audio recording on IC -help wanted

[John Larkin]

On Tue, 04 Mar 2008 13:33:38 -0800, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

John Larkin wrote:
On Tue, 04 Mar 2008 09:05:14 -0800, Joerg
notthisjoergsch@removethispacbell.net> wrote:

John Larkin recently pointed out the NE3508 and NE3509. They are really
nice, steep Vgs versus Id and so on. Even better than the BF862 except
for one major obstacle: At >>50c they are way out of league for many
designs. High drool factor, followed by a depressed look at the BOM budget.

Question: Are there similar hotrod JFETs that are in the 10-20c range?

The BF862 is a rusty old tractor compared to the NEC hj parts. The
hjfets have roughly 10 times the transconductance and 10 times less
capacitance than the jfet, which is a 100:1 gain-bandwidth advantage.
The Rds-on ratio is, like, 20:1.

Also, in my experience, the hj fets are much more repeatable than
jfets. The Idss of the 862 is spec'd at 10-25 mA, which is actually
good for a jfet. Spec-sheet ranges of Idss are 10:1 for some jfets!

In my business, fast time-domain stuff, we don't use jfets. Their
poorly specified dc characteristics, and their low gain, make them
pretty much useless, especially since I can buy 1.8 GHz opamps and 10
GHz mmics nowadays.


I was thinking more about oscillators that must work with really low
supply voltage, a few hundred millivolts. The high gain of the NEC parts
is really beneficial there while the speed would have to be muffled big
time so they remain stable. Pricing is a serious problem though.

Jfets are good for HF front-ends and for oscillators, ald for
high-impedance instrumentation. The hj fets are noisy at low
frequencies, especially gate current noise. I don't know if they have
the "dispersion" problem that mesfets typically have, namely changes
in Gm at sub-MHz frequencies, or if they have the trapping-state
problems that mesfets have.

I'm trying to do a "pin driver" that will swing from 0.25 to 5 volts
p-p, with +-5 volt programmable offset, and produce an arguably square
wave from dc to 1 GHz. This isn't a very cost-sensitive application.

John

 

[JosephKK]

On Tue, 04 Mar 2008 00:10:39 -0800, UltimatePatriot
<UltimatePatriot@thebestcountry.org> wrote:

On Tue, 04 Mar 2008 05:59:03 GMT, JosephKK <quiettechblue@yahoo.com
wrote:

On Sun, 02 Mar 2008 22:50:22 -0800, UltimatePatriot
UltimatePatriot@thebestcountry.org> wrote:

On Sun, 02 Mar 2008 21:10:22 -0800, JosephKK <quiettechblue@yahoo.com
wrote:

On Sun, 02 Mar 2008 20:18:41 -0500, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:

JeffM wrote:

JosephKK (IDENTITY FRAUD) wrote:
[more mindless spew]

(The real) JosephKK wrote:
i noticed you gave up on forging JT real promptly.
I might ask him how he did that.

1) Look at the headers and get the abuse address.
2) Report him.
(I already did, but the piece of shit that runs that domain
says *you* have to make the complaint
--as will **each** individual whose identity this creep forges.)
The PoS administrator won't block the IP address.


Yet he claims to run a clean and honest service.

He probably believes that he does, but just not realize just how
easily it is abused.


Bullshit. The retarded bastard reads their posts. He knows what they
pull.

Gosh dimbulb you need to provide extraordinary support for that
extraordinary claim.

No, I do not, JoeyKKTard. He examines the post cited in the complaint,
and then responds. Pretty simple shit, you retarded fuck.

How strange. The owner has _NOT_ responded to me, but I do not seem
to be getting forged any more. The owner does not read all the
outgoing posts, only the ones contained in well built complaints.
There is a difference in timing and intent.

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:46819295.A1808F71@hotmail.com:

I disagree totally. Furthermore an incandescent lamp adds heat at
ceiling level usually where it is useless for warming a room.

Mostly radiant, so with reflectors, or high efficiency white
reflective surfaces, a lot of it can be reflected down. What little goes
upwards might help (minimally) to reduce heating requirements for people in
rooms above.

LED lamps are currently hugely expensive and the light they create is
even wierder than CFLs. No, CFLs do fine at this.

That's true, about LED light, but that's exactly what will make it
attractive to many. What's also vital is that good colour rendering can be
had with RGB that is much easier to filter out, which should please the
astronomers, as well as those who need more efficient whitelight sources.
CFL's on the other hand, have a light quality that is far harder to control
than LED's and LED's in the end will be more appealing, easy to dim,
therfore easy to get different colours immediately on demand in a way that
no previous tech has allowed. They will become enormously popular.

I happen to disagree with simply 'banning incandescent bulbs' but
that's more from a libertarian perspective than anything else.

Banning incandescents totally would also have the effect of banning
modern high efficiency halogens too, some of which currently can be
twice as efficient as standard tungsten incandescents and both Philips
and GE have plans to improve this figure further still.

Agreed, I think that it is a technology that will always find uses, and
banning it before it's reached the best possible development would be daft.
Anyway, as most lamps have special characteristics that are suited to
certain tasks, industrial process use won't be banned, I think. It's the
general long-term human environmental lighting that really needs to be
thought through because the bulk consumption is there.

The main thing is that govt reactions with no engineering thought behind
them need to be stopped, and I hope that some of the smarter politicos read
Usenet threads like this one. They could save SO much time, as they're up
to date, filled with various opinions and facts, and if govt wants to find
people who discuss this stuff they should go where they can find it
naturally occuring, instead of listening to pundits with private agendas
whispering in their ears, or just going for a big media news-story to steer
their course by.

 

[Pieter]

On Fri, 02 Nov 2007 14:34:07 -0700, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

Pieter wrote:
On Fri, 02 Nov 2007 13:28:59 -0700, Joerg
notthisjoergsch@removethispacbell.net> wrote:

snip-a-lot
I will check the BF862 datasheet.
Got to go through Digikey because NXP's web site current can't find it
via the search box.
I never understood your rants about philips/nxp website. It's not that
bad.
It is bad and I'm definitely not the only one saying that. Old saying
here in the US: A product is only as good as potential customers think
it is.

I had the same problem. Google helped and found it on the website.
Notice that the datahseet still says "Philips".

Just plug BF862 in the top right search box and it comes out immediately.
Well, today it does, maybe somebody reads these posts ;-)
Yesterday it clearly did not, and I've tried multiple times. So has Uwe
Bonnes here in this thread. That NXP site isn't reliable IMHO.

So a temporary problem.


Things is, they've got a lot of those. And some not so temporary ones.

For example, right now when I go onto their homepage the whole center is
blank. I cannot get into product categories anymore. Brand new Firefox
browser, so that's not the issue. Not good.


My problem lies mostly in the 0-10Hz range, parts do get get specified
there.
Unfortunatley many parts such as the BF862 aren't spec'd for noise down
there.
You can have a grasp of what it does by looking at the BF861 fig. 14
Not the best for low frequency.
From the NF figure in the table the parts seemt o be much different
though. But yes, the trend down there does not look good at all.

Hi,

It works over here. So I checked their code. I think it is a bad idea
to make code system dependent. This is a part of NXP system detection
(I changed formatting so I could read it), it checks for M$, opera,
mac:

var bCompatible = false;
if ( document.all
&& !navigator.userAgent.toLowerCase().match(/opera/)
&& !navigator.appVersion.match(/mac/i) )
{ try { bCompatible =
true && new ActiveXObject('Microsoft.XMLHTTP');
}
catch(e){}
}
else { bCompatible =
window.controllers
&& (parseInt(navigator.productSub)>20031001)
&& new XMLHttpRequest();
}
if (!bCompatible)
{ location.href = "/indexnc.html"; //INDEX Non Compatible
}

I wonder what system the developer tests it on? Computersystems that
are protected may not give out enough browser information. Do you use
firewll, anonymizer, privacy protector etc?

Pieter

 

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[Floyd L. Davidson]

"Phil McKerracher" <usenet@mckerracher.net> wrote:

"Floyd L. Davidson" <floyd@apaflo.com> wrote in message
news:87tz873zg4.fld@apaflo.com...
"Phil McKerracher" <usenet@mckerracher.net> wrote:

I've checked both of [V.32 and V.34] and they only
talk about carrier frequencies,
which is not at all the same thing as "what will work over a minimally
specified PSTN connection" in Alaska...

That is indeed *exactly* what the Standard defines.

No, that's your inference and I believe it to be incorrect
(internationally).

You claim the v.32 and v.34 standards only talk about
carrier frequencies, and that is clearly incorrect.

You didn't even see the 400-2800 Hz bandwidth defined in
the V.34 standard, so how likely are you to realize what
the significance of these standards are?

I'm looking for an international standard that defines
the PSTN bandwidth to be something other than 300-3400 Hz.

You haven't shown where the PSTN is defined as 300-3400
Hz, but have shown where a *digital* telephone (as
opposed to an analog set) should have +2 to -7 dB
response over 300-3400 Hz (and is expected to have 3 dB
rolloff at about 400-2800 Hz).

And the v.34 specification clearly defines the PSTN as
2400 Hz bandwidth, minimum.

You might note also that G.726, which describes ADPCM
states straight out that v.34 modems will not function,
but that modem standards using less than 2400 symbols
per second will work. As I've noted, the PSTN may have
a target of 400-2800 Hz, but there is no guarantee that
it will be even that. It absolutely is NOT defined at
anything near 300-3400 Hz!

--
Floyd L. Davidson <http://www.apaflo.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) floyd@apaflo.com

 

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[Terry Given]

MR COFFEE wrote:

Thanks for all the replies.

Terry wrote:

what you need to do is a "splat test"

charge up a known, large cap to some voltage V, then "splat" it across
onw winding (other open-cct) and measure current (eg 0.1R resistor off
to scope).


Do I assume correctly that the resistor goes across one of the
secondaries in the "splat test"?

yes. unless you happen to have a current probe (most people dont).

you will the current slope (dI/dt) gives you V/L, and if the
cap is large (c.f. energy in choke) then V is pretty much constant so
you can work out L. you can also see the core saturate (slopes upward, L
decreases), which will tell you how many Volt-Seconds the core can
handle (with that many turns), which then tells you what pulse width it
can cope with - you know the volts the driver cct will apply.

trifilar wound produces lowest leakeage, so best pulse shapes. if
leakage is too high, primary saturates before 2ndary goes very far.

Cheers
Terry


I will use some kynar ww wire for stronger insulation as suggested. I
will also put a resistor in series with the primary - good suggestion.

BTW - I tried searching both digikey and mouser for a SS relay that
would handle the amps - no dice. I know I've seen them surplus from
time to time but iirc they were pretty pricey compared to a couple of
SCRs (3 bucks).

I'm trying to use stuff I've got laying around. I've got all the parts
except the pulse transformer and SCRs.

 

I've just learned that Panasonic is obsolecsing a whole bunch of their
capacitors. (Production has been getting emails from digikey for a
while but told me about it at today.)
We use the Panosonic P-series caps for their low dissipation factor in
a bunch of high Q filter circuits. The dissipation factor is quoted
as 0.1% at 1kHz. Is there another supplier of 'good' polypropylene
capacitors? Or is Panasonic making a replacement part. (I fired off
an email to Panasonic but don't expect to hear back till Monday.

Thanks,

George Herold

 

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Kid's
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EUR:17 18 19 20 21 22 23 24 24.5 25 25.5 26 26.5 27 27.5 28 29 30 30.5
31

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seriouswholesale - Buy from the source, profit without the hassle.

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with no additional fee - Pay by safely by PayPal seriouswholesale
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check out Future Mobile Phone
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[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:46929171.7393CA65@hotmail.com:

LEDS operate at lowish voltages. You tend to get lower efficiencies
with at lowish voltages, largely due to rectifier losses.

I doubt you'll much better 85% power conversion efficiency overall
from the AC line to the LED package actually. That would be a *very*
good figure.

LED drivers chain LED's to limit that problem. The one I bought can chain 7
LED's.

 

[N_Cook]

From the 1970s / 1980s. I have an RCA databook with a lot of the big number
RCA transistor full data, but cannot find full data anywhere on these 1C..
ones , that is 1C ( one see) not IC ( India Charlie ).

Google, in half the hits seems, to show lesser data/ working subs I've put
on the net over the years.

Just repaired a 1986 HH which used , no problem with it, 1C03-C which is
presumably a voltage binning band, but thought I'd try locating some proper
info on this RCA range for when I need it in earnest.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

 

[Jamie]

Ecnerwal wrote:

In article <kgYIi.120449$U01.973993@twister1.libero.it>,
sr <abc@def.invalid.com> wrote:


my only
requirement is the DIP package: being still not skilled/equipped for SMD
soldering I'm forced to go for a stone age old DIP part, which makes it
harder to find.


Hand soldering SOIC surface mount parts is really quite easy, using
normal solder and normal irons (well, normal electronics irons, not your
old Weller 100-watt pistol-grip).

reminds me of the story of some one I know attempted

to unsolder the display lights from his car stereo unit because
the lights burnt out in the LCD display unit. They only wanted
to charge him $20.00 in labor to change the lights for him.

He used a torch.

needless to say, the final bill for his repair was much more than
$20 bucks.



--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

 

[Eeyore]

"Mr.T" wrote:

"Richard Crowley" wrote in message

The "enclosure temperature" *IS* the "ambient temperature"
for the lamp. Whether the rest of the locale is -40F or +135F
makes no difference to the discussion.

Sure, if your object is to confuse people, then not spelling out exactly
what you mean is a great way to do it.

It is a good point though.

Graham

 

[JW]

Hello,

Does anybody know of a suitable replacement for the optical rotary
encoders that were used on older Agilent/HP 65XX and 66XX power supplies?
These were phased out on the newer generation supplies which use
mechanical types. Agilent no longer has any stock, and advises me to
replace the entire front panel PCB at a cost of $631.00.

I believe that the encoders are part #0960-0822. I have no documentation
on them. Pictures can be seen here:
http://home.comcast.net/~66gtojayw/Agilent_encoder-1.jpg
http://home.comcast.net/~66gtojayw/Agilent_encoder-2.jpg

Thanks.