Search results

Search Forums New Posts
  1. Tha fios agaibh

    DC MOTOR QUESTION

    I would want one motor hooked up like this.
  2. Tha fios agaibh

    Modernise old rotary telephone

    I expect he wants to do it just for the novelty of it. And some of us on this site are a little geeky with how we spend time. Lol Back in the late 80s I used to have a wrist watch that would dial the phone by repeating the touch tone stored in memory. You just held the mic over your wrist and...
  3. Tha fios agaibh

    Modernise old rotary telephone

    Of course this rotary phone would not look original with a power cord or usb cable hanging from it. Lol
  4. Tha fios agaibh

    Modernise old rotary telephone

    I for one would not pesue it. But if the op has the determination, It's certainly possible.
  5. Tha fios agaibh

    Modernise old rotary telephone

    I'm not an Arduino guy either, but I imagine the click signal from the original dialer mechanism could be fed to an input that a microcontroller would then register (count clicks) and then convert the count to the equivalent touch tone (oscillator ckt) for the equivalent number. I'd imagine...
  6. Tha fios agaibh

    Car Battery Powered House Ideas, Questions

    And the life of lead acid batteries is only about 5 or 6 years. Also, it would cost a small fortune wiring heavy gauge wire from all the batteries. Also, need to add roughly 20% extra to account for heavy inductive loads. Inductive loads can draw >8 times their normal current draw at start up...
  7. Tha fios agaibh

    Just for Fun

    Too much power blew it up. A red led runs on about 2 volts and draws about 20ma.(depending on led) If you want to run it on a 9v battery, the current needs to be limited. If you add a resistor that drops the voltage difference you would get (form ohms law); 7volts divided by .02amps that equals...
  8. Tha fios agaibh

    DC MOTOR QUESTION

    Seems like one motor will always have more torque than the other. The rpm of the motors will vary and the gearbox will multiply the rpms making the imbalance between axles even greater. Seems like it'd be better to mechanically tie the axles together and use one big motor. If the gearbox is...
  9. Tha fios agaibh

    Battery Powered Vacuum repair

    Probably right Colin, but it would not be wise to only replace the shorted cell.
  10. Tha fios agaibh

    Negative Impedance Converter

    Why is the input (Eingang) labeled Vcc? I think of Vcc as being the + power source. Also, quelle talked about negative impedance or -5 ohms. Shouldn't that be conductance that's measured in mhos?
  11. Tha fios agaibh

    Car Power Inverter

    Good point. Adding a choke would help, but would probably still sound like garbage. John
  12. Tha fios agaibh

    Car Power Inverter

    I would be cautious about that chinese inverter. It can have a significant load on your electricial system. You may need to get a more powerful alternator or larger battery to keep up with the current draw. You will likely have fluctuations in voltage on the ac side. If you turn your car off the...
  13. Tha fios agaibh

    Battery Powered Vacuum repair

    And, likely the main reason NiCad batteries die quickly, is because people don't follow that discharge/full recharge cycles. Oh, and when we say "throw them away" we really mean recycle please. Btw, I like that line Hop; "(It's) only convenient until it isn't" Lol. John
  14. Tha fios agaibh

    Battery Powered Vacuum repair

    You could do that but then you'd have to alter the charging circuit. If you run the motor off an external 6vdc ps you could then measure how much current the motor is drawing. Again, by the time you but the parts to fix it you could buy another vacuum. Btw, welcome to the forum Justin. If...
  15. Tha fios agaibh

    Looking for recommendation for a good soldering iron

    I've had an ungar iron for 30 years, still in excellent shape. Not sure if one brand is much better than the rest. I think the most important thing is keeping the tip clean.
  16. Tha fios agaibh

    Battery Powered Vacuum repair

    I have one of those in my garage. (Piece of junk) In my opinion it's not worth messing with. You can find replacement batteries online but there is a good chance the motor is shot. If you have a 6vdc adapter disconnect the batteries and try hooking up directly to the motor. My guess is the...
  17. Tha fios agaibh

    Just learning the ropes

    Sometimes we over think these things, but it's also good to be careful. Remember; If you are in the K range, just move decimal 3 placed to right for ohms. Or, 3 places left to change ohms to K ohms.
  18. Tha fios agaibh

    My Introduction Thread

    Nice post hop. 73 to you too.
  19. Tha fios agaibh

    My Introduction Thread

    Looking forward to seeing you on the forum Andrew.
  20. Tha fios agaibh

    trying to understand amp limits? (10 vs 15 vs 16A)

    A common point of confusion is the difference between nominal voltage and rated voltage. Nominal voltage is the voltage a device or equipment is designated to run on. (The voltage the load should run on) Rated voltage is the maximum voltage that can be safely handled. (Usually pertaining to the...
Top