no breadboard here- testbench for YX8018

Discussion in 'General Electronics Chat' started by takao21203, Apr 11, 2015.

  1. takao21203

    Thread Starter Distinguished Member

    Apr 28, 2012
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    not sure whats more interesting to discuss.

    I want to release a parts kit for the YX8018 IC, need to test the inductors and LEDs.

    As well I have a voltmeter on board, and can switch LED mode.
    17 switches now
    The problem with breadboard is the cost if you want to use a large one, and keep it for a couple of months or so.

    Cardboard costs nothing!
    I use regular office supplies such as large paper clips (steel wire), and pins, as well small 5x7 proto boards.
    The standoffs are made from empty IC bars (never tought I could find a use for them).

    So, all the parts cost me...maybe $4 or so.

    Why plug wires back and forth when you can use switches? I can turn on/off any of the inductors and LEDs.
    Turn on the voltmeter, and change LED mode, as well use 1 or 2 batteries.
     
  2. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    If it works, it works!:D -- though lead length/parasitic reactance issues will be exacerbated at RF (including signals having RF constituents -- e.g. digital and other non-sinusoidal signals)...

    But then I'm bound to ask why? --- While breadboards, inarguably, cost more than cardboard, they would certainly seem more than worth their expense! --- Am I missing something?:confused:

    Best regards
    HP
     
  3. takao21203

    Thread Starter Distinguished Member

    Apr 28, 2012
    3,577
    463
    i have breadboards here but dont even want to think about them.
    Dont havve the right wire + the circuits fall apart after a while and its hard to find out which connection is loose.

    yes i will maybe get effects from long wire at 200 khz

    but its a few nH ??

    I wonder how that counts if I deal with 47uH or so, what matter does it make even have 1uH extra from wires?
    EMI?
     
  4. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    The effects will, indeed, be negligible at 200KHz -- Be advised, however, that, if your application entails non-sinusoidal waveforms, attenuation of harmonic content will distort the signal --- A square wave, for instance, requires 'passage' of at least five (odd) harmonics is any semblance of transition time fidelity to be preserved (implying a bandwidth of at least 2.2MHz) e.g. assuming an added inductance of, say, 2nH, the fundamental will 'see' an XL~2.5 mOhms while the fifth odd harmonic (@2.2 MHz) will see XL~28 mOhms -- The significance if which will depend upon other circuit constants... Note also that this discussion doesn't even touch upon the subject of improper termination (Spec. complications corollary to reflection, ringing, radiation losses, undesired transformation, ETC...)

    But again, if it works, it works!:cool: --- I confess to ignorance of the YX8018 and, hence, the specifics of your application:oops:

    Best regards
    HP
     
    Last edited: Apr 12, 2015
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