A PLL will do it provided that the frequency isn't going to change too much.
for 500Hz x 100 = 50KHz a CD4046 will be OK. They're pretty easy to use.
Run the VCO at your output frequency (50KHz) and follow it with a divide by
100 (i.e. two decimal counters?) prior to the phase detector. The other
input of the phase detector is the signal you're trying to multiply. If it's
less than rail-rail use a coupling cap to DC shift - or an amplifier etc.
The output from the phase comparitor is filtered & used to control the VCO.
There are 2 phase comparitors available, I've had more success with the XOR
one but the digital one may be more appropriate in this app.(It doesn't need
a square wave input but it can lock onto harmonics more easily if I remember
correctly).

The filter is the tricky part as it determines the hold-in, pull-in ranges,
noise performance and phase error etc. Look up the app notes, try a few
values & work from there. As much as you can - keep it simple.

My earlier suggestion re the quadrate generation pre-supposed that you were
in a position to generate the original signal.
Richard

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> -----Original Message-----
> From: erik [mailto:erik@NETWURX.NET]
> Sent: Friday, May 21, 1999 2:33 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [OT] Phase delay of square wave
>
>
> I'd be looking at an original clock pulse only as fast as
> 500Hz and I'd
> like to
> multiply it by, say, 100.
> I've seen clock multipliers, but they state a minimum input
> frequency of
> 5MHz. A little too
> fast for my application.  Maybe there are others but I
> haven't been able
> to find them.
>
> Could you direct me to some references or how-tos on building my own
> clock multiplier?
>
> Thanks,
> Erik