have a thevenin circuit with a source load. How will I get the Pin and Pout?
0
votes
0answers
125 views

Parasitic inductance causing large current spike

I'm studying the performance of electrodes in methanol fed with a pulsed DC power supply. By this I mean the power supply is being turned on and off in a controllable frequency and duty cycle. If I ...
1
vote
3answers
294 views

Input Protection for an Electronic Load

I'm currently working on a dummy load designed for testing small power supplies less than about 10V. I'd like to provide reverse input protection to prevent the op-amps from being damaged. Because the ...
1
vote
2answers
134 views

Isn't there a Voltage drop across a resistor?

I've been reading this Wikipedia - Electrical Load topic and there is a section which is confusing me... So what you do is go to the "A more technical approach" section in this topic and then read the ...
2
votes
3answers
284 views

How do you drive a high current load from a moderate current source?

If I have a power supply that can supply 5A @ 12V and I need to be able to supply an inductive load with 20+A @ 12V, how would I go about this? I need a burst of current for about 2-5 seconds. Will ...
1
vote
1answer
64 views

Replace Current controlled Voltage Source Converter with Rectifier Diodes in ELC?

In this paper an Electronic Load Controller (ELC) for two (2) parallel generators is designed. I wish to omit the second generator and hope for simplification. Now two questions arose: (while I ...
1
vote
1answer
69 views

How can one calculate Load Regulation for a temperature sensor?

I am wondering how to calculate the Load Regulation of a temperature sensor. For example ADI's TMP37? I know how to calculate % Load Regulation from Wiki, but not sure how to get to the mC/uA units? ...
2
votes
2answers
447 views

Load-line analysis derivation

I'm trying to get a better handle on the derivation where load-line analysis comes from. This is because I have a system that essentially has two different loads operating on a single diode and I'd ...
4
votes
1answer
1k views

Arduino Boost Converter. Connecting load makes converter non functional

I am trying to build a DC-DC Buck-Boost Converter using this basic schematic and an Arduino with the analogWrite() function as my PWM generator. I only want to step up 2.4-3V to ~5V. If it's just the ...
3
votes
3answers
6k views

How can I calculate the inductance of the primary of a transformer given a specific load on the secondary?

Inductance in the primary of a transformer decreases as the load on the secondary increases. How can I calculate the inductance of the primary coil? What if it was step up or one to one ratio?
3
votes
5answers
265 views

BJT input connected to another BJT's output and loading effects

Sedra & Smith Microelectronics, example 6.10, page 390. They ask us to analyze a BJT circuit. Here it is: simulate this circuit – Schematic created using CircuitLab In the next ...
0
votes
0answers
58 views

Protect power supply from mechanical switching of load

I'm powering a resistive load from a laptop PSU. The circuit will be closed and opened using a mechanical switch. I am worried that the switching will damage the PSU due to inductances in the PSU. ...
3
votes
2answers
955 views

General 3 Phase Motor Inductance Question

I know that motors are inductive loads. Does the inductance of a 3 phase motor depend on the load on the motor?
3
votes
1answer
532 views

Complex Dummy Speaker Load Impedance

I would like to create a dummy load for this so-called "Deacy Amp": This is a low power germanium transistor / transformer driven push-pull amplifier for driving a small 4 ohm or 3.2 ohm speaker. ...
0
votes
2answers
429 views

ADC Value from load cell to MSP430 not correct

I have a 1000lb load cell (LC302 from omega) being fed through an INA125 OPAMP then to the ADC10 of a MSP430G2553 with 2.5V as reference. 2.5V is coming out of the OPAMP that's being fed into the ...