MIDI interface clock

[(Jimmy)]

>At 06:21 PM 5/7/97 +0200, you wrote:
>>Hi,
>>        I started building a MIDI interface, but am stuck at the moment.
>>I am using a 6402 UART, and have got the input and output stuff done,
>>with an opto-isolator and not gate.
>>The problem seems to be with the clock.
>>The circuit is something like
>>
>>                +---Not----+---Not----- Out
>>                I          I
>>                I-Resistor-I
>>                I          I
>>                I-Xstal----I
>>                I          I
>>              Capacitor  Capacitor
>>                I          I
>>        -------------------------   0v
>>
>>I am using a ceramic resonator instead of a xstal, but I can't seem to get
>>much of an output.
>>Should this circuit work? All the others seem to have the not gates in
>series.
>>Is there a similar circuit I could use using a 4001 quad nor gate, a 500MHz
>>Ceramic resonator, and a few resistors and capacitors.
>
>500MHz (!!!!!) using CMOS ?????  It'll never happen (if that's not a typo).
> A 4001 CMOS gate will not clock that high.  Maybe you mean 500KHz?
>(That's ok).
>
>I have a digital design book from college that reviews a handful of TTL and
>CMOS based clock circuits stating pros and cons.  One of the cons that came
>up in a few designs were "won't self start".  Maybe that's your problem.
>Try a different topology.  You'll need to do some research if you don't
>have other circuits to try.  Or you could always use an integrated digital
>clock chip.
>
>John Speth (johns at oei.com)
>Object Engineering, Inc.
>Vancouver, WA

Thanks for the help John,
Sorry, I meant 500KHz (Slight difference eh!) It seems to be something to
do with the 4001 chip. I am also using the 2 other gates in it, and if I
attach the clock circuit, the rest of the chip doesn't work either!...
Oh well.....
        Maybe I'll use an integrated digital clock chip instead!