audio recording on IC -help wanted

[GPE]

"Andre Majorel" <cheney@halliburton.com> wrote in message
news:slrnf78qhj.3qr.cheney@atc5.vermine.org...

On 2007-06-07, GPE <See_GPE_website@cox.net> wrote:

The parts I'm hurting on the most right now. Old (REAL old)
6800 series parts such as 6821's as well as 6502's and 6532's.
I could use tons of these if I found a reliable and reasonable
source.

Are WDC (Western Design Center) not good enough for 65xx ?

--
André Majorel <URL:http://www.teaser.fr/~amajorel/
(Counterfeit: apaponir@offer.com izikek@coarse.com)
"Duty, honor, country" -- Douglas MacArthur
"Travail, famille, patrie" -- Philippe Pétain

True, you can still get 65C02's and 65C21's. It's the 6532's that I have
trouble with. Finding reasonable, unused and non-counterfeit ones is getting
touger and tougher. I tried to talk them into making 65C32's. Sure... just
ante up a $10K upfront NRE... yeah, like a hobbiest can do that.

-- Ed

 

[jusme]

If you are sure that I don't have a method then, there is no point in
carrying this on.

I have been in this game for many years - over 50.


"Ross Herbert" <rherber1@bigpond.net.au> wrote in message
news:08kjv358isq89hie9a9ur0rg5ujqm7qm2l@4ax.com...

On Sun, 6 Apr 2008 22:21:43 -0500, "jusme" <jbleaux@gmail.com> wrote:

:Yep, it is. It is a good clue that I am talking to a dumb kid who knows
not
:much.
:
:I know that it is not proprietary yet, you think that it is.
:
:Grow up, get some modicum of intelligence and berate your parents for
:spoiling your sorry ass.
:
:Now, run along.

I have to agree with Michael on this. Having had more than 50 years
experience
in electronics myself, and many of these specialising in component
sourcing,
your accusation against Michael is way off beam. In my experience if you
can't
find a single reference to a semiconductor part number on the WWW then it
most
likely does not exist or you have the part number wrong. And don't believe
the
Google search results which turn up the part number associated with a
parts
broker - it doesn't mean they have it or have even heard of it.

If you are sure that this part number is NOT proprietary then tell us how
you
know this. I certainly don't know of any surefire method of knowing for a
fact
that a part number is proprietary or not and I am sure you don't either.

 

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[Arlowe]

Archimedes' Lever laid this down on his screen :

On Tue, 27 Jan 2009 19:44:14 +1100, Arlowe <bare.arsed@gmail.com> wrote:


You do not know anything about working with mains power...stick with
your radio shack electronics kit.


I have worked with mains power, and I have made 400kV power supplies,
asswipe. I know more about HV than a punk fucking sparky retard like you
ever will.

Tough guy huh....

you don't know shit.

 

[jamma-plusser]

I have an AMI 18CV8-15 on a PCB from 1993 that is failing (it only
works properly when I've given it a good blast with some freezer
spray, and it's slowly getting worse, ie needing more freezer spray to
make it work every time).

If I try and read it (my EPROM programmer, a Galep-4, supports it)
then I get a different reading every time.

Now I'm not that familiar with PLDs but as I understand it they have a
security bit - if this bit is set (not sure how I can tell!) then
would this account for the different reading every time? Or are the
variable readings caused by the PLD failing?

I've tried giving it a good blast of freezer spray before I try and
read it, but I still get a different reading every time.

Any advice please?

Thanks

 

Need to build a rapid discharge system for some lithium batteries.
Would like to draw 1.5A at 7.5V, so used a matching incandescent lamp.
When I plug the lamp in however, it doesn't light up. My guess is the
initial current drain as the lamp heats up exceeds the battery safe
limit of 2.0A and the battery automatically shuts itself off. I'm
thinking of putting an inductor in series to reduce the initial
current draw. Would that work? Approximately how many mH would you
recommend? Sorry for stupid questions, anything outside of realm of
bits and bytes is foreign to me...

Kind regards, YR

 

[John Fields]

On Sat, 26 Jan 2008 10:16:37 -0800 (PST), bill.sloman@ieee.org
wrote:

On Jan 26, 3:57 pm, John Fields <jfie...@austininstruments.com> wrote:
On Fri, 25 Jan 2008 20:27:44 -0800 (PST), bill.slo...@ieee.org
wrote:





On Jan 26, 2:08 am, John Fields <jfie...@austininstruments.com> wrote:
On Fri, 25 Jan 2008 14:36:13 -0800 (PST), bill.slo...@ieee.org
wrote:

On Jan 25, 6:08 pm, mad.scientist...@gmail.com wrote:
I am interested in building a "selector" gadget for devices that take
jumpers
to select a program, such as this game cartridge where you have 5
jumpers
to select program #0-31 (the jumpers represent the binary number):

snip

Why don't you just use a rotary switch which opens and closes four
outputs. You can get binary coded decimal or hexadecimal - if you use
a hex switch your users have to understand the the sequence
0,1,2,3,4,5,6,7,8,9,A,B.D,E,F.

---
What, no "C"?
---

Oops. That should have been 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F. Sorry.

Farnell stocks both kinds of switch in a variety of formats, and there
must be other broad-line distributors who cater to the segment of the
market.

It's a lot easier and cheaper than programming a PIVC and wiring up 7-
segment displays.

---
You still have to wire up seven-segment displays, and you still have
to wire up them up to BCD to seven-segment decoder-drivers, and you
have to wire the inputs of the decoder-drivers to pulled-up or
pulled-down switch contacts, so the only advantage is not having to
use logic to drive the decoder inputs.

Hexadecimal rotary switches have a pointer on the rotating bit which
points to the appropriate number out of the 16 printed on the front of
the part - you see the numbers and the pointer by virtue of the light
reflected from them.

---
Not always, and why are you going on about a 16 state hexadecimal
switch which can only switch between 16 channels when the OP said
he's looking for a BCD display and the ability to switch between 32
channels?

You do know how BCD works, don't you?
---

Sure. But what the client asks for, what the client wants, and what
the client needs are three different things.

---
And you, of course, are the one who will determine what the client
gets?

Reminds me of the joke where this guy goes into a brothel and asks
the madam if she runs a union shop. The madam says no, and the guy
asks how she splits up the take. She replies, "Well, out of every
$100 we take in the girl gets $40, the house gets $40, and I get
$20.

Outraged, the guy leaves and goes to another brothel which he finds
_is_ a union shop and that the girl gets $60 and the house gets $40,
out of which the madam takes her cut. "That's more like it," he
says, "I'd like Lily, over there."

"I'm sure you would," replies the madam, "but you'll take Emma; she
has seniority."
---

You get satisfied customers by giving them what they need at minimum
expense. If they really need a BCD display, that's what you give them,
but if they can settle for two parallel octal rotary switches
displaying all the octal numbers from 00 to 37 or one hex rotary
switch plus a toggle switch the circuit can be much simpler and
appreciably cheaper

---
What a horse's ass you are.

One gets satisfied customers by giving them what they want, and
second guessing them by telling them that what they really need and
what you'll provide them with is the Stilton you've selected for
them instead of the Roquefort they really want isn't going to get
you many happy campers.

Or, BTW, many employment offers.
---

Wasting time and effort duplicating this with a
seven segment display

snipped the fun bit

Besides, the OP stated that he wanted to use seven-segment displays
so, unlike you, who wants to shove his "solutions" down everybody's
throats I prefer to give 'em what they ask for.

I prefer to give them what they want, rather than what they ask for.

---
No, you prefer to give them what you think they should have.
---

Getting them to understand what they actually want can take a while
and requires some diplomacy - not one of my strong points and not a
skill user groups offer the space to exercise.

---
I think the problem isn't one of their being able to determine what
they want, it more like your _not_ being able to determine what they
want and trying to force your decision of what they need down their
throats.
---

If he wants to use an UP/DOWN pushbutton scheme, or a pot and an
ADC, that's fine with me and I enjoy the exercise of executing the
design, while it seems all you enjoy is trying to execute the
designer.
---

One of the marks of a good designer is that capacity to step back and
see what the client wants done - this does require some understanding
of what the client might be trying to achieve, and can frequently
avoid a great deal of unnecessary elaboration.

---
Yes, and you certainly proved that you had no clue that the OP
_wanted_ to be able to switch 31 channels and get a decimal
representation of the hot channel decimally when you unnecessarily
elaborated on that totally useless hexadecimal implementation.
---

Which, when you look at the price of BCD encoded rotary switches
turns out to be a serious _dis_ advantage.

You can pay of the order of $20 (if the U.S. dollar hasn't completely
collapsed since I looked at this evening paper) for a fancy
hexadecimal switch intended to end up on the front panel of
"professional" gear, or you can pay a couple of dollars for a part in
a dual-in-line package intended to be soldered into a board.

---
Ah, but if the application calls for a front panel, then the panel
mounted rotary switch (or the ON/OFF pushbuttons, or the pot and
ADC, or the rotary encoder, or thumbwheel switches, etc, etc.) could
be used to good advantage, especially if the front panel was
screened with numerical switch position/channel legends.
---  

Silk-screened front panels cost money - for prototype work we just
used Letraset transfers onto brushed aluminium to create the legends
and protected them with a layer or two of polyurethane varnish.
Cheaper and a great deal quicker.

---
Yes, and I've used Dymo labels. So what?

The point isn't that some panel marking methods are cheaper than
others, it's that, basically, your hex "solution" won't yield the
results the OP asked for.
---

Even Texas now has minimum wage legislation, so spending a couple of
hours wiring up several unnecessary seven segment display would chew
up rather more money than you'd need to spend even on a professional
rotary switch.

---
Several hours???

I guess you've never heard of PCB mount seven-segment displays.

Laying out a board to create a single protoptype can be worth the
effort for very high speed electronics. For this sort of work a one-
off prototype is usually hand-soldered onto perforated prototyping
boards. You can wire-wrap the connections but I've not seen it done in
recent years.

---
Oh, well...

If I don't go directly from schematic to PCB that's exactly how I do
my prototypes and one-offs. Vector T-44 terminals hot-pressed into
FR-4 perfboard with 0.025" diameter holes on a 0.1" rectangular
grid.

Components are mounted on the forked side of the terminal and the
connections wire-wrapped on the other side of the board. For
high-frequency stuff I use single or double sided copper clad
perfboard and spot-face a 0.1" diameter space around the terminals.

Works great.
---

If you've got access to a printed circuit layout program
that can do auto-routing, creating a printed circuit layout can be the
quickest way to get to a working board, but going from gerbers to
etched boards takes a certain amount of organisation which a
mad.scientist might not be able to access.

---
Again you digress.
---

Go to:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=1114210

and filter on "BCD" and "Panel Mount" for a shock.

My Digi-Key paper catalogue offers RTE DIL parts for around $3.00 each
- the catalogue does date back before the last Republican assault on
the U.S. economy, so current prices may be higher.

---
You really do have trouble staying on track and you never miss a
chance to spew vitriol, do you?
---

In case you hadn't noticed, the defects in your banking system
recently produced dramatic falls in every stock market around the
world. That gave everybody a lot more trouble than any comment I could
possibly make.
Try and vote for somebody with an ounce of sense in the next set of
presidential elections.

---
This is supposed to be a technical discussion, not an outlet for
your anti-American garbage. You really do have trouble staying on
track and you never miss a chance to spew vitriol, do you?
---

I'm sure that there are cheaper versions out there, but If I was
going to do it that way I'd use a cheap mechanical quadrature shaft
encoder.

And a couple of expensive 7-segment displays to tell you how far you'd
rotated the shaft?

---
And in which direction.  Of course, if that's what the client
wanted.  

What the client thought they wanted, not knowing what alternatives
were available.

---
You grasp at straws, Sloman.

The client described what he wanted to achieve and presented a
couple of ways he thought would get him where he wanted to be.

Your cockamamie hex rotary switch "solution", LOL, cannot by itself
a decimal display make.
---

You, however, would deride your client's wishes and insist
on doing it your way, and in the process lose friend and fee.

While your approach might be described as the electronic equivalent of
the vanity publisher. Flattering for the client, but scarcely offering
them the kind of service they ought to be able to expect from someone
skilled in the art.

---
LOL, I'm prepared to provide the OP with schematics for either or
both of the two 32 channel switch systems he earlier showed interest
in, (one of which I critiqued in order to show him a better way)
while all you're prepared to do is flap your gums about how he
should settle for hex switching and learn to interpret a,b,...
---

Fucking myopic idiot, you are.

Myopic I am - in one eye. The other one has mild astigmatism, which is
why I've still got binocular vision. Whether I'm an idiot or not is
not a subject on which you are equipped to express a useful opinion.

---
In my opinion, your opinion as to whether or not I'm equipped to
express a useful opinion is flawed.
---

Yesterday's job interview went well enough to show I don't look like
an idiot to people who do know something about electronics, but then
again I've always done well with the engineers at Philips - it has
always been the personnel department that has been unhappy with my
qualifications.

---
Too bad you're so easily outwitted and made to stand outside the
gates, cap in hand, by the morons in the personnel department.
Seems like after all these years, if you were any good, you'd at
least have _some_ internal engineering contacts who were aware of
your massive talents, wanted you on board, and could lean on
personnel in your behalf.


--
JF

 

[ian field]

"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
news:468BB728.11622F9@earthlink.net...

ian field wrote:

"Straw Man" <straw@man.orq> wrote in message
news:127ic2.5re.19.1@news.alt.net...
Don't let your doggies wonder off onto Phil Allison's property you will
never see them again.

Well he was raised by dingoes!


??? They didn't do a very good job of it, now did they?

Why do you think he's on meds?!

 

[Tim Shoppa]

On Oct 5, 12:11 pm, Stephanie <n...@notavail.net> wrote:

Not sure what series this is

- NPN or PNP bipolar
or
- FETs

small-signal transistors in through-hole DIP package.

Where should I start looking?

Stef

Common parts meeting your very vague outlines:

ULN2003A = 7 darlington-connected NPN pairs, all the emitters common.

CA3046 = 5 NPN's, pretty well matched, 2 of them connected as a
differential pair

CD4007 = 3 pairs of N and P channel transistors, one hooked up like an
unuffered CMOS inverter, the other two pairs with independent drains
and sources

At one point there also existed arrays of 4 2N2222's or 4 2N3906's
etc. in a DIP but I haven't seen these in years. In fact the CA3046 I
mention above isn't very common anymore either.

Tim.

 

[Lostgallifreyan]

"Arfa Daily" <arfa.daily@ntlworld.com> wrote in
news:7hzli.8397$XR.6713@newsfe4-win.ntli.net:

"Lostgallifreyan" <no-one@nowhere.net> wrote in message
news:Xns996BBE5824875zoodlewurdle@140.99.99.130...
"Arfa Daily" <arfa.daily@ntlworld.com> wrote in
news:WUsli.14837$vA3.1901@newsfe2-win.ntli.net:

I really
think that I'm going to have to buy one, and attack it with the
Dremmel

Set to with zeal, my son. > If I had a dremel, I would. Probably.

Did find this though:
http://www.claremicronix.com/datasheets/led/MXHV9910%20Data%20Sheet%20
Rev05 3107.pdf
Again, clickable: http://tinyurl.com/2kf3jv

That's interesting because it shows >90% efficiency as I hoped might
be had, from a circuit with no large smoothing capacitor. It's just
one tiny IC driving a MOSFET and using an inductor. I don't know how
big that inductor is, but not very, I imagine. Maybe similar to the
one on the module on the eBay page I linked to earlier. A series
chain of three or four LED's might well be driven directly from the
mains, and all fitted inside one of those small lamp capsules. Heat
dispersal might be tight, but
doable, especially in those lamps with the fine louvre shells to
allow convection to get in amongst the doings.

Well, that's not strictly true. The issue of where the input voltage
comes from, is carefully avoided in the data sheet. It only shows that
the chip can operate from a DC input range of 8 to 450v. To get the DC
input from the mains, would still require a bridge and smoothing cap.
However, looks like a useful chip, and a good candidate for the back
end processing. It claims that it can drive "hundreds" of LEDs in
series / parallel strings. Still reserving judgement at this time ...

Arfa

Hmm. Last post after a long day, that was. Should have seen that it
needed DC.

 

[Mike Harrison]

On Thu, 16 Aug 2007 19:25:54 -0400, Boris Mohar <borism_-void-_@sympatico.ca> wrote:

On Thu, 16 Aug 2007 22:53:34 -0000, jfezl07@googlemail.com wrote:

I'm curious about what this is. http://i199.photobucket.com/albums/aa115/jimi_026/glassres.jpg
The markings on it say, T1 1% US 60G. Could it be 60gig ohms?

It could be since it is encapsulated in glass. I have few one Tera ohm
resistors.

Quite possibly, but mounted on uncoated FR4 as it appears to be I doubt the 1% would be very
meaningful.

 

[Yuriy]

Interestingly your opinion that needs to be changed or added for
modelling of systems in JMCAD.

There was a new version- JMCAD-03.051 release.
Interestingly your opinion on the further development JMCAD.

JMCAD is an program for the modeling and simulation of dynamic
systems. This includes the ability to construct and simulate block
diagrams. The visual block diagram interface offers a simple method
for constructing, modifying complex system models.

Project detail and discuss:
http://jmcad.sourceforge.net/
http://sourceforge.net/projects/jmcad/

To join this project, please contact the project administrators

 

[Mad Scientist Jr]

I would like to hook up a variable capacitor to some audio circuits I
built for learning about synths and amps
(schematics are here:
http://www.geocities.com/usenet_daughter/tone_generators.htm )
http://www.runoffgroove.com/littlegem.html
http://www.runoffgroove.com/ruby.html
http://makezine.com/09/crackerboxamp/
)

because in some of these the capacitors change the pitch, tone or
other qualities.

These circuits run off a 9V battery and use capacitors with ratings
such as
220 uF
100uF,
0.1 uF,
0.01 uF
0.047 uF
so I would want variable caps in this range.
Do these exist? Online all I am seeing is ones rated in pF.

Also, assuming I find these, and get them working in the circuit, and
find a desired setting for a capacitor, how do you measure the
capacitance? I have a multimeter but have really only used it to
measure ohms.

Thanks...

 

[Joerg]

Martin Riddle wrote:

Yes indium-oxide, a yellowish material is usualy built up as a layer in the overlay and tied to GND.
I've also seen small mesh Stainless or steel screen used in front of LED displays.

Yep, the stainless steel is what we are going to do. Now I have to find
a really reliable conductive epoxy that cures without heat. Found
Loctite 3882, no info on their site so I just wrote to them. Let's see.

Cheers

"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message news:kVLmj.2071$so6.1959@newssvr19.news.prodigy.net...
After trying Google, McMaster, and lots of others: Is there a see-through (thin) mesh that can be fastened to the back of a
steel panel using conductive epoxy around the perimeter? Preferably something that can't rust.

It is to protect a LCD from getting hit by strong fields or really big ESD zaps. Currently there is only some kind of poly
film 1/10th" away from the LCD (doesn't touch). It's ok if the translucent properties aren't top notch since the LCD is
back-lit pretty well.

--
Regards, Joerg

http://www.analogconsultants.com/

--
Regards, Joerg

http://www.analogconsultants.com/

 

[Eeyore]

Lostgallifreyan wrote:

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote

In any event if you were intentionally adding heating you wouldn't
locate it on the ceiling !

I take it that big post of mine never got through... I described a house
where that is exactly what had been done.

It's a very odd idea indeed.

I don't think it's a great idea, but it's more effective than you'd think. The
sun doesn't add heat to the earth from below, either.

Neither does it do so in these latitudes from above.
Graham

 

[Jamie]

Lostgallifreyan wrote:

Jamie <jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote in
news:HnSmj.126$uZ.1@newsfe05.lga:


Lostgallifreyan wrote:

Hello. I want to use a phase controller with more control over a
drill's AC motor speed than the controller inside the drill. I'm
hoping it's enough to set the internal one at full speed and to ignore
it while using the external controller. Is this bad, and if so, what
can be done to make it safe? I could bypass the internal circuit but I
want to avoid that if possible. If it is safe to use both, are there
special considerations for setting the two controls?


Well there may be a problem if you already have a
electronic speed control in side it. If all it has is a
rheostat type speed control then you're all set.



It does, that's why I asked about two phase controllers. But if it is set
to pass through whatever it sees coming in, would it work as I described it?
This is not something for the usual try-it-and-see approach, not on new
equipmemt with maker's guarantee intact, which is also why I don't want to go
in and bypass stuff.
if it has a rheostat speed control,. you can run a phase control into it

as is.


--
"I'd rather have a bottle in front of me than a frontal lobotomy"

"Daily Thought:

SOME PEOPLE ARE LIKE SLINKIES. NOT REALLY GOOD FOR ANYTHING BUT
THEY BRING A SMILE TO YOUR FACE WHEN PUSHED DOWN THE STAIRS.
http://webpages.charter.net/jamie_5"

 

[Paul B]

I am looking for some 1-to-1 matching transformers to connect varioua
audio devices to my PC. I usually get noises and hum.

These line matching transformers are not so cheap at about Ł6 or 7
each.

Telephones seem to suppress line noise and hum rather well so I
figure the components they use are probably of half-decent quality.

If I strip down some landline phones I 've got here, then will there
be a matching transformer in each one? Or is their technology
different now?

 

[GPE]

"spy" <studio_1a@hotmail.com> wrote in message
news:1191876679.185347.321460@o80g2000hse.googlegroups.com...

On Oct 8, 10:34 am, "TT_Man" <Some...@ntlworld.com> wrote:
You may e-mail to us with the part request with target price !

He already told you what part he wanted. why you no rissen ?


I put this post so people can email me if they have them, and I need
only
2 pieces of AM33c93A-16JC in PLCC , NOS if possible

So, whoever has them please email me.

thanks

Avoid parts from HK and China. You will end up with 'something' marked with
the part number you want but you have a good chance of it being counterfeit.

EK

 

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[Floyd L. Davidson]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:

"Floyd L. Davidson" wrote:

Telephone cable is twisted pair

Which is why it's 100 ohms or so just like Cat 5 etc.

Except of course when it has loading coils in it, and
then it is something much higher.

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