Oscillator Circuit for purchase

Thread Starter

ChipCircuit

Joined May 1, 2023
66
Are there any oscillator board having the provision for giving the crystal input of the range of 35khz available for purchase?
 

Papabravo

Joined Feb 24, 2006
21,018
Are there any oscillator board having the provision for giving the crystal input of the range of 35khz available for purchase?
Not likely since 35 kHz. appears to be an unusual value. Cutting a custom crystal for this frequency will be expensive. You will have better luck with a higher frequency oscillator and a frequency divider. You also might have better luck if you work with a programmable PLL (Phase Locked Loop).
 

Thread Starter

ChipCircuit

Joined May 1, 2023
66
Not likely since 35 kHz. appears to be an unusual value. Cutting a custom crystal for this frequency will be expensive. You will have better luck with a higher frequency oscillator and a frequency divider. You also might have better luck if you work with a programmable PLL (Phase Locked Loop).
If we have the crystal unit for that frequency, are there any board available for giving my hand crystal input to that board?
 

Papabravo

Joined Feb 24, 2006
21,018
If we have the crystal unit for that frequency, are there any board available for giving my hand crystal input to that board?
It may be possible to find a board that uses a watch crystal with a frequency of 32.768 kHz and take that crystal out and put yours in. If they are the same type of cut, then you might succeed. If not, then you'll need to try something else.
 

AnalogKid

Joined Aug 1, 2013
10,944
Crystals with frequencies of 34 kHz and 36 kHz are available through Digi-Key. They show a 70 kHz crystal, but no stock.

They do have a 70 kHz complete oscillator IC in a surface-mount package:
https://www.digikey.com/en/products/detail/sitime/SIT1569AC-J3-33E-0070-000000/15976415?s=N4IgjCBcoExgrABiqAxlAZgQwDYGcBTAGhAHsoBtEAdkQAIBrACQC8QBdEgBwBcoQAqgDsAljwDyGALIEseAK4AnAiAC+6oA

If you can find an oscillator IC with the right frequency, here is a mounting board for it:
https://www.ebay.com/itm/333292481096?hash=item4d99c7aa48:g:-CsAAOSwrqdg36g4&amdata=enc:AQAIAAAA0H3hbZDtPDEAbQBky4ewHjHdcqvXifgNvtzZTJnoIt1PfA/xdnlYSvEOG6WEbZAGIHN2hlnSyQ03HgBbKJWcSe4fI5MUMB6b4d7xY94RhYvyY/dv5DS8jYde2+cZC9VLpdfT7/B3GiLXQC6OwV46VUGpJOeSh+A4GK/0eMGu64FoogXS9W31UGxLqfMWjKGYWer/uFIaZ6p1jq2apEvgOJu+ejzdk6OSxrQHglRRf8355ruMFPI912tmS6wTcA33REXTWQX1bDW3HhoQCxjgHqE=|tkp:Bk9SR8yTxuL9YQ

Your question is difficult to answer because you have given us very little information.
What are you trying to do?
Do you need a sine wave output, or is square wave good enough?
What frequency accuracy / precision / tolerance do you need?
How many pieces do you need?

Several companies make programmable silicon oscillators that might be good enough, depending on you actual requirements.

ak
 
Last edited:

DickCappels

Joined Aug 21, 2008
10,123
You asked for a PCB, and I don't know of one for that purpose, but I will point out that making your own is not much of a trick. You use the same values for a low power 35 kHz crystal as you would with a 32.768 KHz crystal.

1683372734476.png

If you change the crystal on the board below to 35 kHz it will probably work. Alternatively, you can probably get them to make a custom version for you.
1683374053146.png
https://www.ebay.com/itm/1435945747...fhZ2UEBC2NuLG8SW6+x/F/7Q==|tkp:Bk9SR8LYwI3-YQ
 

Thread Starter

ChipCircuit

Joined May 1, 2023
66
Crystals with frequencies of 34 kHz and 36 kHz are available through Digi-Key. They show a 70 kHz crystal, but no stock.

They do have a 70 kHz complete oscillator IC in a surface-mount package:
https://www.digikey.com/en/products/detail/sitime/SIT1569AC-J3-33E-0070-000000/15976415?s=N4IgjCBcoExgrABiqAxlAZgQwDYGcBTAGhAHsoBtEAdkQAIBrACQC8QBdEgBwBcoQAqgDsAljwDyGALIEseAK4AnAiAC+6oA

If you can find an oscillator IC with the right frequency, here is a mounting board for it:
https://www.ebay.com/itm/333292481096?hash=item4d99c7aa48:g:-CsAAOSwrqdg36g4&amdata=enc:AQAIAAAA0H3hbZDtPDEAbQBky4ewHjHdcqvXifgNvtzZTJnoIt1PfA/xdnlYSvEOG6WEbZAGIHN2hlnSyQ03HgBbKJWcSe4fI5MUMB6b4d7xY94RhYvyY/dv5DS8jYde2+cZC9VLpdfT7/B3GiLXQC6OwV46VUGpJOeSh+A4GK/0eMGu64FoogXS9W31UGxLqfMWjKGYWer/uFIaZ6p1jq2apEvgOJu+ejzdk6OSxrQHglRRf8355ruMFPI912tmS6wTcA33REXTWQX1bDW3HhoQCxjgHqE=|tkp:Bk9SR8yTxuL9YQ

Your question is difficult to answer because you have given us very little information.
What are you trying to do?
Do you need a sine wave output, or is square wave good enough?
What frequency accuracy / precision / tolerance do you need?
How many pieces do you need?

Several companies make programmable silicon oscillators that might be good enough, depending on you actual requirements.

ak
Square wave output with high precision and accuracy.
 

AnalogKid

Joined Aug 1, 2013
10,944
Square wave output with high precision and accuracy.
A "crystal" for that frequency is a tuning fork, not a real crystal. These have limited accuracy and poor temperature effects. For any real precision (is the spec a secret?), you will have to start with a higher frequency crystal osc and divide it down.

The 70 kHz component in the link is a tuning fork oscillator with a temperature correction circuit built-in. This is as good as a normal-grade true crystal oscillator plus divider, but the package is inconvenient.

ak
 

Ya’akov

Joined Jan 27, 2019
8,976
If you need “high” accuracy and precision you will have to include a crystal oven to eliminate drift and maintain calibration.

Of course that is only going by what I would mean by “high”, I have no idea what you mean by it.
 

DickCappels

Joined Aug 21, 2008
10,123
In an ongoing project I am using an AD9833 to make signals in the 50 kHz range. As I have it set up now, it can generate from 1 Hz to 65,536 Hz in 1 Hz steps. It has noticeable jitter but on average it seems pretty accurate. No need for a custom crystal because is synthesizes the desired frequencies from a 24 MHz crystal.
 
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