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  1. BobK

    Resistance wire question (nichrome)

    Use a larger wire (non-nichrome) for all but the point. Bob
  2. BobK

    Pulse Amplitude Modulation

    Yes, you can do this with a PIC. Just for kicks once, I put out a modulated 1MHz signal from a PIC using the PWM module and verified I could pick it up on an AM radio. 72KHz should be no sweat. Bob
  3. BobK

    Vreg heat issue and PCB power consumption questions

    But there is something wrong if you already have a large heatsink, and it is getting that hot at 83mA. There should be only about 1.5W to dissapate and anything I would call a very large heatsink should run pretty cool at that. Can you measure the current? Bob
  4. BobK

    Vreg heat issue and PCB power consumption questions

    I think this was Steve's test: How long can you leave your finger on it? Bob
  5. BobK

    Uphill or downhill angle sensor for car

    But the accelerometers will also register acceleration, which the OP said he wanted to eliminate. Bob
  6. BobK

    Resonance

    Why are you talking about a tuner? I thought you were trying to PRODUCE EM waves, not receive them? Bob
  7. BobK

    help for motor from laminator

    Yes, I would also like to know how it works out. Bob
  8. BobK

    looking for the name of a type of header

    Yep, their generic pictures can be misleading. Bob
  9. BobK

    Amplifier for unknown loudspeakers?

    No. Those are the absolute max inputs to avoid damaging the device. Let us know what device you are looking at. A link to the datasheet would be good. The supply voltage generally depends on the output power desired, not the inputs. Bob
  10. BobK

    Amplifier for unknown loudspeakers?

    Any 2W audio amp would do. Bob
  11. BobK

    Uphill or downhill angle sensor for car

    My last post was about the sum of my knowledge of this, but I think you need need both accelerometers and gyros to really determine the orientiation of something that might be accelerating. Bob
  12. BobK

    Math for led calculations

    MV = Megavolts mV = millivolts MA = Megamps mA = milliamps What's 9 orders of magnitude between friends? Bob
  13. BobK

    Uphill or downhill angle sensor for car

    Only a gyro would be able to distinguish acceleration from tilt (rotation). Bob
  14. BobK

    Math for led calculations

    Feedback resistor. You need to choose a resistor that drops 100mV at the desired current. At 1000mA that would be V = I R 0.1 = 1 R or R = .1 Ohm Bob
  15. BobK

    looking for the name of a type of header

    You ordered: 517-929834-01-01 Which is a header with one pin, so you got what you ordered, if not what you wanted. If, for example, you wanted an 10 pin header, you should have ordered: 517-929834-01-10 I buy the 36 pin ones and break them apart myself. Bob
  16. BobK

    can i convert gear motor rpm (100 to 60rpm)???

    Google "motor speed control". Bob
  17. BobK

    Vreg heat issue and PCB power consumption questions

    19V at 250mA is almost 5W of wasted power. A switch mode regulator would be far better. Bob
  18. BobK

    dc car charger

    And you get a free hand warmer as a bonus. Bob
  19. BobK

    I need your help in understanding induced EMF, B fields, C-EMF

    You put current on the armature windings, and they produce a N and a S pole. These are attracted to the S and N poles of the fixed magnets, and the armature moves in that direction. The motion of the coils in the magnetic field causes a voltage to be created in the coils that opposes the...
  20. BobK

    HCH-1000 Humidty Sensor

    The 20 KHz is just the frequency used to characterize the device. If you look at the specs, it can operate from 1KHz to 100KHz. How are you planning on measuring the capacitance? Bob
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