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  1. BobK

    2ch remote with l298n and nema 17 connection

    A stepper motor needs a constant stream of pulses in order to run. You don't have anything that will provide that, unless you plan on pushing a button on the remote 200 times for each rotation of the shaft. Tell us more about what you are trying to accomplish. Bob
  2. BobK

    Hooking wall mounting car headlights to music

    Hook them in series to a 500W car audio amp that you can buy for < $100 on Ebay. You will also need a 12V 40A supply. Bob
  3. BobK

    probs with amps

    Once you get the pinout right, that is an awful lot of power to run headphones. Bob
  4. BobK

    SONY deceives every Taiwanese consumer for buying SONY AZ1VR/W Action Camera !

    I hate to tell you this, but a camera designed to be used in air will not focus under water because the water changes the power of the lens. To use such a camera underwater, you need a water tight enclosure so that the lens is actually in air. Claiming that it is waterproof means that it will...
  5. BobK

    Hooking wall mounting car headlights to music

    Easiest way might be to hook them up to an audio amp through a transformer. How much current do they draw, and at what voltage? Bob
  6. BobK

    High and Low switching at the same Time

    Any transformer will give you a floating supply. A small 12V transformer would be good. Just don't connect the ground to the circuit's ground. Bob
  7. BobK

    battery powered heater

    Do you realize that at 60C the battery will be depleted in 1 minute? Bob
  8. BobK

    Led Lamp

    Need I mention that the power supply must be enclosed to prohibit contact by humans, who might otherwise become ex-humans? Bob
  9. BobK

    Voltage switch circuit

    It's worse than that. If you put 5V, without limiting current on a 3V battery you will likely start a fire. Charging batteries is complicated and should be left to those with some knowledge. Bob
  10. BobK

    Microcontroller controlled by pushbutton for LED flashlight

    Okay. At 67 cents Qty 1 vs 50 cents, I can see that! :) Bob
  11. BobK

    Microcontroller controlled by pushbutton for LED flashlight

    Adam, Which microcontroller? The PIC10F320/322 has the extended midrange core, and comes in 6-pin SMT. Bob
  12. BobK

    Capacitor confusion

    Capacitors have many uses in electronics, including passing AC while blocking DC, timing circuits, filters, tuning circuits, suppressing voltage spikes, suppressing electrical noise, shifting phase to start an AC motor, limiting current in AC circuits, and the list goes on. They do store...
  13. BobK

    Need some advice on an LED project

    There is nothing to ensure this. Each lamp will have a slightly different forward voltage, causing the current to be divided unequally. As I stated before, the forward voltage also depends on temperature, so, unless the temperature of each lamp is kept identical, the division of current will...
  14. BobK

    High and Low switching at the same Time

    You could use a floating supply for the high-side gate and an opto-isolator. Bob
  15. BobK

    Controlling a UK mains supply from a Raspberry Pi Piface

    Yes, if the Pi could provide a continuous 5V signal for the entire time the lights should be on, then all you need is a relay to control the lights. Bob
  16. BobK

    Controlling a UK mains supply from a Raspberry Pi Piface

    Okay. But it seems to me that a trivial software change could save you having to make extra specialized hardware. Are you unable to make changes to the program? Bob
  17. BobK

    Controlling a UK mains supply from a Raspberry Pi Piface

    I don't see how this works. If you toggle the lights each time the lock is opened, wouldn't the lights go out when a second person enters the room? Bob
  18. BobK

    High and Low switching at the same Time

    Look for high and low side drivers from International Rectifier. They have 600 and 1200V offset models. Bob
  19. BobK

    Echolocation project

    Hi, and welcome to the forum. Yes, it is possible. There are cheap ultrasonic sensors that will tell you how far you are from an obstacle. You would need a microcontroller to operate the sensor and then cause the car to change direction. If you have no experience with microcontrollers an...
  20. BobK

    Display contents of a mobile phone on a monitor!

    You can also do it with the Amazon fire stick if the monitor has HDMI and the phone has a recent version of Android. Bob
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