[sdiy] X8 squarewave multiplier.

[Tim Parkhurst]

On 1/17/06, 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:-)
>
>
8X sounds like a pretty tall order. You'll probably have some luck with a
PLL (search the recent archives, I'm pretty sure this topic came up
recently). You might also try using a sawtooth wave instead. Run it through
a 3-bit A/D and use the LSB as the 8X clock. This is a little like the
technique Blacet uses to clock the Mini-Wave (although they use a higher
resolution A/D).


Tim (short order) Servo
--
"Imagination is more important than knowledge." - Albert Einstein
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