| Electronics > Projects, Designs, and Technical Stuff |
| Just finished a board to play with crystal oscillators |
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| hamster_nz:
I've just sent off a board to play around with crystal oscillators and tuning them, loosely based on Figure 6 of this app-note https://www.analog.com/media/en/technical-documentation/application-notes/an12fa.pdf The cutouts are so I can make a small insulated enclosure for the center section out of EPP or PS foam, and use the 1/4W resistors to heat it up. It has a mishmash of SMD and THP is because I'm using mostly junk-box parts. Anyhow, just thought I'ld share :D - is anybody else out there working on any experiments, just for the heck of it? |
| iMo:
It depends what is your goal.. You will not get something even close to the cheapest tcxo's performance with that design, imho. The performance will be something like the cheapo canned oscillators from old motherboards. 7805 is noisy and not stable enough, you need a special oscillator circuit and crystal to get stability and noise, the LM319 is rather slow, heating with those resistors has no sense unless you control the temperature.. |
| hamster_nz:
--- Quote from: imo on November 01, 2018, 10:05:03 am ---It depends what is your goal.. --- End quote --- It's just for experimenting/learning, rather than watching TV :D The temperature will be monitored & controlled by a small micro, or more likely a spare Raspberry Pi Zero. |
| iMo:
--- Quote from: hamster_nz on November 01, 2018, 10:16:26 am --- --- Quote from: imo on November 01, 2018, 10:05:03 am ---It depends what is your goal.. --- End quote --- It's just for experimenting/learning, rather than watching TV :D The temperature will be monitored & controlled by a small micro, or more likely a spare Raspberry Pi Zero. --- End quote --- You will experiment, then you will spend $25 for a double ovenized ocxo from ebay, and then you will again sit and watch TV :) :) |
| hamster_nz:
--- Quote from: imo on November 01, 2018, 10:20:22 am ---You will experiment, then you will spend $25 for a double ovenized ocxo from ebay, and then you will again sit and watch TV :) :) --- End quote --- Sounds like all of hobby electronics :-) |
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