Questions tagged [electronic-load]

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5answers
99 views

What is the difference between high-Z (high impedance ) and open circuit?

I cannot understand exactly difference between them. I am not sure about this topic. I think high-Z means "temporarily open circuit." Can you explain the difference to me?
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1answer
78 views

Need guidance for building a electronic load using BJTs

I've been studying DC electronic loads and almost all of them used mosfet as main transistor, while researching I find out that mosfets that are designed to work in their linear region are expensive ...
1
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2answers
88 views

Constant resistance mode in electronic load

I have this DC electronic load. I am setting this electronic load to a constant resistance mode option - say 100 ohms - and turning the output ON. When I measure the resistance across the electronic ...
0
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1answer
36 views

Problems enabling remote voltage-sense Rigol load DL3021 via SCPI

I am automating some tests with Rigol hardware. There is only one bottleneck in the SCPI implementation that I can't figure out: How to enable the remote voltage-sense terminals on the Rigol DP3021 ...
1
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1answer
29 views

Confusion on Voltage levels in Digital Waveforms

My question is why Io is in different direction when Vo=H and Vo=L respectively? I really can not understand the underlying mechanism!
0
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1answer
26 views

Using Inductor and Electronic Load Instead of a Permanent Magnet Synchronous Motor (PMSM)

I would like to test whether my power board can handle to currents required to drive a 1.5 kW motor. My issue is that the motor testbench is still not here and I have to test it now. I do not have ...
0
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2answers
145 views

How to use SCPI over RS232 with a Rigol Programmable load?

I have a Rigol DL3021 programmable load. I'd like to control it as part of an automated test setup, over SCPI from a Linux box. Their programming manual assumes you're on a Windows machine and wants ...
3
votes
1answer
61 views

Battery/Charger Not Reaching Float with Load Attached

I'm trying to add a backup/UPS to a system I have outside with the following battery charger - https://www.meanwell.com/Upload/PDF/ENC-180/ENC-180-SPEC.PDF . The DIP switches are set for AGM mode. My ...
2
votes
2answers
143 views

Chrome plating current control

I am an electronics hobbyist and this is my first attempt at an analog circuit of this type. Mostly I stick to arduino and LED stuff or just wiring up kits, etc. This is my first attempt at designing ...
1
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2answers
105 views

MOSFET gets hot in an Op-amp MOSFET-based constant current load build

I've made this schematic following the circuit steps in this site: and after running the output with just 0.1-1A (which works ok according the input setting and current reading seems correct) but the ...
1
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1answer
99 views

Cartridge loading in Rodec phono stage

I saw a very strange design of phono stage in Rodec MX180 consoles. 3 generations of those mixers (mk1, mk2 and mk3) have this phono preamp on board! They have an input filter with 1nF cap then 220 ...
-2
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1answer
218 views

How to reduce dc 5 volt to below 1.5v by add extra load [duplicate]

I have an USB charger with 5V DC output. I want to use this charger to power a 1.2V DC motor. I think about adding an extra load, like a DC bulb, to this circuit, maybe it could reduce the voltage ...
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0answers
66 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
162 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
votes
2answers
173 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
votes
3answers
490 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
193 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 ...
1
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0answers
332 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 ...
0
votes
3answers
158 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
82 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
266 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'm ...
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1answer
75 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
146 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
140 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 ...
0
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1answer
66 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 ...
0
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1answer
573 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 ...
-2
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6answers
185 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
684 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 ...
0
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4answers
82 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
1k 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
153 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
300 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
votes
1answer
83 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
votes
1answer
450 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
554 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 ...
0
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1answer
99 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
440 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
126 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
296 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
187 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
843 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
951 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
vote
1answer
402 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-...
0
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2answers
295 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
245 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. ...
4
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2answers
172 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?
1
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0answers
74 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 ...