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Need help finding a schematic for a Quasar TV/VCR combo
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Jim MacArthur
electronics forum beginner


Joined: 06 Feb 2005
Posts: 3

PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: DC motor controller 24 V, 30..50 A Reply with quote

Hi Stef,

Stef Mientki wrote:

Quote:
I'm looking for DC motor controler,
24 Volts, 30 .. 50 A.

A PC should control the absolute position
of the angle of the motor.
I'm not sure, but I think in general this is called a servo system.

This is indeed a servo system, by my understanding at least. You will
probably want to attach a linear pot to the motor's shaft to get
feedback on its position, although if you want continuous rotation or
very accurate position feedback a shaft encoder might be better.

Is this a normal DC brush (commutator) motor? Is so, a RoboteQ motor
controller (www.roboteq.com) will do what you want but it might be a bit
overspecified and expensive for what you want, these will run two motors
at up to 120amps each. There are many cheaper DC motor controllers
around, have a look at the ones used in Battlebots / Robot Wars, but so
far as I know only the RoboteQ has the position feedback ability built in.

Jim
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Michael Black
electronics forum Guru Wannabe


Joined: 24 Mar 2005
Posts: 251

PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: Would like info on Toshiba AM/FM chip Reply with quote

Dave (none@spam.com) writes:


Quote:
Could someone recommend a current AM/FM receiver chip in a DIP package?
Something that could be ordered 1-2 pcs from Mouser or similar place.
I'd still like to continue my little project.

If you only need small quantities, then buy a portable radio. Doesn't

have to be a portable, clock radios and even stereo receivers will offer
an IC if of the correct vintage, but portables are easier to lug home, and
may carry a lower price so if you get one that doesn't use an IC, you've
still spent less than ordering an IC. Car radios are also plentiful used,
though they often are a tad fancier and may not have the works in a single
IC. Go to a garage sale, or a rummage sale, or the Salvation Army, and buy
a radio for a dollar or so that looks recent enough that it would have an
IC. Buying a cheap new radio may even be a solution, given that one may
have to pay shipping for that simple IC.

If this is about getting a radio for some other final means, then
you've got the radio. If you just need the parts for something not
quite a standard am/fm radio, then you get the IC and associated parts
to recombine in some other fashion.

Once you've opened the radio, you search for the IC on the web. Be
sure to check the NTE replacement line; that's often a useful way
to get the pinout of an obscure commercial IC. Or, since you have
a complete circuit in front of you, just trace the circuit board
to figure out what pin does what.

Michael
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therepairman
electronics forum beginner


Joined: 24 Mar 2005
Posts: 1

PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: Looking for some 41256 dynamic ram (256K x 1) IC's in UK. Reply with quote

I found this seller in the USA to be very reasonable

you can contact him at this email addy

hs1948@yahoo.comxxxxxx

Remove the xxxx from his email prior to emailing him
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Dave
electronics forum beginner


Joined: 10 Mar 2005
Posts: 13

PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: Would like info on Toshiba AM/FM chip Reply with quote

et472@FreeNet.Carleton.CA (Michael Black) wrote in
news:cu42li$5m5$1@theodyn.ncf.ca:

<snip>

Quote:
If this is about getting a radio for some other final means, then
you've got the radio. If you just need the parts for something not
quite a standard am/fm radio, then you get the IC and associated parts
to recombine in some other fashion.

Once you've opened the radio, you search for the IC on the web. Be
sure to check the NTE replacement line; that's often a useful way
to get the pinout of an obscure commercial IC. Or, since you have
a complete circuit in front of you, just trace the circuit board
to figure out what pin does what.

Thanks for the suggestions...I did start out with a few Panasonic clock
radios that I bought surplus, but can't find info on the IC. I'd rather
just pay up to $10 for an IC that I know I can get data for right now.

I'm just working on a tabletop style radio. I'd like to try messing around
with a PLL circut & a PIC, which I already have. I also wanted to keep the
part count low.

Thanks,
Dave
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kiener656
electronics forum beginner


Joined: 24 Mar 2005
Posts: 1

PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: What size resistor to reduce 4.5v to 3 v Reply with quote

with:u=rxi you can simply find out,how big your resistor has to be
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Watson A.Name - \"Wa
electronics forum Guru


Joined: 02 May 2005
Posts: 795

PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: What size resistor to reduce 4.5v to 3 v Reply with quote

"kiener656" <heribertkiener6@hotmail.com> wrote in message
news:8cde0e67422c2ab87fee28a7220a16f4@localhost.talkaboutelectronicequip
ment.com...
Quote:
with:u=rxi you can simply find out,how big your resistor has to be

Not "simply" if the load is not a steady current (which it isn't). Duh.
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Guest






PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: Anyone bought from comp-recycle? (Was: Looking for US Source for Intel 80486 (Used/Pulls) Cheap Reply with quote

I have a stock of several 486 pulls . Please contact me at this email:

nospamhs1948@yahoo.com

Please remove the nospam prior to emailing me


On 10 Jan 2005 03:22:29 -0800, james.crompton@gmail.com wrote:

Quote:

John Atwood wrote:
Allen Michielsen <amichiel@servtech.com> writes:
I am looking for a source in the US to Mail Order a few Intel 80486

(33 or 66 Mhz) CPU's. I found a place which had them for $12 ea,
but
I lost the address. Compared to that, Jameco is a bit pricey at
$40.
They could be new, used, or pulls, it doesn't matter.

T Hakemack <haksauto@fbtc.net> wrote:
www.comp-recycle.com has them 33=15.00 66=35.00

Any happy customers of comp-recycle out there? They have some
things I'd like to buy, but a web search turned up one unhappy
customer at: http://www.internet-club.com/usa/pezz/

I'll cc the company to give them a chance to respond.


John
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Guest






PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: Looking for some 41256 dynamic ram (256K x 1) IC's in UK. Reply with quote

Please contact me at this email address. I have many in stock. No
minimum quantity. Please remove the nospam before returning email to
me.

npspamhs1948@yahoo.com



On Thu, 20 Jan 2005 20:46:51 +0000, David Chapman <dave@minda.co.uk>
wrote:

Quote:

Hi,

Does anyone (preferably in the UK) have surplus to requirements, or
know of a source of, around 50 of the old 256K x 1 dynamic RAM's such as
the Texas TMS41256 and other manufacturers' equivalent products?

If so, please e-mail me with details and price required.

TIA - Dave Chapman

David C.Chapman - Chartered Engineer. FIEE. (dcchapman@iee.org)
--------------------------------------------------------------------------
CHAPMAN ASSOCIATES is a Consultancy offering practical expertise and
design skills in the fields of counter-surveillance, electronic protection
and security. Visit our Web site at http://www.minda.co.uk
--------------------------------------------------------------------------
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Sam Goldwasser
electronics forum Guru


Joined: 30 Apr 2005
Posts: 611

PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: Info about Germanium Photosensor? Reply with quote

Kevin Criqui <usenet@kce.com> writes:

Quote:
I just got a few 1/2" diameter photodiodes that I think are
germanium. They are in a gold can a bit over an inch in diameter and
have 6 leads, 4 of which are active. The manufacturer's logo is a
square "G" and the part number is GMP942. Does anyone have any idea
who manufactured these? Best I can tell, there is a preamp built in
and these require plus and minus 15V to operate. These were sensors
in a system using a YAG laser.

There was supposedly a Germanium Corporation so that alone doesn't
necessarily imply they are germanium.

Why would you need a germanium detector in a YAG laser unless it was
running at 1319 nm or one of the other IR lines beyond 1100 nm.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.
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Steve J. Noll
electronics forum beginner


Joined: 02 May 2005
Posts: 33

PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: Info about Germanium Photosensor? Reply with quote

On Sat, 05 Mar 2005 15:25:20 -0800, Kevin Criqui <usenet@kce.com>
wrote:

Quote:
I just got a few 1/2" diameter photodiodes that I think are germanium.
They are in a gold can a bit over an inch in diameter and have 6 leads,
4 of which are active. The manufacturer's logo is a square "G" and the
part number is GMP942. Does anyone have any idea who manufactured
these? Best I can tell, there is a preamp built in and these require
plus and minus 15V to operate. These were sensors in a system using a
YAG laser.

Kevin

They're from Germanium Power Devices
http://www.gpd-ir.com/index.htm
There is a chance that they are quads, not amplified "hybrids".

Steve J. Noll | Ventura California (USDA Zone 10)
| The Glass Block Koi Pond/Fountain:
| http://www.kissingfrogs.tv
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Kevin Criqui
electronics forum beginner


Joined: 24 Mar 2005
Posts: 2

PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: Info about Germanium Photosensor? Reply with quote

Steve J. Noll wrote:
Quote:
On Sat, 05 Mar 2005 15:25:20 -0800, Kevin Criqui <usenet@kce.com
wrote:


I just got a few 1/2" diameter photodiodes that I think are germanium.
They are in a gold can a bit over an inch in diameter and have 6 leads,
4 of which are active. The manufacturer's logo is a square "G" and the
part number is GMP942. Does anyone have any idea who manufactured
these? Best I can tell, there is a preamp built in and these require
plus and minus 15V to operate. These were sensors in a system using a
YAG laser.

Kevin


They're from Germanium Power Devices
http://www.gpd-ir.com/index.htm
There is a chance that they are quads, not amplified "hybrids".

Thanks for the pointer. I don't see this particular model on their
produce list so I've emailed asking for more information. I've seen
quads in the same package, but this is definitely a single sensor and I
can see a fairly large IC next to it which is why I guessed that it has
a built-in preamp. I'll post again if I get specs.

Kevin
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Michael A. Terrell
electronics forum Guru


Joined: 24 Mar 2005
Posts: 2291

PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: Manual for Leader O-scope Reply with quote

Marlowe wrote:
Quote:

I just bought a used Leader LBO-508A dual trace Oscilloscope. Now I need
the owner's manual. I haven't been able to locate one. Any suggestions as
to a source for manuals?

I have an original Leader 508A manual .

--
Cyber stalking is a crime!

Michael A. Terrell
Central Florida
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Kevin Criqui
electronics forum beginner


Joined: 24 Mar 2005
Posts: 2

PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: Info about Germanium Photosensor? Reply with quote

Kevin Criqui wrote:
Quote:
Steve J. Noll wrote:

On Sat, 05 Mar 2005 15:25:20 -0800, Kevin Criqui <usenet@kce.com
wrote:


I just got a few 1/2" diameter photodiodes that I think are
germanium. They are in a gold can a bit over an inch in diameter and
have 6 leads, 4 of which are active. The manufacturer's logo is a
square "G" and the part number is GMP942. Does anyone have any idea
who manufactured these? Best I can tell, there is a preamp built in
and these require plus and minus 15V to operate. These were sensors
in a system using a YAG laser.

Kevin


They're from Germanium Power Devices
http://www.gpd-ir.com/index.htm
There is a chance that they are quads, not amplified "hybrids".


Thanks for the pointer. I don't see this particular model on their
produce list so I've emailed asking for more information. I've seen
quads in the same package, but this is definitely a single sensor and I
can see a fairly large IC next to it which is why I guessed that it has
a built-in preamp. I'll post again if I get specs.

I got a reply from GPD Optoelectronics today. The GMP942 is in fact a
germanium photodiode with an active area of 13mm and has a built-in
AD645 amplifier with a 1K feedback resistor. The ones I got are mounted
behind what appears to be a long pass filter (looks deep red when
looking through it) which makes the module fairly unresponsive to
visible light.

Kevin
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Guest






PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: LM-377N ??????? Reply with quote

On Sat, 25 Dec 2004 23:20:00 +1030, "spock" <ufp@optusnet.com.au>
wrote:

Quote:
Hello Folks
I have need for some (2 or 3) LM-377N dual audio amps for a repair I have.
Can you help
Is there a equivalent?
Thanks in advance.
Lee.

I located a guy who has these parts.

He can be contacted at this email.

RENOVETHIS_hs1948@yahoo.com

He has very good prices without any minimums
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EN
electronics forum addict


Joined: 01 May 2005
Posts: 91

PostPosted: Thu Mar 24, 2005 6:14 pm    Post subject: Re: clean coating from PCB Reply with quote

The clear coating is called conformal coating.
I guess you've found out that there are different kinds of conformal
coatings,
silicone and urathanes. I have used Zip-Strip, a paint stripper, and it
'does not'
remove any markings from the IC's. The conformal coating bubbles up.
Use running water to wash the board off.


"philo" <philo@privacy.net> wrote in message
news:31un42F3gq9k2U1@individual.net...
Quote:
aurgathor wrote:
I took apart a UPS, and the PCB, including a significant portion
of the components on it are coated with some kind of clear and
shiny lacquer. This is nice for some things, but now I can't read
the markings on the chips. What kind of cleaner is best to clean
the coating from the chips?

TIA,
aur


i'm sure this will work

http://www.mgchemicals.com/products/8310.html


but i'm also sure it'll be toxic as hell
so be sure to use it in a well ventelated area or outdoors
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