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  1. BobK

    Stabilizer for fridge, washing machine and Led TV

    Short circuit is not a symptom. Tell us what you are seeing, and under what conditions, that make you think there is a short circuit. Bob
  2. BobK

    Repeating Toy Hamster Parts?

    Look up “record playback module” on Amazon or Ebay. There are many options. Bob
  3. BobK

    Small low-power light sensor

    The output of that chip is analog, proportional to the light falling on the sensor. You would need a comparator in addition to it to get a digital output. What type of battery are you talking about? 100 mAH is about the output of an LR44 coin cell, which is not going to power an LED for long...
  4. BobK

    Air Conditioner

    Send the coil to anger management classes? You will have to describe the problem better than that. Bob
  5. BobK

    audio to servo control

    You will have to be much more explicit as to how the audio controls the device. Your post could mean anything from: You clap twice to activate the toy. to The toy moves it’s mouth in response to the lyrics and dances to the beat of the song. The former is a simple circuit. The latter is a...
  6. BobK

    DC to DC converter on wind turbine system.

    You need an MPPT controller to get the max power out under varying conditions. Bob
  7. BobK

    Test peak current of a device using shunt resistor and oscilloscope

    Unless the circuit already has a common ground, you need some common connection between them. If the +24V supply is floating you can connect the ground clip to one side of the resistor and a single probe to the other. Bob
  8. BobK

    Battery pack diy advice please

    Huh? You should never replace one of two paralleled batteries, since the two would have different terminal voltages. Both must be replaced with fresh ones at the same time. Bob
  9. BobK

    I want to know about this UPS transformer with 7 wires and how to get maximum power from it.

    Don't know how you got a shock from 6V. Was this battery in the UPS with line voltage coming in as well? That could give you a shock, even a fatal one. Bob
  10. BobK

    Woo-Woo Biocompatible Frequencies

    Frequencies of what? I believe working out at about a frequecy of about 3 times a week is good for you. So, with this post, I have transmitted a frequency that is good for you. Bob
  11. BobK

    Electronic Development

    As will most rotary encoders. Yes, there are some that give absolute position, but that is not the norm. You can get change in position from an accelerometer by integrating it twice. Bob
  12. BobK

    Help for ELF (extreme low frequency) design

    What is the load? BobK
  13. BobK

    Delay Relay

    Unless the delay is 30 seconds, as in this case. Bob
  14. BobK

    IR Receiver Problem

    What signal are you expecting to see on the receiver when you push a button on the remote? Bob
  15. BobK

    Resistor value

    I guess you missed this, in the very first table of the datasheet: LED Current to operate 1 mA Or this line in the features section right underneath: • Only 1mA of LED Current Required to Operate B0b
  16. BobK

    IR Receiver Problem

    Are you just measuring the output with a multimeter? The output is a series of pulses, not a steady signal. You need a scope or logic analyzer to look at it. Bob
  17. BobK

    Self drive car

    Are you serious? Sending a rocket to the moon would be much easier. After you finish that project, come back and we can talk. Bob
  18. BobK

    How to learn pointer in easy steps

    Think about a language without pointers. Lets say you need to write a program that uses a lot of data. Say data about 1 million people. You could have an array declared with 1 million entries, but what if it becomes 2 million people later on? How can you write a program without pointers...
  19. BobK

    Running house LED lights on AC

    Where do you get the info that you are losing 5 to 6W on conversion? That sounds unlikely. A typical 60W LED bulb only uses about 7W and I don't think 5 to 6W is wasted, unless you are counting the efficiency of the LED itself, which is about 20%. Bob
  20. BobK

    Thermistor help

    I have an I3 clone and it is easy to find thermistors sold specifically as replacements for it. Bob
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