audio recording on IC -help wanted

[John E.]

Axial electrolytic
approx 0.5 inch (12 mm) diam, 1.0 inch (25 mm) length

Markings:
HGC
CP-C
2J104K
123

Google tells me it's a 0.1uF, but I can't find a reference for the "2J"
voltage rating. And, any idea what the other markings are?

There are no manufacturer markings (logo, etc.), just plain gray shrink
tubing with the above alphanumeric markings.

This is used in a single-phase 240VAC low current box fan speed controller (1
TRIAC is the main current controller).

Any help would be greatly appreciated.

Thanks,
--
John English

 

[JeffM]

msadkins04@ yahoo.com wrote:

I'd like to know whether it might be feasible, from a technical and
cost-effectiveness standpoint, to use a large array of specially
designed capacitors to hold excess electricity from solar plants for,
say, periods of a week or more.

This seems like a question for sci.electronics.misc
or even sci.electronics.basics.

The tiniest bit of research on your part would have revealed
that batteries are better for this:
http://www.google.com/images?q=capacitor+discharge-curve
http://www.google.com/images?q=rechargeable+discharge-curve

 

[Michael Linnemann]

You wrote:

After some Google searching and perusing the sites of the usual
contenders I only found one uC family that has serious on-chip RF
transceiver capabilities, the Cypress CYWUSB6953 and its brethren.
rfPICs and others usually only have a transmitter.

If it is a 2.4GHz transceiver you need (and not a complete wireless USB
link), you should have a look at www.nordicsemi.com. If you can live
with a 8051-compatible CPU core (_you_ can, I suppose), something
like the 24E1 might be a reasonable choice.

Anyhow, the Cypress will only serve 2.45GHz but I need the lower UHF
bands for range reasons. Is anything coming down the pike soon or will
that have to remain a two-chip solution?

What range do you need? With chips from Nordic, we ended our free air
tests when the parking lot of the company ended - nearly 100m, and zero
transmission errors. Ok, in a crowded train station it was about 30m
with 50% errors.

Regards
Michael

 

[larwe]

On Oct 24, 9:13 pm, Joerg <notthisjoerg...@removethispacbell.net>
wrote:

How about CC1110F32 from TI.

Thanks, Don! How could I have missed that? I was looking at lots of
CC11xx datasheets today. Five bucks is a bit highish but would work in

You should consider this part limited lifespan IMHO precisely because
of the 51 core. Remember Chipcon is now owned by TI. I would say if
your design horizon exceeds 3~4 years it would be better not to pick
this part.

What part of the spectrum are you trying to cover; 433MHz? 860-ish?
Quite a few solutions aimed at markets like RKE. For example Atmel
covers certain frequencies from 315 to 915MHz ASK/FSK selectable.

 

CCI engineers and manufactures power distribution Bus Bars and Board
Stiffener products. Our bus bars are custom designed and engineered to
accommodate specific needs. Engineers will work with customers to
provide a product suitable for their requirements. Standard board
stiffeners are a perfect solution for warped circuit boards. These
products have short lead times and offer flexible options in terms of
size, layers and insulation.

In addition, CCI manufactures and markets a broad product line of
standard and custom transient voltage surge protection products. We
offer solutions for commercial, residential (whole house surge
protection), industrial, data line, telephone and telecommunication
applications.

 

[Tom2000]

On Tue, 25 Sep 2007 23:15:28 -0700, brett4010@gmail.com wrote:

There is a new family of PICAXE microprocessors. These can be
prgrammed in cicuit with merely a serial cable. They will rum to
20MhZ and are th best thing that has happened in the world of
microprocessors. They use Ameican technology but are British built
(they have a bootstrap loader).

Yes, they're built from various 8, 14, 18, 28, and 40 pin PICs.

http://www.picaxe.co.uk/

And the development system is as free download. Extensive
documentation is provided from the Help menu of the Programming
Editor.

The system even includes a simulator!

The language is VERY easy to learn and I'd suggest learning to use
these in preference to others which need programmers, obscure voltages
and need programming out of circuit.

The language is a variant of BASIC.

There is a User Group for them.

http://www.rev-ed.co.uk/picaxe/forum/

Picaxe processors are incredibly easy to use and apply. Even though I
do quite a bit of work using PIC processors, I still reach for a
Picaxe now and again for rapid interface development, or to just
quickly try out a project idea. And, depending on the project's
requirements, a Picaxe might be all I need. The Picaxe has enough
power for some fairly sophisticated work.

Also, they're great for "portable projects." If you publish a project
using a Picaxe, anyone wanting to build it can do so without a huge
investment in development tools, something that doesn't hold true for
a PIC.

Picaxe processors are wonderful tools that you can use to teach
yourself the fundamentals of microcontrollers.

The best news? The chips are relatively inexpensive.

Tom

 

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[clifto]

Ron Capik wrote:

"Vacuum filled," oh how I enjoy that one. It evokes the image of
someone pouring stuff form this bottle of "vacuum" into each
light bulb.

However, I do believe it might be a bit more proper to say the
bulbs are (or have been) evacuated. <G

As long as you don't say something vacuous...

--
We can't possibly imprison 300 million Americans for not paying their
taxes, so let's grant all of them amnesty NOW!

 

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[Heath Raftery]

In comp.sys.mac.apps John E. <incognito@yahoo.com> wrote:

Windows OS can be run on Macs, but I'd like to know if there are any native
(OS X) development tools for programming microcontrollers on Macintosh.

If so, what flavor of controller? Web references?

I posed a similar question to the Apple Sci-Tech mailing list in August 2006.
At that stage the best solution I had come across (without actually trying
any) was an Atmel microcontroller, the AVaRICE (avrgcc and avrgdb)
development package, a 3rd party JTAG device and a Keyspan serial device.

The AVaRICE package is very UNIX-y, so there's nothing particularly OS X
native about this solution.

The alternate solutions suggested were basically:

* HiTek compiler for PIC. http://www.htsoft.com
* PICkit 1 Flash Starter Kit.
http://ww1.microchip.com/downloads/en/DeviceDoc/pickit.tgz

Not a great deal of options I'm afraid. As another responder suggested,
using the gcc toolchain from the command line is probably your best bet. By
the way, the gcc tools are ready to use when you install Apple's Developer
Tools.

--
*--------------------------------------------------------*
| ^Nothing is foolproof to a sufficiently talented fool^ |
| Heath Raftery, HRSoftWorks _\|/_ |
*______________________________________m_('.')_m_________*

 

[Art]

In March 2005, National Semiconductor announced
http://www.national.com/news/item/0,1735,1021,00.html
hybrid amplifer / PCM encoder chips to enable manufacturers to create
electret condenser microphones with digital output.
http://www.national.com/appinfo/amps/microphone.html
http://www.national.com/appinfo/amps/files/digitalmic.pdf

The idea is that the only analog amplification and conversion to a
digital signal occurs within the electret condenser microphone capsule
itself.
To me, it seems like "technology done right" to prevent interference
by doing conversion to digital as close to the microphone as possible,
and you can't get much closer than inside the capsule!

Has anyone seen or heard of an electret condenser mic capsule that
incorporates this technology?
I cannot locate one anywhere.
The www.bsecm.com website that National references doesn't seem to
work for me with Internet Explorer 7.

It seems to me that with such a capsule, ultraminiature Linux
computers such as picotux
http://www.picotux.com
and power over ethernet, it would be possible to create a web server
that streams output from a stereo microphone in a package scarcely
larger than an RJ-45 ethernet jack! Surely I cannot be the first
person to think of this....

 

On Mar 9, 1:46 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
wrote:

bill.slo...@ieee.org> wrote in message

news:8a9a815d-7dc5-485a-8128-00b959e9e5b5@x30g2000hsd.googlegroups.com...
On Mar 9, 10:47 am, "Michael A. Terrell" <mike.terr...@earthlink.net
wrote:

Hello folks,

I am getting cheap these days, I am trying to cut corner by tripling the
capacitance in the capacitor, is this possible? I have heard that it's
possible. Some people have done it successfully. I am just wondering if
any of you smart dumbass can help.

If you weren't quite the ill-informed idiot that you are, you'd know
that the dielectric in an electrolytic capacitor is formed by the
electrolytic oxidation of the surface of the aluminium foil the forms
the plates of the capacitor.

If you reverse bias the capacitor you can reverse this process, making
the dielectric thinner ( and more likely to break down). Sadly, the
reverse process is unlikely to thin the oxide layer to exactly the
same extent at every point, so you run the risk of lowering the
breakdown voltage faster than you increase the capacitance.

Right, I agree with your blabla... except how do you convert existing
capacitors into a higher capacitance without starting from scratch as you
suggested?

Try reading what I wrote. If you reverse bias an existing capacitor -
apply a couple of volts of postive bias to the negative terminal and
ground the positive terminal - you should progressively convert some
of the insulating oxide layer back to aluminium. Measure the current
that is going through the capacitor while you are doing this and keep
it fairly low - as when you "reform" an electrolytic capacitor (which
doing exactly the opposite)

http://www.vcomp.co.uk/tech_tips/reform_caps/reform_caps.htm

- how low depends on the capacitance of the capacitor you are fooling
around with.

A 33k resistor is probably as good as any to start with - if you screw
up the voltage until you've got say 30uA running through the capacitor
then leave it for a few minutes (watching to see whether the current
starts creeping up) then measure the capacitance of the capacitor
again to see if you've made any difference. Keep on extending the time
until you get bored, or do see a difference. If nothing much seems to
be happening, push up the voltage to get more current flowing.

I've never tried this - though I have reformed old electrolytic
capacitors - so I can't guarantee anything.

If you tried Pieter's approach you'd have a good chance of getting the
capacitor to spit out gobs of electrolyte, which creates an unpleasant
mess.

--
Bill Sloman, Nijmegen

 

[ehsjr]

MR COFFEE wrote:

Hi folks.
I am trying to put together Bill Bowden's thermostat circuit to
trigger back-to-back SCRs to turn on a water heater element run on
120v (to make a 500 watt heater).

I don't have a 3 winding trigger transformer laying around, but I do
have a nice toroid core I picked up surplus that is supposedly for
pulse transformer use. Can I just wind a trifilar winding around it
with some 28AWG magnet wire and have half a chance it will work? The
core measures about 2 uh with 8 turns on it, so I figure it is a
pretty low mu ferrite core.

TIA.

mr coffee

Yes, with a mod to the circuit. The transformer is driven by
6 volts, and just needs to turn the SCRs on. As drawn, with a
home wound unknown transformer, you risk burning out the PNP's,
so put a 100 ohm resistor in series with the winding that is
connected to the PNP collectors. If you use sensitive gate SCR's,
you can do that (turn them on) with very little current. Build
the circuit, and try it out with a 6 volt supply to a 6V load
on the SCR's rather than the heater, just to make sure it turns
the SCR's on when it should.

Once you're satisfied with the circuit, you can connect it to
the heater.

Ed

 

[Theo Markettos]

I'm looking for:

A VCO chip where all the VCO components are on-chip, in other words I feed
it some control voltage and it produces an output frequency. I don't want
any external components like R/L/Cs or crystals that might have harmonics of
the output frequency on them.

Broadband: something like 0-1000MHz, where '0' and '1000' are fairly
flexible. But not a range like 215-270MHz. A stepped range would be OK if
there were enough steps. I don't mind (in fact it'd be quite useful) if the
output was a divided form of the internal clock.

Don't care if it's linear or not, as long as it's stable enough that I can
draw a V/f graph.

The ability to keep the oscillator running but switch off the output pin.

No PLL.

It doesn't /have/ to be a VCO - if there's some other way to generate a
frequency on-chip that doesn't use a PLL that would be fine (ring
oscillators?).

Preferably plastic package.

It's only for experimental purposes so cost, board space etc isn't too much
of an issue.

Don't care about supply voltage or logic levels

I'm quite happy to use some chip that uses an onboard oscillator for other
things internally, as long as I can turn on and off the clock on an output
pin.


This sounds like a nuts request, but I have a genuine reason for wanting
this

Something like the DS1085 looks perfect, except its top-end frequency is
much lower than I'd like. Any other suggestions?

Thanks
Theo

 

[Floyd L. Davidson]

Ross Herbert <rherber1@bigpond.net.au> wrote:

On Sat, 03 Jan 2009 22:51:18 -0900, floyd@apaflo.com (Floyd L. Davidson) wrote:
:>Eg, a 600:600 ohm type operating into 10 kohms may well have a large
:>response peak at high frequencies while a 10k:10k type operating into 600
:>ohms will likely have serious roll off from a few kHz upwards.
:
:So read what you just wrote, and tell us how that affects a telecom
:circuit that is specified at 400-2800 kHz?

Should that not be Hz?

Yes.

If so, voice frequency circuits were all 300 - 3400Hz in my day.

The PSTN is specified from 400 to 2800 Hz, with 24 dB SNR.

Individual channels on various carrier systems, and some
private line voice circuits are specified with more
bandwidth.

Phil is just being a bit too specific. My remarks were applicable specifically
to the VF telephony freq range, which is the area of interest to the OP.

:>With transformers that have 1:10 or 1:20 step-up ratios for mic-input to a
:>valve stage, both load and source impedances become quite critical just to
:>stay within a +/- 2dB corridor across the audio band.
:
:At perhaps 15-20 kHz. So just who cares, in this case?

Exactly!

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

 

[Don Bowey]

On 3/10/08 2:33 PM, in article 1n0v0l.ot0.17.2@news.alt.net, "Meat Plow"
<meat@petitmorte.net> wrote:

On Mon, 10 Mar 2008 14:28:27 -0700, Don Bowey wrote:

On 3/10/08 12:36 PM, in article 1n0o47.v7c.17.1@news.alt.net, "Meat Plow"
meat@petitmorte.net> wrote:

On Mon, 10 Mar 2008 09:45:17 -0700, Don Bowey wrote:

On 3/10/08 9:39 AM, in article 1n0doc.iar.17.4@news.alt.net, "Meat Plow"
meat@petitmorte.net> wrote:

On Sun, 09 Mar 2008 21:39:05 -0800, Don Bowey wrote:

Date: Sun, 9 Mar 2008 21:39:05 -0800
From: "Don Bowey" <dbowey@comcast.net
Lines: 6
Message-ID: <fr2hhr$mda$1@aioe.org
NNTP-Posting-Host: UM0DbvcjL+QMbUOlXSkpow.user.aioe.org
Newsgroups:
sci.electronics.components,sci.electronics.design,sci.electronics.repair
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Look at his million posts!!! Cheeze with!

I would say without too much doubt that you're responsible for the
forgeries.


I would say with no doubt at all, that you are an idiot.

Says the obsessed fuckhead who follows his master Mike Terrell around
Usenet



You're an ass.

Says the illiterate stalking imbecile that posts shit like this:

Look at his million posts!!! Cheeze with!

heh

You're still an ass, you haven't changed anything with your dumb post.

 

[Radiosrfun]

"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:hDbFi.57560$sI3.9732@newsfe6-gui.ntli.net...

"Radiosrfun" <Radiosrfun@radiosrfun.com> wrote in message
news:46e5450e$0$22168$ecde5a14@news.coretel.net...
"robb" <some@where.on.net> wrote in message
news:13eagf1snq08509@corp.supernews.com...

"Don Bowey" <dbowey@comcast.net> wrote in message
news:C309D9D3.768F6%dbowey@comcast.net...
On 9/9/07 5:00 PM, in article 13e91vnnjlrvt71@corp.supernews.com,
"robb"
some@where.on.net> wrote:

"Don Bowey" <dbowey@comcast.net> wrote in message
news:C309CDE5.76867%dbowey@comcast.net...
On 9/9/07 12:09 PM, in article 13e8gsvrbsh6a50@corp.supernews.com,
"robb"
some@where.on.net> wrote:

The only thing that will make a difference is you posting a
schematic.

well if i had a schematic i would surely post it instead of circuit
board
pictures.

i was hoping some one might notice the chips used and there
configuration
and maybe have an idea about how and what to look for.

thanks for help ,
rob


you could make a list of the Ics on the board and download all the
datasheets for them. That should help you.

Hey Don,
I realize i am not even an electronic hobbyist more like a "dangerous
adventurere" at best when it comes to repairing electronics (i have
succesfully stripped 10 guage wire and i can distinguish resistor from
diodes most of the time)

but, how would looking up all the IC datasheets help ?

would it not be more efficient to concentrate only on the ICs directly
connected to the suspect components ?

thanks for your time,
rob




If you look up the "Data sheets" of those ICs - you can see what their
actions are "supposed" to be - and see if anything is failing to do it's
particular job. You can analyze the outside parts all you want - if a
Chip is failing - you won't know it without the data sheet and way to
check it for input/output. If you have an "input" signal to one of the
chips - but no output - then it isn't working. Not being able to
understand the action of those chips on that board - can leave you
scratching your head a while - and maybe running in circles looking.
Checking all the traces, switches, whatever - isn't a bad thing - but it
won't uncover a dead IC - especially if you have tunnel vision - not
wanting to accept it "may" be a chip. I'm not suggesting it "is" a chip -
but the suggestion offered couldn't hurt. You will have a much better
understanding of the "intended" performance of the circuit. Chips "can"
go bad.

Here's a good one that has stood me in good stead for years. The more pins
a chip has, the less likely it is to be faulty ... !!

Arfa

Don't think I ever heard that one!

 

On Mar 9, 3:28 pm, John Devereux <jdREM...@THISdevereux.me.uk> wrote:

bill.slo...@ieee.org writes:
On Mar 9, 2:40 pm, John Fields <jfie...@austininstruments.com> wrote:
On Sun, 9 Mar 2008 04:42:53 -0700 (PDT), bill.slo...@ieee.org wrote:
On Mar 9, 10:47 am, "Michael A. Terrell" <mike.terr...@earthlink..net
wrote:
Hello folks,

I am getting cheap these days, I am trying to cut corner by tripling the
capacitance in the capacitor, is this possible?  I have heard that it's
possible.  Some people have done it successfully.  I am just wondering if
any of you smart dumbass can help.

If you weren't quite the ill-informed idiot that you are, you'd know
that the dielectric in an electrolytic capacitor is formed by the
electrolytic oxidation of the surface of the aluminium foil the forms
the plates of the capacitor.

---
LOL, hook, line, and sinker! :

http://www.vcomp.co.uk/tech_tips/reform_caps/reform_caps.htm

If you weren't another uninformed idiot, you'd realise that the
proposition is at least potentionaly rational, even though Michael
Terrell is the source. It would be a daft thing to do, but could work,
after a fashion.

Have you not been paying attention to what is happening here recently?

Michael Terrell was *not* the source!

Ouch. I had noticed that someone was producing posts that purported to
come from him, but they were fairly obviously false. I should have
paid more attention to the signature.

I plead jet-lag. I got off the plane from Australia on Tuesday, so
I've been thinking that I ought to be okay by now, but I'm obviously
not thinking straight yet.

--
Bill Sloman, Nijmegen

 

[Arny Krueger]

"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:cBigi.5304$nE2.5018@newsfe3-win.ntli.net

Agreed that *should* be the case, but the fact is that
the envelope of a vacuum light bulb remains substantially
cold in use,

Maybe a really low-wattage bulb. But at 50 watts and up, you won't
comfortably unscrew a hot bulb with your bare fingers.

whilst a 6L6's envelope will take the skin
off your fingertips after a few minutes use ...
Arfa

 

[Eeyore]

Serge Auckland wrote:

"Eeyore" wrote
Serge Auckland wrote:

Quite apart from the problems of disposing of old CFLs, I question the
whole principle of Low Energy lighting. If you have a conventional bulb,
much
of the energy output is in the form of heat, which will help heat the room,

and consequently will reduce the need for other heating, central or
otherwise.

That's sort of fine if you want extra heat. Often as not you don't.

If the central heating is on, then you are, by definition, needing extra
heat. The heat output from lighting will mean that the room thermostat (or
radiator valves) will turn off that bit sooner.

Not really.

The heat from most lamps hangs around at ceiling level. It does sod all to warm
a room.

I suggest you compare sitting in front of a 1kw bar electric fire to switching
on ten 100w light bulbs to see how true that is.

Graham