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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.

voltage

  1. Athosworld

    AC Motor Series Capacitor

    Why does adding a capacitor in series to an AC motor increase its speed? The capacitor does boost the voltage somehow because the input voltage is 132v (mexican mains) and coming out from the capacitor are 230v. This has to do with the inductance because it wont work without the motor. I made...
  2. 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...
  3. 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...
  4. A

    What can of relay or system do I need to use for 7000V rat trap?

    Please forgive if some information or diagrams are missing, I will provide any information you consider necessary if you ask for it in the thread. As you might soon discover I have no background/knowledge in electrical engineering. I will start working on a project to build an electric rat...
  5. J

    Please help: TP4056 charging module output voltage

    Recently got one of those, and I was wondering what the output voltage was. I know the input is 5V, but the very-much-standart Li-ion 18650 battery I use is 3.7V I'm planning to connect a Digispark ATTINY85 board to the output, which requires also 5V. Will the ATTINY85 work properly? I heard...
  6. C

    tesla coil help , please!

    Hello I have been trying to build a tesla coil for awhile now. I cannot get a bulb to light up . I have gotton some crazy voltage readings tho. It only a 9 volt coil and this my first big project . getting really frustrated , just need a little help. Please anybody
  7. RachelAnne2020

    TPS54116QRTWTQ1 Design| VTT_DIMM and VTERTF Voltage Problem

    Hi, guys, I'm new here. Recently I made a design of TPS54116QRTWTQ1 based on the datasheet. According to my design parameters, the actual voltage CPUVCC15 is 1.5V, VTT_DIMM is 0.46V and VTTERF is 0.86V. But the voltages of VTT_DIMM and VTERTF are not correct. When I remove the load behind...
  8. D

    Missing datasheet from the new motordriver JYQD_7V.3E3 24V

    Has someone the new datasheet from the JYQD_7V.3E3 motordriver 24V (that one with the hall sensor pads on the side)? I can't find the new version or this one where the hall sensor pads aren't aligned...
  9. HappyDoggy

    I am a newcomer to the name conversion industry.

    Hello everyone, I resigned a few months ago and transfer the industry. I have already learned the basics of circuit, 8051 microcontroller, I contact proteus a few days ago, and now I am using it to make PCB. I am currently blocked on the schematic. I want DIY a learning board, it will include...
  10. J

    Protection circuit ULN2803

    Hello Everyone In this post I want to ask if you know of any circuit that can protect the integrated ULN2803, because when I make the connection to a stepper motor it overheats and stops working correctly, or I advise to use another reference to control the motor Step by Step? ULN2803 I am...
  11. 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.
  12. C

    Voltage Division Question

    Hi guys, I'm working on a problem here where I believe one of the steps uses voltage division to find the voltage across the 10ohm resistor. However, that's not how the solution found the voltage across the 10ohm resistor. I was trying to find the voltage across the 40ohm resistor first and...
  13. A

    3 phase 3 wire measurement

    Dear all, I am trying to build 3 phase voltmeter that could measure L-L and L-N voltage during 3 phase 3 wire and 3 phase 4 wire connection. 3 phase 3 wire and 3 phase 4 wire connection are external connection. as we know in 3 phase 4 wire we will get neutral reference so we can get...
  14. 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...
  15. 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...
  16. electrolives

    LTSpice Current vs Voltage Graph

    How can i get current across voltage graph on LTSpice?
  17. electrolives

    LTSpice AC Signal 30sin(2pi50t)

    How can i put the Vi's values on LTSpice? 30sin(2pi50t)
  18. J

    SMD Electrolytic Capacitor: Decoding Capacitance & Voltage Rating

    I have an old accelerator board used in the PDS slot of an Apple Macintosh SE/30. The board was manufactured around 1994. I want to replace the electrolytic capacitors but I'm not sure how to decode the numbers printed on the caps. Here's a photo: As you can see the numbers are: 22 6 A...
  19. mading2018

    Half-bridge DC/DC converter

    I am trying to simulate a half-bridge DC/DC converter, and I would like to increase the output voltage to at least 320 V. Do you have some suggestion on how to do that?
  20. A

    what's the working principle of this inverter circuit

    https://imgur.com/a/yCI0j I found this inverter circuit online I can't read it , can you explain it to me thanks
  21. 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...
  22. N

    Breath Controller with 3.5mm Jack to make 0 - 5 V Variable voltage (Control Voltage) on 6.5mm Jack

    I am a beginner and wish to tackle this project... I have an old Yamaha breath controller device that has a 3.5mm Jack and requires -9v on the tip (the sleeve is positive). It draws a current of approx 7mA to 20mA depending on how hard you blow it (from what I have managed to research but may...
  23. ala khemiri

    can anyone good on mikroc can help me?

    have a a Project that measures the voltage from a 3-phase lines and Display it on LCD using PIC16F877A. I wrote the code in the mikroc language; the problem is that the LCD shows a lot of wrong characters. this are the Project code `sbit LCD_RS at RB4_bit; sbit LCD_EN at RB5_bit; sbit LCD_D4...
  24. 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...
  25. D

    Governor for homemade generator

    Hello, I'm new to this forum so I would like to say Hy to all. I builded homemade electric generator. It's 2kw generator from Briggs&Stratton lawn mower engine (four stroke with carburator and centrifugal governor) and 1phase inductive industrial motor. I managed to get motor to generate...

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