audio recording on IC -help wanted

[John Miles]

Or you can just bend all but the ground pins outward from the base of
the chip (e.g., www.speakeasy.net/
~jmiles1/ke5fx/492ap/large/close1.jpg). The pins won't break if you
don't flex them more than once or twice.

What's the board in? A receiver? What's it do?

It's a PLL that locks a Tek 492AP spectrum analyzer to an external 10
MHz GPS reference. The box contains an x100 prescaler, x10 prescaler, a
phase/frequency detector made from two halves of a 74LS74, and a slow
loop filter made from an LF356 opamp. There's also a relay that
switches the correction signal in and out of the circuit based on
whether the GPS reference is connected.

The 494 and 494A had the reflock assembly built in, but the 492A didn't.
So I added it, along with a few other tweaks that bring it up to 494A-
level functionality.

Lots of stuff in a very small box, without much room for component
standoffs or other prototyping aids. I've built a ton of stuff that
way, at frequencies up to and including 2 GHz. Wouldn't even consider
any other assembly techniques for RF work at this point.

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------

 

[Joerg]

Hello Watson,

Why is that? Lead? I thought that paint with lead in it was a lot
worse.

I believe yes, plus other additives.

Regards, Joerg

http://www.analogconsultants.com

 

[Joerg]

Hello Watson,

BTW, you can go to Michaels or other hobby/crafts store and buy a whole
handful of ice scream sticks for a couple bucks. You don't have to wash
'em, then.

HD and Lowes have suitable hardwood strips, too. That is what I use when
it is a client's breadboard.

But these still don't come with vanilla almond chocolate crunch.
However, there is a trailer in front where they sell jumbo cajun links...

Regards, Joerg

http://www.analogconsultants.com

 

[Joerg]

Hello Watson,

Back in the early '70s I got some prototype boards from a company that
made aircraft receivers. They used four push-in pins, one for each lead
of the four corners of the IC. Two of these are usually power and
ground, pins 7 or 8 and 14 or 16. These four hold the chip up off the
board, and the other pins are wired spaghetti style, which I presume is
the same as your sauerkraut style.

Neat. Yes, sauerkraut style is similar to spaghetti style. No meat sauce
though ;-)

Speaking of this.. Last Sunday at our monthly compouter club meeting
someone donated a homemade S-100 system to the consignment table, but no
one bought it, so it ended up on the freebies table later, probably then
into the trash later. It had a chassis and box pop riveted together,
and the S-100 bus was all wire wrapped. A lotta love and time went into
building that way back in the late '70s.

Oh, wire wrap. Most older computers were that way in the 70's when I was
at university. It caused a lot of grief but then I found out an upside.
As a student you are always short of money, looking for an opportunity
to make a buck. These old wire wrap graves still would have some life in
them but not enough for the institutes to warrant the huge service
contract expenses or $200/hour repairs. So they just sat there, dead.
Then I offered to repair them provided I could do it my way. Brought the
big solder iron and soldered the whole backplane which brought them back
to life. They actually ran more reliably then ever, some told me. Often
the pay wasn't money but a keg and pizza which was then immediately
consumed by me and some staff on the lawn in front of the place.

Regards, Joerg

http://www.analogconsultants.com

 

[beerbarrel]

On Thu, 05 May 2005 06:27:20 -0400, Bill <spam@coqui.net> wrote:

beerbarrel wrote:



For what it is worth, as the others say Ebay is good. I picked up 5
24" by 24" double sided sheets for 20 dollars.

Ditto. You got a better deal than I did. I got 5 sheets about 14x14,
single sided, for 10 bucks.

-Bill

The guy actually sent the stuff from Canada and the shipping was
fairly cheap too. If I remember it was around 10 bucks...It sure beat
those little radio shack boards.
_____________________
www.ReformUS.org

 

[Pipex News Server]

See if there is a PCB manufacturer within resonable driving distance and
ask for scraps. That's how I got a huge stash decades ago. Single and
double sided, the good stuff (FR4). But it has to be picked up, in my case
they wouldn't have gone through the trouble of packaging and mailing it.
Basically it had to be no more effort on their part than a walk to the
dumpster would have been.

Mine weren't tinned though. Also, I am not sure if constantly touching a
pre-tinned board during experiments would be too healthy.
===============================

Printed circuit board scraps up to large pieces ,be it usually double sided
, are always available at ham radio flea markets in the various european
countries. I think I have stocked up for life ! From the larger bits you
can make neat enclosures.

Frank GM0CSZ / KN6WH

 

[Pipex News Server]

"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com> wrote
in message news:117k676ohnq41fb@corp.supernews.com...

LenAnderson@ieee.org> wrote in message
news:1115236668.490732.147080@f14g2000cwb.googlegroups.com...
[snip]

Cleaning OLD PCB stock the "green" way -

Sprinkle any kind of table salt on the PCB stock, then take
half a lemon and rub it on the salt. Most of the blackened
oxide will disappear!

I've amazed a few people when we go out to eat lunch. I take a
tarnished golden dollar and put it in the lemon from a drink, or catsup
works just as well. Less than a minute later, it's nice and shiny
again. The vinegar or citric acid reduces all that tarnish to
invisible. Some say the carbonic acid in the fizz in cola will do it,
too, but I haven't tried it. Check it out sometime when you're into
impressing your friends.

I tried that late last year on some 4" x 8" double-sided
phenolic substrate PCB stock after seeing all those "green"
site remarks that I didn't really believe. It WORKS!
Those pieces had been sitting in the back of the workshop
for about 35 years.

I did "cheat" a bit. Have a year-round producing lemon
tree and my wife had some coarse salt left over from a
canning experiment. Zero cost trial...lemons at the
markets can run 50 cents each. The residue can easily
wash down the sink, don't need any gloves, nothing toxic.

Just make sure you don't get any of it in a cut on your finger. The
lemon will add a whole 'nother meaning to rubbing salt in your wounds!!

Result is easily solderable although for best appearance,
some cleaning with a bleach-containing kitchen cleanser
will make it shiny and spotless.

LenAnderson@ieee.org

 

[Watson A.Name - \"Watt Su]

"John Miles" <jmiles@pop.removethistomailme.net> wrote in message
news:MPG.1ce19f58fed8a8c89896b3@news-central.giganews.com...

In article <TRRde.12358$J12.6081@newssvr14.news.prodigy.com>,
notthisjoergsch@removethispacbell.net says...
Hello Tim,

Just one more thought: I use "living-bug" arrangements almost
exclusively. Every once in a while I cut up some strips so they fit
the
most popular "underbellies" of chips. Then I glue the strips onto
the
large panel and the chips on top of the strips in a rider's fashion.
Ground connection can be achieved by slightly bending down a pin,
the
rest gets wired up Sauerkraut style like usual. When stray
capacitance
is critical I take washed wood strips instead of copper clad. Makes
for
a really nice excuse to eat another Haagen Dasz.

This avoids having to think in reverse pinout and it often looks
nicer,
too. Plus you can still see the "CD4007" on the chip.

Or you can just bend all but the ground pins outward from the base of
the chip (e.g., www.speakeasy.net/
~jmiles1/ke5fx/492ap/large/close1.jpg). The pins won't break if you
don't flex them more than once or twice.

Sometimes I'll use a drop of cynaoacrylate adhesive to hold the chip
into place if there are few or no grounded pins, but it's rarely
necessary.

This also works for SOICs and even TSSOPs, as long as you don't bend
the
pins more than once.

-- jm

What's the board in? A receiver? What's it do?

 

[Ross Herbert]

On Tue, 10 May 2005 00:01:44 +0200, koen verstappen <koenv1@xs4all.nl>
wrote:

Sombody knows where I can buy (best case for me an online shop) the LCD
Driver T6963C in small quantities (I have to buy 5 pieces)

greetings
koen verstappen

Perhaps this company? (see item 6)
http://inkoopactie.net/ia/341dj1xv/1

 

[Watson A.Name - \"Watt Su]

<LenAnderson@ieee.org> wrote in message
news:1115236668.490732.147080@f14g2000cwb.googlegroups.com...
[snip]

Cleaning OLD PCB stock the "green" way -

Sprinkle any kind of table salt on the PCB stock, then take
half a lemon and rub it on the salt. Most of the blackened
oxide will disappear!

I've amazed a few people when we go out to eat lunch. I take a
tarnished golden dollar and put it in the lemon from a drink, or catsup
works just as well. Less than a minute later, it's nice and shiny
again. The vinegar or citric acid reduces all that tarnish to
invisible. Some say the carbonic acid in the fizz in cola will do it,
too, but I haven't tried it. Check it out sometime when you're into
impressing your friends.

I tried that late last year on some 4" x 8" double-sided
phenolic substrate PCB stock after seeing all those "green"
site remarks that I didn't really believe. It WORKS!
Those pieces had been sitting in the back of the workshop
for about 35 years.

I did "cheat" a bit. Have a year-round producing lemon
tree and my wife had some coarse salt left over from a
canning experiment. Zero cost trial...lemons at the
markets can run 50 cents each. The residue can easily
wash down the sink, don't need any gloves, nothing toxic.

Just make sure you don't get any of it in a cut on your finger. The
lemon will add a whole 'nother meaning to rubbing salt in your wounds!!

Result is easily solderable although for best appearance,
some cleaning with a bleach-containing kitchen cleanser
will make it shiny and spotless.

LenAnderson@ieee.org

 

Rich Grise <richgrise@example.net> wrote:

you should see some of the chips they make! I'll try to bother to get a
pic to post. But you could sell inconel chip earrings in Hollywood for
probably an insane amount of money.

If your chips are anything like my chips, they are pretty sharp-edged,
and wouldn't make very nice jewelry. Dunno if there's an etch that'd
take the edges off of them, or if you'd be better off twisting up a
thin, smooth-edged ribbon of <shiny metal> for jewelry instead...

 

[Jeroen]

<joble_5@hotmail.com> schreef in bericht
news:1115802326.742665.31870@g47g2000cwa.googlegroups.com...

Hi,

I'm looking for an MCU for a central control unit (need
SPI+I˛C+UART+some I/O). Amost every manufacturer has a suitable MCU
f>or this application (Atmell, microchip, TI, ST, ...).

But what i'm looking for is
1) An MCU that can easily be programmed in circuit (few extra
components).
2) A FREE C-compiler with >4K program space. (most important)

Any ideas ???

Yes, AVR. Almost any AVR has ISP, basically no more than a 6 or 10 pins
header. WinAVR is a free C compiler.

 

[PJ]

<erfurth@gmail.com> wrote in message news:1115835749.755040.276970@o13g2000cwo.googlegroups.com...

AMP - TYCO 40977 Open Barrel Rings on REEL. There are 12,000 on a
reel. The reels are new.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7515055017&rd=1&sspagename=STRK%3AMESE%3AIT&rd=1

Thanks for looking,

Bill

HTML is not allowed in the location field. It used to be fun to put a link to a picture in there. Alas, ebay put an end
to that long ago....Paul

 

[Watson A.Name - \"Watt Su]

<alexwright321@altavista.com> wrote in message
news:1115930264.120995.170800@g14g2000cwa.googlegroups.com...

Anyone know how-to make a cable that would plug into my telephone jack
and then into my computer soundcard?

I bought one from EBay and when I plug the cable into my phone line
and
then into the soundcard my line
goes dead.

One guy mentioned he uses an isolator circuit of some sort to not
short
out the line in his device.

This is the one I bought below that doesn't work.


http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=14960&item=577413

6958&rd=1&ssPageName=WDVW

**********

This one below supposedly works with a soundcard and phoneline.


http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5769614109&rd=1&sspag

ename=STRK%3AMEWA%3AIT&rd=1

It's supposed to be used with a tape recorder which is isolated from the
AC line. It is not meant to be used with anything else connected to AC.

Buy a phone patch, which is made for this purpose.

 

[Wim Willemse]

<alexwright321@altavista.com> schreef in bericht
news:1115930264.120995.170800@g14g2000cwa.googlegroups.com...

Anyone know how-to make a cable that would plug into my telephone jack
and then into my computer soundcard?

A capacitor (e.g. 1 muF) in series with the center conductor of the

patchcord, and you have a cheap solution connection your telephone line to
your PC.

29 USD seems awfully expensive for a 1 muF capacitor.

Regards Wim

 

[Jim Adney]

On 13 May 2005 04:58:08 -0700 "bryan" <bwhiting@gmail.com> wrote:

I am looking for a thermal fuse, part D242. It was in a waffle iron.
See

http://content.honeywell.com/sensing/hss/thermal/product/thermalFuses.asp


It basically cuts the circut when the temp. gets above 240C. I just
need one, so if anyone knows where I could find one, let me know.

Try Radio Shack (might be in their catalog, by temp) or NTE. BOth have
carried a variety of temps over the years.

-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
-----------------------------------------------

 

[Jim Adney]

On 13 May 2005 08:48:07 -0700 ontadian@hotmail.com wrote:

Is it possible to charge a car battery using the cigar/cigarette
outlet. If so, what would the maximum charging rate be?.

The allowable charging current would be somewhere between 5 & 15 A,
depending on the wiring in the car and your adapter.

On many cars, thie outlet is disconnect from the battery if the key is
OFF. You could switch it to ACC, but this might turn on more things
and draw more current than you were able to pump into the system,
which would make this a losing proposition.

I once modified a car just so I could do this. I had to reconnect the
lighter jack to a fuse that was hot all the time.

-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
-----------------------------------------------

 

[Wim Willemse]

"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com>
schreef in bericht news:118cmmrilmcl718@corp.supernews.com...

"Wim Willemse" <w.w.willemse@planet.nl> wrote in message
news:d61n14$o0v$1@reader10.wxs.nl...

alexwright321@altavista.com> schreef in bericht
news:1115930264.120995.170800@g14g2000cwa.googlegroups.com...
Anyone know how-to make a cable that would plug into my telephone
jack
and then into my computer soundcard?

A capacitor (e.g. 1 muF) in series with the center conductor of the
patchcord, and you have a cheap solution connection your telephone
line to
your PC.

No, it is _not_ a solution. The telephone line must be isolated
completely from the equipment, both for shock hazard and for equipment
protection reasons. Connecting either side of the telephone line to
equipment will unbalance the line and cause multiple problems, RFI from
AM radio stations and a huge amount of HUM.

Well it works excellent for me; probably it is better to have a capacitor in

both the tip and in the ring wire.
I "tap" the telephone line with my PC wile the telphone is off-hook
ofcourse;
The Telephone set creates a proper termination for the line. The tap is a
high impedance tap which has not much impact on the line behaviour.

regards Wim

 

[Bill Janssen]

Wim Willemse wrote:

"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com
schreef in bericht news:118cmmrilmcl718@corp.supernews.com...


"Wim Willemse" <w.w.willemse@planet.nl> wrote in message
news:d61n14$o0v$1@reader10.wxs.nl...


alexwright321@altavista.com> schreef in bericht
news:1115930264.120995.170800@g14g2000cwa.googlegroups.com...


Anyone know how-to make a cable that would plug into my telephone


jack


and then into my computer soundcard?



A capacitor (e.g. 1 muF) in series with the center conductor of the
patchcord, and you have a cheap solution connection your telephone


line to


your PC.


No, it is _not_ a solution. The telephone line must be isolated
completely from the equipment, both for shock hazard and for equipment
protection reasons. Connecting either side of the telephone line to
equipment will unbalance the line and cause multiple problems, RFI from
AM radio stations and a huge amount of HUM.



Well it works excellent for me; probably it is better to have a capacitor in
both the tip and in the ring wire.
I "tap" the telephone line with my PC wile the telphone is off-hook
ofcourse;
The Telephone set creates a proper termination for the line. The tap is a
high impedance tap which has not much impact on the line behaviour.

regards Wim




The beast way to get audio from the telephone line is to use a

transformer with two identical
primary windings. Use the windings in series with a capacitor connecting
the mid points.

The mid points can then be used to check voltage, short (with 400 Ohms)
to "hold" the line
etc.

Bill K7NOM

 

[ehsjr]

Thomas David Kehoe wrote:
<snip>

I
can't figure out a way to measure current draining from each battery.

Others answered about the setup you have - don't do it.

But say you had a series setup with identical batteries.
To measure the current draining from each battery,
just measure the current draining from the series
combination. The current flowing in each battery is
the same.

Any other suggestions?

Yes - since you are designing the circuit, why not design
it to work from 3.7 volts instead of 4 volts? Otherwise,
a DC-DC converter, as Watson suggested. These days they are
unbelievaby simple - a chip and a few components.

Ed