Oscillator question

It makes the simple point that an odd number of inverters will always oscillate, something that the OP might find useful.

-- Bill Sloman, Nijmegen

Yes, I did find that useful. Thank you very much.

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So we get an extra 2.5 volts on the input using a 5 volt supply when the thing switches (7.5). Sounds about right. And if we use large capacitors (>100pF), a resistor is recommended. I hadn't considered the RC time delay of adding a resistor. Jim Thompson has an interesting circuit using 3 inverters and a couple extra resistors to avoid the diode problem. More parts, better performance.

-Bill

Yes, so instead of the diodes messing up the time constant, or the current limiting resistor adding propagation delay, you simply drive it with half the amplitude. Works great. Caveat: Thevenin resistance has to be considered, hence the big ratio of resistances. This is inefficient for battery use.

I don't get the third inverter. You can get a fine source of negative feedback from the first. The feedback is even stable if you use HCU (necessary for quartz oscillators). Fanout or risetime is fine from HC, which is buffered, but HCU could stand some sharpening.

I suppose if one were very serious about low power usage, you'd hack your own inverter out of two discrete FETs, which *don't* have protection diodes.

Tim

He would piss the pair of his wife's panties he's wearing if he ever met a real redneck face to face. If he lived long enough. He would be safer bobbing for apples in a garbage disposal.

My copy is Technical Series CMS-271 6/72

Correct. I don't trust Jim as far as I could kick him (and granting his girth, that wouldn't be far).

Sorting out and tolerancing exponential decays is a trivial exercise, but Jim is bound to have some kind of gotcha up his sleeve.

-- Bill Sloman, Nijmegen

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Michael Terrell's fertile imagination remains in robust good health - unlike the rest of him.

The nearest I got to encountering red-necks was when I was playing field hockey around Cambridge. We got to play some decidedly agricultural hockey teams, and my experience at coping with excessively physical hockey players (built up in Melbourne, when I played for the lower level university teams) stood me in good stead. I don't think that any of the opposing players suffered from involuntary release of urine, but they certainly experienced some unexpected discomforts, which my team found amusing.

-- Bill Sloman, Nijmegen

See! I told you Slowman wouldn't know the true meaning of Red Neck. ...Jim Thompson

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Bizarre idea. Bruises on knees and ankles mostly - a filed-hockey player who is trying to hurt you gets close enough (in a predictable way) that you can "accidentally" adjust your back-swing to take advantage of their proximity, or - equally "accidentally" - end up standing on their feet.

What sort of sport did you play that exposed the male external genitialia to passing teeth? Water-polo is that only one that comes to mind - and that from occasional anecdotes rather than any kind of involvement or ever watching the game.

-- Bill Sloman, Nijmegen

Wrong. But, to be expected I suppose, when you rely solely on Wiki for information.

Ed

What a poorly written article.

The origin _is_ coal mine strike breakers (Bluefield)... who all wore red bandanas, to identify who to "whack" and who to not :-)

Sounds like the article was written by someone at NPR, who keeps their job due to political correctness ;-) ...Jim Thompson

Well, I know what a redneck school is, that has drivers ED!

On Monday, Wednesday and friday is drivers ED, only because on Tuesday and Thursday, the car is needed for the Sex education classes.

Have a good day..

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John Fields trying - and failing - to be clever.

-- Bill Sloman, Nijmegen

And the particulars were covered in a relatively recent episode on The History Channel...

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Not taking John Fields seriously doesn't take clever.

-- Bill Sloman, Nijmegen

What do you expect from someone who's 'Dead from the neck, up'?