HDTenEightyP/NetNews huggingface dataset:
From: aankrom@isis.cs.du.edu (Anthony Ankrom)
Newsgroups: sci.electronics,sci.physics
Subject: masers from magnetrons
Date: 11 Apr 92 06:45:40 GMT
Organization: Nyx, Public Access Unix (sponsored by U. of Denver Math/CS dept.)
Disclaimer1: Nyx is a public access Unix system run by the University of
Disclaimer2: Denver for the Denver community.  The University has neither
Disclaimer3: control over nor responsibility for the opinions of users.


  I have a large collection of magnetrons (yeah, from microwaves...). I am
interested in making a maser out of these magnetrons. Could anybody lead
me in the right direction to get this done? I don't really care if it's
practical or not. I just want to do it. Any good books to recommend? Or 
send me e-mail of schematics etc. (using ascii characters :)
Thanx
St. Anthony
Newsgroups: sci.electronics
Subject: Looking for Z80 development PCBs
From: phil@hansen1.ncd.com (Phil Graham)
Date: 13 Apr 92 20:50:57 GMT
Organization: Network Computing Devices, Mt. View, CA, USA
Keywords: Z80, hacking

I am looking for a developemnt PCB for hacking with a Z80.

If you know of a company that makes PCBs or loaded PCBs please let me know.

I would like to get blank PCBs for < $30 bucks or loaded ones for < $100.

Any ideas?


Phil




packet:	KJ6NN@N6IIU-1
email:	phil@ncd.com
From: rcain@netcom.com (Robert Cain)
Newsgroups: sci.electronics
Subject: Re: What is an Induction resolver?
Date: 15 Apr 92 06:09:02 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

I don't understand multiple rotor coils but ususally a resolver has two
stators at right angles and a single rotor.  The stators are driven in
quadrature, two sinusoids with a 90 degree phase difference, and the
rotor then delivers a (near) constant manitude sinusoid with a phase
angle that varies linearly with shaft angle.  These are most commonly
used on the end of the ball screws that drive the linear axes of machine
tools.  The shaft angle translates directly to linear position.  There
is a hybrid integrated circuit that takes the quadrature inputs and the
rotor output and delivers a 16 bit (maybe better by now) encoding of
the angle.  Now I remember what the multiple coils are for, with a proper
connection, you can get more than 360 degress shift per revolution of the
shaft and thus increase the resolution of the resolver.  (As in the 
department of redundncy department.)
-- 
Bob Cain    rcain@netcom.com   408-358-2007

"There are some strings.  They're just not attached."
                                                    Victoria Roberts
Newsgroups: sci.electronics
From: alanchem@csd4.csd.uwm.edu (Alan Scott Olson)
Subject: Software request
Originator: alanchem@csd4.csd.uwm.edu
Organization: Computing Services Division, University of Wisconsin - Milwaukee
Distribution: usa
Date: Tue, 14 Apr 1992 16:24:35 GMT

I'm looking for some public domain software for a PC that will allow me
to draw a circuit schematic and the print it on an HP LaserJet laser printer.

Does anyone out there have or know where I can get a copy of such a program?

Thanks

- Alan

-- 
 ___________/ Alan S. Olson  UW-Milwaukee Chemistry Department \______________
/     e-mail to alanchem@csd4.csd.uwm.edu  OR  alan@alchemy.chem.uwm.edu      \
|          Want some good music?  Check out Milwaukee's own BoDeans           |
+-----------------------------------------------------------------------------+
From: Randy.Baer@f310.n3603.z1.FIDONET.ORG (Randy Baer)
Newsgroups: sci.electronics
Subject: pc drawing
Date: Thu, 16 Apr 92 15:21:00 EDT
Organization: FidoNet node 1:3603/310 - Tetragrammatton, St Petersburg FL

  If you call TEtragrammatton BBS at 813-323-5056  assuming]
that you want these drawing prgrams to operate under dos and
there are a dozen or so electronic drawing programs. 

--  
Internet: Randy.Baer@f310.n3603.z1.FIDONET.ORG
UUCP: ...!uunet!myrddin!tct!psycho!310!Randy.Baer
Note:psycho is a free gateway between Usenet & Fidonet. For info write to
     root@psycho.fidonet.org.
From: donrm@hpnmdla.sr.hp.com (Don Montgomery)
Date: Tue, 7 Apr 1992 15:49:12 GMT
Subject: Re: Shaker driver
Organization: HP Network Measurements Div, Santa Rosa, CA
Newsgroups: sci.electronics

Try Unholtz-Dickie Corp., 6 Brookside Dr. Wallingford, CT, 06492
(203) 265-3929

Bolt the thing to the foundation of your house for the ultimate woofer.

Don Montgomery
donrm@hpnmdla.sr.hp.com
Newsgroups: sci.electronics
From: rme@msi.com (Richard Emberson)
Subject: Relays
Keywords: relay
Organization: Molecular Simulations, Inc.
Date: Tue, 7 Apr 1992 15:30:44 GMT


 I am planning to wire all of the wall switches in my house with low-voltage
(5v or 12v) wires that come together in a breadbroad/punchdown closet.
All of the fixtures and receptacles will be 120v but whether they get power
or not will be determined by the state of a relay in each of their power
lines. The relays will be actuated via a low-voltage signal. With this
arrangement I have a configurable electrical system and with some
smarts someplace (like a PC or Mac) I could make it very dynamic.

Question: What type of relay (or family of relays based upon power
rating) should I use. Solid state relays I think would be best.
Which relays are good for high induction power lines (lines with motors
connected to them)?
For high induction power lines should I combine the relay with surge
protectors? What combination?
Any experience in this area.

Richard Emberson
rme@msi.com
From: gt0297a@prism.gatech.EDU (Tim Drury)
Newsgroups: sci.electronics
Subject: Re: Engine Knock Sensor
Date: 13 Apr 92 20:42:30 GMT
Article-I.D.: hydra.54455
Distribution: na
Organization: Georgia Institute of Technology

i was under the assumption that a knock sensor was a wideband device.
the GM sensor is fairly wideband.  our engine would knock around
9.5 KHz but without a filter we were hearing a very low frequency   
(normal engine resonance i assume).
i havent done this yet but my idea was to build a narrow band pass
filter and demodulator (the diode & capacitor type) then do some
level detection with a comparitor to determine if knock is present.
the filter would be the switched cap. type with n=4 or 6.  these
are cheap and easy to use. 

let me know what you find out i would be interested in your design.

-tim drury
tdrury@calsun.gatech.edu
Xref: sparky sci.electronics:8290 rec.bicycles:9123 rec.motorcycles:12803
From: casseres@apple.com (David Casseres)
Newsgroups: sci.electronics,rec.bicycles,rec.motorcycles
Subject: Re: MC68000
Date: 9 Apr 92 23:39:38 GMT
Distribution: na
Organization: Apple Computer, Inc.

In article <1992Apr1.015035.6322@willamette.edu>, agulhati@willamette.edu
(Ashish Gulhati) writes:
> 
> 
> Has anybody designed a system using a 68000?

It can be done, but experience shows that it's very difficult to design a good
interface between the chip and the shift levers.  Also, the lack of a
barrel-shifter makes for inefficient control of headset clearance and rear
derailleur adjustment.  Otherwise, the MC68000 is a fairly good CPU for a
bicycle.

--
David Casseres
Exclaimer: Wow!
From: misra@matt.ksu.ksu.edu (Boo!)
Newsgroups: sci.electronics
Subject: motors
Date: 16 Apr 1992 14:59:59 -0500
Organization: Kansas State University
Distribution: world
NNTP-Posting-Host: matt.ksu.ksu.edu

	Hello again people. I am doing a project in which i need to move
about 20lbs using a motor. When i looked through the catalog of motors,
I have to say more confusion crept into my head. I have done some 
calculations, but I would appreciate your help. How would you 
calculate the torque in oz-in for such a system? The motor will
be connected to a threaded rod on which this 20lbs will rest. Thanks
for your help.
From: henry@zoo.toronto.edu (Henry Spencer)
Newsgroups: sci.electronics
Subject: Re: Plated thru holes
Date: 13 Apr 92 16:33:43 GMT
Organization: U of Toronto Zoology

In article <1992Apr12.023534.6081@aplcen.apl.jhu.edu> kmd@aplcen.apl.jhu.edu (Kevin Doherty) writes:
>  One thing I can't do, though, is make plated-through holes for my
>two sided boards...   how do I do it?

This group needs a Frequently Asked Questions list...

You can do plated through holes yourself as a lab stunt.  Controlling the
results well enough to make boards you can depend on requires a heavy
investment (thousands) in equipment.  Making copper lie down on and stick
to a plain board surface is hard, and doing it dependably requires fussy
control of things like temperature and solution chemistry.  It's not
practical for do-it-yourself.
-- 
GCC 2.0 is to C as SVR4 is to Unix.     | Henry Spencer @ U of Toronto Zoology
                             -Dick Dunn |  henry@zoo.toronto.edu  utzoo!henry
From: "wayne kelso" <wayne.kelso@canrem.com>
Newsgroups: sci.electronics
Subject: frequency counter
Date: 14 Apr 92 01:43:33 EST
Reply-To: "wayne kelso" <wayne.kelso@canrem.com>
Distribution: sci
Organization: Canada Remote Systems

I recently picked up one of those LCD counting modules at Radio 
Shack.{Part # 277-302} is there any way to create a circuit around this 
module to create a frequency counter?

Wayne.Kelso@canrem.com

---
 * Freddie 1.1 * Sticks and Stones may break my bones, so quit it.
--
Canada Remote Systems  - Toronto, Ontario/Detroit, MI
World's Largest PCBOARD System - 416-629-7000/629-7044
Xref: sparky sci.electronics:8274 rec.bicycles:9102 rec.motorcycles:12772
From: wb8foz@mthvax.cs.miami.edu (David Lesher)
Newsgroups: sci.electronics,rec.bicycles,rec.motorcycles
Subject: Re: Sticky Demand Traffic Light problem solution
Date: 9 Apr 1992 21:41:27 -0400
Organization: NRK Clinic for habitual NetNews Abusers - Beltway Annex
Distribution: na
Reply-To: wb8foz@mthvax.cs.miami.edu (David Lesher)
NNTP-Posting-Host: mthvax.cs.miami.edu

xxxxajh@brunel.ac.uk (Alan J Holmes) writes:


>>I guess I can explain it...most of you have missed the fact that these d
>>I fact I was supprised no one mention that aluminum (sp?) wheels have no
> 
>Is it just me and my terminal, was anyone else able to make 
>anything of the above contribution?  I'm sure that the contributor
>had something to say, but what was it?

Alas, it seems more people are submitting postings that are
lacking \newlines. The most frequent sources of this are:
	xrn - it seems as if the configuration in the
	distributation does not provide them, although it is
	very easy to correct this.

	Fido gateways - Although one of the fido<->Internet gateways
	packages (I think it's called 'fredgate') does provide
	\newlines, others do not seem to. 

I too, cannot read these posts. I sometimes write the poster, refer him
or her to spaf's postings, and if it is xrn, offer advice on how to fix
it. Some people welcome the advice. Others just post flames ;-}

-- 
A host is a host from coast to coast.....wb8foz@mthvax.cs.miami.edu 
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
Xref: sparky sci.electronics:8639 comp.dcom.lans.ethernet:631
Newsgroups: sci.electronics,comp.dcom.lans.ethernet
Subject: Building an Ethernet Interface
From: hilbig_t@qis.dofasco.ca
Date: 16 Apr 92 17:17:33 GMT
Organization: Dofasco Inc, Hamilton, Ont. Can.
Nntp-Posting-User: hilbig_t


Does anybody have experience with building a low-cost ethernet interface
for a microprocessor board.  I would like to keep the number of components
to a minimum, and if possible try to avoid as much analog circuitry as I
can.  This will probably limit me to AUI connectors (which is fine) or
possibly 10BaseT.  I would like to build it into part of a home-made 8 bit
Motorola 6803 micro board (don't laugh, the chip costs $5).

Any recommendations would be appreciated.  Please give me an idea of what
additional components would be required (ie. can I avoid the analog circuitry,
does it support/require additional local RAM for bufferring)?  Is there any
good articles in electronics magazines that would help?  Any other comments?

Thanks, Tom 

-- 

Thomas Hilbig,
Network & Hardware Engineer,		Address:    1330 Burlington St East,
Information and Automation Systems,		    Hamilton, Ontario
Dofasco Inc.                            	    Canada   L8N 3J5
hilbig_t@qis.dofasco.ca                 Telephone:  (416) 544-3761
From: nustad@lightning.med.ge.com (Tim Nustad  x7-4361)
Newsgroups: sci.electronics
Subject: Re: Need components...
Summary: Distributor for Toko
Date: 8 Apr 92 14:27:15 GMT
Article-I.D.: mr.1992Apr8.142715.19198
Organization: G.E. Medical Systems - Ultrasound


Penstock is a stocking distributor for Toko in the US.  I have a 
number for their Chicago Office:

	Penstock RF/Microwave Distribution
	708 934 3700
	Fax: 708 934 3748

You could also call Toko directly and ask them for your local
distributor (708) 297 0070.


	


--
==============================================================
   
   Opinions are, of course, my own and not GE's

   Tim Nustad - nustad@mrsvr.ge.com

===============================================================
Newsgroups: sci.electronics
From: caadams@atlas.cs.upei.ca (Kenny Adams)
Subject: Re: What's the correct cable for cable TV and baseband video?
Organization: University of Prince Edward Island
Date: Thu, 9 Apr 1992 00:41:24 GMT


Hi,
	with regard to the comment about having to spend big bucks for a
crimping tool to put bnc connectors on 8281 video cable, there exists
another option.  several companies sell twist on bnc connectors which should
be available for under $5.00 .  these work very well.  these connectors are
what we use at the tv station that i work for.  we have been using them for
over 10 years.  they are as reliable as a crimp connector(assuming both are
properly installed)  the 2 brands that i have used are B&L and Cambridge.

kenny
senior maintenance technician
canadian broadcasting corporation  cbct-tv charlottetown pei canada
caadams@atlas.cs.upei.ca  these are my ramblings and not the official words
                           of my employer.
From: LEEK@QUCDN.QueensU.CA
Newsgroups: sci.electronics
Subject: Re: kxp1124 printer
Date: 11 Apr 92 15:44:40 GMT
Distribution: na
Organization: Queen's University at Kingston

In article <1992Apr8.172326.24814@gdwest.gd.com>, stlucas@gdwest.gd.com (Joseph
St. Lucas) says:
>
>Hello,  I have a panasonic kxp-1124 printer hooked to my computer.  The
>manual says it has 6k print buffer memory, expandable to 32k.
>Has anyone done this expansion themselves, or know how to do it, etc.
>I don't mind playing with the innards of the machine if I know new chips
>(and where to put them) will do it.  THanks.

Well you get yourself a 32K static Ram chip (120ns or faster).  Pop open
the printer.  Pop the front panel off in case you have problem finding
the screws.  Those guys hide them in the front.  There are 3 philips
screws in the front behind the panel.  You'll need to remove the paper
knob too.

There is only 1 empty 28 pin socket on the whole PC board.  There is
even a indicator for the pin 1 (if not line it the same way as the 128K
ROM chip next to it.  Most good designs have chips facing the same way.
They'll have a fun time to reroute all the lines between the ram & rom
just to confuse you.  :)  <- If you know which one is the rom, you'll not
going to have problem :)  Assemble & test.  (If you don't trust yourself,
reverse the order of the two.)  Try printing a high-res graphics file
and set the printer to do a didirectional mode to test out the buffer.
Enjoy !!  I did.

>stlucas@gdwest.gd.com

K. C. Lee
Elec. Eng. Grad. Student
From: Jeff.Lindstrom@ofa123.fidonet.org (Jeff Lindstrom)
Newsgroups: sci.electronics
Subject: Sony remote
Date: Mon, 13 Apr 92 04:13:14 PDT
Organization: Universal Electronics Inc. (Public access BBS)

LS>To all: a neighbor of mine has a 6-7 year old Sony Trinitron, which works
LS>well except for the remote control. 

  When my Sony remote went bad, it was the button.  It went flaky, then non-responsive, and now it works fine.

___
     Amiga MailMan v0.

--  

Jeff Lindstrom
Internet: Jeff.Lindstrom@ofa123.fidonet.org
Compuserve: >internet:Jeff.Lindstrom@ofa123.fidonet.org
Newsgroups: sci.electronics
From: ochealth@unixg.ubc.ca (Harvey Burian)
Subject: TTL level control of 120VAC power
Organization: University of British Columbia, Vancouver, B.C., Canada
Date: Sat, 11 Apr 1992 22:43:29 GMT


Some friends are having trouble controlling an AC actuator.
They tried using a TRIAC driver (ie optocoupler) to drive
the TRIAC, which was to briefly switch on an actuator.

The setup usually worked, but occaisionally it didn't appear
to provide enough current to drive the actuator

In case this helps: they made a microprocessor controlled
keypad for a vending machine, in this case an old Coke (bottle)
vending machine. The actuator is supposed to advance a mechanism
that allows you to pull the bottle out. The digital stuff works
fine: it polls a keypad for a user's "account" and password, then
it deducts from the account, and then sends the "vend" signal.

In software, they tried enabling the triac driver for longer periods
of time, but this didn't seem to work any more reliably.
Next they used a relay, and this worked a lot more reliably, at least
vending, so now people get their bottles out of the machine when
they enter their password, but now the problem is slighlty worse:
occasionally on a transient on the power supply (especially when the
refrigerator motor switches off), the relay reacts and gives out
freebies occasionally!

IN summary: the triac/triac driver combo occasionally didn't drive
the actuator properly, ie not being enabled when it was supposed to.

the relay set-up occaisonally enables the actuator when it is not supposed to.

I can't get more specific about the actuator we are trying to operate:
this "vending machine account system" is retro fitted onto an existing vending
machine. Gauranteed it is an inductive load. They could try and measure it.
It operates on 120VAC, and normally only need  120VAC for about 0.5 seconds
(actually less).

Any help would be appreciated: this system works pretty well 90% of the time,
it just glitches now and then (not exactly disastrous given the purpose!)

If your wondering why they built it: it's a great additition to a pop etc.
vending machine you would have lying around an undergraduate club, or fraternity
where you have enough people buying stuff from the club on a regular basis,
that you can either pre-sell stuff (they get an account) or they buy on credit
(they pay at the end of month/term etc).

jpm
From: crichmon@sedona.intel.com (Chris Richmond)
Newsgroups: sci.electronics
Subject: Re: WANTED: Source for weird PLCC socket
Date: 1 Apr 92 15:53:02 GMT
Reply-To: crichmon@sedona.intel.com
Organization: Intel Corporation, Embedded Microcomputer Division


In article <9204010338.AA05319@lux.levels.unisa.edu.au>, 8918927y@LUX.LEVELS.UNISA.EDU.AU (8918927y) writes:
> 
>    Can anybody please tell me where or from whom I might be able to obtain
>    a 68 pin PLCC socket with **STAGGERED** pins.. _NOT_ the usual parallel
>    pin variety. I would like a couple of these sockets which are used in the
>    Atari ST range of computers. I have tried Atari but they are very slow to
>    deliver anything to their dealers here in Australia.

Try Yamaichi IC51-0684-390.  It is fairly expensive (~$30), but works
really well especially if you are changing the chip often.  I think 
that the stager is like I show below, but other part numbers may have the 
pin-out you need.

          o o o
           o o
      o          o
        o          o
      o          o
        o          o
      o          o
          o o o
           o o

Intent here is to show that all the short rows are not in the center.
Good luck!
--
 Chris Richmond         |     Internet: crichmon@sedona.intel.com
 Intel, Corp. C3-21     |     Phone: (602)-554-8827
 5000 W. Chandler Blvd. |     This crazy is a world place. 
 Chandler, AZ  85226    |     My think losing I'm mind.
From: ron@argus.lpl.Arizona.EDU (Ron Watkins)
Newsgroups: sci.electronics,rec.radio.amature
Subject: TTY33 and KIM1
Keywords: tty33 teletype kim-1
Date: 13 Apr 92 23:54:56 GMT
Distribution: usa
Organization: Lunar and Planetary Lab, U of AZ

I just picked up an old ASR33 teletype from the U of Arizona bid-sale. I
would like to interface this with my KIM-1 6502 processor. What I don't have
is any knowledge of the interface. I know it uses 20ma current loop. But
I also know that I need to install a TTY-KB switch on the KIM bus, but I
don't know which two pins need to be put on a switch. I also took a look
inside the tty and found that the wiring diagram for the KIM to TTY seems
to be using different pin numbers than I have on my tty. They told me to
hook wires from the KIM to the TTY using terminal block X (which I can't
seem to find) or to P2 pin locations identified by number. My pins on my
p2 are identified by alphabetic letters not numbers.
If anyone knows the pinout of the TTY or the switch location for TTY-KB
on the KIM, please e-mail me a note.
Thanks,
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ron Watkins	[ron@argus.lpl.arizona.edu] /		  _____	     /
931 Gould-Simpson bldg.			   /		 /    /	    /
University of Arizona			  /		/____/	   /
Tucson, AZ. 85712			 /	       /	  /
(602) 621-8606				/_____ unar & / lanetary /_____ ab.
Newsgroups: sci.electronics
Subject: Need info on Mot 68HC16 Tool Kit
From: Mike_Diack@kcbbs.gen.nz (Mike Diack)
Date: 13 Apr 92 19:24:06 GMT
Organization: Kappa Crucis Unix BBS, Auckland, New Zealand

Bob Kyweriga asks :-
What kind of power supply will I need for the Tool Kit.

I assume the associated s/w will run on a pc, but is there any
provisions for running the sucker off a Mac.

You'll need a 5 volt 1 amp psu to run the basic kit , and if youre using 
a Burr Brown PCM 56 d/a converter , you'll need a negative supply of 
8 to 15 volts as well (a few 10s of milliamps)

Regrettably , all the wads of software supplied is for ibbimish types 
of machimes , and loading is via a PARALLEL port (rare on a mac unless 
its a third party add on card) - so no dice , Macwise

Sorry , i would dearly like to run it off a Mac as well
cheers, Mike

From: tomb@hplsla.hp.com (Tom Bruhns)
Date: Sat, 4 Apr 1992 01:19:05 GMT
Subject: Re: What's the correct cable for cable TV and baseband video?
Organization: HP Lake Stevens, WA
Newsgroups: sci.electronics

naiming@eng.umd.edu (Naiming Shen) writes:

>I want to install wires for cable TV and maybe used for baseband video
>signal also. I saw my builder using RG-59/U type cable for the cable TV
>wiring; but on Radio Shack's catalog, there is a footnot saying 'RG59
>is not recommended for CATV'. In the hardware store, there are different
>kinds of RG-59 cables. I am confused here. Can someone tell me what's
>the correct cable for my purpose? thanks in advance.

True RG-59/U has a single braid shield and a "contaminating" jacket that
will eventually cause contamination to creep into the inner dielectric
and increase cable loss.  However, for CATV work, you can get "RG-59 type"
with a foil shield (possibly with additional braid as well) and a
better jacket.  The "RG-59 type" then refers to 75 ohm nominal impedance
and a particular diameter (e.g., for use with the F connectors sold for
RG-59, surprise.)  If you want to do things a bit better, use RG-6
type, which is slightly larger diameter and noticably lower loss.

BTW, our local cable company will sell RG-6 to folk who are wiring
thier houses for cable, at a very decent price.  Yours may do the
same...   Also, I've found extremely good RG-6 at an aircraft
surplus outlet (Boeing), at a very attractive price, though that's
hit-or-miss as to when they may have any available.
Newsgroups: sci.electronics
From: pschauer@den.mmc.com (Paul Schauer)
Subject: Panasonic Printer Memory
Originator: pschauer@evans
Organization: Martin Marietta Astronautics, Denver
Date: Tue, 14 Apr 1992 21:18:02 GMT

Forgive me if this is the second time this req shows up. My posting
program sent my last one off to lala land (I think...).
Could someone please email the info re: the Panasonic 1124 printer memory
expansion? My user hostile USENET program won't let me back in.
Especially the part about how to tear into the printer.
Thanks in advance, 
Paul
Newsgroups: sci.electronics