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  1. B

    LED not working

    I do not find ebay dependable. Try to purchase from an official distributor.
  2. B

    Pocket stereo

    I used this once. It was like a DIY package. Needed some soldering. Here is also an MP3 player module with Simplified Output Speaker U-disk TF SD for Arduino. It supports the sampling rate (KHz): 8 / 11.025 / 12/16 / 22.05 / 24/32 / 44.1 / 48 2. 24-bit DAC output...
  3. B

    Problem with SIM6822

    The IPM may be damaged due to a sudden surge of current or voltage beyond its specifications.
  4. B

    Ultrasonic cleaner

    At first, make sure that the transducers are designed for operation at around 40kHz. Frequency mismatch may cause damage.
  5. B

    TESmart HDMI Matrix - blinking power

    Check if the power supply unit (PSU) is providing the correct voltage and is not faulty. Use your multimeter to measure the voltage output from the power supply to verify it matches the rated voltage of the matrix unit.
  6. B

    Issues with a VFD

    Inspect for any visible signs of damage on the VFD, such as burnt components or loose connections inside the unit.
  7. B

    Relay LED Optocoupler Circuit

    Disconnect the MCU and test the opto-coupler output behavior independently.
  8. B

    When the engine starts, sound will come from the mp3 card, and when the engine stops, sound will come from another mp3 card.

    You need an Arduino+Arduino music shield/module ( VS1053B)and necessary libraries to play audio files.
  9. B

    Sharp 173 Photointerrupter

    Have you used current limiting resistors according to the datasheet?
  10. B

    TESmart HDMI Matrix - blinking power

    I suggest you perform capacitor test, short circuit test etc.
  11. B

    SOP14 to DIL14

    You can use SOIC to DIP Adapters. These are commonly available and serve the purpose of converting a SOIC/SOP package to a DIP format.
  12. B

    Automatic electric bell using wifi

    You can use an AVR microcontroller plus An RTC like DS1307 or DS3231.
  13. B

    Ceiling fan

    Is there You may need to buy one like this. https://asiabright.en.made-in-china.com/product/nwuAfSToYmWd/China-RF-Ceiling-Fan-Remote-Control-CE-Certified-8-Hour-Timer-3-Speed.html
  14. B

    Ultrasonic Welder for thin LDPE? Or maker space that has an ultrasonic welder?

    Using a specialized heat sealing tool designed for plastics can provide a more consistent seal.
  15. B

    LED 1 input 2 output

    You can use a 555 timer-based circuit.
  16. B

    Looking for an old Motorola IC OpAmp SC9533P (7308)

    You can check the details for MC1741 and MC1458.
  17. B

    Need help stepping down voltage to LED strip

    When the AMS1117 module is connected directly to the battery, it continuously draws power, causing battery drain even when the LED is off. Placing it after the touch switch solves the power drain issue but interferes with the dimming function. The AMS1117 has a relatively high quiescent current...
  18. B

    Needed Assistance - EMI Issues with 16x2 LCD Display (Model BCB-1602-03C)

    Use a metal enclosure or a shielded box around the LCD and sensitive parts of the circuit. The shield should be properly grounded.
  19. B

    Power Management IC - Assembly issues

    Using a stencil to apply solder paste can significantly improve the consistency of the solder application, reducing the risk of shorts and cold joints.
  20. B

    Replace with what?

    What circuit is this?
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