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Need help finding a schematic for a Quasar TV/VCR combo
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JeffM
electronics forum Guru


Joined: 02 May 2005
Posts: 1007

PostPosted: Fri May 05, 2006 7:38 pm    Post subject: Re: replace XTAL with Crystal? Reply with quote

Tek wrote:
Quote:
I cannot find the correct frequency XTAL
but crystals are easy to get.

Geoff wrote:
Quote:
If you don't know that xtal is a common abbreviation for crytal,
then by what basis have you decided that you want to change it,
that the unit can 'handle it', and you have the technical skill to do it ?

Daniel wrote:
Quote:
Good question, Geoff, but what's more worrying
is that the places Tek is looking for XTALs/Crystals
don't seem to indicate that they are the same thing!

What's REALLY fascinating
is that Geoff dug back just shy of 2 years
to find a post to which he would respond.
OP: May 8 2004
If Tek is still looking, it must not be a high priority.

Also worth noting that alt.electronics.analog was never a valid group.
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AZ Woody
electronics forum beginner


Joined: 25 Jan 2006
Posts: 2

PostPosted: Sat May 06, 2006 2:28 am    Post subject: Re: replace XTAL with Crystal? Reply with quote

Isn't there a manufacturer/PN on the case of the device that's to be
replaced?

Seems a simple search will determine what this part really is...

"Don Bowey" <dbowey@comcast.net> wrote in message
news:C080B919.3131E%dbowey@comcast.net...
Quote:
On 5/5/06 3:49 AM, in article 7cbm521n17fd2t6ui424frqslevfrmrekp@4ax.com,
"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote:

On Thu, 04 May 2006 20:57:39 -0700, the renowned Don Bowey
dbowey@comcast.net> wrote:

On 5/4/06 5:51 PM, in article
445a9430$0$29303$88260bb3@free.teranews.com,
"Daniel" <dxmm@nospam.albury.net.au> wrote:

Geoff wrote:
Tek wrote:
I want to change the clock value in a device.
I know the unit can handle it but I wanted to ask if anyone know if
there will be an issue.
The current clock generator is an Xtal... I cannot find the correct
frequency XTAL but crystals are easy to get.

thanks for any advice!

If you don't know that xtal is a common abbreviation for crytal, then
by
what basis have you decided that you want to change it, that the unit
can
'handle it', and you have the technical skill to do it ?

geoff



Good question, Geoff, but what's more worrying is that the places Tek
is
looking for XTALs/Crystals don't seem to indicate that they are the
same
thing!

Your observation is pointless; XTAL and crystal *are* the same.

On the other hand, you can buy a xtal/crystal oscillator that is more
than
just the xtal/crystal.

Could you subsitute an OSC?


Best regards,
Spehro Pefhany

Substitute it for what?

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Lostgallifreyan
electronics forum Guru Wannabe


Joined: 13 Apr 2006
Posts: 241

PostPosted: Sat May 06, 2006 2:42 am    Post subject: Re: replace XTAL with Crystal? Reply with quote

"JeffM" <jeffm_@email.com> wrote in
news:1146857901.676148.86890@i39g2000cwa.googlegroups.com:

Quote:
Tek wrote:
I cannot find the correct frequency XTAL
but crystals are easy to get.

Geoff wrote:
If you don't know that xtal is a common abbreviation for crytal,
then by what basis have you decided that you want to change it,
that the unit can 'handle it', and you have the technical skill to do
it ?

Daniel wrote:
Good question, Geoff, but what's more worrying
is that the places Tek is looking for XTALs/Crystals
don't seem to indicate that they are the same thing!

What's REALLY fascinating
is that Geoff dug back just shy of 2 years
to find a post to which he would respond.
OP: May 8 2004
If Tek is still looking, it must not be a high priority.

Also worth noting that alt.electronics.analog was never a valid group.



Great, does this mean we could debate my want of a nice 8-pin DIL standard
IC for converting either frequency (or voltage representing it) to voltage
representing pitch? (Log conversion). Smile I'm still hoping that thread of
mine, still hopefully current, might get some more suggestions for this..

(In group: sci.electronics.components btw, I don't like to crosspost.)
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Backfire Bob
electronics forum beginner


Joined: 06 May 2006
Posts: 1

PostPosted: Sat May 06, 2006 2:53 am    Post subject: Re: replace XTAL with Crystal? Reply with quote

"AZWoody" <Reply@here.not.email> wrote in message
news:WQT6g.34$WQ2.2533@news.uswest.net...
Quote:
Isn't there a manufacturer/PN on the case of the device that's to be
replaced?

Why bother! this poor schlunk cant figure out which end of the soldering

iron to hold
until its too late....
He is going to "Soup it up" with a different XTAL hahahaha.....Righty-Oh!
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Michael A. Terrell
electronics forum Guru


Joined: 24 Mar 2005
Posts: 2291

PostPosted: Sun May 07, 2006 9:17 am    Post subject: Re: replace XTAL with Crystal? Reply with quote

Backfire Bob wrote:
Quote:

"AZWoody" <Reply@here.not.email> wrote in message
news:WQT6g.34$WQ2.2533@news.uswest.net...
Isn't there a manufacturer/PN on the case of the device that's to be
replaced?

Why bother! this poor schlunk cant figure out which end of the soldering
iron to hold
until its too late....
He is going to "Soup it up" with a different XTAL hahahaha.....Righty-Oh!


People did it with early personal computers to speed them up. As
long as only the CPU clock is changed, and has no effect on other system
timing, and the change is small it would work, but it is likely just a
waste of time and effort like the ones who converted a 10 MHz computer
to 12 MHz.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
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Michael A. Terrell
electronics forum Guru


Joined: 24 Mar 2005
Posts: 2291

PostPosted: Sun May 07, 2006 9:22 am    Post subject: Re: replace XTAL with Crystal? Reply with quote

JeffM wrote:
Quote:

Also worth noting that alt.electronics.analog was never a valid group.


It may be valid on a few servers but not be an official newsgroup
that went through the proper creation process.

On the other hand, news:alt.electronics.analog.vlsi is a valid group.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
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Michael A. Terrell
electronics forum Guru


Joined: 24 Mar 2005
Posts: 2291

PostPosted: Sat May 13, 2006 6:48 pm    Post subject: Re: USD$35 manufacture 2layers+2silk+2mask pcb prototype!!(NJPCB) Reply with quote

"rtt55t_y@126.com" wrote:
Quote:

if any question, please send mail us!!!!!!

I did, Mr Spammer, as well as to Google Groups and to your ISP at:
abuse@jsinfo.net



--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
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JeffM
electronics forum Guru


Joined: 02 May 2005
Posts: 1007

PostPosted: Sun May 14, 2006 5:41 am    Post subject: Spammers aren't always male Reply with quote

was: USD$35 manufacture 2layers+2silk+2mask pcb prototype!!

Quote:
if any question, please send mail us!!!!!!
rtt55t_y@126.com

I did, Mr Spammer, as well as to Google Groups and to your ISP
Michael A. Terrell

Thompson made the same error. Cool
http://groups.google.com/group/sci.electronics.design/browse_frm/thread/ca3fcd7bc788bce/9c45b7a6d08ad1e0?q=Ms.-Ding-JiaBao
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Michael A. Terrell
electronics forum Guru


Joined: 24 Mar 2005
Posts: 2291

PostPosted: Sun May 14, 2006 6:27 pm    Post subject: Re: Spammers aren't always male Reply with quote

JeffM wrote:
Quote:

was: USD$35 manufacture 2layers+2silk+2mask pcb prototype!!

if any question, please send mail us!!!!!!
rtt55t_y@126.com

I did, Mr Spammer, as well as to Google Groups and to your ISP
Michael A. Terrell

Thompson made the same error. Cool
http://groups.google.com/group/sci.electronics.design/browse_frm/thread/ca3fcd7bc788bce/9c45b7a6d08ad1e0?q=Ms.-Ding-JiaBao


Not all the women on usenet are female, either.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
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William P.N. Smith
electronics forum addict


Joined: 02 Nov 2005
Posts: 80

PostPosted: Fri May 19, 2006 12:22 am    Post subject: Re: lets start over... device to be build. Reply with quote

"Imp" <semmons@ca.sympatico> wrote:
Quote:
So far a two axis Accelerometer
seems to be the best way to sense the movement of the device. Any ideas?

Don't see any spec for angle accuracy, or if there are limits to the
angle it might be placed at, but how about a 2-axis
potentiometer-based joystick with a weight on the end?

Do you need to detect movement in all six axes?
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Imp
electronics forum beginner


Joined: 18 May 2006
Posts: 6

PostPosted: Fri May 19, 2006 12:39 am    Post subject: Re: lets start over... device to be build. Reply with quote

"William P.N. Smith" <news2006c@compusmiths.com> wrote in message
news:op3q625ef3hdq53vf5n70hah59g9gfemp6@4ax.com...
Quote:

Don't see any spec for angle accuracy, or if there are limits to the
angle it might be placed at, but how about a 2-axis
potentiometer-based joystick with a weight on the end?

Do you need to detect movement in all six axes?

First the device can not be large.. it can be about 2" - 3" thick and no
more then 10"

and it MUST be made from design circuits.... it can not be made of joysticks
or other things like that... IT MUST BE A PURE CIRCUIT.
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Lostgallifreyan
electronics forum Guru Wannabe


Joined: 13 Apr 2006
Posts: 241

PostPosted: Fri May 19, 2006 12:59 am    Post subject: Re: lets start over... device to be build. Reply with quote

William P.N. Smith <news2006c@compusmiths.com> wrote in
news:op3q625ef3hdq53vf5n70hah59g9gfemp6@4ax.com:

Quote:
but how about a 2-axis
potentiometer-based joystick with a weight on the end?


Got to that one already, but I don't think my comments were entirely
appreciated. >:)

You're right though, there is no way we can meaningfully suggest anything,
we know nothing of the degree of accuracy required, Hell, we don;t even
know if on-off or proportional sensing is required.

What would help is a few sentences describing the context. Like I said, is
it a burglar alarm, or a space station gyro? Sure I'm being flippant, but
without some prosaic context it;s hard to say anything meaning ful about
this. Anyway, I'm tired and in a ratty mood so I'll leave well alone and
let others say better stuff than I can do here.
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William P.N. Smith
electronics forum addict


Joined: 02 Nov 2005
Posts: 80

PostPosted: Fri May 19, 2006 1:56 am    Post subject: Re: lets start over... device to be build. Reply with quote

"Imp" <semmons@ca.sympatico> wrote:
Quote:
First the device can not be large.. it can be about 2" - 3" thick and no
more then 10"

I've got some 2-axis joysticks that are only an inch or so on each
side.

Quote:
and it MUST be made from design circuits.... it can not be made of joysticks
or other things like that... IT MUST BE A PURE CIRCUIT.

What are "design circuits"? If it has to be completely solid state,
that (arguably) rules out accellerometers, as they have moving parts.
What are you left with, some kind of differential GPS, electric field
changes, or a 3D magnetic compass?

You forgot to answer:
>> Do you need to detect movement in all six axes?
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William P.N. Smith
electronics forum addict


Joined: 02 Nov 2005
Posts: 80

PostPosted: Fri May 19, 2006 1:58 am    Post subject: Re: lets start over... device to be build. Reply with quote

Lostgallifreyan <no-one@nowhere.net> wrote:
Quote:
William P.N. Smith <news2006c@compusmiths.com> wrote in

but how about a 2-axis
potentiometer-based joystick with a weight on the end?

Got to that one already, but I don't think my comments were entirely
appreciated. >Smile

I missed the original discussion, and took the OP at his word that he
wanted to start over.

I agree that we really need to know if this is a homework assignment,
a theoretical design, or a product.
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James Thompson
electronics forum Guru Wannabe


Joined: 08 Mar 2006
Posts: 120

PostPosted: Fri May 19, 2006 7:32 am    Post subject: Re: lets start over... device to be build. Reply with quote

"Imp" <semmons@ca.sympatico> wrote in message
news:vt7bg.9019$aa4.311043@news20.bellglobal.com...
Quote:
Ok. to start again. To start with no mercury switches may be used. I am
looking to build a box device that has these features:



1.. one switch for turning it on and off
2.. one led to light up when armed
3.. the ability to be armed when placed at any angle without being
adjusted in anyway
4.. To sound an alarm upon being moved
5.. the ability to run off a 9V battery


These are the conditions for the device. So far a two axis Accelerometer
seems to be the best way to sense the movement of the device. Any ideas?




Does it need the ability to go bang?

Use hall effect sensors around a small magnet suspended with springs. Or
better yet use coils configured into a pyramid design with a magnet
suspended in the middle with springs, when the thing is moved it will
generate small signals in the coils that your circuit will detect.
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