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    [SOLVED]Closed: Re: PDF417 barcode Scanner hardware module

    Well, I got no answer here but i found what i was looking for, so i am sharing it here in case anyone needs the same stuff:
    ...
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    [SOLVED]Closed: PDF417 barcode Scanner hardware module

    Hello,

    I am looking to source some OEM PDF417 barcode reader modules, I have tried looking for it but i only got end products, can anyone help me please?

    invisible infrared ink (around that 950...
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    Closed: Re: Analog circuitry analysis

    Thanks a lot Klaus.

    I am trying to connect this to a MCU, so was thinking of this circuitry:

    151036

    the voltage might spike to 10v out of the sensor so i need to adjust it as i am using a 5v...
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    Closed: Analog circuitry analysis

    Hello fellows,

    I have the attached analog circuitry attached to an ADC, I am trying to understand what each step does, i figured out a couple but i am really struggling to understand the others...
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    [SOLVED]Closed: Re: AC/DC converter explaination

    Well it actually feeds another board with a DC/DC converter to step it down to 12v, the current limiting stuff is there.



    this is one of the things i am trying to do actually. this is from a...
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    [SOLVED]Closed: Re: AC/DC converter explaination

    this is actually designed to supply 12A, it's also used for HiFi sound systems, it has to be extra pure, I am actually using 10000uF (75£ caps, audio grade) to get the best performance.



    It is...
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    [SOLVED]Closed: Re: AC/DC converter explaination

    I really hate reverse engineering, you never know what the designer was thinking... I am afraid if i remove them i'd miss something
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    [SOLVED]Closed: Re: AC/DC converter explaination

    it does not light and i guess Brian was right about it being a voltage reference.



    Sure mate, I actually received this from someone and i don't have the paper now, i just added it to show how i...
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    [SOLVED]Closed: Re: AC/DC converter explaination

    I am truly embarrassed for having all those bad symbols, I was just copying from this and used the first symbol i had from library... was going to fix this once i start layouting, sorry about it.
    ...
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    [SOLVED]Closed: Re: AC/DC converter explaination

    D6 is TL431BQLPR

    the Red LED does not turn on, i will try to flip it in the morning, it's just an indicator let's forget about it anyway.

    I have attached a new screenshot of this circuit, hope...
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    [SOLVED]Closed: Re: AC/DC converter explaination

    I am using OP177 op amp (PN: OP177FPZ), can you explain your claim that the op amp inputs are swapped?
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    [SOLVED]Closed: Re: AC/DC converter explaination

    Hello Andre,

    I am using this as a PC power supply, I assume there is 30.722v (Vfd = 0.9v) at V+ and (R8 + upper R7) and (R9 + lower R7) are the divider, and we have +2.495v on IN+, how do i...
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    [SOLVED]Closed: AC/DC converter explaination

    Hello, I have reverse engineered the attached circuit from an old power supply, i was wondering how the comparator works? can someone help me figure out how they did the calculations? i really want...
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    Closed: Re: Design of a PCIe card with USB and Ethernet

    Hello,

    I actually found a great core for Ethernet from Intel (X550) ((https://www2.mouser.com/datasheet/2/612/ethernet-x550-datasheet-1140612.pdf)) which does exactly what i need it to do... for...
  15. [SOLVED]Closed: Re: What does the transistor do in the attached circuit?

    Hello all,

    I am here to report the readings of the board i made... the circuit i posted did not work, so we simply flipped the PNP and used an NPN transistor for the +ve part... the voltages read...
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    Closed: Design of a PCIe card with USB and Ethernet

    Hello,

    I am currently working on a USB 3.1, 10GigE to PCIe board, i was wondering if a FPGA would do the job? what can be the challenges with it?

    Regards.
  17. [SOLVED]Closed: Re: What does the transistor do in the attached circuit?

    at the first glance thought you were talking about the charge pump, anyway the voltmeter reads as 7.3v

    - - - Updated - - -



    this is what i am convinced to be true, yet there is something not...
  18. [SOLVED]Closed: Re: What does the transistor do in the attached circuit?

    How come it is just -6v while the source is 9v??

    R2 and D7 goes to another part of the circuit.

    - - - Updated - - -

    Hello,

    I confirm that the set up in the attached screen shot is working...
  19. [SOLVED]Closed: Re: What does the transistor do in the attached circuit?

    Hi,

    Thanks for this info, truly appreciated!

    Actually this was a double rail circuit and I added the negative voltage converter to get rid of 1 battery, now regarding the Cap, I will add a...
  20. [SOLVED]Closed: I have this diode that i need to know it's number

    Hello, I have this diode that i need to know it's number or any details about it, check the pic

    149620
  21. [SOLVED]Closed: Re: What does the transistor do in the attached circuit?

    So the main reason for adding them is to increase battery life?
  22. [SOLVED]Closed: What does the transistor do in the attached circuit?

    Hello, I have the following power circuit, i was wondering what the transistors do in this circuit? it is an old circuit that is proved to be working though i am thinking of removing the...
  23. Closed: GSM module options & specifications for video transfer application

    Hi, I am looking for a GSM module for sending and receiving videos... what are the specs that i should be looking for? I basically need it to support 3G/4G communications so 1Mbps is enough, need it...
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    Closed: Re: Looking for Ethernet Switch IC i need help

    Hi, thanks for your comment!

    I have seen this and got the whole datasheet, the thing is that the one i used before had 124 pinns and supported 24 ports this one has 400+ for 12 ports only... made...
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    Closed: Looking for Ethernet Switch IC i need help

    143858

    Hello guys, I am looking for a suitable chip as a switch for my design, any recommendations? i searched digikey and couldn't find any. please help me.

    IC plus IP1725 is an example chip...
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