Questions tagged [electronic-load]

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27 views

DC Electronic Load in Constant Impedance Mode

I have an Electronic Load module that allows the UUT to be loaded in either Constant Current (CC), Constant Voltage (CV), Constant Power (CP), Constant Resistance (CR) or Constant Impedance (CZ) mode. ...
2
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0answers
71 views

TLE2141 op-amp alternative (in DC load circuit)

I recently found a schematic for a DIY electronic load, which I think is based on Dave Jones's EEVBlog old DC load design (attaching the source link: Dynamic DC Power Load (updated), but I am ...
5
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2answers
152 views

Is it possible to use a Mosfet in switching mode as an electronic load?

I'm trying to use a mosfet as an electronic load to measure the IV curve of a solar cell, but if I use it in linear region it dissipates too much power. I was thinking that I could use it in switching ...
2
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3answers
187 views

Electronic load, Problem turning MOSFET on

I am trying to make an adjustable dummy load to test a 12V supply, I’m having trouble with the op-amp feedback circuit. Attached is a simplified schematic. I have tried lots of things and stripped it ...
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2answers
98 views

In building an electronic load with a mosfet and op amp. It adds some benefit to use a mosfet driver IC?

I´m building an electronic load following this schematic. My op-amp is an LM358 or LM324. My mosfet can be an IRFZ44N, and STW45NM50 or a IRFP460. Those are the parts that are in my bin. My ...
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0answers
183 views

Electronic load for negative voltage PSU

I am making a MOSFET based electronic load to test my PSU rails. Below is a simplified version of my circuit with V2 as the PSU that is being tested. I want to be able to test negative voltage rails ...
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3answers
114 views

Can someone explain this constant current load circuit?

I'm currently a rising junior in EE and I was just wondering if anyone could help explain this circuit for me. The purpose for this is because I need to learn how to build a discharger (constant ...
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1answer
76 views

Impedance load matching

So I've done this so far, and know one of the components is a 50ohm resistor. However I dont know where to go from here. How do i decide if its an inductor or a capacitor? This is a past paper exam ...
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0answers
31 views

Using variable resistor to nullify Cap Bank Droop

In a high power application I am charging a cap bank to 800V and letting it discharge into a load of about 2 ohms for 2 seconds. To avoid droop I could overcharge the capacitors and use a buck ...
0
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0answers
153 views

Buck Converter Load Regulation

I have attached a schematic of a buck converter circuit I have designed. It's designed using a LMR16030 IC. Input voltage: 12-14V Output voltage: 5V Switching frequency: 1MHz Output Current: 2A I'...
0
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1answer
71 views

Looking for design advice for custom electronic lock

I'm building a door lock that will be controlled by a Raspberry Pi Zero W. Here's a link to the lock I'm using: Electronic Cabinet Lock With Status Reporting (MA1208S-T) From what I understand, this ...
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1answer
132 views

why in case of dc neither of terminal is at zero potential? [closed]

why in case of dc neither of terminal is at zero potentialpotential while in case of ac ground is at zero potential ,let us consider negative terminal of the dc is at zero potential then why we use ...
0
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1answer
107 views

High temperature of components to joining & soldering

Please help me to know the best components for the process of welding an electronic circuit to operate it in a very high temperature environment up to more than 600 degrees Celsius? Note: I do not ...
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2answers
121 views

How can I sacrifice a bit of DC Voltage to transform it to DC current?

I made a project with using voltage doubler(which has input of 12V) which output is 43V(I expected 24V) but current is low when connecting the 150 ohm resistor,its about 150mA,but I dont need so much ...
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1answer
61 views

electronic devices impedance and drawing current

I have a questions that kind of bugging me for a while. So in electronic devices, it has capacitors, inductors, resistors, transistors and etc. All of these together is the load of the device, which ...
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1answer
474 views

varistor curve and voltage meaning

Could I get an explanation for these datasheet definitions for a varistor? 1) Max. applied voltage. 2) Min varistor peak volts. 3) Max varistor peak volts. 4) The clamping voltage is known to be ...
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6answers
170 views

Type of resistors [closed]

What is the difference between 220 ohm resistor-1/4 Watt and 1/2 Watt? Which is suitable to be connected to a LED of FV 1.8V and current 15mA ? Supply voltage is 5V.
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4answers
555 views

Electronic load MOSFET drain to source current suddenly increases

My questions: Why would the drain to source current of MOSFETS suddenly increases. What can be done to resolve it? I am aware that there is supposed to be an increase in current as soon as the gate ...
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4answers
81 views

Non-mechanical load suggestions for a 12VDC / 6A PSU?

I need to provide a load for the 12VDC/6A power supply. I used a small motor before, but something less mechanical (more reliable) like a light or (anything that's not mechanical) would be ideal.
1
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2answers
911 views

Ripple when switching on MOSFETs with PWM

I'm currnetly trying to construct an electronic load for testing purposes and experimentation. This is my schematic: R2 are 7 X 4.7 Ω , 150 W each, resistors in parallel to cope with power up to 1kW ...
0
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1answer
149 views

How to minimize high dV/dt device wich is connected to analog electronic load

I designed an Ac electronic load and tried to connect it to a switch mode half bridge (for testing purposes)as can be seen in the figure. Since the switch mode half bridge has high dv/dt output ...
0
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1answer
250 views

Reverse polarity protecion on an electronic load

I want to add reverse polarity protection on my electronic load which will be capable of sinking 20A and with a max. voltage of 50V (max. power is limited to 250W). Because I want to go with low input ...
0
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1answer
75 views

What will happen if you apply a AC Signal to a Programmable DC load(63600)?

DC load consists of mosfet or many in parallel, for dc loads it arranges in series/parallel combinations to reach specifications of load. I have a doubt on it if AC load is applied,will it withstand ...
3
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1answer
383 views

Zener problem in motion detection circuit

I am studying a sample motion detection circuit which uses a D203S PIR sensor and a BISS0001 motion detector IC. After sensing motion, BISS0001 gives output which switches SCR and SCR switches TRIAC. ...
1
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2answers
521 views

Switching of a variable resistive load

I'm trying to design a purely resistive load that is digitally controlled. The idea is of an array of resistors that are driven with power MOSFET's. I want to feed a current pattern into the ...
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1answer
97 views

5V to the discharge pin, threshold pin and trigger pin

What happens if I give 5V to the discharge pin, threshold pin and trigger pin of 555 without giving power at pin 8 and grounding at pin 1?
2
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1answer
396 views

Class B power amplifier using only Nch FETs

I'm building a combined linear regulator/electronic load. When the output is lower than the supply Q3 acts as a linear regulator and when the load tries to pump power back the other way, Q6 acts like ...
0
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1answer
118 views

Advice on making a heating coil

I want to heat a pipe to 150 deg C. Pipe size aprox 0.5m long, diameter of 0.1m My plan is to find a 240v to 24v adapter, connect this to some coiled nichrome wire (probably 24g) with a resistance of ...
0
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5answers
275 views

What circuit I need to lower 20MHz 3.3-0V square wave to 0.01-0V square wave for very low load driving? [closed]

My FPGA board outputs the 3.3-0V square wave at 20MHz. I need to convert it to 0.01-0V square wave to drive the very low load (0.1 Ohm). What kind of circuit I need and Is there anything I need to be ...
3
votes
1answer
181 views

What's the purpose of the resistor in a 3A load box

There is a resistor R5 in the 3A load box below. It seems it add some positive feedback to Q1, but I'm not sure. What's the exact reason to add it? The circuit comes from here.
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2answers
769 views

What is the general operating principle of an AC Electronic Load?

I'm working my way through electromagnetics and in particular power (line) transformers at the moment. I'd like to be able to run tests of various kinds at different AC loads and possibly at different ...
0
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5answers
847 views

Is it possible to boost current into a load without boosting voltage also?

If a device "D" requires X watts power, and I have a power source Y that is less than the nominal voltage recommended by the device "D", can I obtain the same performance for the device by somehow ...
1
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1answer
379 views

how to design a differential op-amp for sensing a ac current?

I tried to design a simple electronic load, but I would like to amplify the the voltage across the sensing resistor with gain of 20. Then I can apply a sine wave reference to have a current between 0-...
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2answers
251 views

Why doesn't my cascode circuit work?

first, i started building a simple circuit in the lab just with one Mosfet and now it is working. then i tried to improve it and add another mosfet as cascode topology.as can be seen in the figure. ...
0
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1answer
33 views

project RT level using register [closed]

to every one. excuse my poor english. may someone help me resolve this problem. What does RT level means? A,B,C,D,W,X,Y and Z are register of n bit. project the RT level of this function just using on ...
1
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1answer
232 views

Some problems with my dump load controller

The requirement is an automatic dump load controller; for balancing lead acid or lifo batteries. While the input voltage is above 1.75V the circuit should dump 10A into the load continuously. ...
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2answers
160 views

why smartphones don't cause noise on the around speakers

Before the smartphones (or maybe before the some new tech) when a cell phone rings, the speakers around it made noises. Hovewer, nowadays they do not. Why? What changed?
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0answers
72 views

Digital to analoge voltage regulator

I am a complete beginner on electronics. I am trying to make device to control the voltage output according to a digital input. So basically what I need to make is to continuously increase the ...
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2answers
119 views

Electrical measurements of Chicago substation from where can I get it? [closed]

I am doing a project on electrical load prediction using machine learning. Machine learning involves creating models based on past data. For creating these models where can I get data regarding ...
0
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1answer
451 views

Active load using MOSFET

Good evening! I want to create an active load system where I can vary the PWM signal from the microcontroller to the control input of the MOSFET which is attached to a fixed resistive load. I want ...
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0answers
116 views

Driving, feeding and similar terms in electronics

My technical background isn't very strong, and I often hear about one circuit "driving" another, or "feeding" it. Although, intuitively, I believe I understand the concept, I am not sure I would be ...
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2answers
2k views

Will a large capacitor damage a circuit

I have 32 servos running from a 7.5V battery rated at 2500mAh and I'm sure that it has enough power to handle the servos, but it doesn't look like it can handle all of the servos pushing at once. I ...
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2answers
726 views

Is it wise to use an Arduino to power a crystal oscillator?

I'm building a small VGM audio player. I currently have a SN76489 (here) that is clocked from a 3.579 crystal oscillator. When ...
3
votes
3answers
2k views

ATX Computer PSU: OK to connect loads between positive rails, e.g. +12v to +5v

I have looked, but haven't find an answer. Are ATX computer PSUs capable of having a load connected between their positive rails, so that for example, current would flow from a 12v rail to a 5v rail? ...
2
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1answer
7k views

High-side MOSFET drive in current-limited power supply

As preamble, this is the typical schematic for an opamp constant-current load used for testing power supplies and what not. (Sorry for the terrible circuitlab MOSFET symbol; that's an N-enhancement ...
2
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2answers
1k views

Designing parallel RLC band-stop filter in series with load from f0, gain, Q parameters

I've been trying to design a band-stop filter for my headphones to cut back on excessive highs and to provide a more flat frequency response. With a software EQ and lots of tries, I managed to arrive ...
0
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2answers
27k views

how to use CT to measure current [duplicate]

I have purchased CT but don't know what his terminals means and how to identify primary and secondary coils terminals. I am software engineer but currently learning pic controller. as for I have read ...
5
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2answers
905 views

Electronic test load design

I'm considering designing/building a fairly basic electronic load (constant current, but possibly also constant power and resistance). However, after drawing up a few ideas for the basic operation, I ...
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2answers
7k views

Beginner information related to constant current dummy loads

I am beginning an electronics design project to build a constant current load to drive testings for batteries, bench power supplies etc. I have been hard trying to locate some black-on-white ...
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6answers
78k views

What is the exact meaning of Load?

I am just starting off with hobby electronics and can't get hold of the concept of Load. Do electrical appliances also "Draw" current. An air conditioner upon start dims the light. My point is that if ...