12.288 Mhz crystals

Discussion in 'Marketplace' started by takao21203, Mar 4, 2013.

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  1. takao21203

    Thread Starter Distinguished Member

    Apr 28, 2012
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    Many of these here, for SMD mount, nearly 900pcs.

    Today I have tried to calculate if they can be used to derive a seconds time base.

    Using a divisor of 4096, I get 750 oscillations/second.

    (PIC microcontroller, 8bit timer, 1:16 prescaler)

    Definitively easier than deriving a timebase from a 8 MHz crystal.

    What is the originally intended use for 12.288 MHz crystals?

    I would like to sell off a few, 20pcs, or 50pcs each.

    Also many 8 MHz crystals here, SMD case, but having short leads.

    Never sold anything through the fleamarket here but who knows. There are some components which don't sell through my eBay, and otherwise, they sit here in boxes and gather dust.

    Others already were sold off through eBay.

    Nobody seems to want z80 SIO chips. They would be nice for students too to use them with a PIC as serial port.

    Downloaded a 56 page book today only about this IC. 100mA! Very large current. SIO = serial I/O.

    Today I started to make a breakout board for 68ec020. These are still on PCBs, have to take them off, however not good to sell in dissoldered form. I'd have to put them on a fresh PCB immediately.

    Only have taken off one 68ec020, looked at it today. I can solder that to a new PCB, but could not charge a good price for it.

    It is a MQFP100 IC.

    The 68ec020 also can be used with only 8bit wide RAM.

    What should I charge for 68ec020 breakout board?
     
  2. takao21203

    Thread Starter Distinguished Member

    Apr 28, 2012
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    Actually I had them around here for years, but was unaware they can be used for timebase purpose.

    A good solution for my needs.

    Today I have baked off two 68EC020 ICs. Was quite easy, wrapping my hands with a tshirt, and equipped with two screwdrivers. No bent pins.
     
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