At 08:37 PM 8/21/01 +0200, you wrote:
>A friend of mine asked if I couldent help him convert a 0-50 Hz squarewave
signal
>to 0-400 Hz. The application is to adapt his RPM display 0-400 hz to 0-50 Hz.
>The solution doesnt haveto be 100% exact.
>
>I am not sure howto do this. The only idea I have so far is to use a PIC
and measure
>the 0-50 Hz signal then multiply the result by 8 and output the result
somehow as
>a squarewave signal...
>

- Could the timebase of the RPM display be modified by 8:1 ?

- Is the range of speeds and rate of change relatively narrow and slow
respectively
  (use a PLL with an 8:1 divider in the feedback, eg. 4046, 4040).

- create some pulses on each edge of the income waveform (4 on each, say).
I think
  this could be done with a couple of CMOS gate packages (quad XOR and ST
inverter) and
  4 resistors + 4 capacitors.

Best regards,
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Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
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