Electronics > Projects, Designs, and Technical Stuff
Quartz crystal as basic frequency reference
sahko123:
I want to make a very simple frequency reference with a quartz crystal and somewhat obviously don't have the budget to buy pre-built standard references. All i want to know is how to make an oscillator using a crystal and how accurate should i expect it to be.
ArthurDent:
From what you are saying about your knowledge you will be far better off to buy a OCXO than try to build your own oscillator. Making a quality frequency standard from scratch involves a lot of technology an a fair bit of magic. Not knowing what you are using the standard for prevents any good recommendations. Even if you build one you have to have a higher accuracy standard to adjust yours to the correct frequency.
Here is a really simple inexpensive one.
https://arachnoid.com/frequency_standard/
sahko123:
sorry guess i should of specified the use case but the stuff im gonna be referencing it against is only gonna be used down just above the audio rang like 30khz and under and itll be used as a transfer reference to go from one scope to another. And in the end im just looking to make a small oscillator circuit thats stable enough over like a minute
Conrad Hoffman:
Look for a DIP crystal oscillator. Should only cost a few dollars. Typically you just supply power and it will have TTL or similar output.
james_s:
I bought a couple of surplus Trimble double oven precision 10MHz oscillators for $15 each, they are many orders of magnitude more stable than anything you can easily build yourself. If you want just modest stability pull a TTL oscillator out of some scrapped device, or buy one of the $12 DDS boards from eBay.
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