sci.electronics.repair - 16 new messages in 7 topics - digest

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Today's topics:

* 3mm 1.5V bright LED - 7 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/9857700f8db1631a?hl=en
* Mixing 4 audio channels to 3? - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/a9c921002b2ed750?hl=en
* Asus N7600GS (red dots and lines) - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/f811f0a341e6e63e?hl=en
* issue with electret condenser mic - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/0f83e591aedae6bd?hl=en
* 3Ah NiMH AA-size battery problem? - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/e5df21713a2eae15?hl=en
* Sony BE3D Chassis LED flashes - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/cff9af107feb57eb?hl=en
* Using substitute Ink Cartridges in HP PSC 1315 - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/1fa991cf19d8a400?hl=en

==============================================================================
TOPIC: 3mm 1.5V bright LED
http://groups.google.com/group/sci.electronics.repair/t/9857700f8db1631a?hl=en
==============================================================================

== 1 of 7 ==
Date: Fri, Oct 28 2011 1:36 pm
From: "Ian Field"

"Man-wai Chang" <toylet.toylet@gmail.com> wrote in message
news:j8e0kr$ttb$1@dont-email.me...
>
> Is there such a toy?

Yes if you use a 1.5V blocking oscillator.

== 2 of 7 ==
Date: Sat, Oct 29 2011 1:16 am
From: "bw"

"Ian Field" <gangprobing.alien@ntlworld.com> wrote in message
news:zoEqq.6082$gS1.1219@newsfe17.ams2...
>
> "Man-wai Chang" <toylet.toylet@gmail.com> wrote in message
> news:j8e0kr$ttb$1@dont-email.me...
>>
>> Is there such a toy?
>
>
> Yes if you use a 1.5V blocking oscillator.

http://cappels.org/dproj/ledpage/leddrv.htm

== 3 of 7 ==
Date: Sat, Oct 29 2011 5:30 am
From: Man-wai Chang

>> Yes if you use a 1.5V blocking oscillator.
>
> http://cappels.org/dproj/ledpage/leddrv.htm

I want one that has the (over?) driver built into the LED... :)

--
@~@ You have the right to remain silence.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (Fedora 15 i686) Linux 3.0.4
^ ^ 13:36:02 up 11 days 17:42 0 users load average: 0.01 0.02 0.05
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

== 4 of 7 ==
Date: Sat, Oct 29 2011 8:44 am
From: "Ian Field"

"Man-wai Chang" <toylet.toylet@gmail.com> wrote in message
news:j8grkj$28m$1@dont-email.me...
>>> Yes if you use a 1.5V blocking oscillator.
>>
>> http://cappels.org/dproj/ledpage/leddrv.htm
>
> I want one that has the (over?) driver built into the LED... :)

Some time ago Elektor did a front cover freebie; a tiny PCB with a dedicated
LED drive chip and inductor for voltages down to 0.9V - that's probably as
small as it gets.

Can't remember details but if you google Elektor and click contact from
their home page, you can ask the editor.

== 5 of 7 ==
Date: Sat, Oct 29 2011 9:03 am
From: Spehro Pefhany

On Fri, 28 Oct 2011 18:37:15 +0800, the renowned Man-wai Chang
<toylet.toylet@gmail.com> wrote:

>
>Is there such a toy?

You could use this simple circuit to work down to <<1V --

FB = OUT for Red

FB = GND for Green/Blue/White
|
.----------.
Vin 0.8V minimum | FB |
10uH | |
___ | L6920 | LED
o----+---UUU----|LX OUT|----+->|---+
+ | | | | |
--- | | | |
--- | REF | | .-.
47uF | '----------' | | |
| | + | |
GND 100n --- --- '-'
--- 47uF --- |
| |
GND GND GND

All the parts can be tiny SMT components. Reduce the 47uF caps to 22uF
and use 0805 22uF/6.3V ceramics and an 0805 inductor to reduce size,
and the 100n can be an 0402.

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

== 6 of 7 ==
Date: Sat, Oct 29 2011 2:39 pm
From: "Ian Field"

http://www.elektor.com/magazines/2006/november/pr4401-led-driver.58609.lynkx

== 7 of 7 ==
Date: Sat, Oct 29 2011 4:50 pm
From: Spehro Pefhany

On Sat, 29 Oct 2011 22:39:27 +0100, the renowned "Ian Field"
<gangprobing.alien@ntlworld.com> wrote:

>
>"Man-wai Chang" <toylet.toylet@gmail.com> wrote in message
>news:j8grkj$28m$1@dont-email.me...
>>>> Yes if you use a 1.5V blocking oscillator.
>>>
>>> http://cappels.org/dproj/ledpage/leddrv.htm
>>
>> I want one that has the (over?) driver built into the LED... :)
>
>
>http://www.elektor.com/magazines/2006/november/pr4401-led-driver.58609.lynkx
>

Presumably this part?

http://www.prema.com/pdf/pr4401.pdf

==============================================================================
TOPIC: Mixing 4 audio channels to 3?
http://groups.google.com/group/sci.electronics.repair/t/a9c921002b2ed750?hl=en
==============================================================================

== 1 of 2 ==
Date: Sat, Oct 29 2011 12:49 am
From: DaveC

> 10 kohms for all fixed resistor should work...

Hi Tomi. Thank you for your advice. I have enjoyed your creative designs for
many years.

Do you have any comments on my revisions of the circuit (ie, are caps
recommended? should I be concerned about cross talk if I take resistors from
all 4 channels to drive the sub woofer? etc...)

Cheers,
Dave

== 2 of 2 ==
Date: Sat, Oct 29 2011 6:51 am
From: John Fields

On Sat, 29 Oct 2011 00:49:32 -0700, DaveC <invalid@invalid.net> wrote:

>> 10 kohms for all fixed resistor should work...
>
>Hi Tomi. Thank you for your advice. I have enjoyed your creative designs for
>many years.
>
>Do you have any comments on my revisions of the circuit (ie, are caps
>recommended? should I be concerned about cross talk if I take resistors from
>all 4 channels to drive the sub woofer? etc...)
>
>Cheers,
>Dave

---
Why not go active and get rid of the caps altogether?

.LA>-+---[10k]-+-[10k]-+-------------> -(LA+LB)
. | | |
. | | +V |
. | | | |
.LB>-|-+-[10k]-+--|-\ |
. | | | >-+ 10K
. | | +--|+/ +-[POT]-+
. | | | | | |
. | | GND -V | +5 |
. | | | | |
. | +------[10K]---+---+-|-\ |
. | | | >--+--> -(LA+LB+RA+RB)
. +--------[10K]---+ +-|+/
. | |
. +--------[10K]---+ GND
. | |
. | +------[10K]---+
. | |
. | |
. | |
.RA>-+-+-[10k]-+-[10k]-+
. | | |
. | | +V |
. | | | |
.RB>-+---[10k]-+--|-\ |
. | >-+-------------> -(RA+RB)
. +--|+/
. | |
. GND -V

Seems to work pretty well...

Version 4
SHEET 1 880 968
WIRE 112 -544 48 -544
WIRE 224 -544 192 -544
WIRE -96 -448 -528 -448
WIRE 32 -448 -16 -448
WIRE 48 -448 48 -544
WIRE 48 -448 32 -448
WIRE 112 -448 48 -448
WIRE 224 -432 224 -544
WIRE 224 -432 176 -432
WIRE 256 -432 224 -432
WIRE 112 -416 80 -416
WIRE -96 -352 -432 -352
WIRE 32 -352 32 -448
WIRE 32 -352 -16 -352
WIRE 80 -352 80 -416
WIRE -528 -240 -528 -448
WIRE -416 -240 -528 -240
WIRE 64 -240 -336 -240
WIRE 112 -240 64 -240
WIRE 240 -240 192 -240
WIRE -432 -192 -432 -352
WIRE -352 -192 -432 -192
WIRE 64 -192 64 -240
WIRE 64 -192 -272 -192
WIRE -272 -144 -336 -144
WIRE 64 -144 64 -192
WIRE 64 -144 -192 -144
WIRE -176 -96 -240 -96
WIRE 64 -96 64 -144
WIRE 64 -96 -96 -96
WIRE 128 -96 64 -96
WIRE 240 -80 240 -240
WIRE 240 -80 192 -80
WIRE 272 -80 240 -80
WIRE 128 -64 96 -64
WIRE 96 0 96 -64
WIRE 112 112 48 112
WIRE 224 112 192 112
WIRE -336 208 -336 -144
WIRE -96 208 -336 208
WIRE 32 208 -16 208
WIRE 48 208 48 112
WIRE 48 208 32 208
WIRE 112 208 48 208
WIRE 224 224 224 112
WIRE 224 224 176 224
WIRE 256 224 224 224
WIRE 112 240 80 240
WIRE -240 304 -240 -96
WIRE -96 304 -240 304
WIRE 32 304 32 208
WIRE 32 304 -16 304
WIRE 80 304 80 240
WIRE -528 688 -528 -240
WIRE -432 688 -432 -192
WIRE -336 688 -336 208
WIRE -240 688 -240 304
WIRE -144 688 -144 656
WIRE -48 688 -48 656
WIRE -528 832 -528 768
WIRE -432 832 -432 768
WIRE -432 832 -528 832
WIRE -336 832 -336 768
WIRE -336 832 -432 832
WIRE -240 832 -240 768
WIRE -240 832 -336 832
WIRE -144 832 -144 768
WIRE -144 832 -240 832
WIRE -48 832 -48 768
WIRE -48 832 -144 832
WIRE -528 928 -528 832
FLAG 144 192 +5
FLAG 144 256 -5
FLAG 80 304 0
FLAG 144 -464 +5
FLAG 144 -400 -5
FLAG 80 -352 0
FLAG -528 928 0
FLAG -144 656 +5
FLAG -48 656 -5
FLAG 160 -112 +5
FLAG 160 -48 -5
FLAG 96 0 0
SYMBOL Opamps\\LT1007 144 160 R0
SYMATTR InstName U1
SYMBOL voltage -240 672 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(0 1 1000)
SYMBOL res 0 192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 0 288 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL res 208 96 R90
WINDOW 0 -43 58 VBottom 2
WINDOW 3 -37 60 VTop 2
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL Opamps\\LT1007 144 -496 R0
SYMATTR InstName U2
SYMBOL res 0 -464 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL res 0 -368 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL res 208 -560 R90
WINDOW 0 -43 58 VBottom 2
WINDOW 3 -37 60 VTop 2
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL voltage -48 784 R180
WINDOW 0 -50 102 Left 2
WINDOW 3 24 16 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage -144 672 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL res -80 -112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res -176 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 10k
SYMBOL res -256 -208 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 10k
SYMBOL res -320 -256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R10
SYMATTR Value 10k
SYMBOL Opamps\\LT1007 160 -144 R0
SYMATTR InstName U3
SYMBOL res 208 -256 R90
WINDOW 0 -43 58 VBottom 2
WINDOW 3 -37 60 VTop 2
SYMATTR InstName R12
SYMATTR Value 5k
SYMBOL voltage -336 672 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value SINE(0 1 1700)
SYMBOL voltage -432 672 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V5
SYMATTR Value SINE(0 1 2300)
SYMBOL voltage -528 672 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V6
SYMATTR Value SINE(0 1 4260)
TEXT -562 952 Left 2 !.tran .005

--
JF

==============================================================================
TOPIC: Asus N7600GS (red dots and lines)
http://groups.google.com/group/sci.electronics.repair/t/f811f0a341e6e63e?hl=en
==============================================================================

== 1 of 2 ==
Date: Sat, Oct 29 2011 12:56 am
From: Franc Zabkar

On Fri, 28 Oct 2011 07:45:52 -0700 (PDT), Jack00 <SPal508596@aol.com>
put finger to keyboard and composed:

>I did check the capacitors and some were high with a capacitor meter
>so I replaced them and the card worked for a few days but the symptoms
>returned again. The power supply voltages going to the card seem
>normal. Are there any tests I can do on the card?

I suspect that the card manufacturers would have their own
diagnostics, but I haven't seen anything like this on the Internet. I
don't know what you could do except to narrow down the fault with a
hair dryer and spray freezer. I would also choose the lowest possible
refresh rate in the properties for your card.

The only other thing I can think of, if you really are desperate to
save this card, would be to reduce its capacity from 256MB to 128MB,
assuming of course that yours is the former.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

== 2 of 2 ==
Date: Sat, Oct 29 2011 1:44 am
From: "N_Cook"

Franc Zabkar <fzabkar@iinternode.on.net> wrote in message
news:s59na75ctqokic2hmerudc80h5j065olbe@4ax.com...
> On Fri, 28 Oct 2011 07:45:52 -0700 (PDT), Jack00 <SPal508596@aol.com>
> put finger to keyboard and composed:
>
> >I did check the capacitors and some were high with a capacitor meter
> >so I replaced them and the card worked for a few days but the symptoms
> >returned again. The power supply voltages going to the card seem
> >normal. Are there any tests I can do on the card?
>
> I suspect that the card manufacturers would have their own
> diagnostics, but I haven't seen anything like this on the Internet. I
> don't know what you could do except to narrow down the fault with a
> hair dryer and spray freezer. I would also choose the lowest possible
> refresh rate in the properties for your card.
>
> The only other thing I can think of, if you really are desperate to
> save this card, would be to reduce its capacity from 256MB to 128MB,
> assuming of course that yours is the former.
>
> - Franc Zabkar
> --
> Please remove one 'i' from my address when replying by email.

A last resort might be trying insulated jaw soft clamp over , in sequence,
some of the chippery in case of poor SMD/BGA solder somewhere. If that
improves things then maybe some sort of dedicated clamp , assuming
resoldering is out of the question

==============================================================================
TOPIC: issue with electret condenser mic
http://groups.google.com/group/sci.electronics.repair/t/0f83e591aedae6bd?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Oct 29 2011 7:15 am
From: "William Sommerwerck"

I'd go with Michael's suggestion. Put a 'scope on the B+ to the mics (in all
the devices), and see if there are any disturbances. It's certainly a
reasonable place to start.

==============================================================================
TOPIC: 3Ah NiMH AA-size battery problem?
http://groups.google.com/group/sci.electronics.repair/t/e5df21713a2eae15?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Oct 29 2011 9:19 am
From: "hrhofmann@att.net"

On Oct 27, 4:25 am, "N_Cook" <dive...@tcp.co.uk> wrote:
> High performance so not thrown away lightly
> No difference in observed powering performance to its mate bought at the
> same time. Same DVM loaded battery test after both are charged. Orange MP
> make if relevant. One has had for some time , ignored as a scuff mark to the
> orange plastic and apparently showing aluminium case under, a hole in the
> case. About 2 x 1 mm looks like a melted oval rim of aluminium with central
> area of dusty grey ceramic looking material. But the surrounding orange
> heatshrink is not melted , looks a neat junction between oval "cut" plastic
> and melted aluminium which makes no sense. What is this hole? prognosis?
> paliative measures to be taken ? dangerous chemically or flammability ?

just throw it out

==============================================================================
TOPIC: Sony BE3D Chassis LED flashes
http://groups.google.com/group/sci.electronics.repair/t/cff9af107feb57eb?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Oct 29 2011 2:03 pm
From: Jack00

The standby LED flashes on this TV set continuously.

==============================================================================
TOPIC: Using substitute Ink Cartridges in HP PSC 1315
http://groups.google.com/group/sci.electronics.repair/t/1fa991cf19d8a400?hl=en
==============================================================================

== 1 of 2 ==
Date: Sat, Oct 29 2011 8:29 pm
From: "hrhofmann@att.net"

I have a HP PSC 1315 printer, scanner, copier. The instruction manual
and the printer itself say to use 27 or 56 black, and 28 or 57 color
cartridges. I have a couple of 21 black and one 22 color cartridges
that are unopened. The pins and physical mounting appear to be
identical to the newer cartridges. I know that I can just put the
cartridges in and see what happens, but does anyone know for sure if
these older cartridges can definitely be used?

== 2 of 2 ==
Date: Sat, Oct 29 2011 10:00 pm
From: Jeff Liebermann

On Sat, 29 Oct 2011 20:29:53 -0700 (PDT), "hrhofmann@att.net"
<hrhofmann@att.net> wrote:

>I have a HP PSC 1315 printer, scanner, copier. The instruction manual
>and the printer itself say to use 27 or 56 black, and 28 or 57 color
>cartridges. I have a couple of 21 black and one 22 color cartridges
>that are unopened. The pins and physical mounting appear to be
>identical to the newer cartridges. I know that I can just put the
>cartridges in and see what happens, but does anyone know for sure if
>these older cartridges can definitely be used?

The carts have chips inside that will complain that you have the wrong
cart. I have the identical printer in the office but have not tried
swapping carts. When I tried it with other printers and almost
interchangable ink and toner carts, it usually fails.

I suggest you look into refilling the carts. I've had really good
luck with refilling black ink carts and almost no luck with the color
carts. Bulk black ink is cheap at 1000ml for about $30. At 10ml ink
for the HP27 cart, that's 100 refills.

Since my customers that have such printers don't do much color
printing, I set their printer driver to print everything in black and
white. The almost empty color cart just sits in the printer doing
nothing. When possible, I try to sell them on a laser printer
replacement (HP LJ2300dn this week) and using the AOI inkjet printer
as a small scanner.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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sci.electronics.repair - 16 new messages in 7 topics - digest

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