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  1. Martaine2005

    Supercapacitors anyone?

    The 1N4007 diodes have a forward voltage of about 0.7V. Unlike the schottky of approx 0.3V. Martin
  2. Martaine2005

    How to debug this sound COB circuit?

    Show a picture of the back side of the board. There must be a common connection on that strip somewhere. Martin
  3. Martaine2005

    Supercapacitors anyone?

    The ‘add a circuit’ fuse adapter is connected to what circuit? Some sensitive circuits clamp down to avoid surges or voltage spikes. Try a different circuit like side lights for example. These should work with ignition off. But I’d still go directly to the battery. If you’re on a circuit via...
  4. Martaine2005

    How to? XH-M603 charge controller to charge auxillary battery in van?

    In theory, it could work. Watch this video carefully. Martin
  5. Martaine2005

    Supercapacitors anyone?

    I’d keep it simple and be inclined to run directly from the battery and an inline fuse. Plus switch if needed. You can buy aux fuse boxes for this this very scenario. Martin
  6. Martaine2005

    Old turntable old axial electrolytic

    Replace the old capacitor. It may not leak directly onto the PCB but it sure can go short circuit. Is it worth not doing? Martin
  7. Martaine2005

    Demolition Engineer for WHO?????

    What kind of explosive engineer? Not a very good one!. Martin
  8. Martaine2005

    Reduce LED Brightness

    And the load being just the LEDs?. According to the data sheet, the resistor is internal. And it’s 24VDC. Kind of OTT for just two LEDs. So add another series resistor. Martin
  9. Martaine2005

    KLH 100 table radio manual

    You can try this download here. I have not tried so cannot verify. The KLH200 is supposed to be the same except for 1 speaker. Martin
  10. Martaine2005

    Turbovac driver

    https://www.idealvac.com/files/ManualsII/Leybold_NT10_Operating_Instructions.pdf I read in the link that it converts single phase to three phase. I’ll leave this to the experts here. Martin
  11. Martaine2005

    Reduce LED Brightness

    If your panel indicatators are indeed 24V, they are probably AC or DC compatible. But as @Bluejets already stated, a resistor is one way. For a 2.8V LED @ 15mA, a 1.5KΩ half watt resistor is required. As we don’t know what resistor is in place now or how bright your liking is, you can add...
  12. Martaine2005

    Alt tester newby needs help plz

    Yes, that’s what @bertus said. A centre tapped transformer. Meaning 12-0-12. So 0-12 for 12V or 12-12 for 24V (if it is). The max output current would be difficult to say. Measure the dimensions and look up similar sizes. But going larger won’t hurt as the load is already there. Martin
  13. Martaine2005

    Alt tester newby needs help plz

    Actually, that switch is probably a double pole. Anyway, the transformer is 110VAC input. It reduces the voltage to 12VAC. The diodes rectify the AC to DC. The 12VDC input is direct. I don’t understand what is happening with the resistors or capacitors. Obviously a load, but how it’s wired is...
  14. Martaine2005

    Alt tester newby needs help plz

    I doubt that your drawing is correct. It won’t have AC 110V connected to DC 12V via the same switch as you show. I suspect it’s a 12V (110V-12V) transformer given the fact it has a 12VDC input. But..... use a multimeter to measure voltages when it’s powered by the 12V jack. You might be better...
  15. Martaine2005

    Mini hi voltage generator dc input or ac input?

    These ones Clive plays with are great. I bought 16 some months back. Running from 4 D cells, they really do pack a punch.
  16. Martaine2005

    Replacement LED for Guitar Effects Pedal (Ibanez Tone-Lok CF7)

    Martin
  17. Martaine2005

    Replacement LED for Guitar Effects Pedal (Ibanez Tone-Lok CF7)

    No, you are putting the probes on the same solder pad. Have a look on YouTube for ‘how to use a multimeter. Edit: I’ll find one and link it here... hold on. Martin
  18. Martaine2005

    Replacement LED for Guitar Effects Pedal (Ibanez Tone-Lok CF7)

    You should be able to simply put your meter probes on the LED while in diode mode. The LED should illuminate. If not, reverse the probes and try again. This can be done without de-soldering anything. Just try it. Martin
  19. Martaine2005

    Replacement Sankyo VA700B02 motor

    Hi Ken, seems like this motor has long been discontinued. There appears to be some joy here with a replacement. A Mabuchi RF-310T-11400. Hopefully it can get you going in the right direction. The specs he has are 12V for the same VA700B02 motor though. Certainly worth a read. Martin
  20. Martaine2005

    power supply to 1,5v (clock) AND 3v (LED)?

    I count 7 people who responded and tried to help. Maybe ‘Dora the explorer’ forum has better ideas for the under 10 year olds. Just sayin’... Martin
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