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  1. BobK

    UV Sterilization Light

    A neon bulb is not the same thing as a starter. I doubt that replacing that with a neon bulb will help you. See here: http://home.howstuffworks.com/question337.htm Bob
  2. BobK

    Which battery is suitable?

    Are there commercially available battery operated tools? If not, I would think that means it is not feasible. If there are, what type of batteries do they use? In any case Lithium batteries have the highest energy density of any common batteries, so they would give you the lightest and...
  3. BobK

    DC Voltage Regulators

    Pin 1 (or 3 or 4) goes the negative of the 60V Pin 2 connects to the 5.6K resistor Other side of resistor connects to the positive side of the 60V Pins 6 and 8 go between the power and the light, like a switch. Other pins left unconnected. Note that the datasheet refers to pin 8 as pin 7 in...
  4. BobK

    UV Sterilization Light

    The heaters are only used to start the ionization process in the lamp. Once it is started, current flows between the two ends and keeps the gas ionized, and the heaters are turned off. Bob
  5. BobK

    Audio signal to speakers

    The range of voltages is not related to the frequencies being reproduced. The range is related to the loudness. The audio frequency is produced by a voltage that varies at that frequency. A 1KHz sound will be produced by an alternating voltage at 1KHz. This might be at 1V for a soft sound or...
  6. BobK

    German record player plays at wrong speed in Canada

    Here is a perfect application for 3D-printer! Bob
  7. BobK

    DC Voltage Regulators

    I was not talking about running the porch light off the 60V signal. I was talking about running it off the same line that runs the light in the motion sensor, which should be 120VAC. This would be the output of the relay in the motion sensor. Solid state relays operate by running an LED to...
  8. BobK

    Mosfet selection for switching a solenoid

    The lowest one. Edit: When switching at 16Hz, the gate capacitance is not going to matter, at much higher frequencies it would. Bob
  9. BobK

    DC Voltage Regulators

    This is very strange, I would be surprised to find 60VDC used in a motion sensor run off 120VAC. What is the rating of the relay used in the motion sensor? If it is rated at high enough current for both lights, why not just run the output of that relay to the porch light? If that is not...
  10. BobK

    German record player plays at wrong speed in Canada

    I doubt that they would us a different motor for 50/60 Hz, more likely a different pulley. Bob
  11. BobK

    Delay timer circuit for a motor.

    Can you measure it? Bob
  12. BobK

    Stage Line 500W amp repair project

    It could be the resistor that is shorted as well. You could try pulling one leg of the resistor and check it. If it reads good, then pull the transistor and check it. Bob
  13. BobK

    Exchanging data variables?

    Great! You have got it working now. Now, how about a little refinement? You might notice that you have several lines that are exactly duplicated in multiple places. See if you can make these lines appear only once. This not only makes the program shorter and more elegant, but, if you decide...
  14. BobK

    Stage Line 500W amp repair project

    It looks to me like either R108 is shorted or Q46 is shorted emitter to base. Bob
  15. BobK

    Audio Amplifier problem

    Adam, Just visit lmgtfy.com and you can create a link for any search you want. Used in forums all around the world. Bob
  16. BobK

    Delay timer circuit for a motor.

    Well, you answered most of Kris' questions, but not this very important one: What are the specifications of your motor? Bob
  17. BobK

    threshold voltage of a MOS transistor

    Okay, so the DC output is the only signal you have access to, and it can vary between 0V and some limit you have not specified. You have only told us what you want to do on 3 of these voltages, 0V, 0.5V and 1.0V. What is supposed to happen on any other voltage? And when you say 0.5V or 1.0V...
  18. BobK

    Exchanging data variables?

    So you started with a max of 0 and min of 99. Your guess should be the middle of the range which is (max + min) / 2 which is 49 (not 50 because of truncation in integer divides). Call this number guess. So, say the user says guess (49) is too high. Then you know that the number cannot be 49...
  19. BobK

    threshold voltage of a MOS transistor

    So it is connected to an analog output on the microcontroller? When you say "sends nothing" do you mean the output is at 0V? What happens when the output is at 1.5V, 2.7V or are these not possible? Do you have control over the programming on the microcontroller? If so, is there an extra...
  20. BobK

    threshold voltage of a MOS transistor

    Be aware that the threshold voltage is where the MOSFET just begins to pass any current, typically rated as the voltage at which 250uA will flow. The MOSFET cannot be considered ON at the threshold voltage (unless you only want 250uA or less). I think what you want is a comparator that can...
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