Driver to drive?

It kept bugging me that this little player is uncontrollable as far a charging goes.
So decided to modify it.
After all this is a design group...

So still had some Microchip MCP73831T -2ACI (4.2V) lipo charger chips,
http://www.ebay.com/itm/360821069439
I mean 10 for 1$60, I payed 3$60 for 10 last year...
Anyways,
this is what I did, left the (it was 6.8 Ohm) series resistor in, removed the series diode,
added some tantalum 2.2 uF caps (no they draw no measurable current):
http://panteltje.com/pub/chinese_5_dollar_mp3_player_modification_circuit_diagram_IMG_4749.JPG

Scratched some solder mask away and mounted the stuff:
http://panteltje.com/pub/chinese_5_dollar_mp3_player_modification_close_up_IMG_4745.JPG

And looked up that MCP73831 programming resistor, decided to settle for 22k should give about 30 mA in the datasheet.

So there you are:
http://panteltje.com/pub/chinese_5_dollar_mp3_player_modification_charging_IMG_4743.JPG

It is now chargibg, BUT WILL IT STOP????
SUSPENSE!!!
More in the next episode of
LOL
 
I wrote:

It kept bugging me that this little player is uncontrollable as far a charging goes.
So decided to modify it.
After all this is a design group...

So still had some Microchip MCP73831T -2ACI (4.2V) lipo charger chips,
http://www.ebay.com/itm/360821069439
I mean 10 for 1$60, I payed 3$60 for 10 last year...
Anyways,
this is what I did, left the (it was 6.8 Ohm) series resistor in, removed the series diode,
added some tantalum 2.2 uF caps (no they draw no measurable current):
http://panteltje.com/pub/chinese_5_dollar_mp3_player_modification_circuit_diagram_IMG_4749.JPG

Scratched some solder mask away and mounted the stuff:
http://panteltje.com/pub/chinese_5_dollar_mp3_player_modification_close_up_IMG_4745.JPG

And looked up that MCP73831 programming resistor, decided to settle for 22k should give about 30 mA in the datasheet.

So there you are:
http://panteltje.com/pub/chinese_5_dollar_mp3_player_modification_charging_IMG_4743.JPG

It is now chargibg, BUT WILL IT STOP????
SUSPENSE!!!
More in the next episode of
LOL
Click to expand...

PS,
had to remove the second tantaal cap over the battery,
as leaving it in made it go to 'PC connect mode' every time.
Dunno why.
The Microchip datasheet goes into the value of this decoupling cap in a long story
and recommends (states) that it should be at least 4.7uF.

Well, I cheched with the scope without the cap and I see no instabilities
within the scope's range of about up to 30 MHz.
Neither does it interfere with FM radio...

So some suspense remains.
 
On Friday, March 6, 2015 at 8:37:10 AM UTC+1, Paul Conners wrote:
180 vdc, 1 hp, pm motor.

with dmm what should be the first tests? motor is in a difficult location to
examine visually so i'd like to start with electrical evaluation.

it measures 1.2 ohms between the 2 armature leads.
Click to expand...

Do you have another reference motor to test against?

Check the inductance
Check dielectric breakdown to earth
Apply short voltage pulse, and check the ringing voltage with a scope (never done this, but perhaps you can get it to move just a quarter rotation and when you let go again the relaxation of the axis will produce a EMF voltage back, that you can monitor)

Apply DC voltage, take cover..

Cheers

Klaus
 
On Monday, March 9, 2015 at 1:20:54 AM UTC-4, Paul Conners wrote:
180 vdc, 1 hp, pm motor.


Motor out of the equipment. Turning armature slowly, the resistance reading
between the armature leads varies from a low of 2.3 to high of 10; most are
around 6-7 ohms. Resistance of each lead to motor frame is minimum 150K up to
over 1 meg.

What's normal for such a motor?

Thanks.
Click to expand...

I have no expertise so can't answer on what is normal. But I am pretty sure the resistance ought to be uniform. So sounds like the armature needs to be turned or at least have the surface cleaned. The 2.3 ohm reading might indicate a short in the armature.

But DC motors will work at voltages much lower than the name plate voltage.
I would probably just connect a 12 volt supply to it and see if it turns slowly.

Dan
 
Little late but I have fixed these 3310's in the past (instrumentation tech since 1960) and your failure is fairly common; transistor(s) 2N3904 or 06 in the output stage driving the power output transistors have opened up producing a halfwave rectified like sinewave. These are Q13 & 14; replace with better 2N4401 and 03 respectively to reduce these failures.

1941WISEOWL
 
On Fri, 13 Mar 2015 16:36:13 -0500, Tim Wescott wrote:

I think a malfunction generator would be a GREAT engineering and
technical teaching tool! Build you system, point the malfunction
generator at it, pull the trigger...
Click to expand...

They exist.

The device/instrument is commonly known as a "stimulator".

You would find them in places like huge anechoic chambers, providing
(stimulating)simulated signals within the chamber. They typically also
involve methods to properly monitor and observe said stimulations.

Whether it is a hard wired signal or an RF radiation, the process is
still known as stimulation, when a non-real signal is 'created' to
facilitate functional testing or 'malfunctory' diagnostic analysis.
 
On Fri, 13 Mar 2015 16:36:13 -0500, Tim Wescott wrote:

For training you'd want to have the 1st, 2nd, 3rd, etc., malfunctions
ranked by ease of diagnosis, expense of repair, difficulty of repair
etc.

It's a brilliant idea, and I just want to see how soon they are
available for purchase on eBay.
Click to expand...

Nearly all are custom to the scenario and gear.

Even more so than say your average HV supply, which is almost always
custom to the application as well. There very few 'off-the-shelf' HV
supplies and none that are broadly load dynamic such that there could be.

Stimulation is far worse. Zero off the shelf 'jobs'.

All are custom to the application and types of signals both being
stimulated as well as those circuit elements being monitored for response
to the stimulus. Timings are critical typically, so line lengths, etc.
all have to be monitored and adjusted for with phase delay and frequency
shift calibration elements, all so that the monitoring takes place such
that a snapshot of the stimulus and a snapshot of the monitored response
are timed together to make the gathered data usable as information.
 
On Fri, 13 Mar 2015 13:39:32 -0700, GGP4141 wrote:

Little late but I have fixed these 3310's in the past (instrumentation
tech since 1960) and your failure is fairly common; transistor(s) 2N3904
or 06 in the output stage driving the power output transistors have
opened up producing a halfwave rectified like sinewave. These are Q13 &
14; replace with better 2N4401 and 03 respectively to reduce these
failures.

1941WISEOWL
Click to expand...

I don't remember the thread, but I like the title.

I think a malfunction generator would be a GREAT engineering and technical
teaching tool! Build you system, point the malfunction generator at it,
pull the trigger...


KZAP!


A malfunction is induced! You diagnose it, fix it, maybe engineer it out
of the product, and repeat.

Of course, the malfunction generator would need many modes and setup
features: for engineering you'd want to have a dial that lets you induce
the 1st, 2nd, 3rd (etc.) most likely malfunction, as well as malfunctions
due to age, malfunctions due to improper installation, etc.

For training you'd want to have the 1st, 2nd, 3rd, etc., malfunctions
ranked by ease of diagnosis, expense of repair, difficulty of repair etc.

It's a brilliant idea, and I just want to see how soon they are available
for purchase on eBay.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
 
On Thursday, 26 March 2015 12:08:40 UTC+11, Gary Eickmeier wrote:
> I didn't think we were supposed to send images on this group.

URLs are fine.Nobody in their right mind clicks on a URL from a source they don't trust, even if they've got all the internet security software you can buy, but most of the people who have been posting here have been doing it for years. We have at least our fair share of psychopaths, but their psychopathology doesn't seem to include Trojan horse web-sites.

The basic problem with images was their size.

There are usenet group that tolerate binary files, but few providers offer access to them. Porn enthusiasts used to use them to peddle disreputable images, but that's history now.

--
Bill Sloman, Sydney
 
I didn't think we were supposed to send images on this group.

Gary Eickmeier


"Ramon F Herrera" <ramon@patriot.net> wrote in message
news:qoAQw.131855$bk5.103888@fx06.iad...
See attachment.

That is a beautiful work of art, isn't it?

I found it here:

http://goo.gl/wnn8R4
[In Google Drive, you only click ONCE]

Click on "Speaker Recognition (NIST).pdf"

Those sharp curves cannot possibly come from a human speech system, can
they?

-Ramon
Click to expand...
 
On 3/25/15 9:13 PM, Gary Eickmeier wrote:
I didn't think we were supposed to send images on this group.
Click to expand...

well, it's USENET. there aren't any rules. and least no rule-enforcers.


--

r b-j rbj@audioimagination.com

"Imagination is more important than knowledge."
 
On 26/03/2015 03:07, robert bristow-johnson wrote:
On 3/25/15 9:13 PM, Gary Eickmeier wrote:
I didn't think we were supposed to send images on this group.


well, it's USENET. there aren't any rules. and least no rule-enforcers.
Click to expand...
And the message is text only, containing a URL linking to an image, so
within the rules for text only groups.

It's the same principle as linking to a Soundcloud file...

Incidentally, some news servers do either strip binary attachments from
posts or just delete posts with binaries before they get onto the server.

--
Tciao for Now!

John.
 
"John Williamson" <johnwilliamson@btinternet.com> wrote in message
news:cnhtrfFedreU1@mid.individual.net...
On 26/03/2015 03:07, robert bristow-johnson wrote:
On 3/25/15 9:13 PM, Gary Eickmeier wrote:
I didn't think we were supposed to send images on this group.


well, it's USENET. there aren't any rules. and least no rule-enforcers.


And the message is text only, containing a URL linking to an image, so
within the rules for text only groups.

It's the same principle as linking to a Soundcloud file...

Incidentally, some news servers do either strip binary attachments from
posts or just delete posts with binaries before they get onto the server.
Click to expand...

No, it is not a link, it is a file sent along with his text message. I go to
a lot of trouble to post pictures or audio to a web site somewhere because I
should not send them in a message.

Gary
 
"Gary Eickmeier" <geickmei@tampabay.rr.com> wrote in message
news:I1RQw.151290$qY.144643@fx01.iad...
"John Williamson" <johnwilliamson@btinternet.com> wrote in message
news:cnhtrfFedreU1@mid.individual.net...
On 26/03/2015 03:07, robert bristow-johnson wrote:
On 3/25/15 9:13 PM, Gary Eickmeier wrote:
I didn't think we were supposed to send images on this group.


well, it's USENET. there aren't any rules. and least no
rule-enforcers.


And the message is text only, containing a URL linking to an image, so
within the rules for text only groups.

It's the same principle as linking to a Soundcloud file...

Incidentally, some news servers do either strip binary attachments from
posts or just delete posts with binaries before they get onto the server.

No, it is not a link, it is a file sent along with his text message. I go
to a lot of trouble to post pictures or audio to a web site somewhere
because I should not send them in a message.

Gary
Click to expand...

OK, for the quibblers out there it is both. Looks like he meant to send a
link, then also attached a 160k .png file to the message.

Gary
 
On 26/03/2015 10:34, Gary Eickmeier wrote:
"Gary Eickmeier" <geickmei@tampabay.rr.com> wrote in message
news:I1RQw.151290$qY.144643@fx01.iad...

"John Williamson" <johnwilliamson@btinternet.com> wrote in message
news:cnhtrfFedreU1@mid.individual.net...
On 26/03/2015 03:07, robert bristow-johnson wrote:
On 3/25/15 9:13 PM, Gary Eickmeier wrote:
I didn't think we were supposed to send images on this group.
Snip
It's the same principle as linking to a Soundcloud file...

Incidentally, some news servers do either strip binary attachments from
posts or just delete posts with binaries before they get onto the server.

No, it is not a link, it is a file sent along with his text message. I go
to a lot of trouble to post pictures or audio to a web site somewhere
because I should not send them in a message.

Gary

OK, for the quibblers out there it is both. Looks like he meant to send a
link, then also attached a 160k .png file to the message.
Click to expand...
As I said, some news servers strip attachments in text only groups. It
appears that News Individual Net is one of them. I saw no attachment.


--
Tciao for Now!

John.
 
On 3/25/2015 8:13 PM, Gary Eickmeier wrote:
I didn't think we were supposed to send images on this group.

Gary Eickmeier
Click to expand...

Gary:

"There are no worse jails than those which we build for ourselves."

-Moi
 
I was under the impression that people who participate in these
newsgroups knew about voice signals and spectrograms?

Now some have obtained a master's degree in "Made Up Usenet Rules Police"?

Seems to be a step backwards, if you ask me.


-Ramon F Herrera, Internet Pioneer and Co-Founder while at MIT

(*) Muchas Gracias, Al!!!

http://en.wikipedia.org/w/index.php?title=Al_Gore_and_information_technology

ps: Al Gore was inducted to the Internet Hall of Fame, where Social
Conservatives need not apply.

pps: Mr. Gore was also appointed by his best friend, Steve Jobs, as
Member of the Apple Board of Directors, where Social Conservatives need
not apply.



On 3/25/2015 10:07 AM, Ramon F Herrera wrote:
See attachment.

That is a beautiful work of art, isn't it?

I found it here:

http://goo.gl/wnn8R4
[In Google Drive, you only click ONCE]

Click on "Speaker Recognition (NIST).pdf"

Those sharp curves cannot possibly come from a human speech system, can
they?

-Ramon
Click to expand...
 
Gary Eickmeier <geickmei@tampabay.rr.com> wrote:
No, it is not a link, it is a file sent along with his text message. I go to
a lot of trouble to post pictures or audio to a web site somewhere because I
should not send them in a message.
Click to expand...

I bet a nickel you're using Outlook, which displays the link as if it were
a local file. This is specifically a function of your news client, other
people do not see this.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
 
On 26/03/2015 13:33, Scott Dorsey wrote:
Gary Eickmeier <geickmei@tampabay.rr.com> wrote:

No, it is not a link, it is a file sent along with his text message. I go to
a lot of trouble to post pictures or audio to a web site somewhere because I
should not send them in a message.

I bet a nickel you're using Outlook, which displays the link as if it were
a local file. This is specifically a function of your news client, other
people do not see this.
--scott
Click to expand...
Does Outlook do news now? I eschewed it many years ago because it
didn't, and Outlook Express which does is/ was <Mode=polite> not a good
program for any purpose.

<Checks> Ah, you need a plugin, which calls Outlook Express or Vista
Livemail to read news.

I'll stick to Thunderbird for now.

--
Tciao for Now!

John.
 
"Ramon F Herrera" <ramon@conexus.net> wrote in message
news:bHSQw.132793$bk5.67724@fx06.iad...
I was under the impression that people who participate in these newsgroups
knew about voice signals and spectrograms?

Now some have obtained a master's degree in "Made Up Usenet Rules Police"?

Seems to be a step backwards, if you ask me.


-Ramon F Herrera, Internet Pioneer and Co-Founder while at MIT
Click to expand...

Well, I thought it was for a good reason, the bandwidth that would be taken
away from all of our rapidfire conversations about shockmounts and XLR.

Scott, I am using Outlook Express on my ancient Win XP computer. I subscribe
to usenet with newshosting.com. What I see in Herrera's message is the basic
message with a paper clipped attachment that is a 160k .png file.

Gary
 
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