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  1. N

    Choosing +/12V dual power supply or single 24V

    Does it the same meaning when the differential voltage is 24V? it depend on the way we choose the common point, and which case we use dual power supply?
  2. N

    Surge lighting protection for 24V circuit

    I having a circuit is equip with isolate dc dc 24v to 5v to power my embedded circuit. The distance from power supply to my circuit is 50m (out door). What kind of device i should choose for protection: mov, tvs, efuse, gas tube..
  3. N

    Mistake with opto coupler

    This is the first time I work with opto coupler, the did-advantage of this type isolation is life-time. Is there any note to keep in mind to avoid defect? any one has experience?
  4. N

    How to select common choke?

    I intend to use common mode choke for DC 12V power supply? I wonder how it effect?
  5. N

    Dual isolated power supply

    Hello, I need dual isolated power supply 12V and 5V. I intend to use dual output power supply +12V -12V. In the -12V I connected inverse polarity and using Dc/DC to make +12V and +5V isolated? is it possible?
  6. N

    Shield of RJ45 (Ethernet connector) right connection

    When design RJ45, they having pin for shielding. I look for some design they connect to some of variations: 1. Inductor to GND. 2. resistor 1M // cap 100nF to GND 3. 0hm // cap 100nF to GND 4. 100nF cap only. 5. Connect to GND. Which connection is correct? and why?
  7. N

    Isolated IO method? Capactive, opto or magnetic?

    I don't know how to choose capacitive, opto or magnetic to isolate fpga I/O pin. All of them are good! But which is the best?
  8. N

    High speed signal could refer same reference gnd?

    Is it posible for 2 high speed signal using same Gnd? Suppose stack up like this: Top1 Gnd2 Sig3 Gnd4 Sig5 Gnd6 The case sig3 and sig5? I'm afraid of return current on gnd4 conflict?
  9. N

    too hot if irrush current without NTC

    In my circuit using just NTC (norelay) to limit irrush current into a toroid transformer, the issue is NTC is too hot 150 degree. Is it OK for long term use? Or I must use a by pass relay.
  10. N

    Irrush current limit before or after rectifier diode bridge

    My circuit including toroid transformer from 220V to 12VAC. I need implement irrush current circuit, but I wonder to implement before toroid transformer or after rectifier diode bridge? which is better.
  11. N

    Ultralow noise power supply design

    I need design ultra low noise supply for analog RF, input is 12V. I need 2.5V and 1.2V so any suggestion to implement my design.
  12. N

    Maximum temperature allowable for FET?

    When I measuring temperature on the surface of the FET, it up to 95 deg? I wonder how much is allow able, inside for temp junction up to 175 deg. But 95 deg seem to high for its lifetime. So maximum allowable temp I must design?
  13. N

    How to measure eye diagram

    I want to measure eye diagram of Clock, address, data of DDR3. Do you know some how to measure?
  14. N

    How to measure accurancy eff of this circuit?

    I have a bridgre rectifier curcuit able run at 25A. The input is AC 30V, the measure output power is easy P=Vdc*Idc. But input measure by VAc*Iac rms at low current make eff > 100%. Is the problem of power factor?
  15. N

    Customize embedded Linux software for your customized board

    Customize embedded linux software for your cusromize board I am hardware designer new to learn linux software. Now my custom linux board can not boot up, when i see in the u-boot folder there's a lot of files might it including library, linked files. But I dont know which file is need for my...
  16. N

    [Moved]: reference circuit design book analog

    normally I google look for the circuir solution, but sometime not efficient. Any good reference circuit topology, reference book advise?
  17. N

    Look for analog & digital fet driver

    I'm using IR2104 for fet driver in motor controller, but with that FET I want to use it as constant current sink. Is it another way or I'm looking for the hybrid Fet driver both analog and digital.
  18. N

    How to protect microcontroller from damage

    My atmel controller on the same board with buck-boost converter, with output current is 20A, voltage up to 20V. Some how microcontroller damage currently I don't the reason. Do you know to test to see how can damage my microcontroller and verify the design? which tool?
  19. N

    Practical battery emulator circuit

    Hello, I'm looking for practical battery circuit that emulate the function of the battery. Thanks for you advise.
  20. N

    Choose Vds max for buck-boost converter

    I'm designing buck boost converter with Vin max spec is 50V. Which minimum VDS max i should choose? 1.5x or 2x or 3x or just 60V is enought. Please advise what is the best value.

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