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  1. C

    Transformer output

    It must be an AC voltage - not from a battery.
  2. C

    Oscillator test

    You place an umvelo project near it and it lets you know the oscillator is working.
  3. C

    incorrect load on soldering iron transformer?

    You can buy a temp controlled soldering iron for $12.00 posted. I have used one for 5 years.
  4. C

    Loss of voltage with MOSFET

    have you connected the FET around the wrong way?
  5. C

    Powering a mobile FM transmitter

    Small 12v batteries are much handier to have around, easier to buy, cheaper, and will be lighter than a 7AH battery.
  6. C

    Powering a mobile FM transmitter

    The actual current required by the Tx will be just over 1 amp. Use 2 x 12v batteries in parallel of about 3-4 amp-hr.
  7. C

    reversed photodioded LED? help out! simple!

    How can someone so young as Luis Costa understand electronics?
  8. C

    Arc Welder Simulator

    It's not a flashing LED but a flickering LED.
  9. C

    Arc Welder Simulator

    The $6.00 kit is very unrealistic. You can buy a flickering LED for $1.00 and drive another super bright white LED via a transistor to get a much better effect. This very simple circuit replaces a very complex circuit because all the random flashing is done via a microscopic microcontroller...
  10. C

    FM receiver and transmitter

    It's a lot more difficult to get the received tone to operate a relay using your modules. It is much better to buy a 303MHz link that operates a relay These links are about $10.00 on eBay.
  11. C

    Where can I get LCDs that are used in calculators/watches?

    Buy $2.00 scientific calculators from the $2.00 shop.
  12. C

    12v relay with time delay and reverse polarity

    " Am I making a bit of sense now?" Not really. The terminals of a relay can be wired so that a motor turns clockwise when the relay is energised and turns anticlockwise when the relay is not energised. You need another relay to supply power to the motor to be able to turn the motor OFF. You...
  13. C

    12v relay with time delay and reverse polarity

    Your request is not clear at all. Can you repeat it in Pigeon English?
  14. C

    Transformers in parallel

    Connect one of the leads to the other transformer. Connect the other lead to a 1 ohm 0.25 watt resistor and the other end to the other lead of the other transformer. Turn them ON. Feel the resistor.
  15. C

    Simple stall over current 12v dc motor protection?

    Simply detect the brush noise from the motor to turn off the supply.
  16. C

    4 players quiz game using relays

    There is already a circuit on the web using relays for 4 players.
  17. C

    4 players quiz game using relays

    It does say an ELECTRONICS forum and not an ELECTRICAL forum.
  18. C

    Robot Arm Question (Battery Related)

    Use these new fangled things called li-Ion cells 3.7v or NiMH 4 x 1.2v = 4v8
  19. C

    4 players quiz game using relays

    It's a very clever circuit but you are just going backwards for all of us. Go back to someone living in 1920 ask them. Relays for them would have been the latest invention. It's a bit like you asking us to produce a 128 bit memory with ferrite rings.
  20. C

    Robotics

    Everything you want is free on the web. Just use Google.
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