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  1. Alec_t

    Making a BULK Floppy Eraser ???

    If you have an unwanted shaded pole motor (often used for powering small fans etc) you could try removing the rotor and using the stator (possibly with a cut through the laminations to create two distinct poles) for erasing.
  2. Alec_t

    Wheel chair battery

    @Girlonwheels Note that this thread is 4 years old! Welcome to Maker.pro!
  3. Alec_t

    Landline (VOIP) Caller ID

    Perhaps that depends on country/provider. I'm in the UK and have a VOIP land-line phone contract with caller ID.
  4. Alec_t

    Why amp is not stable while charging a 3s battery

    You may be overloading the supply. Post links to the amp and its supply. Post a schematic of your amp and we might have a clue.
  5. Alec_t

    Why do they use a voltage divider in this instance?

    It is to provide a reference voltage for the circuit, which is providing a nominally constant current through the LEDs. Welcome to the forum!
  6. Alec_t

    CD4001 LED flasher circuit help

    Agreed. For one thing, not all breadboards have the same internal connections, e.g. contact grouping for the supply rails.
  7. Alec_t

    Forum Upgrade & Merging with Maker.pro

    Let's see if it works in the UK with Win10 and Firefox. The following text should read as 10 dollars, 20 dollars :- 10,20. Edit: Nope, didn't work, but in Preview mode it looked ok.
  8. Alec_t

    DC Motors and speed control

    That too has the torque/speed trade-off.
  9. Alec_t

    DC Motors and speed control

    Agreed. For a given Wattage motor there is a trade-off. You can only increase torque at the expense of rpm. For any given motor there is a fixed space for the windings. Torque is proportional to the product of coil current and number of coil turns. So increasing the number of turns means using...
  10. Alec_t

    Forum Upgrade & Merging with Maker.pro

    Could we please have a higher colour contrast between the buttons for the previous/current/next displayed page? On some screens, or in poor light, or for members with less than perfect eyesight, the present buttons are virtually indistinguishable.
  11. Alec_t

    Need help designing a solar powered rechargeable device

    The cell chemistry is also important. Are these NiMh?
  12. Alec_t

    New Format

    'Like' now visible. Thanks for the fix. It would be nice to have a drop-down list for inserting commonly-used scientific/mathematical symbols and Greek letters without having to use Latex.
  13. Alec_t

    Swapping diode for P-MOSFET: reverse spike protection

    You're right. I mis-read the intention.
  14. Alec_t

    timer circuit?

    There are plenty of programmable timers advertised on ebay. Almost certainly cheaper to buy one than build one.
  15. Alec_t

    Swapping diode for P-MOSFET: reverse spike protection

    No. The P-FET drain and source are the wrong way round.
  16. Alec_t

    New Format

    No 'Like' button on my Lenovo Win10 laptop. It seems the extra buttons are visible only to moderators.
  17. Alec_t

    Forum Upgrade & Merging with Maker.pro

    Seems to be the philosophy of a well-known OS producer too. :)
  18. Alec_t

    can I charge 12.8-volt battery with a 15v charger

    You need a BMS that monitors the 3 cells individually, to ensure balanced charging.
  19. Alec_t

    Have 3,3V need 15V

    The Arduino pins' logic low level is ground (nearly). Just what you want. No, it doesn't. It reduces the supply voltage by about 0.7V.
  20. Alec_t

    Have 3,3V need 15V

    The light control module 5221 has an input clearly marked as AC (~). This AC supplies the diode, the cathode of which is connected to the lights. Hence the lights receive half-wave rectified AC, i.e unsmoothed DC. This DC could be used as the supply for the level-shifter circuits. If the lights...
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