Chip with simple program for Toy

[jfeng@my-deja.com]

On Thursday, July 13, 2017 at 2:39:10 PM UTC-7, rpse...@gmail.com wrote:

Looking for some one to repair my GC-1000 Healthkit atomic clock
If you suspect a power supply problem, this site

http://www.nixie.dk/~jthomas/gc1000.html

suggests replacing the 7805 with a switching regulator, plus some of the electrolytics. Someone else suggested that you can use an automobile USB power adapter in place of the 7805 (Fry's recently advertised one with a 2.4A rating for under one dollar).

 

[rickman]

jfeng@my-deja.com wrote on 7/16/2017 7:01 PM:

On Thursday, July 13, 2017 at 2:39:10 PM UTC-7, rpse...@gmail.com wrote:
Looking for some one to repair my GC-1000 Healthkit atomic clock
If you suspect a power supply problem, this site

http://www.nixie.dk/~jthomas/gc1000.html

suggests replacing the 7805 with a switching regulator, plus some of the electrolytics. Someone else suggested that you can use an automobile USB power adapter in place of the 7805 (Fry's recently advertised one with a 2.4A rating for under one dollar).

That's not a bad idea, but it will require rewiring some of the circuitry.
The switching replacements for the 7805 will drop right in and cut the power
consumption and heat generation with no external changes or case mods. I
used some in a test fixture I designed some years ago and they worked great!

--

Rick C

 

[jfeng@my-deja.com]

On Monday, July 17, 2017 at 12:45:43 PM UTC-7, rickman wrote:

That's not a bad idea, but it will require rewiring some of the circuitry..
The switching replacements for the 7805 will drop right in and cut the power
consumption and heat generation with no external changes or case mods. I
used some in a test fixture I designed some years ago and they worked great!

--

Rick C
My concern is that the maximum tolerable input voltage might not be much more than 15V, although the GC-1000 probably will not have the spikes that you would have to tolerate in a car. The USB adapter is just a 3-terminal step-down voltage regulator, albeit not in a TO-220 package, where the input and ground are easy to reach. The hardest part is opening it up to get to the +5V output. (In one rated at 1A that I cannibalized, the innards were about the same size as a TO-220, so it is possible to make it almost "drop in".) No real rewiring of the GC-1000 required unless the unregulated voltage is too high.

 

[Ralph Mowery]

In article <okj3tl$njk$1@dont-email.me>, gnuarm@gmail.com says...

jfeng@my-deja.com wrote on 7/16/2017 7:01 PM:
On Thursday, July 13, 2017 at 2:39:10 PM UTC-7, rpse...@gmail.com wrote:
Looking for some one to repair my GC-1000 Healthkit atomic clock
If you suspect a power supply problem, this site

http://www.nixie.dk/~jthomas/gc1000.html

suggests replacing the 7805 with a switching regulator, plus some of the electrolytics. Someone else suggested that you can use an automobile USB power adapter in place of the 7805 (Fry's recently advertised one with a 2.4A rating for under one dollar).

That's not a bad idea, but it will require rewiring some of the circuitry.
The switching replacements for the 7805 will drop right in and cut the power
consumption and heat generation with no external changes or case mods. I
used some in a test fixture I designed some years ago and they worked great!

Being a switching regulator it may generate some electrical noise.

I have played with some of the switching regulators from China and they
seem to regulate well.

If the 7805 has lasted this long,I would use another. They are rated
for about 30 to 35 volts input. The switchers are about the same.
The 7805 is about 50 cents and the regulator boards I got from china
were just under $ 2.00.

 

Em domingo, 23 de junho de 2002 13:51:29 UTC+2, Rubicon escreveu:

Hello,

I'm wondering in what mode do zener diodes fail?
In short circuit mode or open mode?
I intend to use some in reverse bias as voltage regulators/clamps.

I take it resistors fail in short circuit mode when subjected to too
much voltage/current - go above their Wattage rating for too long.

Andrew.
Remove ZZ from E-Mail to contact me.

They usually fail as a short circuit. Take a look at this:

https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&ved=0ahUKEwjo3PCHvqTVAhUL1hQKHR-4A-UQFghCMAM&url=http%3A%2F%2Fdownload.21dianyuan.com%2Fdownload.php%3Fid%3D170219&usg=AFQjCNF8Ykl_XFTBvaztauJ86auj8OB7aQ&cad=rja

Regards,
JoĂŁo

 

[Ralph Mowery]

In article <d65e203c-447d-4d53-b00b-01c6980f395f@googlegroups.com>,
jpfigueiredo.eng@gmail.com says...

Em domingo, 23 de junho de 2002 13:51:29 UTC+2, Rubicon escreveu:
Hello,

I'm wondering in what mode do zener diodes fail?
In short circuit mode or open mode?
I intend to use some in reverse bias as voltage regulators/clamps.

I take it resistors fail in short circuit mode when subjected to too
much voltage/current - go above their Wattage rating for too long.

Andrew.
Remove ZZ from E-Mail to contact me.

They usually fail as a short circuit. Take a look at this:

https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&ved=0ahUKEwjo3PCHvqTVAhUL1hQKHR-4A-UQFghCMAM&url=http%3A%2F%2Fdownload.21dianyuan.com%2Fdownload.php%3Fid%3D170219&usg=AFQjCNF8Ykl_XFTBvaztauJ86auj8OB7aQ&cad=rja

Most common simiconductors fail as shorted unless there is enough
current to blow the cevice open.

 

[Ian Field]

"Ralph Mowery" <rmowery28146@earthlink.net> wrote in message
news:MPG.33e1328dc0ef0b6989966@news.east.earthlink.net...

In article <d65e203c-447d-4d53-b00b-01c6980f395f@googlegroups.com>,
jpfigueiredo.eng@gmail.com says...

Em domingo, 23 de junho de 2002 13:51:29 UTC+2, Rubicon escreveu:
Hello,

I'm wondering in what mode do zener diodes fail?
In short circuit mode or open mode?
I intend to use some in reverse bias as voltage regulators/clamps.

I take it resistors fail in short circuit mode when subjected to too
much voltage/current - go above their Wattage rating for too long.

Andrew.
Remove ZZ from E-Mail to contact me.

They usually fail as a short circuit. Take a look at this:

https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&ved=0ahUKEwjo3PCHvqTVAhUL1hQKHR-4A-UQFghCMAM&url=http%3A%2F%2Fdownload.21dianyuan.com%2Fdownload.php%3Fid%3D170219&usg=AFQjCNF8Ykl_XFTBvaztauJ86auj8OB7aQ&cad=rja


Most common simiconductors fail as shorted unless there is enough
current to blow the cevice open.

And some dodgy and/or counterfeit rectifiers that crack in
two..................

 

[Pimpom]

Em domingo, 23 de junho de 2002 13:51:29 UTC+2, Rubicon escreveu:

Hello,

I'm wondering in what mode do zener diodes fail?
In short circuit mode or open mode?
I intend to use some in reverse bias as voltage regulators/clamps.

I take it resistors fail in short circuit mode when subjected to too
much voltage/current - go above their Wattage rating for too long.

Andrew.
Remove ZZ from E-Mail to contact me.

Wrong presumption about resistors. During some 30 years of
repairing work, I came across just two resistors that failed
short. All the others failed open. Semiconductors, on the other
hand fail short more often than open, or have excessive leakage
in the reverse direction.

 

[Pimpom]

On 8/5/2017 2:47 PM, Pimpom wrote:

Em domingo, 23 de junho de 2002 13:51:29 UTC+2, Rubicon escreveu:
Hello,

I'm wondering in what mode do zener diodes fail?
In short circuit mode or open mode?
I intend to use some in reverse bias as voltage regulators/clamps.

I take it resistors fail in short circuit mode when subjected to too
much voltage/current - go above their Wattage rating for too long.

Andrew.
Remove ZZ from E-Mail to contact me.

Wrong presumption about resistors. During some 30 years of
repairing work, I came across just two resistors that failed
short. All the others failed open. Semiconductors, on the other
hand fail short more often than open, or have excessive leakage
in the reverse direction.

Just noticed that the OP asked the question on June 23, 2002!

 

[Ian Field]

"Pimpom" <Pimpom@invalid.com> wrote in message
newsm42ff$s3p$1@news.albasani.net...

Em domingo, 23 de junho de 2002 13:51:29 UTC+2, Rubicon escreveu:
Hello,

I'm wondering in what mode do zener diodes fail?
In short circuit mode or open mode?
I intend to use some in reverse bias as voltage regulators/clamps.

I take it resistors fail in short circuit mode when subjected to too
much voltage/current - go above their Wattage rating for too long.

Andrew.
Remove ZZ from E-Mail to contact me.

Wrong presumption about resistors. During some 30 years of repairing work,
I came across just two resistors that failed short. All the others failed
open. Semiconductors, on the other hand fail short more often than open,
or have excessive leakage in the reverse direction.

Resistors of a certain type of construction can go low or short - sounds
like you've encountered about as many as I have.

 

[John Larkin]

On Sun, 6 Aug 2017 18:55:20 +0100, "Ian Field"
<gangprobing.alien1@virginmedia.com> wrote:

"Pimpom" <Pimpom@invalid.com> wrote in message
newsm42ff$s3p$1@news.albasani.net...

Em domingo, 23 de junho de 2002 13:51:29 UTC+2, Rubicon escreveu:
Hello,

I'm wondering in what mode do zener diodes fail?
In short circuit mode or open mode?
I intend to use some in reverse bias as voltage regulators/clamps.

I take it resistors fail in short circuit mode when subjected to too
much voltage/current - go above their Wattage rating for too long.

Andrew.
Remove ZZ from E-Mail to contact me.

Wrong presumption about resistors. During some 30 years of repairing work,
I came across just two resistors that failed short. All the others failed
open. Semiconductors, on the other hand fail short more often than open,
or have excessive leakage in the reverse direction.

Resistors of a certain type of construction can go low or short - sounds
like you've encountered about as many as I have.

Carbon comps can fail shorted, but they are rare these days. Film-type
resistors usually fail open.

I've had the metal-jacket military type wirewound resistors fail
shorted, from thermal cycling fatigue.


--

John Larkin Highland Technology, Inc trk

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

Bonjour,je recherche un appareil de contrĂ´le, a faire soi-mĂŞme, un dĂŠphaseur rĂŠglable.
Toutes mes recherches sont restÊes vaines. Quel est votre avis sur ce sujet ? Je vous remerçie de votre soutien. Salutations distinguÊes.

 

[amdx]

On 9/8/2017 4:18 AM, G.GABARRA@free.fr wrote:

Bonjour,je recherche un appareil de contrĂ´le, a faire soi-mĂŞme, un dĂŠphaseur rĂŠglable.
Toutes mes recherches sont restÊes vaines. Quel est votre avis sur ce sujet ? Je vous remerçie de votre soutien. Salutations distinguÊes.

AKA as,
"Hello, I am looking for a control device, to do yourself, an adjustable
phase shifter.
All my research has been in vain. What is your opinion on this
subject? I thank you for your support. Best regards."

 

[Jim Thompson]

On Fri, 8 Sep 2017 06:51:05 -0500, amdx <nojunk@knology.net> wrote:

On 9/8/2017 4:18 AM, G.GABARRA@free.fr wrote:
Bonjour,je recherche un appareil de contrôle, a faire soi-męme, un déphaseur réglable.
Toutes mes recherches sont restées vaines. Quel est votre avis sur ce sujet ? Je vous remerçie de votre soutien. Salutations distinguées.

AKA as,
"Hello, I am looking for a control device, to do yourself, an adjustable
phase shifter.
All my research has been in vain. What is your opinion on this
subject? I thank you for your support. Best regards."

Frequency range / phase-shift range?

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| STV, Queen Creek, AZ 85142 Skype: skypeanalog | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I'm looking for work... see my website.

Thinking outside the box...producing elegant & economic solutions.

 

[Cursitor Doom]

On Fri, 08 Sep 2017 07:52:45 -0700, Jim Thompson wrote:

> Frequency range / phase-shift range?

ENGLISH??
The RFD states this is an English language group.





--
This message may be freely reproduced without limit or charge only via
the Usenet protocol. Reproduction in whole or part through other
protocols, whether for profit or not, is conditional upon a charge of
GBP10.00 per reproduction. Publication in this manner via non-Usenet
protocols constitutes acceptance of this condition.

 

[Jim Thompson]

On Sat, 9 Sep 2017 21:27:50 -0000 (UTC), Cursitor Doom
<curd@notformail.com> wrote:

On Fri, 08 Sep 2017 07:52:45 -0700, Jim Thompson wrote:

Frequency range / phase-shift range?

ENGLISH??
The RFD states this is an English language group.

Be nice. The way things are going you'll soon need to speak "leftist
grunt" >:-}

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| STV, Queen Creek, AZ 85142 Skype: skypeanalog | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I'm looking for work... see my website.

Thinking outside the box...producing elegant & economic solutions.

 

[Cursitor Doom]

On Wed, 13 Sep 2017 11:02:00 -0700, Jim Thompson wrote:

Be nice. The way things are going you'll soon need to speak "leftist
grunt" >:-}

Ah, mais oui! Je parle le monkey jabber!
:->



--
This message may be freely reproduced without limit or charge only via
the Usenet protocol. Reproduction in whole or part through other
protocols, whether for profit or not, is conditional upon a charge of
GBP10.00 per reproduction. Publication in this manner via non-Usenet
protocols constitutes acceptance of this condition.

 

[default]

On Wed, 13 Sep 2017 14:50:57 +0100, Adrian Caspersz
<email@here.invalid> wrote:

I've got a cheap (Ł25/$30) hand held bagless 500W vaccum cleaner made
out of ABS plastic that must create a lot of static electricity when in
operation.

http://www.beldray.com/beldray-bel0427-quick-vac-lite-red.html

I'd quite like to use it to clean dust out from electronic equipment.

From another vacuum cleaner (industrial photo-copier maintenance thing)
I have a short conductive hose and various end tools, so I'm almost
there; but I need to ground something - possibly the hose coupling to
the cleaner.

Would that work? Or would the passing air circumvent it, and become
charged anyway.

If so, I think I might need to make conductive and internally ground
parts of the vacuum cleaner, using metal loaded paint and/or aluminium
tape. Work that I want to avoid if possible.

Is there static present at the plastic tip? Check it before you get
carried away fixing a problem that doesn't exist.

I got a fairly new "scorpion" vac and there is no discernable static
charge at the inlet nozzle.

 

Jim Thompson wrote:

On Fri, 8 Sep 2017 06:51:05 -0500, amdx <noj...@knology.net> wrote:
On 9/8/2017 4:18 AM, G.GA...@free.fr wrote:
Bonjour,je recherche un appareil de contrĂ´le, a faire soi-mĂŞme, un dĂŠphaseur rĂŠglable.
Toutes mes recherches sont restÊes vaines. Quel est votre avis sur ce sujet ? Je vous remerçie de votre soutien. Salutations distinguÊes.

AKA as,
"Hello, I am looking for a control device, to do yourself, an adjustable
phase shifter.
All my research has been in vain. What is your opinion on this
subject? I thank you for your support. Best regards."

Frequency range / phase-shift range?

How would you ask that in french? Dans paramètres pour le contrôle de frÊquence par ou a ou ?
(just a guess)

 

Mr. Man-wai Chang wrote:
On 31/12/2016 4:44 PM, Bill wrote:

I propose that, in the new year, we more proactively discourage posts
from, or replies to, anyone who wishes to act like less than a
gentle-person (and you know the folks I'm talking about). What do you
think, can we take (back) control together?

As long as it's mathematical ....

This music video reminded me of the movie The Mask!

Against All Odds by Phil Collins
https://www.youtube.com/watch?v=uVjEcIANv1o

The Mask Trailer
https://www.youtube.com/watch?v=Pmainxd74ac


--
@~@ Remain silent! Drink, Blink, Stretch! Live long and >prosper!!
/ v \ Simplicity is Beauty!
/( _ )\ May the Force and farces be with you!
^ ^ (x86_64 Ubuntu 9.10) Linux 2.6.39.3
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

Is 'against all odds' the most depressing song ever? or what?