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  1. Today
  2. yuehuazz

    Vibration Sensor Selection

    I hope I can help you, there are sensors of great quality.
  3. Yesterday
  4. peter g

    advanced l/c meter

    yes, the meter worked fine. I have built many esr meters, both analog and digital.
  5. audioguru

    Phone components

    There are a few completely different types of phones and you do not say which one. Landline phone, wireless phone and cell phone. Take one apart and look inside then count the components. Why???
  6. Last week
  7. Vlad Krasavtsev

    Phone components

    Are many components required for a phone?
  8. admin

    advanced l/c meter

    Hi Peter and welcome to the community. Could you share your thoughts building this LC meter and if everything worked right from the beginning.
  9. peter g

    heathkit IT-11 capacitor checker

    hello forum members, I have the above cap checker that's having a problem. i'am trying to set the leakage currents for the three different type capacitors. the Electrolytic position can be set to 2ma. the min electrolytic and non-electro, needs to be set to 15ua and 2ua respectively. the eye tube will not close in any position of the adj pots. I changed the two main electrolytics and the 6BN8 tube to no avail. need help please.
  10. I want to be a power electronics engineer, but I am anxious that I don't have the minimum skills in order to become one. From past posts about power electronics, I know that skills in analog ic design and VHDL or Verilog are needed. I wanted to know what other skills are necessary to become a power electronics engineer? My background: I have a BS in electrical engineering (power and energy systems concentration) and am a first year masters student. I have taken at least one course in power electronics, microelectronics, and control systems. I have yet to take an analog ic course, and I dropped a digital ic course after two months as I didn't enjoy working with W/L ratios or physical layouts. My programming skills are limited. I learned C and Python, but I haven't used it outside the class. I am comfortable with MATLAB.
  11. Earlier
  12. I think membrane switch... Membrane switches are the modern version of mechanical types and are meant to deliver exceptional performance when put inside dominant devices. These are just short switches that are widely employed in many electronic appliances today. These switches are now highly preferred over the traditional ones as they come with customizable options. They are incorporated with print copper or silver because of the main circuit layer. They can be non-tactile or may have a tactile response which then makes the device fast and minimizes its operation time. They also provide the very best level of responsibility, execution, and integration, which are required today as we need precise switches to run advanced and sensitive electronic switches.
  13. How stable are the temperature readings?
  14. hesamavr

    proteus 8

    What do you want to do with the Proteus 8? circuit simulation or PCB design?
  15. hesamavr

    Did I design this right?

    Hi, I don't work with the KiCad, so I checked the images. Try to use a solid polygon for a ground plan instead of routing ground tracks for all components. This is the first tip before anything else
  16. Recently I found a very interesting website which I decided to share here. it holds the library information (I think around 15,206,168 so far) of many electronic components (schematic symbol, footprint, 3D, datasheet). even if the component does not exist in the database, it can be designed online quickly, or it could be ordered to be designed for free! At least from today, I will not waste my time to design footprints and/or schematic symbols. I can remember my mistakes in the footprint design or PINs order and frustrations afterward https://componentsearchengine.com
  17. zeeshanarain

    Vibration Sensor Selection

    I have a vibration screener for powder almost 40kg batch / 20 mints and i am looking for a sensors to fix on it to sense Vibration Can anyone suggest any good quality of Sensor ? Thanks in Advance https://bloomenterprises.co/product-category/motor-drives/
  18. zeeshanarain

    ARDUINO UNO DC JACK POWERING LIMITATIONS

    Yes you can use it, i dont think there is any specific current limitation feel free to use it will burn your Arduino uno ;-) Thanks https://bloomenterprises.co/product-category/motor-drives/ Further you can have a look on the attachment. Motor drives.txt
  19. Algot

    0-30 Vdc Stabilized Power Supply

    I discovered ... The problem has nothing to do with the power supply. I was using a voltmeter based on the ICL 7107 to make the measurements, and when I put another meter I did not find any variation in the output voltages. The readings of my small home-mounted voltmeter go up only when the source has loads on the output, otherwise these metaphysical follies do not happen. When using a common multimeter with a scale of 6,000 counts I did not find any variation in the different loads and voltages that I put in the output of the power supply. Even so, I switched TIP31 to BD139. I am just a hobbyist in electronics and here in Brazil people like me can not afford professional or sophisticated equipment to study and experiment, we need to build our bench equipment by dismantling old appliances and taking advantage of the pieces taken from these scraps. That's why all the information about this project is very important to people like me. Thanks again for the help and information.
  20. A friend of mine has a table saw that has a NEMA L6-20 plug, and he's attempting to make an adapter so that he can plug it in to the NEMA 10-30 outlet that his dryer is connected to. He's purchased an L6-20 locking connector, a 3-prong plug that fits a 10-30 outlet, and 15 feet of bundled wire that includes red, black, green, and white wires. While trying to wire both the connector and the plug together, we ran into a problem, because the 10-30 plug requires black and white wires (no red or green), and the L6-20 connector requires black, green, and white wires (no red). Speed Test Scrabble Word Finder Solitaire We started googling solutions, but have not found the proper solution. My instinct tells me that we haven't found a solution because the types of plugs/wires are not meant to work together, and could potentially be dangerous if we tried to make them work. I'm hoping someone on reddit might have the answer to our questions. So, first of all: Is this a safe wiring solution? If yes, how do we connect the wires between the L6-20 connector and the 10-30 plug? If no, what would be a better solution so that my friend can plug in his table saw to an outlet safely and properly. Thanks in advance!
  21. audioguru

    automatic Solar Lamp

    If the battery is good then it should power the circuit for a few hours when it is fully charged.
  22. redwire

    0-30 Vdc Stabilized Power Supply

    I'm planning to build (another) power supply with Q1 to see if it clamps down the output to prevent spikes when the power is shut down. I plan on using 7.5K and 240 ohm divider. With power on, the base of the transistor will be -0.03V. When the negative rail collapses, the base of Q1 will be 1.23V with approx. 5.1mA. Now I just need to pick out a good transistor for Q1.
  23. audioguru

    0-30 Vdc Stabilized Power Supply

    When the negative supply collapses to 0V when the positive supply is still 37.8V then the current in both resistors in series is 37.8V/(12k + 160 ohms)= 3.1mA. If the base is +0.65V then the current in the 160 ohms needs to be 0.65V/160 ohms= 4.1mA so the 160 ohms resistor value and the negative supply voltage are too low. I removed Q1 and somebody else later added it back in wrongly.
  24. damien.douchi

    automatic Solar Lamp

    I read the datasheets and I don't see why they wouldn't work together, but i'm no expert. the mosfet is a SSM3J352F,LF , the opAmp is LMV321LICT , I got them both from digikey. They are super small and were tricky to weld, I can't exclude that I fried them when I welded. I did 3 lamps and they all show the same behavior, and I think it's unlikely that they are all fried, specially as they work when the battery is charged. should I put a resistor to the opAmp VCC pin? i'm afraid it will decrease even more the voltage... concerning the driver it is a 3W LED driver from aliexpress : https://fr.aliexpress.com/item/3W-LED-driver-16MM-DC3-7V-1-Mode-LED-Flashlight-Driver-for-CREE-XRE-Q5-XPE/32627605064.html?spm=a2g0s.9042311.0.0.654f6c37kYHKsp does anybody have another idea for this circuit? something energy efficient to get the battery last the longest possible. Thank you very much for your help
  25. redwire

    0-30 Vdc Stabilized Power Supply

    I have a question about the sizing of the resistor divider for Q1 on the revised schematic. Currently it is listed as 12K and 160 Ohms. When the negative rail (-1.3V) is operating, the base voltage on Q1 will be approx. -0.7V assuming a Vdc of 39.6 on the top rail. When the power is shutting off and the negative rail collapses and goes to 0V, the transistor base will be 0.5 volts. The minimum on voltage for typical transistor( 2n2222) is 0.6V. Q1 will not have the minimum voltage to switch. Using a 12K resistor the current may not saturate the transistor to operate like a switch. The original design utilized a 5.1 zener for the negative rail with (10K and 1.5K) divider on Q1 resulted in a operating voltage on the base of the transistor of -0.01 V, but when the negative rail collapsed it resulted in 5.1V on the base of Q1. Do I have an error in my math?
  26. audioguru

    automatic Solar Lamp

    The battery is powering the opamp and LED when the solar panel is dark. You did not say a part number for the opamp, Mosfet or driver so we do not know if they will work from only 3.2V to 4.2V. The 3W LED might use a current of 3W/4.2V= 0.7A and maybe your opamp is actually an audio power amp that has a high current. Then the battery is drained in a few hours. You learn by reading the datasheets and selecting parts that work together, not by having errors and more errors.
  27. Hello Masters, I have made this design gathered from google. The intention is to achieve a delay about 5 minutes only then activates the flipflop with relay. The problem is I can't get the 4-5 minutes delay by adjusting the variable. Is there a solution? and maybe a refine to this circuit? Please see attached file.
  28. Hello. I would like to make a garden solar lamp that automatically turn on when the sun goes down. I tryed first with a transistor s9013 npn (seen on youtube), but it restricted the current, i suspect because of the internal resistance of the transistor. I decided to try the use of an Op amp as comparator, with a low internal resistance P channel Mosfet. I don't have much experience with these components, and the best way of learning is trying right? So see below my circuit. My problem is that it seem to work fine when the battery is full but the solar charging doesn't seem to be very efficient (the charge light does turn ON) and the battery looses it's charge fast, leading to a weired blinking LED. would anyone see a problem with my circuit explaining that? thank you very much for your help Best Damien
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