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What would it take to make this? — Parallax Forums

What would it take to make this?

NWCCTVNWCCTV Posts: 3,629
edited 2012-08-07 23:01 in General Discussion
http://www.amazon.com/Logisys-PD-10-10-CHANNEL-12VDC-DISTRIBUTION/dp/B004X7UBSM

I am pretty sure I have everything needed to make this with the exception of a schematic and the capacitor/regulator/resistor values. Any help out there?

Comments

  • WBA ConsultingWBA Consulting Posts: 2,935
    edited 2012-08-07 23:01
    It wouldn't take much at all to make one of these.
    1. All of the "negatives" are tied together straight from the input to the outputs. (if using the 24VAC input, that side is not "negative", but since you have options for both AC and DC inputs, one side has to be called negative.)
    2. The "yellow chiclets" are actually PTC self resetting polyswitch fuses. One side is tied to the positive side of the input circuit and the other side is tied to the terminal block for the individual output. Here is one that trips at 900mA and might work for lower current protection for development boards. However, one thing to keep in mind with these is the "time to trip". This one has a time to trip of 24 seconds and can pass up to 5.5A in those 24 seconds. I would check out the selection guides on TE's website for picking the right Trip rating for you setup.
    3. The resistors are just to limit current for the LEDs so choose a value accordingly depending on your input voltage range. The resistor and LED are tied between the "plus" output of the resettable fuse and ground. (obviously if you are using the 24VAC input, the resistor and LED is acting as a half wave rectifier so it still works)
    4. The terminal blocks are standard and you can find those just about anywhere.

    on a side note, since I build PCBAs for a living according to IPC-D-610 standards, some of the defective solderjoints caught my eye. The hole fill on multiple joints on the board in that marketing shot are not up to par.
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