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  1. Martaine2005

    Need help in reverse engineering this power failure alarm circuit

    I think you’ll be alone with this request. Surely you can make a BOM yourself as it’s all in front of you!. Apart from a few resistors, we can’t even see the markings of the ICs. Q1 and U4 especially. What’s the need for reverse engineering this apparently simple circuit?. Use a torch to shine...
  2. Martaine2005

    JBL Bar 2.1 Mk2 making screeching sound when audio is played.

    Yes, change the caps. But get them from a reputable supplier. Cheap deals on eBay or similar, you never know what you’ll get.
  3. Martaine2005

    JBL Bar 2.1 Mk2 making screeching sound when audio is played.

    As suggested above, filtering appears to be the main reason. You really need to check the ESR of those capacitors before you go down a rabbit hole. As also mentioned, the fact that the audio/noise increases with volume, suggests that the audio IC’s, preamp and amp are working.
  4. Martaine2005

    Sony DAV-TZ130 Home Theatre System

    Hi, have you ruled out the USB device?
  5. Martaine2005

    Hi. I have a parkside PLG 20 C3 charger that has completely stopped working.

    Did you read the whole thread?
  6. Martaine2005

    DIY? 8MP Video Balun for custom PCBs?

    Yes, which is why I said to try the company.
  7. Martaine2005

    DIY? 8MP Video Balun for custom PCBs?

    Try this company https://www.lundahltransformers.com/wp-content/uploads/datasheets/1575.pdf
  8. Martaine2005

    JBL onbeat xtreme only works when warm.

    Or read post #4
  9. Martaine2005

    Unknown pcb switch

    Yes, a difficult switch to find. Even AI picture lookup couldn’t identify it. Are there any Automec/CNC type forums that may be able to help?. I think you have three possible options. 1. Fit a momentary switch under the original casing?. Keeps it looking original. 2. Look to buy a broken...
  10. Martaine2005

    Unknown pcb switch

    Is it latching? Non latching? Illuminated? What’s it from? Give us some clues in order to help you.
  11. Martaine2005

    Hi. I have a parkside PLG 20 C3 charger that has completely stopped working.

    Start by checking the fuse in the plug. Then you’ll have to open the unit to check the continuity of the cable. While the unit is open (unplugged) check for a fuse on the PCB. Take photos and upload them here.
  12. Martaine2005

    tiny 12v fan for my miniature models to exhaust humidifier vapor/misthi

    Ok, try mounting the fan lower and put some kind of conduit or tube attached to it and attached to the roof too. You need to stop the smoke recirculating like a convector heater. Think about how a kitchen extractor fan works.
  13. Martaine2005

    tiny 12v fan for my miniature models to exhaust humidifier vapor/misthi

    Chimneys can be quite complicated. In real life, they are not straight up. They are designed to draw upwards and out. We use ‘smoke sticks’ to test for a draw. Perhaps your model chimney doesn’t draw and is recirculating inside. As an experiment, I would try a push pull affect. A fan (slow)...
  14. Martaine2005

    tiny 12v fan for my miniature models to exhaust humidifier vapor/misthi

    A normal AC to DC adaptor with an actual transformer inside will get warm and is completely normal. However, if it’s running at 85-100% of its output specifications, you will need an adapter with higher current output. Add all the items current requirements together for a total
  15. Martaine2005

    tiny 12v fan for my miniature models to exhaust humidifier vapor/misthi

    Forget that! I think you need a much lower RPM. Perhaps 200-500 RPM. A motor with a gearbox would be ideal.
  16. Martaine2005

    tiny 12v fan for my miniature models to exhaust humidifier vapor/misthi

    Perhaps it’s spinning too fast. Slow it down with a lower voltage source. See if that works.
  17. Martaine2005

    tiny 12v fan for my miniature models to exhaust humidifier vapor/misthi

    Have you wired the fan correctly? It may be pulling air rather than pushing?
  18. Martaine2005

    My geared stepper motor is getting noisier after prolonged use. How should I maintain it?

    Hi Frank, Has the motor got a bolt on gearbox or gears in the can?. What lubricant did you use and where? Are the gears nylon or metal?
  19. Martaine2005

    New to Arduino & ESP32

    Welcome aboard @Nexus04 I’m not sure if you are aware, but there are a plethora of code for pretty much anything on the Arduino site and GitHub. If you’re a good programmer, you can simply alter some parameters to make the code do exactly what you want rather than starting from scratch.
  20. Martaine2005

    Dheeraj Sudan and Meenu Hinduja-How can I design a stable power supply for my circuit?

    Choose the appropriate filter and decoupling capacitors for your design. Filter caps for minimal ripple and decoupling caps as close as possible to the IC legs. Leave plenty of headroom to avoid thermal issues and a heat sink if applicable. As mentioned above, show us your design.
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