Re: Apple Graphics Tablet

[Michael J. Mahon <mjmahon@aol.com>]

Alex Freed <alex_news@alexfreed.com> wrote:
> On 6/18/2012 11:10 PM, Vladimir Ivanov wrote:
>> 
>> Q3 is more like strobe than clock - both composite and non-50% duty
>> cycle. The creative abuse in Disk II interface won't work for all
>> scenarios.
>> 
> 
> Actually a 50% duty is not often needed for a clock - the circuits like
> flip-flops and counters only care about one edge.
> 
> BTW using a tuned LC circuit for frequency multiplication is not very
> "creative" as it is a standard practice in radio transmitters since the
> dawn of radio. For low integer factors beats the fancy PLLs in terms of
> jitter not to mention the cost.

True. I remember using a trigger-excited LC tank to generate time marker
pulses for an oscilloscope many years ago. This was a common technique in
radar scopes. (And there it's not even being used as a frequency
multiplier.)

-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon