[time-nuts] uC ADC resolution (was: Poor man's oven)
zl1tao at gmx.com
Wed Jun 7 19:10:20 EDT 2017
For under $20 you can get a OCXO with Si5351A multi output oscillator
chip from QRP-Labs.
No idea just how good it is but this link gives insight into how it was
developed. Designed for WSPR radio transmissions. GPS discipline can
On 06/08/2017 06:10 AM, Chris Albertson wrote:
> IT turrets out that you see MUCH more interesting designs when you lower
> the budget. Anyone can make a high performance system even enough money.
> They waste half the cost on useless stuff and the product costs double what
> it should and is over complex but is works real, really well. That's
> easy. Harder and more interesting is "Can you make something just as good
> at 1/2 the price?" Answer is usually Yes. Then you say "what much do you
> loose if I set the price to 1/4? The answer is surprisingly little if you
> get smart about sourcing parts. Turns out about $180 is the minimum
> for pretty decent quality HiFi vacuum tube.
> An interesting graph would be Oven Specification vs. Price. What is the
> minimum cost for keeping temperature to within 1.0 C, for 0.1C, 0.01 C?
> Can you do 1.0C for under $5? or 0.1C for under $10. I bet yes.
> I did an exercise a while back to see what is the minimum price and
> complexity to build a GPSDO that was good enough only to drive the lab
> bench instruments I have. I implements only 1/2 od Lars W's design and
> cut his lines of code by about 90%. Turns outhe cost is the XO and about
> $10. Compared to my Thunderbolt, performance was not nearly as good but
> the ratio of performance over parts cost might be better.
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