Is it a bird?, is it a plane?, no it's an XTAL - Electronic Circuits Projects Diagrams Free

grrr_arrghh · 3rd February 2004, 06:04 PM

Hi

I am trying to 'reverse engineer' a cirucit, and have come across a component that looks like an XTAL, and has the inscription "18.432 SUNNY" (without the quotes). Can anyone tell me if it is an XTAL, and if so, what does it really do?

Also, if anyone has any simple circuits using XTALs, that would help me to understand them a bit better, I would be very greatful.

Also, anyone know anything about these chips (these aren't as important):
SN74LS374N
DM7400N
DM7486N

Thanks alot

Tim

Exo · 3rd February 2004, 06:22 PM

Xtals are used to generate a certain frequency. But you need special circuitry to make it occilate.

Datasheets for the chips
74LS374: http://ece-www.colorado.edu/~mcclurel/dm74ls374.pdf
DM7400: http://cecsfp.cecs.evansville.edu/pdf/dm7400.pdf
DM7486: http://cecsfp.cecs.evansville.edu/pdf/dm7486.pdf

Roff · 3rd February 2004, 07:44 PM

Sunny is a manufacturer of oscillator crystals. I found this by doing a Google search for "sunny crystal" (without the quotes). The frequency of yours is most likely 18.432 MHz. See How Oscillators Work.

grrr_arrghh · 3rd February 2004, 09:48 PM

i probably should have been able to find those things myself, so thanks for helping the dum kid out.

ok, so say, for example, that i wanted a 4026 IC (driving a 7-segment display) to advance by one count, 18432 times a second. How?

Also, why such an odd number (something to do with 10s or 6s, i could understand)?

help greatly appreciated

Tim

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3rd February 2004, 06:04 PM	(permalink)
grrr_arrghh	Is it a bird?, is it a plane?, no it's an XTAL Hi I am trying to 'reverse engineer' a cirucit, and have come across a component that looks like an XTAL, and has the inscription "18.432 SUNNY" (without the quotes). Can anyone tell me if it is an XTAL, and if so, what does it really do? Also, if anyone has any simple circuits using XTALs, that would help me to understand them a bit better, I would be very greatful. Also, anyone know anything about these chips (these aren't as important): SN74LS374N DM7400N DM7486N Thanks alot Tim

3rd February 2004, 06:22 PM	(permalink)
Exo	Xtals are used to generate a certain frequency. But you need special circuitry to make it occilate. Datasheets for the chips 74LS374: http://ece-www.colorado.edu/~mcclurel/dm74ls374.pdf DM7400: http://cecsfp.cecs.evansville.edu/pdf/dm7400.pdf DM7486: http://cecsfp.cecs.evansville.edu/pdf/dm7486.pdf

3rd February 2004, 07:44 PM	(permalink)
Roff	Sunny is a manufacturer of oscillator crystals. I found this by doing a Google search for "sunny crystal" (without the quotes). The frequency of yours is most likely 18.432 MHz. See How Oscillators Work.

3rd February 2004, 09:48 PM	(permalink)
grrr_arrghh	i probably should have been able to find those things myself, so thanks for helping the dum kid out. ok, so say, for example, that i wanted a 4026 IC (driving a 7-segment display) to advance by one count, 18432 times a second. How? Also, why such an odd number (something to do with 10s or 6s, i could understand)? help greatly appreciated Tim