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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

current

  1. A

    Detecting AC VOLTAGE [INPUT (0-200) up to 1000 V AC] [OUTPUT: Any low DC is ok]

    Hello! I need to build a circuit with a DC output that is ON whenever the AC input is active (a.i. voltage is present at the input) ideally from as low as possible but it could be as high as 200, 250 VAC and still be acceptable but needs to survive up to 1000VAC spike and some 600VAC constant...
  2. M

    Square wave using LM319 Comparator.

    Hi People, I am using an LM 319 High Speed Comparator to produce high frequency square wave as shown. However, from the first diagram, I assembled the connections based on second diagram, it does not work. The V+ and V- that is negative rail and positive rail I used is +9 and -9 V from 2...
  3. G

    L200 Linear PSU with adjustable output Voltage and Current

    Hi to all. A few days ago, I started thinking to build on my own, a linear power supply able to output 30V 10 A. I chose to use the L200 IC, because I've got some of them and I want to use some components recovered from old boards. I started making the schematic following the application note...
  4. S

    my "precision" current measurement project design review/ check

    hello! I was wondering if anyone could take a look at my circuit for my second version of my "precision" current sensor, specifically the analog section. (TL/DR Last Paragraph). my first version, discussed , was a overall failure, although I did learn quite Abit from that so it wasn't a total...
  5. R

    H bridge l298n in Parallel Burning Out After Some Time

    Hi Guys, I have a college project where I need to controll a motor (27V / 3 A), I used a H Bridge l298n in parallel to support the current, It worked for while and then stop but I don't know what was wrong. Does any body know anthing that could help me? The motor is a Maxon 118752 precision...
  6. C

    Dependent Current Source

    Hi guys, I'm in an introductory EE class and I was wondering, if the dependent variable of a dependent current source is zero, does the dependent current source become a short circuit or open circuit? Thanks for the help.
  7. C

    Voltage Division Question

    Hi guys, I am a total noob and just learned voltage division. I was given this circuit and was wondering why it is appropriate to apply voltage division across the 60 and 20 ohm resistors. I know they are in series which is the basis for voltage division, however the 45 ohm resistor on the...
  8. C

    What frequency value to use to find the correct time constant for a 22kΩ resistor?

    Hey guys, I have just been introduced to time constants and I'm having some trouble with this question. What frequency value do you plan to use to obtain the correct time constant for a 22 kΩ resistor? (Hint: It takes five time constants for a capacitor to go through the full charging...
  9. A

    Powering ESP Controller from dry contact connection

    Hi all. So firstly I'm a complete noob when it comes to electronics so please excuse my shortcomings here. My challenge. I have a dry contact connection that is outputting 12v. Ibwant to use this to power an ESP module (WemosD1). The challenge I have I assume is the current. When I connect...
    • AMS7
    • Thread
    • amperage arduino current dry contact esp
    • Replies: 20
    • Forum: Arduino
  10. S

    Bipolar transistor

    Hello everyone, I have a little issue here. I know it's not really hard but it has been a moment since I've worked with circuits like this and transistors, so I can't figure out this circuit... The question is: In DC analysis, calculate the bipolar transistor's voltages Vb, Ve, Vc. Deduce the...
    • sabcam
    • Thread
    • bias point bipolar transitor cmos current dc analysis electrical circuit homework pmos transistor voltage
    • Replies: 4
    • Forum: Homework Help
  11. J

    Can a 5A Switched Supply Peak at Much Higher Currents?

    Are switched mosfet boosts, like this 5A device, designed to handle brief load peaks which are many times higher than it's rated 5A? http://www.xlsemi.com/datasheet/XL6019%20datasheet-English.pdf thx
  12. A

    Question About Current Draw From Peltier Element

    I have a TEC1 - 12706. Specifications detail Imax at 6 amps. I would like to run five of these elements in parallel but my bench top supply can't supply the current needed ( I'd like about 5 amps each). I do however have a 600W power supply unit designed for PCs. The PSU has a single 12V rail...
  13. E

    Help on finding Thevenin Resistance and Current across resistor for RL Circuit?

    Hello! Good evening to you all! I'm currently brushing up on RC & RL circuits in preparation for an upcoming exam, and I found this circuit to be rather complex in its design. I've had a limited understanding of natural and step responses for RC & RL circuits, and this circuit certainly hits it...
  14. electrolives

    LTSpice Current vs Voltage Graph

    How can i get current across voltage graph on LTSpice?
  15. mading2018

    Output current from MOSFETS (bridge) before trafo?

    I having a concern about the what kind of current that I have after the MOSFETs (in the transistor bridge) before transformer. Before the MOSFETS I have a DC current from an AC/DC converter stage. So I am a bit confused if the current before the transformer is average, peak-to-peak or RMS...
  16. mading2018

    Change the current from a voltage source?

    So what I understand so far, if I want to have 16 A out from a voltage source (230 V RMS) which is 325.269 V in amplitude (peak), can I simply add an resistor in parallel to achieve that? R = 325.269 V / 16 A = 20.329 ohm Do you think guys if I am on the right track? So if I am want simply to...
  17. Z

    Kirchoff's Law for 3 loop circuit with multiple voltage supplies

    Hi, I am working on the below circuit to find; the power dissipated by RL (8Ω resistor), voltage drop across RL and current supplied by the 10 volt battery (V1). So far I have used Kirchoff's law to the best of my ability to get 3 loop equations but 4 unknowns, I am thrown off by the variable...
  18. Clarkdale44

    Inrush current limiter... How to do it?

    Hello... I have an DC to AC inverter, which is capable of outputting 600 Watts at margin. I have a few inductive loads that causes the inverter to overload and restart (after restart the load works fine). Although it only takes 1 second approx but still it's annoying... My inverter can run all...
  19. Gabriel Sá Pinto

    Measuring LCL and OVP thresholds in LTSPICE

    Hi there! I've been given a group of circuit schematics for testing and I must measure the current and voltage thresholds on a Latching Current Limiter and Overhead voltage Protector respectively. I know how to simulate and measure currents and voltages in LTSPICE but something about the...
  20. A

    Sourcing surface mount high current connector

    Hi All I'm having a dilemna at the moment, I have designned a battery balancing circuit and need connector for this that are rated at 10A max per contact perivously I used a SAMTEC IPBT connector which met my requirement the only problem was the height with the connector and the mating half had...
  21. A

    Current Sensor threshold and monitoring

    Hi all I am using the following current sensor: https://uk.farnell.com/lem/hais-400-...meResp=All&searchView=table&iscrfnonsku=false Datasheet: https://www.farnell.com/datasheets/51649.pdf?_ga=1.141388658.194281532.1473847905 I will be measuring currents in the range of 500A to -500A, and I...
  22. ElectronsFlow

    Constant current circuit for buck converter

    Hi and thanks for viewing! In the past I've used a few buck converters off ebay. So far they've done me well, but I'd prefer to have the ability to build my own. That way I'm in control of the quality of components used. I was planning on using the LM2678T-AJT as the heart of my buck converter...
  23. ElectronsFlow

    Anyone have a schematic for a Constant Current DC load tester?

    Hi everyone, I've been surfing the web trying to find a schematic for a constant current DC load tester for use with a battery bank (48VDC) Ideally something that can handle 50amps or more would be fantastic! So far I've only found either low current or useless schematics online with nothing...
  24. Clarkdale44

    Solar charge controller ?

    Hello I have got one last confusion about charge controllers doesn't matter whether it is pwm or mppt. Thing is i have seen many CC with variety of output amps on 12v and 24v with different manufacturers... But they are all different.. Which number in a charge controller defines that how many...
  25. Clarkdale44

    Cheap AC clamp meter reading DC current?

    Hello As the title states, my ac only cheap clamp meter is reading dc currents when i am charging battery bank through an inverter... My inverter is rated to charge 12v 150Ah battery at 16 amps and during charging when i put the clamp meter on the red battery charging cable, the meter shows...

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