For interest, and as part of art project involving crystals. I want to show a less third-age usage than is common in that space :).Acceleration effect on frequency may also be featured. No way would I do it for cost or quality.
Like you, I normally use packaged oscillators for most things - though I do still encounter plenty of the passive crystals on cheap microprocessor boards. The oscillators may be $1, but I suspect those crystals are 10c. My first encounters with crystals were probably with the inverter oscillators of early micros. I gather there's a lot more black magic in their design than analysis, and as a result they used to have problems oscillating. The oscillators built into modern micros are a lot better. I'll probably use a more carefully characterised amplifier if i cut my own crystal. On Tue, Mar 14, 2017 at 8:44 AM, Hal Murray <hmur...@megapathdsl.net> wrote: > > artgod...@gmail.com said: > > I'm not after quality - I do have an application in mind but it doesn't > need > > to compete with mass production. Just wondering if it's feasible to make > > something crude that will resonate. > > Are you doing this for fun or ??? > > Feasible? Sure. Cheaper? That depends. > > The cost difference between a complete oscillator package and a simple > crystal is tiny. The osc is often cheaper if you include board space or > engineering time. > > Is your background digital or analog? Do you want a sine wave or a clock? > > My background is primarily digital. If the chip you are using has 2 pins > setup to drive a crystal, you can probably get it to run reliably by > following the data sheet and/or app notes. The usual recipe is 2 tiny caps > and a big resistor. (big in resistance, not physically big) > > An advantage of using a crystal with the on-chip amplifier that I didn't > mention last time is that you save the osc power if you power down that > corner of the chip. > > If you want a sine wave, you are out of my comfort zone. I'd probably look > in ham radio literature. > > They make logic chips like a 74HCU04, U for unbuffered. One of their uses > is > for making oscillators. I've never done it. Try google. > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.