1. L

    current flow question

    Hello, I'm a student and still don't get this. I've learnt that a current flow between 2 points of different electric potential, but I also read that the current only flows in a closed path. I guess the latter is for true only for steady currents, doesn't it? but in the case of AC, will the...
  2. johnyradio

    How to block low current?

    Is there a way to block current when the load is too low? Say we have a 60V source. If the load is pulling 4A. Current should flow. But if the load is pulling 0.01A, current should be blocked. When the load increases, then it should be unblocked. Does this question even make sense?
  3. A

    Which electrical signal is better for industry among the following? Why?

    Which electrical signal is better for industry among the following? Why? 1. 0 to 10 volts signal. 2. 0 to 20 milliamps signal. 3. 4 to 20 millimeters signal.
  4. M

    Load Testing a Cars Battery Using an Arduino to Monitor the Results

    I am working on a project that involves monitoring a cars battery. I can measure the voltage of it using a voltage sensor, a display and an arduino but that doesn't tell me much about the health of the battery. After researching, what seems to be the most popular way is putting a load onto the...
  5. rosssjamess

    Over current /short circuit protection for the battery bank

    I am using a 24V 100A additional vehicle alternator for charging my additional battery bank of 24V.I need an over current /short circuit protection for my battery bank. I am considering using a DC fuse between batteries and alternator. Can you please suggest me an effective brand and also rating...
  6. MrNams

    ESP32 to control 3 Phase Submersible Pump

    Hello All, I am working on IOT based Smart Irrigation project. In first phase I shall work on controlling water pump, right now my 7.5hp motor is controlled by "3 phase star delta starter". Could you please provide/point to web source for following queries? 1) Three phase motor don't have...
  7. iDux

    (Myth or something innovative?) Idea for inductors/electromagnets

    Hi, I wanted to share a little idea I had (which may have already been discussed), which would be: What if we take a pulsating DC current, modifying it into spiral loopies (Idk if this is possible), and applying this modified current to an Inductor, would that inductor´s efficiency be increased...
  8. Daniel28

    Emulate battery in charging state

    I am trying to build a circuit to emulate a lipo battery. Basically the circuit consists in a power supply to emulate the discharge behaviour and a variable load to eulate the charge behaviour. This is the circuit in a simplified way This basically generates 2 circuits...
  9. EUrbanAutoTech

    If V = I x R then does it still "make sense" to refer to a battery's voltage when not connected to anything? As in I = 0..?

    I'm an automotive mechanic that specializes in electrical/drivability diagnosis. I like helping other techs get a better grasp on this aspect of our trade. Now imagine I'm with another tech and I have a battery and a multimeter in front of me. I measure the battery's voltage and get 12V. Me...
  10. memedin

    I cannot control the transmitter with the XTR101 IC

    0-5 V to 4-20 mA linear conversion from voltage to current signal transmitter, this is the circuit I want to make. Materials used in the circuit: XTR101 BAT249 BD243 Level transmitter I am setting up the circuit, I get 5 V at the output without connecting the level transmitter. When I...
  11. MrsssSu

    Buffer AM signal (5W)

    Dear all, may I ask how to buffer an AM Signal so that it contains more power, maybe 5W for my Remote Control RC? I have buffered the AM signal using op-amp but the power output is just not enough. I have tried using this push-pull transistor pair, but the waveform seems to be unbuffered. I...
  12. K

    current from 5A to 200mA

    Hi can i ask you what is the easiest way to make from 5A 200mA in my power source? The only cruit I found is this but i dont even know how to count it.:( thx for your help
  13. S

    PAC1934 DC Power/Energy Monitor

    I want to read the voltage and current at the output of the line with the PAC1934 IC. It is stated that the breakdown limit is 40V, but when I give a voltage over 32V on this line, I cannot view it and there is an underlined phrase in the datasheet Page 3. What does it mean? How can I read a...
  14. MrsssSu

    Linear Frequency to Linear Voltage circuit

    Dear all, the circuit above is quoted from here, and I wish to try to produce similar graph in LT Spice but I am unsure of it. The LT Spice schematic is correct since I tested it with specific 10V input AC, and it produces linear voltage on its output. However, I want to do an AC sweep on this...
  15. MrsssSu

    Reduce Frequency of Waveform

    Dear all, may I ask if there is a circuit that produces the following input and output which basically reduces its frequency by 2 times which also basically stretch out the input waveform to produce the following output? Thank you for reading :)
  16. effectivedragon

    Question regarding water resistance changing with voltage

    Hi, recently I have been trying to find out regarding resistance of water at high voltages. I may seem oddly obsessed with this but it is forming a big part of a science project I am doing revolving around electrical safety with water and wet things, using detailed resistance values to back...
  17. MrsssSu

    How to freeze CD 4017 (Rain Led Chip)

    Dear all, I have successfully simulated a continuous led array that light up consecutively one after another using LT Spice and have even built one on breadboard and it works well. Well, my question is how would you freeze the led and how do we activate the clock inhibit on both the chips? Like...
  18. MrsssSu

    Amplify High frequency microvolts sine wave

    Dear all, I simulated a radio-receiver circuit, where I have actually build a part of the circuit which helps to amplify a sine 550kHz frequency of microvolts (antenna voltage) into several volts, however, I do not see any amplification on the output as highlighted above where I attached a...
  19. MrsssSu

    How to buffer AM signal?

    Dear all, I have actually built an AM circuit in real life to combine high frequency carrier sine wave (200kHz) and signal wave of triangle wave at (3kHz), and the output is on my oscillioscope which I am happy about. However, when I try to resonant the wave on my oscillioscope using LC tank...
  20. MrsssSu

    TL072 LT Spice Model

    Dear all, can anyone share TL072 op-amp LT Spice Model with me (probably better if placed in zip file ) ? I am trying to simulate a TL072 to produce 1MegaHertz sine wave :) Thank you for your help :)
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