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Recent content by wat007

  1. W

    Multiplexing two SPI Master

    Thanks KlausST, I will post my results soon.
  2. W

    Multiplexing two SPI Master

    Is it possible to switch two master SPI lines using Quad 2:1 multiplexer like (74HC257)? I want my two Master devices to access a single SPI slave (Flash). SPI speed is 4MHz. Please see attached schematics. The reason for this is that, I have an MP3 module (master2) which already has a flash...
  3. W

    Questions: NIMH 3-AA Charger Temperature Control

    Hi All, I am planning to build 3 (connected in series) AA battery charger which is MCU-controlled. I just want to know the basic. Each has 1600mAh capacity. Voltage is 1.2V nominal to between 1.4 to 1.6V after charge. My questions are: 1. Can I use USB port for charging 3 AA battery NIMH? Will...
  4. W

    Best Regulator for Li-Ion Battery

    yes, but it so expensive for my product. I am designing a simple toy so discrete or simple component should be my first option. :)
  5. W

    Best Regulator for Li-Ion Battery

    @Audioguru, that is an option. Any other ways? Thanks
  6. W

    Best Regulator for Li-Ion Battery

    Hi KlausST, I will give post drawing when available. Regulated supply should power MCU and 2-3 more ICs (probably around 100mA, Iout). - - - Updated - - - Hi Audioguru, I'll go with LDO and planning to use LD6836TD/30H. In disconnecting battery,can schmitt tigger do the job? I want to make it...
  7. W

    Best Regulator for Li-Ion Battery

    Hi, I am planning to use Single Li-ion for my board with MCU and other ICs. Li-ion voltage range is from 3.0V to 4.2V. Since some of my ICs' supply voltage should not exceed 3.6V, i am planning two regulate the voltage to at least 3.0V. My questions are: 1. What is the minimum input voltage if...
  8. W

    Infrared Receiver Circuit

    No, I exposed the receiver to direct sunlight and still it is working.
  9. W

    Infrared Receiver Circuit

    Understand that but just curious why some remote control system (transmitter and receiver) can still work outside directly facing sunlight. - - - Updated - - -
  10. W

    Infrared Receiver Circuit

    So is there something blocking the sunlight in most DVD IR receivers? Mostly I can see something color brown? Is it a filter?
  11. W

    Infrared Receiver Circuit

    Hi Surendhar, I will try this later but may I know what if sunlight is always present and it will "fully" turn on my IR detector diode. Will the full ambient light (from the sun) cover the modulated signal?
  12. W

    Infrared Receiver Circuit

    I have that in the transmitter side. How do I separate the ambient/sunlight IR from the modulated one in the receiver side?
  13. W

    Infrared Receiver Circuit

    My DVD with IR emitter and sensor will work outside expose to sunlight. It must be possible.
  14. W

    Infrared Receiver Circuit

    Hi All, I am trying to build a remote control receiver that can be used outside the house. Thus, this this will be exposed to sunlight. How does my signal be resistant (mechanically or electronic solution) to infrared emitted by the sunlight. Can i use simple IR emitter and detector diodes...
  15. W

    Infrared emitter and detector LEDs

    Hi FvM, Thanks. What is the main factor of the IR emitter's range? Is it the forward current?
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