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  1. Martaine2005

    looking for a "center-bore" motor

    Well excuse me for trying to get more info from you! You said "all I want to do is spin a disc with a hole in it" So, do you need that hole while it is rotating, or can it be plugged? Like a record has a hole for the centre spindle or a cd player has a centre plug to keep the cd aligned!! Can...
  2. Martaine2005

    Help?! Toy keyboard with guitar input

    I don't think this will work. You can certainly try it. But the on-board chip is for electronic instruments, not electric instruments like a guitar. The LM386 chip seems to be the choice for guitar amps. That schematic is here. Martin
  3. Martaine2005

    15kV Fuse?

    Hello, This seems very similar to General Electrics current limiting fuse type EJ-1. But I am not sure about the size or where to get them. Martin
  4. Martaine2005

    Cassette player: cannot locate where to connect the wire

    That looks like a crimped connector and most likely goes to chassis ground. If you place the cassette near it's real location, you should see a spade terminal within reach of the connector. Fortunately the wire is short so finding it should be fairly quick. Look on the parts that have been...
  5. Martaine2005

    looking for a "center-bore" motor

    Can the hole be plugged like a cd player? Or do you need the hole to look through? Martin
  6. Martaine2005

    charging systems question

    I think the Dr must have changed the prescription for HAPPY Pills!! Well done Colin, that was a lovely explanation. Martin
  7. Martaine2005

    CCTV smart detection concept

    Hi max, I think you need to look up FLIR and RAPID RECAP systems for CCTC. Martin
  8. Martaine2005

    Can a clock pendulum be slowed down by adding a resistor to the PSB?

    I think that gravity needs to be overcome here. And as Duke suggests, only can be done mechanically. Even if you was to put a 20 turn variable resistor in series with the coil, it would speed up or slow down but by a tiny amount. As has already been explained in the above posts, the coil keeps...
  9. Martaine2005

    So, how many "watts" is a 9-volt battery?

    Hi Flurng, The link 'minder' supplied is a PP3 9V battery. Although Duracell don't seem to say 'PP3'. Martin
  10. Martaine2005

    Help?! Toy keyboard with guitar input

    Your over drive pedal will hit distortion levels. For obvious reasons. Are they mains powered or battery?
  11. Martaine2005

    Help?! Toy keyboard with guitar input

    The output voltage of magnetic pickups varies between 100 mV rms to over 1 V rms for some of the higher output types. A hard strum on all 6 guitar strings can produce a larger output voltage swing, typically peak voltages of +/− 5 volts for single coil pickups and +/− 10 volt peaks on dual coil...
  12. Martaine2005

    Akai MPK49 repair

    Chris, that is a classic..:) I can before midday. Then the Belgium beer shows me I cannot!!:D Martin
  13. Martaine2005

    Help?! Toy keyboard with guitar input

    Hi Corey, The data sheet is here Martin
  14. Martaine2005

    Variable Capacitor Capacitance

    Hi pccrp, I couldn't find anything on the 25y. You might be better to purchase a cheap £8 Ebay ESR kit and try it out. Martin
  15. Martaine2005

    Novice seeking help to get 12 V CPU cooler fan running

    I think you may be right.
  16. Martaine2005

    Novice seeking help to get 12 V CPU cooler fan running

    OK , I couldnt hane put that bettter myaself
  17. Martaine2005

    Have to share pic

    Those names crack me up.. You probably have high speed fibreoptic, but the squirrels have chewed your cables.:) Martin
  18. Martaine2005

    refrigerator causes power surge

    Funny.. I remember asking the same question.. Martin
  19. Martaine2005

    Novice seeking help to get 12 V CPU cooler fan running

    Hmm, maybe I don't understand the question properly. That is a valid point Gryd3, The HDD enclosure might only work with the HDD connected too. Although all mine have external psu's and are just standard on/off. Still doesn't explain why the fan wont work on 9v either. I agree that 30ma is very...
  20. Martaine2005

    Novice seeking help to get 12 V CPU cooler fan running

    Hi Puu, The datasheet for the fan is here It has a start voltage of 6v and a recommended running voltage of 12v. The answer to your question is 'YES', it will work with an 11v - 500ma pack. As Gryd3 has said, if it works on a car battery, it should also work on a small battery. I have my case...
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