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Questions tagged [electronic-load]

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0
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3answers
78 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 ...
0
votes
1answer
49 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 ...
0
votes
0answers
30 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
votes
0answers
54 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
votes
0answers
48 views

This is a basic question but I'm confused please help [duplicate]

I need to power my circuit. I have a power supply of 12v 8.5 amp my circuit needs 12v 1 amp. What do I need to do?
0
votes
1answer
63 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 ...
-2
votes
1answer
124 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
votes
1answer
106 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 ...
0
votes
2answers
104 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
votes
1answer
56 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
votes
1answer
339 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
votes
6answers
147 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.
0
votes
4answers
422 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
votes
4answers
77 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
vote
2answers
659 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
votes
1answer
113 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
votes
1answer
184 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
69 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
324 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
vote
2answers
469 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
votes
1answer
91 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
votes
1answer
311 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
votes
1answer
95 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
votes
5answers
245 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
170 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.
0
votes
2answers
690 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
votes
5answers
670 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
351 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
votes
2answers
223 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
votes
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
vote
1answer
206 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
votes
2answers
151 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
vote
0answers
67 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 ...
-1
votes
2answers
117 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
votes
1answer
421 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 ...
1
vote
0answers
110 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 ...
2
votes
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 ...
0
votes
2answers
719 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
votes
1answer
6k 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
votes
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
votes
2answers
26k 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
votes
2answers
851 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 ...
6
votes
2answers
6k 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 ...
7
votes
6answers
75k 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 ...
3
votes
5answers
3k views

Variable resistor that can handle hundreds of watts?

We have some big resistor test loads, like 8 Ω 250 W loads for simulating speakers: Are there also big variable load resistors for testing power supplies? What are they called? If not, what do ...
5
votes
1answer
742 views

setting up an electronic load

I have an electronic load that I want to use to help me with some ATX switch mode power supply repairs. The instructions that came with the load were rather sparse and I haven't found much for my ...