Op amps problem Gain Calculation

[Wouter van Ooijen (www.vo]

Unless you know what your doing I would strongly advise against using USB.
Have you thought about using a standard RS232 port instead?

Note that with a standard USB-to-232 converter you don't have to do
any programming. Just install the drivers and it use it as a windows
serial port. Same holds for the FT232BM chip, but that is not
adviseable for a newbie because of the fine solder work required.


Wouter van Ooijen

-- ------------------------------------
http://www.voti.nl
PICmicro chips, programmers, consulting

 

[Electro]

Wow, thanks for the info! I don't think the programming shoud be too
difficult, I've got a bit of experience there, I'm just a bit lost when it
comes to electronics, (I only did and A/S level in it!). Unfutunately I only
have usb available on my motherboard, no serial, parallel or ps2. Only 12
usb and a couple of fire wire.


Edward <ed@stevens8436.fslife.co.uk> wrote in message
news:biful9$mt3$1@newsg2.svr.pol.co.uk...

"Electro" <no.mail@spam.com> wrote in message
news:bie7pk$43p$1@hercules.btinternet.com...
Hey ppl,

I'm pretty new to all this electonics jazz but I find the best way to
lean
new things is to jump right in then look for help...

I thought it would be fun to have an alphanumeric display on my computer
to
show things like the current mp3 playing. I found a few displays but
they
needed a parallel connection but I think I need a serial connection
because
I only have USB available. Unfortunately the serial alphanumeric
displays
were alot more expensive and also required 5 connections (perhaps from a
RS-232 kinda thing). I also looked for a usb to serial IC but they
seemed
really expensive ($70).

Should I just jack the whole plan in or is there an easy solution?

Thanks for any advice...



Hello,

Unless you know what your doing I would strongly advise against using USB.
Have you thought about using a standard RS232 port instead? You can buy
RS232 cards for as little as Ł20. If you haven't got much programming
experience you will find USB very hard to program. RS232 is much simpler
to
program and is also a lot easier to debug. To interface a serial LCD to
the
RS232 port would be easier and probally more fun. If you want to use a
parallel interface you could either buy a parallel port card or use a UART
connected to the RS232 port. The UART will convert the RS232 serial
stream
to parallel. If you are determined to use USB then you may need to
consider
how to convert the USB packets to a format that the LCD will understand.

Do you have a spare parallel port on your computer? If you do, you could
also use a UART to convert the parallel data to serial.

I've used USB on a number of different projects and it can introduce a lot
of problems if things don't go to plan. Its difficult to debug and more
requires more electronics work than other protocols. A website that
offers
a lot of info on USB is www.usb.org they also have a good forum if you
have
specific questions about the workings of USB.

 

[Jimmy]

Came by a syston-donner freq counter. Excellent condition but needs a few
drivers.
"tim kettring" <timkettring@aemail4u.com> wrote in message
news:834f3ccd.0308231048.54a0a0ed@posting.google.com...

Jimmy ,

I hope you arent bothering with nixies on a new project, they are antiques
..

try

http://www.tubesandmore.com/

when their database comes up again .
( keywords: electronic tubes )

Good Luck , you will need it .

tim CET

"Jimmy" <Gfender@carolina.rr.com> wrote in message
news:<Vf_0b.5867$J16.344738@twister.southeast.rr.com>...
Need 7441 nixie drivers will trade for NOS tubes or buy.

 

[tim kettring]

well , the ebay item went for about $90 , mabe try your next local Ham-Fest

I am going to mine as soon as I find the date-times and location

tim

"Jimmy" <Gfender@carolina.rr.com> wrote in message news:<AIs3b.39173$r15.1415971@twister.southeast.rr.com>...

Came by a syston-donner freq counter. Excellent condition but needs a few
drivers.
"tim kettring" <timkettring@aemail4u.com> wrote in message
news:834f3ccd.0308231048.54a0a0ed@posting.google.com...
Jimmy ,

I hope you arent bothering with nixies on a new project, they are antiques
.

try

http://www.tubesandmore.com/

when their database comes up again .
( keywords: electronic tubes )

Good Luck , you will need it .

tim CET

"Jimmy" <Gfender@carolina.rr.com> wrote in message
news:<Vf_0b.5867$J16.344738@twister.southeast.rr.com>...
Need 7441 nixie drivers will trade for NOS tubes or buy.

 

[tim kettring]

Send me price for the FT232BM chip , and a pin-out schematic ( unless
at my library ) .

Thanks Tim Kettring , CET-MD238

wouter@voti.nl (Wouter van Ooijen (www.voti.nl)) wrote in message news:<3f4afddd.31768891@news.xs4all.nl>...

I thought it would be fun to have an alphanumeric display on my computer to
show things like the current mp3 playing. I found a few displays but they
needed a parallel connection but I think I need a serial connection because
I only have USB available. Unfortunately the serial alphanumeric displays
were alot more expensive and also required 5 connections (perhaps from a
RS-232 kinda thing). I also looked for a usb to serial IC but they seemed
really expensive ($70).

I sell an USB-to-serial IC (FT232BM), but that chip has *very* tiny
legs, so I would not advise a beginner to try to solder it.

And you would still need a serial-to-LCD chip.

But maybe you can use a serial-interface LCD with a common
USB-to-serial converter (I sell both!)

If you have some patience: I am working on an USB interface for
standard LCDs.


Wouter van Ooijen

-- ------------------------------------
http://www.voti.nl
PICmicro chips, programmers, consulting

 

[Dan Barlow]

tim kettring wrote:

well , the ebay item went for about $90 , mabe try your next local Ham-Fest
I am going to mine as soon as I find the date-times and location

Wish I'd known they were still popular; sold several complete driver
boards with chips and 8 Nixies at a hamfest for $5.
-Dan Barlow

 

[Wouter van Ooijen (www.vo]

Send me price for the FT232BM chip , and a pin-out schematic ( unless
at my library ) .

webshop: http://www.voti.nl/shop
FT223BM: http://www.voti.nl/shop/products_1.html#IC-FT232BM , follow
the 'documentation' link to the manufacturers website for the
datasheet, drivers etc. Price depends on how you pay and whether sales
tax applies.

But beware: those legs are *tiny* !

I am working on a few PCBs for these chips, but those are not in the
webshop yet.



Wouter van Ooijen

-- ------------------------------------
http://www.voti.nl
PICmicro chips, programmers, consulting

 

[tim kettring]

Ed ,

The quickest and easiest solution is to just get an Apple II or Apple
IIe with Disk IIs , and dos , and some old 5-1/4" floppy disks for
storage . They can be had on E-bay and Ham-fests , I am in no hurry so
will buy only at Ham-Fest due to shipping $$ .

Schematics are available at Librarys for these units , and they are
fast !!

There are even proto-boards for them , I built a DTMF ( touch-tone )
telephone number decoder for dirt-cheap...saved over 100$ .

Sorry , but service-literature is pretty impossible to find for the
newer computers !!!...much less , the Periperals !!!

Good Luck .

tim CET MD-238


"Edward Cit" <ed@stevens8436.fslife.co.uk> wrote in message news:<bi58kh$mt8$1@newsg1.svr.pol.co.uk>...

Hi,

I need to interface a PC's floppy disk drive to a microprocessor based
system. Does anyone know what the interface to a floppy disk drive is
called? Also, does anyone know what the specification is called?

Thanks in advance,

 

[tim kettring]

Sorry instead of Apple II ( slang ) , I meant ( correctly ) Apple II+
or Apple IIe , the Real Origional Apple II is way too valuable as an
antique to play with ( although most people call an Apple II+ , an
Apple II )
Forget about any other apples !!!



"Edward Cit" <ed@stevens8436.fslife.co.uk> wrote in message news:<bi58kh$mt8$1@newsg1.svr.pol.co.uk>...

Hi,

I need to interface a PC's floppy disk drive to a microprocessor based
system. Does anyone know what the interface to a floppy disk drive is
called? Also, does anyone know what the specification is called?

Thanks in advance,

 

[Robert Baer]

whatever wrote:
SPAM virus...

 

[Bob]

On Mon, 10 Nov 2003 00:20:39 GMT, "James Sweet"
<jamessweet@hotmail.com> wrote:

"Chris Cooper" <chrisnews@sc3.net> wrote in message
news:3faed79f$0$200$75868355@news.frii.net...
My father has "bestowed" upon me the old family wire recorder, a
Silvertone
Model 8170. He claims that the last time he ran it (a year or two ago) it
worked for a while and then smoke came out of it.

And now I have it.

I opened it up, blew all the dust out, reseated the tubes, plugged it in,
and it ran fine - except that the only sound out of the speaker was a
strong
60 Hz hum.

For $20 I've ordered replacement tubes for it, seems like that's got a
good
chance of solving the problem.

If not, do people have suggestions on how to "debug" this problem? I've
got
an old oscillscope I can use.

It's got a schematic printed on the bottom of the case, but only about
half
the schematic remains, and it's the half dealing with the microphone and
phono input, not the speaker output.

The only idea I have, is to take beast apart even more, and try to
re-create
the schematic, or at least the speaker amplifier portion.

And then the next question - if I get this thing working (or even if I
don't), is there anything reasonable to do with it? It has some mild
sentimental value, not much, on eBay some of these are going for a
whopping
$10, are there museums that might be interested in such a piece?

Thanks all!
Chris


The tubes are probably fine, you have some audio and tubes rarely just fail
unless the heater burns out, usually they gradually get weak. Any
electrolytic capacitors are likely dried out and will need to be replaced,
switches should be cleaned, and everything carefully inspected.

Since you mentioned smoke, I would also look carefully at the
resistors. Smoke indicates that something got hot! Heat discolors
many components, making them easy to spot. (Good luck learning the
value, if they are burn very much!)

The comment about capacitors is also very correct.

Bob

 

[BigWallop]

"Peter Lowrie" <peterlowrie@consultant.com> wrote in message
news:bKWub.8512$ws.742523@news02.tsnz.net...

The EFG 2210 sweep function generator shit itself and static component
tests
proved back to a dicky dual FET with old, old packaging. The code on the
side of the FET is unreadable. After weeks and months of searching I must
resort to beggery here in this newgroup, perhance you have the servce
manual/circuit diagram, or could point me towards it.

Ever g8ful.
Peter Lowrie

What are the FET working parameters ? Voltage, Amperage and the like, would
help lots.

<< http://shop.psaparts.co.uk/servlets/Page.Filler?_page=prodframe&ps=46142

---
http://www.basecuritysystems.no-ip.com

Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.541 / Virus Database: 335 - Release Date: 14/11/03

 

[---MIKE---]

I have two deep cycle batteries and two auto batteries for a backup
system in my house. I charge them all for 3 hours once a week and check
the voltage daily. They stay above 12.65 volts for the whole week and
are usually closer to 12.85 volts one day after charging. Does this
sound like a good plan?


-MIKE

 

[brooks]

It's made by Tectronix, it's old tube type I think.

Brooks


Gunner <redwitch01@hotmail.com> wrote:

Dose any one have any idea who made this scope
all i know is it was an old milatary scope

on the face it has (see attachment) a logo
that I do not know.
any info would be helpfull thank you

Eric

----== Posted via Newsfeed.Com - Unlimited-Uncensored-Secure Usenet News==----
http://www.newsfeed.com The #1 Newsgroup Service in the World! >100,000 Newsgroups
---= 19 East/West-Coast Specialized Servers - Total Privacy via Encryption =---

 

[scada]

"Gunner" <redwitch01@hotmail.com> wrote in message
news:Xns944534036B43Aredwitch01mchsicom@204.127.204.17...

Dose any one have any idea who made this scope
all i know is it was an old milatary scope

on the face it has (see attachment) a logo
that I do not know.
any info would be helpfull thank you

Eric

----------------------------------------------------------------------------
----



----------------------------------------------------------------------------
----


Yep, Tektronix..... was a favorite in its' day! (50, 60's)

 

[Michael A. Terrell]

bdm wrote:


None of the groups you cross posted this to is for binaries. They
belong on:
news:alt.binaries.schematics.electronic then post a message on an
appropriate group, pointing to the image.
--
23 days!


Michael A. Terrell
Central Florida

 

[Bill Chaplin]

Don't know what quality grass whomever was smoking but that cheap piece
o guano was never near a military base let alone used on one! That is
the junk kit issued as part of the schlock electronic "schools" of the
mid-late 60's There are thousands in every land fills in the
country,came without crystal osc. so were just a gradeschool toy?
Sorry Bill

Gunner wrote:

Dose any one have any idea who made this scope
all i know is it was an old milatary scope

on the face it has (see attachment) a logo
that I do not know.
any info would be helpfull thank you

Eric

[Image]

[Image]

[Image]

 

[Gunner]

Bill Chaplin <Reo@Eskimo.com> wrote in
news:3FD3FCF3.6BA094EE@Eskimo.com: Thank you Bill
But I like this scope because it is still working evan though it is only
a singal trace scope. I dont know if it was or was not millitary unit
but it has a marking like you might see on such eq that the millatary
will some time do to there EQ the marking is (L.S.W.T.)

Don't know what quality grass whomever was smoking but that cheap
piece o guano was never near a military base let alone used on one!
That is the junk kit issued as part of the schlock electronic
"schools" of the mid-late 60's There are thousands in every land
fills in the country,came without crystal osc. so were just a
gradeschool toy? Sorry Bill

Gunner wrote:

Dose any one have any idea who made this scope
all i know is it was an old milatary scope

on the face it has (see attachment) a logo
that I do not know.
any info would be helpfull thank you

Eric

[Image]

[Image]

[Image]

 

[Carmen]

Bill Chaplin wrote:

Don't know what quality grass whomever was smoking but that cheap
piece o guano was never near a military base let alone used on one!
That is the junk kit issued as part of the schlock electronic
"schools" of the mid-late 60's There are thousands in every land
fills in the country,came without crystal osc. so were just a
gradeschool toy? Sorry Bill

DH said he used one in the electronics calibration lab on the USS
Okinawa when it was still in service. They were being phased out, but
they were there.

Carmen

 

[Gunner]

"Carmen" <carmensrt@XXhotmail.com> wrote in news:mzMCb.12367$T14.6505
@bignews3.bellsouth.net:

Bill Chaplin wrote:
Don't know what quality grass whomever was smoking but that cheap
piece o guano was never near a military base let alone used on one!
That is the junk kit issued as part of the schlock electronic
"schools" of the mid-late 60's There are thousands in every land
fills in the country,came without crystal osc. so were just a
gradeschool toy? Sorry Bill

DH said he used one in the electronics calibration lab on the USS
Okinawa when it was still in service. They were being phased out, but
they were there.

Carmen

Thanks Carmen If you could give BD my email Addy that would be good