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turn your expensive oscilloscope into a $5 clock

T

Tim Shoppa

Jan 1, 1970
0
Hi,

Here is my suggestion to turn your oscilloscope into a clock with a PIC a 4
resistors :http://www.micro-examples.com/public/microex-navig/doc/082-pic-oscill...

I'm opened to your destructive comments :)

I remember hacking 6800 assembly code as a kid and tweaking R's and
C's in my ramp generator until I had spelled out my name on the scope
screen :).

Somewhere on the world-wide-interweb is a 50's era article that shows
how to synthesize some very nicely rendered digits onto a X-Y display
using sine/cosine waves and harmonics.

Tim.
 
B

BrunoG

Jan 1, 1970
0
DJ Delorie said:
Your schematic has +5v connected directly to GND.

The project itself is cool, though.

Well spotted !
I should have named the topic "how to turn your expensive power supply into
carbon".
Schematic has been corrected ;-)

Thanks !

Bruno
 
M

msg

Jan 1, 1970
0
Tim said:
I remember hacking 6800 assembly code as a kid and tweaking R's and
C's in my ramp generator until I had spelled out my name on the scope
screen :).

Somewhere on the world-wide-interweb is a 50's era article that shows
how to synthesize some very nicely rendered digits onto a X-Y display
using sine/cosine waves and harmonics.

There was a nice article in the Proceedings of the IRE from the '50s
about doing just that -- it was a lot like a QEX article from more
recent times.

Regards,

Michael
 
G

Guy Macon

Jan 1, 1970
0
Sorry, I was too busy using a $10,000.00 computer to replace
a 99 cent pack of playing cards while playing solitaire...
 
T

Tim Williams

Jan 1, 1970
0
I ran a WAV of something like that on my oscilloscope. Too bad my
soundcard is crummy.


Tim
 
M

Michael A. Terrell

Jan 1, 1970
0
Guy said:
Sorry, I was too busy using a $10,000.00 computer to replace
a 99 cent pack of playing cards while playing solitaire...


$10,000.00 computer? Are you interested in a used bridge, cheap?


--
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
 
J

Jamie

Jan 1, 1970
0
DJ said:
Your schematic has +5v connected directly to GND.

The project itself is cool, though.
Look again.
it's not to ground, or at least when I looked at it it wasn't.
 
D

Don Bowey

Jan 1, 1970
0
Look again.
it's not to ground, or at least when I looked at it it wasn't.

It sure looks like it's tied to ground.

Maybe you should reconsider this AND coupling capacitors.
 
It sure looks like it's tied to ground.

Maybe you should reconsider this AND coupling capacitors.

I think you will find the small schematic on the page does have the
power supply short.
When you click it for the enlargement, you get the corrected version.
Depending on your age and your monitor the one directly on the page is
difficult to see if it is correct or not.
 
G

Guy Macon

Jan 1, 1970
0
Michael said:
$10,000.00 computer? Are you interested in a used bridge, cheap?

I would rather you sell me one of these for less than $10,000:

Dell PowerEdge 6800 server
Quad 3.4GHz/800Mhz/16mb Cache, Dual-Core Intel Xeon 7140M CPUs
8GB, DDR2, 400MHz (8X1GB) Single Ranked DIMMs, (Mirrored, 4GB usable)
Dual Power Supplies
24X IDE CD-RW/DVD ROM Drive
Split HD Backplane
2X5 Hot-Pluggable Split HDD Backplane
Dula PERC4DC-PCI Express controllers, 128MB Cache ea.
Two 146GB 15KRPM SCSI U320 HotPlug Hard Drives (RAID-1[mirrored])
Three 300GB 10KRPM SCSI U320 HotPlug Hard Drives (RAID-5)
Two Intel Pro 1000MT Dual Port Gigabit Network Adapters
List price: $16,063
Price after Volume discount: $11,244

(I didn't add the cost of Redhat, VMWare, multiple Windows
licenses, seperate NAS for backup, UPS, monitor, etc...)

BTW, I don't actually play Solitaire on a computer; until
the above system gets installed it will be running a chess
program -- and beating me badly every game. :)
 
A

Arie de Muynck

Jan 1, 1970
0
BrunoG said:
Here is my suggestion to turn your oscilloscope into a clock with a PIC a
4 resistors :
http://www.micro-examples.com/public/microex-navig/doc/082-pic-oscillo-clock

I'm opened to your destructive comments :)

Neat design, generating text in Y/T mode.

Let's be constructive:

With a small SW change you could put a needle ('invisible') pulse in each
image trace at the point in time where the scope should start, the scope
should be able to trigger on that. Just have enough time between images so
the scope hold off time has finished (normally not more than 10..20% of the
sweep time).
For most scopes this removes the need for the trigger cable (which still
makes thinks look as if you are doing X-Y control). For rotten scopes one
could still connect the old trigger output.

Regards,
Arie de Muynck
 
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