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  1. BobK

    Solar yard light stopped working

    That sounds about right. The battery could be bad, or simply not charging. Have you checked the connections to the solar panel? Bob
  2. BobK

    Using different inputs to access mp3 player's different tracks

    You don't need an encoder with the module I linked. It says it has 9 inputs,. each of which will play a different track when activated. I requested a data sheet from the seller, and I got one. In Chinese. It looks like you ground A1 to play the first file, or A2 to play the second file, etc...
  3. BobK

    Capacitor to smooth rectifier output?

    The size of the capacitor needed depends on the current, not the voltage. You have not given us any clue about the current. Bob
  4. BobK

    What Spectrum Attracts Mosquitos?

    Where did you come up with that? All mosquito traps I have seen use UV, which is outside that range. Bob
  5. BobK

    Solar yard light stopped working

    The solar lights that operate off a single 1.2V battery use a boost converter to up the voltage. You can light the LED directly from two cells producing 2.4V, so all you have proven is that the LED itself is not damaged. I have fixed two of these and the failure mode was different on each. On...
  6. BobK

    120VAC to 12VDC Power Quality Problem? HELP!

    That I suspect that controller is what is acting up. Bob
  7. BobK

    120VAC to 12VDC Power Quality Problem? HELP!

    Are these LED strips wired directly to the power supply, or is there some kind of controller in between? Bob
  8. BobK

    Voltage Doubler problem

    The watt rating of a resistor is for continuous operation. They can survive much higher power for short periods. I would not assume that the resistor is really burning in this circuit if it is built correctly, I would look for a short. Bob
  9. BobK

    How to build Circuit

    The only way to get more current out than in is with a SMPS (switch mode power supply). Bob
  10. BobK

    Playing with transformers and resistors....

    Resistors can only be used to reduce voltage when the current is constant. For a general purpose power supply, you need a regulator to reduce voltage. Use and LM317, which is a variable regulator or 78XX which are fixed regulators. Look these up to see what the circuits look like. They are...
  11. BobK

    Old Yamaha audio spare parts (new)

    Looking up one of them in your photo, 2SC1345, I got this: http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.X2sc1345.TRS0&_nkw=2sc1345&_sacat=0 Sometimes, old, hard to get parts can sell at a premium. But don't get too excited, there was anther offer of 4 for...
  12. BobK

    LED strip power supply

    Or you can place a PWM controller between the 12V power supply and the LED strips. Bob
  13. BobK

    Watts, Amps, and Volts Explained

    Current is movement of charge. Charge is measured in Coulombs. A movement 1 Coulomb of charge per second is 1 Amp, which is the measure of current. Voltage is measured between two places. It tells you how much energy an charge gains or loses when moving from point A to point B. It is...
  14. BobK

    Optical Encoder Issue

    Tell us about the encoder. Is it mechanical? If it is, and it simply closes a switch periodically when you rotate it, have you used a pull-up or pull-down resistor on the input to the Arduino? If not, the input is floating whenever the encoder switch is open and could cause this behavior. Bob
  15. BobK

    Using different inputs to access mp3 player's different tracks

    Here is an example of the type of module I referred to. It has 9 inputs that will play 9 different tracks. With encoding, it can play 31 different tracks...
  16. BobK

    Using different inputs to access mp3 player's different tracks

    I think this is what the OP means (please correct me if I am wrong) He has an MP3 player, with a 5 button interface. He can manually select and play one of multiple tracks by pushing a sequence of these buttons (such as home, down, down, play) to play track 3) He wants to make a device that...
  17. BobK

    PCB: panel vs single board

    I have had multiple copies of a board manufactured to fit in a specific size the manufacturer wanted, then cut them apart myself. Are you asking the manufacturer to cut them apart? If so, that is likely the problem, it is an extra step for them. Bob
  18. BobK

    Optical Encoder Issue

    My guess would be that you don't have a common ground between the encoder and the Arduino. Bob
  19. BobK

    Clarification on LED millicandela and light output

    It is odd that such a narrow viewing angle LED would be used for this purpose. As KMoffet already said, you cannot make the second LED have the same visual effect from all angles as the first one. That said, I don't think it is going to make much difference in how well it performs if you...
  20. BobK

    PID for Kiln Control

    But, what if he is a reptilian? Bob
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