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  1. Martaine2005

    Pioneer LX-424 - Need Help

    Not long, but don’t have power on!. Move the switch vigorously, spray in a little more, repeat. Then power on and test it.
  2. Martaine2005

    Pioneer LX-424 - Need Help

    Clean the switch with a contact/switch cleaner. Spray it in the switch and rigorously move the switch. Perhaps perform this twice.
  3. Martaine2005

    power

    That’s simple then. Design the PCB for the higher voltage and current, assuming the higher voltage carries more current (if not design for max current), and don’t connect the batteries. Tell them it’s wrong!.
  4. Martaine2005

    power

    As @Harald Kapp mentioned earlier, a switching supply may work as they are ^90% more efficient than a linear regulator. But the main problem still arises, paralleling different voltages. It’s not impossible, it’s plainly wrong. Edit: plus, no load information. Perhaps they want you to tell them...
  5. Martaine2005

    power

    I’m sure you’re not telling us everything. They should know not to parallel different voltages. Also, you applied for a job as a PCB designer without knowing this as well. I suppose as long as you’re not charging these batteries, you could add a buck converter to the highest voltage and limit it...
  6. Martaine2005

    power

    I don’t get it. Paralleled cells of different voltages is a no go. Well, of course you can but not advised. Can you add circuitry to each battery before they are connected in parallel?
  7. Martaine2005

    power

    Right! Maybe that should be your answer.
  8. Martaine2005

    power

    They have to be balanced. Without a diode, the weaker cells will cause the Good cells to deplete quicker and generate heat. I still don’t understand what you’re trying to achieve.
  9. Martaine2005

    power

    You can use a buck/boost converter and adjust it to your desired voltage or use a voltage regulator.
  10. Martaine2005

    power

    #1 you shouldn’t parallel batteries with unequal voltages. #2 batteries don’t give constant voltage, the voltage will change as the battery depletes. What do you want to do?
  11. Martaine2005

    Arduino & DFPlayer mini noise.

    That’s great to know too. Thanks @Delta Prime
  12. Martaine2005

    Arduino & DFPlayer mini noise.

    I’m completely new to Arduino and coding. The device I’m copying is a random thunder and lightning unit for a friend’s Halloween party. The code was also copied and works great. I have other questions about adding to the unit, like mosfets or relays trigger at the same time as the lightning...
  13. Martaine2005

    Arduino & DFPlayer mini noise.

    Great, thank you. I’ve never used such large capacitors on the output before. Never needed to. I’ll put a diode in now before I test it again.
  14. Martaine2005

    Arduino & DFPlayer mini noise.

    They are there. In fact, I went overboard!. But I may have sorted it now. I put a 1000uF on the 7805 output and the noise almost disappeared. I followed up with a 470uF and it’s almost perfect. I had decoupling everywhere. I systematically removed one by one and listened to the difference. No...
  15. Martaine2005

    Arduino & DFPlayer mini noise.

    This is the breadboard layout exactly how I copied it. One minor difference is that I put the 7805 on the bottom power strip with the output going to the top power strip. The black wire connecting top and bottom negative/GND together is quite bad as an antenna. Touching it sounds like running...
  16. Martaine2005

    Arduino & DFPlayer mini noise.

    Thanks @danadak , I knew those questions would be asked:) and I should have been better prepared. I’ll sort the schematic and pictures as soon as I can. After work tonight, I’m going to solder it all to perf board first to eliminate my breadboard and jumper wires.
  17. Martaine2005

    Arduino & DFPlayer mini noise.

    Hello forum, As the title suggests, I’m having issues with noise. One wire in particular on the breadboard which connects both sides Negatives together acts as an antenna. The other noise issues are (I believe) low frequency oscillations from the DFPlayer while playing. The Arduino has a higher...
  18. Martaine2005

    Cordovox piano G keys dead

    You could start by replacing all those electrolytics. But pull a couple around the G circuit and test them.
  19. Martaine2005

    PFC: How does it work

    The purpose is to make the device more efficient. Google is your friend for an in depth explanation.
  20. Martaine2005

    What are the 3 wires of a computer fan hooked to?

    Red is 12V+, black is GND/neg- and yellow is the signal wire. Be sure that yours is 12V as some are 5V.
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