Hi > On Mar 14, 2017, at 4:44 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.
Purchased in volume, the difference it the price of a crystal vs a complete XO is enormous. You will see at least a 10:1 cost savings on the crystal and likely more than that. Simply attaching a crystal to the internal oscillator inside a chip is nearly zero engineering cost. If your product is cost sensitive and not super tight tolerance … you go with the crystal. Bob > > 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.