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PICList Thread
'ceramic resonators...'
1998\05\28@190240 by William Chops Westfield

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My turn for what should be a simple question...

Are "ceramic filters" the same as "ceramic resonators" ?  I can go into the
local surplus store and find little three-lead devices labled "ceramic filters"
in all sorts of nice frequencies (ie 6MHz.), as well as "ceramic resonators"
in a more limitted range (3.58MHz)  Will both of these work in the oscillator
circuit of a PIC?

Thanks
bill W

1998\05\28@191727 by David VanHorn

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>Are "ceramic filters" the same as "ceramic resonators" ?  I can go into the
>local surplus store and find little three-lead devices labled "ceramic
filters"
>in all sorts of nice frequencies (ie 6MHz.), as well as "ceramic
resonators"
>in a more limitted range (3.58MHz)  Will both of these work in the
oscillator
>circuit of a PIC?
>
>Thanks
>bill W


The resonators will, but the filters have wider bandpass that could get into
some
real wierd operation. You could get them to oscillate in a series mode
circuit, and
they would run at some freq within their bandwidth (not necesarily the
center!) but
I'd be nervous that they might shift freqs with temp change.

The filters are designed to pass a range of freqs, where a xtal is designed
to pass
(or be high impedance at) one frequency.

1998\05\29@025339 by Bill Cornutt

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Crystal filters and maybe ceramic filters are used in radio stuff
to pass only the desired frequence after mixing two signals.

Bill C.  spam_OUTbillTakeThisOuTspamcornutt.com


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{Quote hidden}

1998\05\29@071714 by Leon Heller

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In message <.....CMM.0.90.4.896396420.billwKILLspamspam@spam@flipper.cisco.com>, William Chops
Westfield <billwspamKILLspamCISCO.COM> writes
>My turn for what should be a simple question...
>
>Are "ceramic filters" the same as "ceramic resonators" ?  I can go into the
>local surplus store and find little three-lead devices labled "ceramic filters"
>in all sorts of nice frequencies (ie 6MHz.), as well as "ceramic resonators"
>in a more limitted range (3.58MHz)  Will both of these work in the oscillator
>circuit of a PIC?

These filters are designed to be used as frequency-selective devices in
radio receivers, rather than as simple resonators. They are unlikely to
work properly in an oscillator circuit, as they actually consist of two
resonators coupled together. Although they have three legs, they don't
incorporate the capacitors necessary for oscillator operation. If you
clip off one of the outer pins, it'll probably work as a simple
resonator. I'd be inclined to try it and see what happens. 8-)

Leon
--
Leon Heller: .....leonKILLspamspam.....lfheller.demon.co.uk http://www.lfheller.demon.co.uk
Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
See http://www.lfheller.demon.co.uk/dds.htm for details of my AD9850
DDS system. See " "/diy_dsp.htm for a simple DIY DSP ADSP-2104 system.

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