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Recent content by iwf

  1. I

    how to convert 5v power supply to 3.3 v?

    USE mc34063 https://www.onsemi.com/pub/Collateral/AN920-D.PDF
  2. I

    How can I make a usb mobile phone charger ?

    Re: usb mobile phone charger It is easy,give you a sample: **broken link removed**
  3. I

    Design a precise Analog Multiplier with amp

    professional Analog Multiplier chip is very expensive,such as AD632. So i want use amp to design a Analog Multiplier by myself,But how can i to consider some parameter about it?
  4. I

    Up to 50A current measurement

    I think if you use toroid,it only sence ac current,no dc.
  5. I

    High speed PCB design

    I think "black magic" is best selection of you start and advanced.
  6. I

    need RLC meter schematic or service manual

    rlc meter schematic I need rlc meter schematic or service manual,pls help me!
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