[sdiy] X8 squarewave multiplier.

[Harry Bissell Jr]

If you have a sawtooth wave you could run it through
  a number of comparators, and make pulses each time one goes
  high. Combine the pulses and you have frequency multiplication.
  I think that this has been done with an LM3914 bargraph chip.
  
  iirc it was Grant Richter who did it...
  
  The Wiard/Blacet MiniWave uses a similar frequency multiplication
  technique...
  
  H^) harry  (can't say more, or they have to kill me :^)

Dave Kendall <davekendall at ntlworld.com> wrote:  Hi all.

Does any one know of a simple circuit that will produce a square or pulse
wave at 8 times the original input frequency? The idea is to use the
different waveforms from the EFM LFO5A staircase generator through a VC lag
to produce new waveforms. The staircase can produce some quite odd
repetitive waveforms if you tap into different points in the resistor
network on the 74LS93 outputs, but they are at 1/8th the clock frequency. if
using it with a Square wave VCO, the clock would need to be multiplied by 8
to be at the same frequency as the original.

Any ideas anyone?

Dave (just having removed sheep crap from the brake pedal:-)



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