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  1. Martaine2005

    AC Diode

    Hi Duke, I don't think he means running an AC pump on DC. If I understand him correctly, he now wants to replicate his DC circuit but with AC instead Martin
  2. Martaine2005

    Recycling an old phone/fax machine any ideas?

    Haha, looks like that comment promoted me...VIP. Do we have a special handshake now? Martin
  3. Martaine2005

    Increasing Current

    Hi Electro, that is very confusing to me too. If the battery is 1.5v and the resistors are 100Ω. 1.5 / 100 = 0.015. How are you getting 0.3A? And adding all three resistors is 0.045. How are you getting 1.5A? EDIT: How are you measuring this? What settings on the meter? Martin
  4. Martaine2005

    Velleman Voice Changer Mod

    No probs Martin
  5. Martaine2005

    Velleman Voice Changer Mod

    Oops, that's very true. Hehe,, If you buy that TOO, you'll have all three and be able to do all of it.:D
  6. Martaine2005

    Velleman Voice Changer Mod

    The unit I linked to will do exactly what you want. One speaker to both units. And also play pre-recorded samples / messages too. The cheaper unit doesn't have inputs for pre-recorded files either. De nada Martin
  7. Martaine2005

    Velleman Voice Changer Mod

    Hi, what voice changer kit is it? Was it a kit version? Mk171? The above voice changer has a speaker output. The other unit I linked to has a line input and speaker output, So shouldn't be a problem getting them to work together. Martin
  8. Martaine2005

    Velleman Voice Changer Mod

    Hi Rushmore, you should have really bought a voice recorder / module. But you can get one of these. And use it with your voice changer. Martin
  9. Martaine2005

    Denon AVR2105 Help Please if Can? New Member Hello to All.

    Hi justme, Have you looked at the service manual? You seem to have enough knowledge fault find. Have a read of the manual here. Might take 5 or 6 seconds to load. Martin
  10. Martaine2005

    Magnet Alarm Circuit Board, Battery Power

    That piece looks just like the tip of a Volt Stick with the pen section removed..Obviously isn't. Martin
  11. Martaine2005

    AC Diode

    Not really sure I understand the question! But a very quick look on the www, revealed a diode alternating current. Martin
  12. Martaine2005

    Recycling an old phone/fax machine any ideas?

    I think he was quite adament about it being a 70s board. This is most likely a late 90s / early 2000 machine. Martin
  13. Martaine2005

    Recycling an old phone/fax machine any ideas?

    Hi Robert. some interesting items you have there. You could make a nice DTMF house phone with caller ID. Or a nice house phone with caller ID and answer phone. Or a nice house phone with caller ID, answer phone and a black and white photo copier. You could even build a nice house phone with...
  14. Martaine2005

    Transistor switching on another voltage supply

    Sorry can't find any of my old city and guilds books yet. But possibly davenn, Bobk or Colin will be able to shed more light on this..Oh and of course my favourite encyclopedia Howard. Martin
  15. Martaine2005

    Transistor switching on another voltage supply

    No, it was when I was at college sitting OR failing my part 2 electronics. Martin
  16. Martaine2005

    Transistor switching on another voltage supply

    The whole point of isolating circuits is to completely isolate them.. No 'common' either. It would be an independant circuit controlled by the first low voltage circuit. For safety reasons no voltage/current can be fed back to the controlling circuit. Martin Ps, I will try and find something I...
  17. Martaine2005

    Transistor switching on another voltage supply

    I think you read me wrong.. I meant VERY clever. They used to use light bulbs to isolate circuits. Martin
  18. Martaine2005

    Transistor switching on another voltage supply

    Very clever. Using the bulb as an opto isolator. And bloody pricey.. Martin
  19. Martaine2005

    Turntable Spinning Fast in Reverse

    Yes, you lost me for a while. I was refering to an ECM. They have a AC to DC converter/rectifier board on the stator. That, I think is for AC fed equipment. So what I was trying to explain was that the TT was supplied by DC, therefore no point in a AC to DC board in the motor. I am probably...
  20. Martaine2005

    Turntable Spinning Fast in Reverse

    You are welcome Martin
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