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oscillator

Discussion in 'Misc Electronics' started by Ken O, Jun 24, 2006.

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  1. Ken O

    Ken O Guest

    Hello,

    The 555 timer has a maximum frequency of 1MHz.
    I would like to know if there is another chip that can go up to in the low
    MHz ( about 20MHz).
    I need a square output waveform. Basically a beefed up 555 :)

    Thanks
    ken
     
  2. Rich Webb

    Rich Webb Guest

  3. Ken O

    Ken O Guest

    No just a square wave.
    Do crytals offer just as good square wave ?

    Ken
     
  4. Ken O

    Ken O Guest

    Not that stable.
    Actually I wanted to swap that with my 555 chip (with minor changes too) and
    the output will go to my base of my 2n3055 transistor.
    At first I was looking the 7555, but that seems to be too much on the border
    line
    I dont really want to go digital too like a vibrator.

    ken
     
  5. Ken O wrote:
    (snip)
    So, are you saying you want to switch a 2N3055 on and off up to 20
    million times a second?
     
  6. Ken O

    Ken O Guest

    well the 2n3055 is only good for 3 MHz, I'll have to chosse another chip
    that does faster. even that , it IS better the 555.

    Ken
     
  7. ws

    ws Guest

    Yes, do back up a few steps here. What solution or effect are you trying
    to rig up here, that needs a high(er)-current 20Mhz square wave?

    Regards,
    ws
     
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