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  1. BobK

    Drone followers

    What a great beginner's project! I believe you will need: some resistors some capactitors some diodes some transistors some chips some motors some sensors Hope this helps Bob
  2. BobK

    Stepper Motor Controllers and voltage regulators

    You are using the wrong driver for the motors. Change one or the other of them until they match. It sounds like this is just a PWM driver. A real stepper motor driver will use a higher voltage and PWM to achieve the desired current in the coils. The voltage to run a stepper motor changes...
  3. BobK

    Advice needed for an 100W LED

    The spec for the LED, 32-36V 3500mA does not mean that it can be run from a voltage source of anywhere between 32 and 36V. It means that it should be run at 3500mA, and the voltage needed will be somewhere in the range of 32 to 36V. This is why you want a current source to run it, the driver...
  4. BobK

    Advice needed for an 100W LED

    If you DC to DC converter has a current limit, set the current for 3500mA and connect it directly to the LED. Since the LED is rated at 32-36V and the converter has a max output of 35V, it might not be able to achieve the full current. Bob
  5. BobK

    Really Need Advice Making Micro Wind Farm

    Gravity does not help with rotating the blades of a windmill! A vertical windmill does not have to be pointed into the wind, it operates with wind from any direction, which is one of its major advantages. Bob
  6. BobK

    sequential LED

    If you are talking about 20mA (or less) individual LEDs, they can be driven directly from and Arduino pin. cjdelphi's answer seems to assume you are using LED strips, which I did not see in your post. Bob
  7. BobK

    Power supply help?

    You are probably looking at an unregulated supply and measuring the voltage with no load. These will read high. Regulated supplies deliver the same voltage over a wide range of currents up to the max rated current. Typically, the 5V wall warts I have tested deliver within 100mV of 5V. Bob
  8. BobK

    xmas present: blinking ring

    How large do you expect this to be? Can you give us a rough drawing with dimensions? The microcontroller that you linked to would require a reflow oven to solder. Not something a beginner would be using. Bob
  9. BobK

    electronic ckt design

    If you want to design something, you have to know what it is. Amplifier is a little bit too vague. For starters: AC or DC? Input level? Output level? Gain? Drive capability? Frequency range? Bob
  10. BobK

    Power supply help?

    That supply puts out both 12V and 24V. You do not need that. Just get one that has 12V and 3A or more. You should be able to find one that looks like a laptop brick supply, no mains wiring required. Bob
  11. BobK

    capacitor

    Sorry, my name is not Google. Bob
  12. BobK

    Beginner assistance

    To reduce the voltage for use in a circuit, you use a voltage regulator. There are 2 kinds. Linear and switching. A linear regulator can be thought of as a voltage divider that automatically adjusts its own resistance depending on the current the load is drawing such that the voltage remains...
  13. BobK

    Beginner assistance

    Welcome to the forum Harry! This section is fine for beginner questions, and we are happy to work with anyone who wants to learn. So, here are some answers: 1. (why not power something with a voltage divider?) Look at the schematic for a voltage divider. You have two resistors, one...
  14. BobK

    Driver required

    The word "driver" does not make sense here. Constant current sources for LEDs are often called drivers, but a constant voltage source is just a power supply. These come in two types, linear and switching. Your transformer based ones are presumably linear. Switching supplies will be lighter...
  15. BobK

    Noise from DC Power supply

    Ground loops in audio gear usually happen when the source and the amplifier are powered from different AC outlets. The problem is that the two grounds are at slightly different potentials due to the current flowing in the various wiring. If this is the case, try powering them from the same AC...
  16. BobK

    Vibrating Metronome Project

    You might be able to make it smaller, lighter, and more energy efficient by giving a small electrical shock instead of using a vibrator motor. I'm not joking here, I think you could come up with enough to feel it without it being too unpleasant. You would do that by having the 555 pulse an...
  17. BobK

    555 timers

    But Ebay is much cheaper for small quantities and often you can get free shipping. Yes, you might get some counterfeits, but I have not had this experience yet. Bob
  18. BobK

    555 timers

    You must value your time very lowly. 555 timers cost about 20 cents. Bob
  19. BobK

    Does a 250w Infra red light will work on a 320w 8.92A 38v solar panel ?

    On 38V the light will run at about 9% of it's normal power, and the filament probably won't heat up enough to radiate any noticeable IR. Bob
  20. BobK

    Home stereo compatible with 12v campervan?

    NiCads charge to about 1.4V, so 14V. Bob
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