Discussion in 'General Technical Questions and Answers' started by KL7AJ, Oct 6, 2019.
actually multiples dont fall out!!
oops some do,some dont...
According to the above, one use is for supression of 60 Hz noise in dual-slope ADC's.
I have some 100 "& a bit" xtals, which were all part of a sideband filter from a commercial ISB transmitter.
They are in an octal tube package.
Unfortunately, the one xtal that was "spot on" 100KHz has vanished.
Years ago, I made up a solid state marker oscillator built scross the pins of an octal socket with that one in it-- the socket & osc has vanished, too!
Needless to say, the aliens wanted it back.
It's from an MFJ 100Kc calibrator. They didn't last very long on the market though.
I guess he's phoning home. I wish they'd come get him.
Well, I have my 120 kc oscillator oscillating. I used a grounded base 2n2222 configuration which provides both low source and low load impedance, which makes sure the rock oscillates in the series resonant mode. I don't have a clue what to do with this thing, but the crystal is now happy, and fulfilling its destiny, I suppose.
Just after I got finished, I ran across this circuit. I do have another 100kc rock I can use to build this. And a bunch of lonely CMOS chips.
The CD 4017 is 53 cents from Digikey. I have a few of these lying around, but I should order up a stash...these are really handy chips.
By the way, I do have a vast collection of FT-243s, many of which are outside the ham bands...but can be re-ground. Let me know if you need one...or two....or twenty.