# Frequency of Crystal oscillator

A

#### Animesh Maurya

Jan 1, 1970
0
Hi everybody,

I have two crystal oscillators marked as 4.0 AKSS8KT and 15975 KSS8CT.

frequency.

For a given value of capacitance, physical size of a capacitor depends
on maximum voltage rating, so which factor determines the size of a
crystal.

How do ceramic resonator(having 3 legs) differs from crystal
oscillator?

Thanks

Best regards,
Animesh Maurya

T

#### Tim Wescott

Jan 1, 1970
0
Animesh said:
Hi everybody,

I have two crystal oscillators marked as 4.0 AKSS8KT and 15975 KSS8CT.

frequency.

That 4.0 is strongly suggestive of 4MHz, and I wouldn't be surprised
that the other one is 1.5975MHz. If they're oscillators why not hook
them up and see?
For a given value of capacitance, physical size of a capacitor depends
on maximum voltage rating, so which factor determines the size of a
crystal.

If it's an AT cut a quartz crystal's frequency depends primarily on it's
thickness between the electrodes, and (I think) a bit on the mass of
the electroplating.
How do ceramic resonator(having 3 legs) differs from crystal
oscillator?

Some 3-leg ceramic resonators are designed to go into an oscillator
without needing capacitors, the 3rd leg (usually the middle one) goes to
ground.

Make sure it's not a ceramic _filter_, which is used for filtering in a

A

#### Animesh Maurya

Jan 1, 1970
0
Tim Wescott said:
That 4.0 is strongly suggestive of 4MHz, and I wouldn't be surprised
that the other one is 1.5975MHz. If they're oscillators why not hook
them up and see?

If it's an AT cut a quartz crystal's frequency depends primarily on it's
thickness between the electrodes, and (I think) a bit on the mass of
the electroplating.

Some 3-leg ceramic resonators are designed to go into an oscillator
without needing capacitors, the 3rd leg (usually the middle one) goes to
ground.

Make sure it's not a ceramic _filter_, which is used for filtering in a

Tim, thanks for the info. How did you read it, please explain me.

I can see 4 & 15975, but where are the multipliers? Are KT and CT
doing it?

Size of the 4Mhz is much smaller compared to 1.5975Mhz one, does it
means higher the frequency, smaller the size.

Where can I hook them up to measure there frequencies? I don't know
one.

Thanks again

Best regards,
Animesh Maurya

T

#### Tim Wescott

Jan 1, 1970
0
Animesh said:
Tim, thanks for the info. How did you read it, please explain me.

I can see 4 & 15975, but where are the multipliers? Are KT and CT
doing it?

Size of the 4Mhz is much smaller compared to 1.5975Mhz one, does it
means higher the frequency, smaller the size.

Where can I hook them up to measure there frequencies? I don't know
one.

Thanks again

Best regards,
Animesh Maurya

Crystals (and oscillators) are commonly available from 1 to 100MHz. The
multiplier was a guess (come to think of it that may be 15.975MHz). The
codes are just manufacturers codes, unless you know who made them they
don't make much sense.

Are they crystals, and not crystal oscillators? If they're oscillators
they'll have four terminals. Look in the Digi-Key catalog
(www.digi-key.com) for hookup. Digi-key will have pictures of crystals
and oscillators that you can use to figure out what you have, and may
even carry the same brand, in which case you can study manufacturer's
part numbers and figure out what you have.

If they're _crystals_ then you will have to build an _oscillator_, put
them in and see what frequency it runs at. Get yourself a good basic
electronics book with a crystal oscillator circuit, or google on
"crystal oscillator", or ask on electronics.basic or electronics.design
to see if someone has a link to a circuit on the web.

A

#### Animesh Maurya

Jan 1, 1970
0
Tim Wescott said:
Crystals (and oscillators) are commonly available from 1 to 100MHz. The
multiplier was a guess (come to think of it that may be 15.975MHz). The
codes are just manufacturers codes, unless you know who made them they
don't make much sense.

Are they crystals, and not crystal oscillators? If they're oscillators
they'll have four terminals. Look in the Digi-Key catalog
(www.digi-key.com) for hookup. Digi-key will have pictures of crystals
and oscillators that you can use to figure out what you have, and may
even carry the same brand, in which case you can study manufacturer's
part numbers and figure out what you have.

If they're _crystals_ then you will have to build an _oscillator_, put
them in and see what frequency it runs at. Get yourself a good basic
electronics book with a crystal oscillator circuit, or google on
"crystal oscillator", or ask on electronics.basic or electronics.design
to see if someone has a link to a circuit on the web.

Thanks, you kicked out my vague thinking that crystals can also be
read like color coded resistors, until unless you know the
manufacturer.
I will try to catch out the manufacturer.

Best regards,
Animesh Maurya

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