Where to buy 500khz oscillator?

Discussion in 'The Projects Forum' started by Gadersd, Apr 14, 2014.

  1. Gadersd

    Thread Starter Member

    Dec 8, 2012
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    I am in need of a non surface mount 500khz square wave oscillator. I have searched my usual electronic supply websites, but have been unable to find it. A 555 timer is not suitable for my project.
     
  2. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Buy a 1MHZ oscillator and connect to a flip flop. It will be perfectly square and exactly 500 k Hz.
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,123
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    Ditto. I have some 1MHz crystal oscillators and a simple ÷2 would give 500kHz.
     
  4. takao21203

    Distinguished Member

    Apr 28, 2012
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    PIC 16F1503 + SMD adapter. So it has PDIP connections.

    It can be programmed with a few lines assembler to output 500 KHz all the time + do nothing by itself. With a crystal or without...

    Or some smaller PDIP8 PIC will even do.
     
  5. Wendy

    Moderator

    Mar 24, 2008
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    Just curious, why will a 555 or a CMOS 555 not work, frequency stability?
     
  6. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    I would use a CD4060 14 stage ripple counter, with a 8Mhz crystal clock, take the output from the first divider pin 7 @500Khz.


    or a 16Mhz crystal and use pin 5 @500khz.
     
    Last edited: Apr 16, 2014
  7. Gadersd

    Thread Starter Member

    Dec 8, 2012
    98
    1
    I recently tested a 1mhz oscillator connected to a jk flip flop. The circuit worked correctly with a push button, but when I connected the oscillator it would always output 0v. What could I be doing wrong? I checked the connections and they seemed alright.
     
  8. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Post your circuit. Photo of Actual circuit and a hand/computer draw schematic.
     
  9. Gadersd

    Thread Starter Member

    Dec 8, 2012
    98
    1
  10. SgtWookie

    Expert

    Jul 17, 2007
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    You didn't label what your J-K flip-flop is. Is it a 4000 series, or a 74 series? We need the exact part number.
     
  11. Gadersd

    Thread Starter Member

    Dec 8, 2012
    98
    1
    It is a CD4027BC. I have been noticing unusual behavior with it. It will toggle with a push button, but it outputs a constant voltage of 0 for about 7 seconds at startup.
     
  12. Gadersd

    Thread Starter Member

    Dec 8, 2012
    98
    1
    I solved the issue. I moved the circuit to the opposite side of my breadboard and it worked properly. Either my breadboard has faulty connections or I wired it incorrectly the first time.
     
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