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  1. Martaine2005

    Need to replace belt on Masterwork 340 8 Track player

    I can't be sure. Somebody who used to service these will hopefully come along. In the mean time, can you post more pictures of the insides as models were revised. Martin
  2. Martaine2005

    Need to replace belt on Masterwork 340 8 Track player

    It may be a lot cheaper to cross reference the belt. Try this website. Also, measure the belt and thickness. It may be easier and cheaper to find by size. Possibly some other components could do with replacing too. Check the electrolytic capacitors. Martin
  3. Martaine2005

    Velleman 12 key common output confusion

    That would suggest the button is de-pressed, possibly faulty or sticky. Your schematic has all switches in parallel which would achieve nothing. One on or all on will give the same reading. Both of your meter probes are connected to the negative terminal. Finally, connecting switches as you...
  4. Martaine2005

    Akura Retro Phono n BT Player AITVS550 BTRB

    The unit with no power at all, I'd be inclined to check the diodes near the power and battery connectors first. Martin
  5. Martaine2005

    12 Battery charger transformer issue/identification

    What components are under the heatsink after the X2 capacitor? Have you checked the fuse again to see if a short has caused it to fail again? Martin
  6. Martaine2005

    Akura Retro Phono n BT Player AITVS550 BTRB

    I think @VenomBallistics was referring to the IC's on the board. Look up the datasheets and they will give you the pin configurations (if they are visible). Some manufacturers grind identifying numbers off. Can you be more specific about Are there any signs of life? LED on? Click when switched...
  7. Martaine2005

    Now the Fun Begins

    Very nice. I might use this in the future and claim the credit :cool: Martin
  8. Martaine2005

    Induction wall socket/outlet to replace BS1362 standard ?

    AND I doubt any 'normal' person would be able to release the 'receiver' if neodymium. Check out a youtuber called EEVblog. He has debunked the wireless charging systems with great accuracy by crunching numbers. Perhaps the future will see this in every home. Just not yet. Martin
  9. Martaine2005

    Can BC548 be replaced by 2N3906 and 2N3904?

    That's simple enough to put them in backwards. Then it's correct. Martin
  10. Martaine2005

    King Kong massage chair

    Apparently, the owners manual is here but requires registration. It came from this site that says it is a safe site. But it seems if you come out of the site, you are left with a download link. So perhaps no registration needed? Martin
  11. Martaine2005

    Can BC548 be replaced by 2N3906 and 2N3904?

    I think that BC came before AD :p
  12. Martaine2005

    Can BC548 be replaced by 2N3906 and 2N3904?

    Yes, that is correct. Martin
  13. Martaine2005

    12v DC to 24v 50Hz AC square-wave 500mA: transformer & transistor?

    I think you need to go back to the drawing board. What current does your solar panel supply? Or what solar setup have you got?. What was the output current on the supplied AC adapter? (not input). Specs from the label. What are the specs of the DC to DC converter you tried? Are there any other...
  14. Martaine2005

    Can BC548 be replaced by 2N3906 and 2N3904?

    The 548, 3904 are general purpose NPN transistors. The 3906 is PNP.The first two can be inter changed. I think the BC series are common across the pond and 2N are Europe. I could be wrong though. EDIT: The 548 is 100mA, 30V. The 3904 is 200mA, 40V. So compatible within the specs. Martin
  15. Martaine2005

    Just When I Thought it was Going to Be Easy

    Martin
  16. Martaine2005

    Led and battery advice please

    Martin
  17. Martaine2005

    LED chips and smoking

    If it says to use it, use it. It will make a big difference on heat transfer. But that would kill the chip not melt solder. You didn't say what chip or light . Martin
  18. Martaine2005

    How to identify pins

    Martin
  19. Martaine2005

    LED chips and smoking

    Yes, definitely drawing a lot of current to melt the solder. What chip and what light are you referring to? Does it perhaps need heat sinking? Martin
  20. Martaine2005

    How to make the brightness of the LED change?

    I'll leave this open for the experienced members to answer. But I will say that some of the code names in the libraries are rather strange and don't always describe it's function. Adafruit libraries also have lots of examples. I would suggest broadboarding or connecting your LEDs and try...
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