Driver to drive?

On Wednesday, January 28, 2015 at 8:49:48 PM UTC, humbled valiant wrote:
http://www.stonetabernacle.com/INTERCOM_CIRCUIT.html

is my intercom/telephone/sounder/strobe circuit between shop and garage. It
utilizes an assembled part (P1) on the schematic,

http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2151671_-1

The shop has machinery that needs a loud bell and a strobe when the phone
rings. It also needs these to get attention for intercom paging. This is
needed from the house to the shop and from the shop to the house.

I haven't built the thing yet. All the materials are expensive.

Notice that the intercom is made up of 2 wired phones with one of the phone
wires cut and a 9v battery and 200 ohm resistor inserted in series with it.
This makes for a cheap intercom but it also needs an alarm to alert the
other end that it needs to talk.

75v ac 16Hz will ring a phone.
3 relays are expensive?


NT
 
On Monday, February 16, 2015 at 9:01:14 AM UTC-5, Sparky wrote:
<snip>

We don't give answers to eternal-september trolls, we wee on them.
 
On Tue, 17 Feb 2015 07:39:16 -0700, Jim Thompson wrote:

On Tue, 17 Feb 2015 07:52:56 -0500, JW <none@dev.null> wrote:

On Mon, 16 Feb 2015 07:58:11 -0800 (PST)
bloggs.fredbloggs.fred@gmail.com wrote in Message id:
2040a791-a582-4030-ad2e-e781bb89bd2a@googlegroups.com>:

On Monday, February 16, 2015 at 9:01:14 AM UTC-5, Sparky wrote: <snip

We don't give answers to eternal-september trolls, we wee on them.

Sez the Google Groper! Haw!!!

"Wee" is bloggs' skill level >:-}

...Jim Thompson

That is his wee wittle bwain. That is all has has to offer.
 
On Tuesday, February 17, 2015 at 9:39:25 AM UTC-5, Jim Thompson wrote:
On Tue, 17 Feb 2015 07:52:56 -0500, JW <none@dev.null> wrote:

On Mon, 16 Feb 2015 07:58:11 -0800 (PST) bloggs.fredbloggs.fred@gmail.com
wrote in Message id:
2040a791-a582-4030-ad2e-e781bb89bd2a@googlegroups.com>:

On Monday, February 16, 2015 at 9:01:14 AM UTC-5, Sparky wrote:
snip

We don't give answers to eternal-september trolls, we wee on them.

Sez the Google Groper! Haw!!!

"Wee" is bloggs' skill level >:-}

wee weer weest

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
On Mon, 16 Feb 2015 07:58:11 -0800 (PST) bloggs.fredbloggs.fred@gmail.com
wrote in Message id:
<2040a791-a582-4030-ad2e-e781bb89bd2a@googlegroups.com>:

On Monday, February 16, 2015 at 9:01:14 AM UTC-5, Sparky wrote:
snip

We don't give answers to eternal-september trolls, we wee on them.

Sez the Google Groper! Haw!!!
 
On Tuesday, February 17, 2015 at 9:43:10 AM UTC-5, DecadentLinuxUserNumeroUno wrote:
On Tue, 17 Feb 2015 07:39:16 -0700, Jim Thompson wrote:

On Tue, 17 Feb 2015 07:52:56 -0500, JW <none@dev.null> wrote:

On Mon, 16 Feb 2015 07:58:11 -0800 (PST)
bloggs.fredbloggs.fred@gmail.com wrote in Message id:
2040a791-a582-4030-ad2e-e781bb89bd2a@googlegroups.com>:

On Monday, February 16, 2015 at 9:01:14 AM UTC-5, Sparky wrote: <snip

We don't give answers to eternal-september trolls, we wee on them.

Sez the Google Groper! Haw!!!

"Wee" is bloggs' skill level >:-}

...Jim Thompson

That is his wee wittle bwain. That is all has has to offer.

The best thing for you would be a one way trip to Mars, but the only way to get there at the moment disqualifies people like you on so many counts it's hopeless.
http://www.mars-one.com/faq/selection-and-preparation-of-the-astronauts/what-are-the-qualifications-to-apply
 
On Tue, 17 Feb 2015 07:52:56 -0500, JW <none@dev.null> wrote:

On Mon, 16 Feb 2015 07:58:11 -0800 (PST) bloggs.fredbloggs.fred@gmail.com
wrote in Message id:
2040a791-a582-4030-ad2e-e781bb89bd2a@googlegroups.com>:

On Monday, February 16, 2015 at 9:01:14 AM UTC-5, Sparky wrote:
snip

We don't give answers to eternal-september trolls, we wee on them.

Sez the Google Groper! Haw!!!

"Wee" is bloggs' skill level >:-}

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Jan Panteltje wrote:
Ordered one some time ago,
arrived, actually works,
have not figured out how to use the menus yet:
http://www.ebay.com/itm/121457832961

It seems pressing things in differerent ways,
just as you are about to give up
it suddenly finds all mp3s in all directories...

For less than 5 $ with free shipping....


So, Lipo, USB connector, METAL housing, LCD, power switch,
some chip, and SMDs I am sure,
but there is also a hole maked 'mic' so can it record?

Oh, plus free USB cable.


Somebody is making these things in quantity....
Anybody here design it ;-) ? Need a manual!

I bought a closely similar one for my youngest son when we
prowled the electronic parts market in Delhi last year. It's
Chinese. I paid the equivalent of about $3 for it.

On that outing, I also bought several local (Indian) products
just because I marvelled at how cheaply they could make them.
Example: An emergency light with four 8mm 'straw hat' LEDs, a
Nokia BL-5C battery (counterfeit of couse), a charging port,
charging indicator LED and an on/off rocker switch, all housed in
a crude plastic box. Got that for $0.30 and was offered 3 for
$0.70. A compact power extension box with one 3-pin socket, four
2-pin sockets and a 5-foot cord for $0.25. Again the box is so
crudely made that I kinda love it.

I don't think you'll be allowed to sell those in western
countries. Sometimes it's nice to be a little backward.
 
On a sunny day (Thu, 19 Feb 2015 13:52:31 GMT) it happened Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote in <mc4pqt$rvh$1@news.albasani.net>:

Ordered one some time ago,
arrived, actually works,
have not figured out how to use the menus yet:
http://www.ebay.com/itm/121457832961

It seems pressing things in differerent ways,
just as you are about to give up
it suddenly finds all mp3s in all directories...

For less than 5 $ with free shipping....


So, Lipo, USB connector, METAL housing, LCD, power switch,
some chip, and SMDs I am sure,
but there is also a hole maked 'mic' so can it record?

Oh, plus free USB cable.


Somebody is making these things in quantity....
Anybody here design it ;-) ? Need a manual!

Anyays, decided to open it up.
There is no mike behind the hole marked 'mic'.
The chip is a narrow DIL with few pins marked STA801.
A websearch for STA801 confirms that that is NOT this chip.
The board is marked Y02-DS801-V2
No find either but there exists a similar DS801 mp3 player.
The chip date is week 39 2014, so maybe too recent...
The other thing on the chip says MQGX269.1 (no find either).

Interesting it becomes when we read on an OTHER sellers site:
http://www.ebay.com/itm/141494972971
Quote:
"Built-in Li-ion battery, directly connect with PC for re-charging
Note:Do not charge more than two hours, or it easily create MP3 Built-in lithium battery failure and damage
"

It does not specify if the damage will be to the battery, the unit, or your house or city,

So that explains the price I guess!

But I have a green one, so...

I am now charging, need to remember to watch that clock.
Dunno how much was in it when started...

;-)
 
I wrote:

Interesting it becomes when we read on an OTHER sellers site:
http://www.ebay.com/itm/141494972971
Quote:
"Built-in Li-ion battery, directly connect with PC for re-charging
Note:Do not charge more than two hours, or it easily create MP3 Built-in lithium battery failure and damage
"

It does not specify if the damage will be to the battery, the unit, or your house or city,

So that explains the price I guess!

But I have a green one, so...

I am now charging, need to remember to watch that clock.
Dunno how much was in it when started...

;-)

So.. I charged the battery for > 3 hours, in the beginning it was a bit warm,
but before and after that I never got more than 1 hours 10 minutes play time
out of it, with no load (into a high impedance amplifier input).

No bangs or booms or fire.
But not the promised (on some sites) 3 hours playtime either.

There is an other model like it witout LCD where they promise 4 hours play time,
that one is < 2 dollars:
http://www.ebay.com/itm/251704364713

I ordered some :) 3$58 for two, inclusive shipping.
will make a DC jack on it.
 
On Saturday, February 21, 2015 at 7:25:27 AM UTC-5, Jan Panteltje wrote:
This is the follow up,
I REALLY like to get to the bottom of things.
Now THIS is well, you name it,.

Could not resist opening it again, take some pictures,
and especially measure battery voltage and current,
both in play and in charge.

http://panteltje.com/pub/5_dollar_mp3_player_PCB_front_IMG_4725.JPG

In play it consumes about 17 mA, yes on a 90 mAh lipo that should give
4 hours...

But, after 3 hours charging battery was not full (as indicated by battery symbol,
and short play time, and now with digital voltmeter: 3.9 V
(4.2 and a lipo is full)..

So, I had a suspicion, it came with the thinnest USB cable I have ever seen.
http://panteltje.com/pub/Chinese_USB_cable_sizes_IMG_4728.JPG

So measured the charging current (meter in series with battery all the time).
4 mA!!! Well that will take years to get full.

Changed the USB cable for a slightly thicker other Chinese one.
12 mA.

OK, now I had 2 USB cables in series all the time (extention from PC),
so plugged the thicker cable in the PC directly:
20 mA


So the Chinese count on the resistance of the supplied USB cable to limit the charging current.
mm :)

The cable from my Canon camera gives 22.4 mA charge current, getting better.

Connected a 5V Raspberry power supply:
31.4 mA

Now that should give about 3 to 4 hours charging time, but but, is there any regulator????

Maybe stick the batteries in a metal box while charging.
(Blast and fire protection)

George H.
The LCD back light itself uses about 3 mA (set to maximum contrast, should be 'brightness' actually).

Other side PCB, battery mounted with double sided tape, as is the LCD.
http://panteltje.com/pub/5_dollar_mp3_player_PCB_back_IMG_4739.JPG

This is the only chip I can see:
http://panteltje.com/pub/5_dollar_mp3_player_chip_IMG_4732.JPG

But there must a LCD controller between layers of sticky tape on the LCD,
but too tricky to remove that, as it may tare up the thin flex PCB cable.

Now charging from Raspi power supply with Cannon USB cable.

Wheels of fire, rolling down the road,
you know that we will meet again...
if you FLASH memory serves you well,
or something like that,

DISCLAIMER
DO Not trY tHiS aT hOme
 
On Sat, 21 Feb 2015 06:35:47 -0800, George Herold wrote:

Now that should give about 3 to 4 hours charging time, but but, is
there any regulator????

If there is a charge indicator on the LCD there is a charge monitoring
circuit. Period.
 
This is the follow up,
I REALLY like to get to the bottom of things.
Now THIS is well, you name it,.

Could not resist opening it again, take some pictures,
and especially measure battery voltage and current,
both in play and in charge.

http://panteltje.com/pub/5_dollar_mp3_player_PCB_front_IMG_4725.JPG

In play it consumes about 17 mA, yes on a 90 mAh lipo that should give
4 hours...

But, after 3 hours charging battery was not full (as indicated by battery symbol,
and short play time, and now with digital voltmeter: 3.9 V
(4.2 and a lipo is full)..

So, I had a suspicion, it came with the thinnest USB cable I have ever seen.
http://panteltje.com/pub/Chinese_USB_cable_sizes_IMG_4728.JPG

So measured the charging current (meter in series with battery all the time).
4 mA!!! Well that will take years to get full.

Changed the USB cable for a slightly thicker other Chinese one.
12 mA.

OK, now I had 2 USB cables in series all the time (extention from PC),
so plugged the thicker cable in the PC directly:
20 mA


So the Chinese count on the resistance of the supplied USB cable to limit the charging current.
mm :)

The cable from my Canon camera gives 22.4 mA charge current, getting better.

Connected a 5V Raspberry power supply:
31.4 mA

Now that should give about 3 to 4 hours charging time, but but, is there any regulator????

The LCD back light itself uses about 3 mA (set to maximum contrast, should be 'brightness' actually).

Other side PCB, battery mounted with double sided tape, as is the LCD.
http://panteltje.com/pub/5_dollar_mp3_player_PCB_back_IMG_4739.JPG

This is the only chip I can see:
http://panteltje.com/pub/5_dollar_mp3_player_chip_IMG_4732.JPG

But there must a LCD controller between layers of sticky tape on the LCD,
but too tricky to remove that, as it may tare up the thin flex PCB cable.

Now charging from Raspi power supply with Cannon USB cable.

Wheels of fire, rolling down the road,
you know that we will meet again...
if you FLASH memory serves you well,
or something like that,

DISCLAIMER
DO Not trY tHiS aT hOme
 
On a sunny day (Sat, 21 Feb 2015 06:35:47 -0800 (PST)) it happened George
Herold <gherold@teachspin.com> wrote in
<529cac95-7ad3-437b-8c61-b5cf08e8a5a4@googlegroups.com>:

Maybe stick the batteries in a metal box while charging.
(Blast and fire protection)

Pussies..... :)
I stopped charging, it is full now,
lipo measures 4.3 V!!
And current went down to about 5 mA.
It is running now to see how long it plays...

To be fair, these very small batteries do not bother me at all.

But the big ones in my model airplane I treat with great care...
11.1 V / 2200 mAh
 
Jan Panteltje wrote:
On a sunny day (Sat, 21 Feb 2015 06:35:47 -0800 (PST)) it
happened
George Herold <gherold@teachspin.com> wrote in
529cac95-7ad3-437b-8c61-b5cf08e8a5a4@googlegroups.com>:

Maybe stick the batteries in a metal box while charging.
(Blast and fire protection)

Pussies..... :)
I stopped charging, it is full now,
lipo measures 4.3 V!!
And current went down to about 5 mA.
It is running now to see how long it plays...

To be fair, these very small batteries do not bother me at all.

But the big ones in my model airplane I treat with great
care...
11.1 V / 2200 mAh

Aha, you've caught the bug too. I mean the bug that causes one to
enjoy trying to extract some worthwhile performance from
something (as distinct from barely making it go) after most
others would have dismissed it as useless crap. It often goes
beyond ordinary tinkering.
 
On a sunny day (Sat, 21 Feb 2015 23:39:51 +0530) it happened "Pimpom"
<Pimpom@invalid.invalid> wrote in <mcahlb$rk3$1@news.albasani.net>:

Jan Panteltje wrote:
On a sunny day (Sat, 21 Feb 2015 06:35:47 -0800 (PST)) it
happened
George Herold <gherold@teachspin.com> wrote in
529cac95-7ad3-437b-8c61-b5cf08e8a5a4@googlegroups.com>:

Maybe stick the batteries in a metal box while charging.
(Blast and fire protection)

Pussies..... :)
I stopped charging, it is full now,
lipo measures 4.3 V!!
And current went down to about 5 mA.
It is running now to see how long it plays...

To be fair, these very small batteries do not bother me at all.

But the big ones in my model airplane I treat with great
care...
11.1 V / 2200 mAh

Aha, you've caught the bug too. I mean the bug that causes one to
enjoy trying to extract some worthwhile performance from
something (as distinct from barely making it go) after most
others would have dismissed it as useless crap. It often goes
beyond ordinary tinkering.

Its still playing (into the big amp, practically no load, several kOhm)
Started at 15:48 (CET),
it is now 19:25 (CET)
Chances are I get 4 hours this way :)

Of course with big headphones of < 30 Ohms
then 3 hours would be cool if it makes it.


It is a nice player so far,
sound is good, and it found all those mp3.
Amazing, these are spread over many directories,
it is the 16 GB card from my Android,
the counter on that little display shows 304 mp3 songs
(some are long like 50 minutes),
bit rates differ, I am curious as to the one where I concatenated (with Linux mpgedit)
several pieces into a 2.5 hour long music only mp3,
where some of the pieces have different bitrates.
Samsung chip gets confused and plays some pieces at double speed,
Creative labs MUVO100 plays it OK, wonder if this chip will do it.

Worth every cent.
 
I wrote:

I am curious as to the one where I concatenated (with Linux mpgedit)
several pieces into a 2.5 hour long music only mp3,
where some of the pieces have different bitrates.
Samsung chip gets confused and plays some pieces at double speed,
Creative labs MUVO100 plays it OK, wonder if this chip will do it.

Nope, plays those pieces at double speed, could be the Samsung chip!

I think the issue with that chip is that it only checks the _first_header in a mp3 stream,
and then keeps that as reference for the rest.
Of course it should process settings from any subsequent header.

But it _is_ a bit out of the ordinary, so I am not complaining.
But it was one of the reasons I wanted to try this one...

The Creative MUVO is falling apart, and that model is becoming strangely expensive on ebay, 189 $!!!
http://www.ebay.com/itm/281577570474
Not what I payed, was new about 30 or 40 Euro IIRC).
Will have to re-encode the mp3.
Not a big deal.

Playing >4 hours now....
 
Jan Panteltje wrote:


OK, now I had 2 USB cables in series all the time (extention from PC),
so plugged the thicker cable in the PC directly:
20 mA


So the Chinese count on the resistance of the supplied USB cable to limit
the charging current. mm :)

YIKES! Make sure your fire insurance is paid up!

Jon
 
On 21.02.2015 13:25, Jan Panteltje wrote:
So measured the charging current (meter in series with battery all
the time). 4 mA!!! Well that will take years to get full.

Changed the USB cable for a slightly thicker other Chinese one. 12
mA.

OK, now I had 2 USB cables in series all the time (extention from
PC), so plugged the thicker cable in the PC directly: 20 mA


So the Chinese count on the resistance of the supplied USB cable to
limit the charging current. mm :)
....


Yup. The apparently "classic" USB LiPo charging circuit for portable
players, toys and similar "mass market" goods is a (silicon) diode with
a 10 Ohm (SMD 1206 size) resistor in series. Some devices also have a
comparator in SOT23-5 case driving a charge indicator LED.

5 V - 0.7 V conveniently happens to be "close enough" to 4.2 V, the
upper limit charge voltage for a LiPo cell, and the resistor limits the
current into a discharged cell. There's no other regulation, limiting or
shutdown. The comparator (if it's even there) only drives the LED (or
an MCU pin if the device has a display).

In your case, the cheesy cable and connectors probably had a significant
fraction of those 10 Ohms.

The battery itself may or may not have a protection chip. If it has one,
you may notice that because sometimes it will latch when left charging
too long any you'll have to leave it disconnected for a little before
the voltage drops below the threshold, the protection resets and the
thing starts working again.

As for safety, I'll leave that evaluation up to you. Particularly if you
happen to have an iSomething or other "USB" power supply (genuine or
not) that intentionally hits the upper limit of the USB allowed voltage
range and "does its best to accelerate charging" with a 5.2 V barely-
standard-compliant output.

Greetings
Dimitrij

P.S. I don't have the same type of mp3 player as you, so i don't know
for sure whether the circuit described above is indeed used there. It
seems to be common enough to be a "usual suspect" however ...
 
On a sunny day (Mon, 23 Feb 2015 00:06:19 +0100) it happened Dimitrij
Klingbeil <nospam@no-address.com> wrote in <mcdncc$6sv$1@dont-email.me>:

P.S. I don't have the same type of mp3 player as you, so i don't know
for sure whether the circuit described above is indeed used there. It
seems to be common enough to be a "usual suspect" however ...

Yup, in the picture you can see the diode,
http://panteltje.com/pub/5_dollar_mp3_player_PCB_back_IMG_4739.JPG
there is place for 2 diodes, only one is fitted,
and indeed it ended at 4.3 V... after a while.
The lipos with protecion have a chip visible through the plastic,
in this battery there is no such thing visible,
and there was stil 5 mA flowing at 4.3 V.

But I am happy with this player,
re-encoded my multi-bitrate mp3s yesterday, linux ffmpeg does it right!
Those now play OK too.
(A 7 hours mp3 imagine, never reaches the end).
Need to make some power adaptor.
 

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