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Recent content by bianchi77

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    Flat cam and altium *.drl configuration ?

    Dear Members, What's *.drl configuration from Altium for FlatCam ? I got this display from Flatcam : Any ideas ? Thanks
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    AdvSch.dll error on Altium ? how to resolve it ?

    Hi, I got error AdvSch.dll error in altium, how to resolve it ? thanks
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    L1 and C1 value for EMI filter design ?

    if it's 470nF what's the formula for L1 ? application parameters ? do you mean input voltage and frequency? 220V 50Hz - - - Updated - - - Device power up to 20W
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    L1 and C1 value for EMI filter design ?

    What's the formula ? I'm thinking 4.7uF VAC 250VAC X2 for C1, and L1 = ? thanks
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    L1 and C1 value for EMI filter design ?

    Dear Members, What's the value for C1 and L1 for EMI filter, if I use 220V 50Hz ? Please see the schematic attached, Thanks
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    Calculate PPM alcohol with MQ-3 sensor ?

    Dear Members, Does anyone know on how to calculate PPM alcohol with MQ-3 sensor ? Thanks
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    Sim808 and 3G network?

    Dear Members, Can I use sim808 with 3G network in Australia? Thanks
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    Sim900 SIM Card question ?

    I used STM32 and arduino uno SIM900 shield, I got this response from UART : SIM900 RTOS TEST BEGIN! SIM 900 INIT SIM80x_INIT! AT...
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    Sim900 SIM Card question ?

    Dear Members, Can I use SIM900 without SIM card for init code ? Does it support 3G ? Thanks
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    Low cost 8 layers PCB service ?

    I saw some, but still expensive, 5 pcs for $400, anything lower ? about $100 ?
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    Low cost 8 layers PCB service ?

    Dear Members, Where can I find low cost 8 layers PCB service ? Thanks
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    TVS for 5V power supply ?

    I can see from datasheet Vclamp is 10V, Good enough I reckon for protecting my board, I combine it with fast blow fuse. It's an experiment, I want to know the response. What TVS do you suggest ? Vishay or ON？ I'm looking for through hole model. 谢谢 你们
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    TVS for 5V power supply ?

    5.25V maximum for the device
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    TVS for 5V power supply ?

    Yes I want to protect the output side... So with breakdown 6.8V, good enough, the breakdown is as close as to 5V ? or opposite way ?
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    TVS for 5V power supply ?

    It's DC power supply, just want to protect the circuit supplied with it, Yes I have put fuse but I want to put extra TVS as protector and experiment. The breakdown of the TVS is 6.8 V or I need higher abit ? I'm looking at P6KE6.8 thru P6KE540A Thanks
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