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Recent content by cmotif

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    POGO pads and protection against ESD events

    Hi all, I have a question regarding ESD protcetion for contact/POGO pads , and the techniques to handle ESD events properly. Setup: I have a 6 layer board that has 4 POGO pads, to transfer power and signals. This board has a FPGA and MCU on it. The board is a 6 layer board, with: 1 VCC...
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    [SOLVED] Need help using LM358N as instrumentation amp

    I have tested it out with the sensor with a split supply for the amp and the gain is correct. Hence the problem is how I hooked up the amp. I am now trying to see if it works just as well with a virtual ground at 6Vdc.
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    [SOLVED] Need help using LM358N as instrumentation amp

    hi do you mean the non inverting output of the final opamp should be tied to 6 volt via the 100k resistor? which is half of the supply. otherwise I do not quite understand what you mean by a specific biasing circuit. - - - Updated - - - hi, thanks for the recommendation. I am trying to use...
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    [SOLVED] Need help using LM358N as instrumentation amp

    I am trying to hook up a pressure sensor to a National Instruments DAQ analog input to read the pressure reading. However as the sensor is unamplified it is too noisy to read. I built an instrumentation amplifier to amplify the circuit with some LM358N that I had lying around. I followed the...
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    [SOLVED] Power metering AC live as DC ground?

    Thanks all for your replies, I now understand the circuit better. :smile: I just checked my AC neutral and yes it is on same potential as protective earth. I was thinking of using an offline switcher like the LNK306PN instead to implement the transformer-less power supply in attempt to cut...
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    [SOLVED] Power metering AC live as DC ground?

    Thanks for the reply! I did not know USB isolator existed. I have another question, I'm quite new to AC circuit design hence bear with me. =) Is there a difference if I used AC neutral for DC ground instead?
  7. C

    [SOLVED] Power metering AC live as DC ground?

    Power metering AC live as DC ground. Hi All, I came across this power metering circuit that does 230VAC to 5VDC conversion. However I do not understand why it uses the AC switched line as DC ground. it powers a microcontroller and a debugger cannot be connected while the circuit is...
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