Steve,
Just taken a look inside my Corsair II. The Speed Pot on the front panel
measures 8 KOhm across the ends.
At 12 wpm it measures 1 KOhm from slider to right hand pot terminal (seen from
above)
At 30 wpm it measures 6 KOhm from slider to right hand pot terminal
>From that you might be able to work out some series / parallel resistor values
>around the pot to make it less sensitive.
For interest I also checked the frequency of the CW clock oscillator feeding
the processor (pin 15 of the Audio processor board): 12 wpm = 16.6 KHz and 30
wpm = 23.8 KHz. So you could play around with resistors to give that range of
clock speeds. No idea why the clock frequency doesn't scale linearly to wpm,
but I checked it several times and those figures are right. It may be because
the clock is not 1:1 mark/space and the processor may only be looking at one
half of the waveform?
73,
Steve G3TXQ
>Another thing is the silly keyer speed control pot's usable range is
>crammed into about 15 degrees? What's up with that? Plus the manual
>does not include the keyer schematic. Although it's referenced in the
>block diagram as the "logic board" no. 81246. Someone have the
>schmatic for this?
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