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I wanted to use a 555 timer in astable mode to generate a 5V signal to flash an LED on and off. This works fine when the pulse length of the LED is in seconds or milliseconds. But this got me thinking about pulse generators more generally. Disregarding the LED for a moment, I would like to generate a much faster signal with width 300ns. I do not believe that the 555 timers are fast enough to do this. Does anyone have any suggestions on possible high speed timers? Thank you.

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    \$\begingroup\$ Even though you use the word "timer" what you seem to need is just an oscillator which can produce high frequencies. Search for the keyword oscillator or crystal oscillator or frequency multipliers. \$\endgroup\$
    – AJN
    Jun 15, 2021 at 16:15
  • \$\begingroup\$ Thank you! This is exactly what I was looking for! \$\endgroup\$
    – ClassicBeavs
    Jun 16, 2021 at 8:09

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As per the advice of @AJN, the answer to this problem is using a high frequency oscillator. A crystal oscillator looks perfect.

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