L
lewiseason@googlemail.com
Guest
Exactly... or keypads could be released in _both_ mtrix and single-pin
outs.
outs.
M
Michael A. Terrell
Guest
"lewiseason@googlemail.com" wrote:
On the same keyboard? WHY? It would either take two sets of
switches, or bring out every switch as a pair of contacts that would
have to be configured. There are ICs designed to convert 3*4, 4*4, or
4*5 matrix keyboards to BCD output. Add a BCD to decimal or binary
decoder and you have all the decoded outputs, along with 'N' key
rollover protection.
http://www.jameco.com/wcsstore/Jameco/Products/ProdDS/44564.pdf
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
On the same keyboard? WHY? It would either take two sets of
switches, or bring out every switch as a pair of contacts that would
have to be configured. There are ICs designed to convert 3*4, 4*4, or
4*5 matrix keyboards to BCD output. Add a BCD to decimal or binary
decoder and you have all the decoded outputs, along with 'N' key
rollover protection.
http://www.jameco.com/wcsstore/Jameco/Products/ProdDS/44564.pdf
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
L
Lostgallifreyan
Guest
"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in
news:46B8B429.4F625431@earthlink.net:
keypad and output separate pins for each key. If you can find that Seimens
12 segment IC that's just one IC plus a constant current source and a few
resistors. I didn't think I'd have to mention it again, but the OP seemed
to ignore it and has now spawned two new threads instead of retaining the
subject and posting in the original thread...
news:46B8B429.4F625431@earthlink.net:
I already showed that a dot/bar driver IC can take the input from one 3*4
keypad and output separate pins for each key. If you can find that Seimens
12 segment IC that's just one IC plus a constant current source and a few
resistors. I didn't think I'd have to mention it again, but the OP seemed
to ignore it and has now spawned two new threads instead of retaining the
subject and posting in the original thread...
L
Lostgallifreyan
Guest
"indep" <aefjkjjhh@kjbhhhh.com> wrote in
news:rn5ui.19628$LS4.172533@weber.videotron.net:
gain (beta, hfe) of 400 or better. If no suffix A B or C is specified, it
can mean they're all slower ones with the high gainers cherry-picked from
the batch already, but it's worth trying, they might include all likely
gain values in that batch.
news:rn5ui.19628$LS4.172533@weber.videotron.net:
Usually gain. If you can get several, and a transistor tester, look for a
gain (beta, hfe) of 400 or better. If no suffix A B or C is specified, it
can mean they're all slower ones with the high gainers cherry-picked from
the batch already, but it's worth trying, they might include all likely
gain values in that batch.
F
Franc Zabkar
Guest
On Tue, 7 Aug 2007 17:01:57 -0400, "indep" <aefjkjjhh@kjbhhhh.com> put
finger to keyboard and composed:
http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm
An ECG94 crosses to 2SC1114, 2N5838, 2SC1454.
http://www.flippers.com/X-Ref-ECG.html
A "C" suffix in European transistors often denotes a higher gain type.
I don't know about RCA, though.
- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
finger to keyboard and composed:
FWIW, the PS11327 crosses to an NTE94.
http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm
An ECG94 crosses to 2SC1114, 2N5838, 2SC1454.
http://www.flippers.com/X-Ref-ECG.html
A "C" suffix in European transistors often denotes a higher gain type.
I don't know about RCA, though.
- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
E
Eeyore
Guest
Franc Zabkar wrote:
Graham
Anyone's guess !
Graham
U
Uncle Al
Guest
Tom Potter wrote:
Do you think traffic cops will give up their lidars for this
incredible intellectual triumph of will?
sci.physics
sci.electronics.design
sci.engr.semiconductors
sci.image.processing
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
Do you think traffic cops will give up their lidars for this
incredible intellectual triumph of will?
sci.physics
sci.electronics.design
sci.engr.semiconductors
sci.image.processing
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
M
mensanator@aol.compost
Guest
On Aug 26, 8:32?pm, willshak <wills...@00hvc.rr.com> wrote:
"Do you know fast you were going?"
"No, but I know where I am."
A traffic cop pulls over Heisenberg and asks
"Do you know fast you were going?"
"No, but I know where I am."
S
Sam Wormley
Guest
mensanator@aol.compost wrote:
precision.
Bad joke--Heisenberg could know both, just not to arbitrary
precision.
Guest
On Aug 8, 6:01 am, Eeyore <rabbitsfriendsandrelati...@hotmail.com>
wrote:
I have 30 RCA PS11327-C transisters date coded 7935. This was old
stock from RCA in Camden, NJ. The transisters are new never used.
How many do you need?
Scott
wrote:
Graham,
I have 30 RCA PS11327-C transisters date coded 7935. This was old
stock from RCA in Camden, NJ. The transisters are new never used.
How many do you need?
Scott
R
robb
Guest
"Eeyore" <rabbitsfriendsandrelations@hotmail.com> wrote in message
news:46E40094.6EF793A9@hotmail.com...
thanks for reply and help.
is there a good way to test this ?
I would be convinced of that if they were all highly used keys... but
there are a total of 6 micro switches (for 3 buttons +/-) and they are not
typically all used with same frequency. One set is used most, one maybe
half that and the others very in-frequently as the nature of the values it
changes are not frequently used they are a convinience.
on the same board exists other buttons (same exact switch style) used more
frequently than these and they are still working ?? if that means anything
plus continuity tests just at switch connections to board shows changes as
as expected. The values may be no good but i get a continuity change that
matches with known working button/switches.
I am posting pics of the circuits on the binaries schematics page if that
will help ?
thanks again for your help ,
rob
news:46E40094.6EF793A9@hotmail.com...
hi,robb wrote:
hello,
i am trying to repair a fault with an user interface circuit (UIC) board
and
control board out of an old 1987's computerized programmable Pfaff
sewing
machine (made in Western Germany).
a for fun project for me , a challenge
programming consists of storing values in memory locations using keys
( +/-
buttons) on UIC board
PROBLEM : a group of 3 (+/-) *momentary switch* buttons on UIC board
used
to change memory values do not make any changes when pressed.
They're probably worn out.
Graham
thanks for reply and help.
is there a good way to test this ?
I would be convinced of that if they were all highly used keys... but
there are a total of 6 micro switches (for 3 buttons +/-) and they are not
typically all used with same frequency. One set is used most, one maybe
half that and the others very in-frequently as the nature of the values it
changes are not frequently used they are a convinience.
on the same board exists other buttons (same exact switch style) used more
frequently than these and they are still working ?? if that means anything
plus continuity tests just at switch connections to board shows changes as
as expected. The values may be no good but i get a continuity change that
matches with known working button/switches.
I am posting pics of the circuits on the binaries schematics page if that
will help ?
thanks again for your help ,
rob
R
robb
Guest
"Tom Biasi" <tombiasi@********optonline.net> wrote in message
news:YcTEi.7$tN3.2@newsfe12.lga...
thanks for the reply and ideas.
i have posted some circuit pics on the
"alt.binaries.schematics.electronic"
if that would help formulate some ideas
thanks for your help ideas and time,
rob
news:YcTEi.7$tN3.2@newsfe12.lga...
hi Tom,"robb" <some@where.on.net> wrote in message
news:13e7urcjl0sm347@corp.supernews.com...
hello,
i am trying to repair a fault with an user interface circuit (UIC) board
and
control board out of an old 1987's computerized programmable Pfaff
sewing
machine (made in Western Germany).
a for fun project for me , a challenge
Well without seeing the circuit I could only guess that they used RAS and
CAS to address the keypad matrix. (Row Address and Column Address).
The ribbon cable is a place to look but the addressing logic could be bad.
Tom
thanks for the reply and ideas.
i have posted some circuit pics on the
"alt.binaries.schematics.electronic"
if that would help formulate some ideas
thanks for your help ideas and time,
rob
R
robb
Guest
hello,
i posted some circuit board pics on the
"alt.binaries.schematics.electronic"
under topic ---- "pfaff UIC circuit board" to
if that will help formulate some ideas on how to repair.
thanks for any help,
rob
"robb" <some@where.on.net> wrote in message
news:13e7urcjl0sm347@corp.supernews.com...
> hello,>
i posted some circuit board pics on the
"alt.binaries.schematics.electronic"
under topic ---- "pfaff UIC circuit board" to
if that will help formulate some ideas on how to repair.
thanks for any help,
rob
"robb" <some@where.on.net> wrote in message
news:13e7urcjl0sm347@corp.supernews.com...
> hello,>
A
Anthony Fremont
Guest
Eeyore wrote:
them already with a multimeter.
All three of them at the same time?......yeah. Besides, he said he tested
them already with a multimeter.
S
Spehro Pefhany
Guest
On Sun, 9 Sep 2007 10:01:00 -0400, the renowned "robb"
<some@where.on.net> wrote:
probably not a dedicated micro, but there's something else active
there to keep the number of wires down. I'm guessing it's probably a
mechanical issue on the display/key PCB (broken trace, broken wire in
the flat cable). I'd pay particular attention to the flat cable wires
(test them) and the traces going to the switches.
PCB technology isn't/wasn't always 100% reliable, especially back
then, and it's also possible that a via has cracked and is
electrically open.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
<some@where.on.net> wrote:
What else is on the display board (part numbers)? Ca. 1987, it'shello,
i am trying to repair a fault with an user interface circuit (UIC) board and
control board out of an old 1987's computerized programmable Pfaff sewing
machine (made in Western Germany).
a for fun project for me , a challenge
programming consists of storing values in memory locations using keys ( +/-
buttons) on UIC board
PROBLEM : a group of 3 (+/-) *momentary switch* buttons on UIC board used
to change memory values do not make any changes when pressed.
the UIC board has a VFD output display (16 chars) and 12 input buttons and 5
indicator LEDs. All but 3 of the buttons register presses correctly. the 3
broken buttons seem to be individually ok as i get continuity changes when i
test with multimeter and push buttons.
this UIC board is connected to the control board via 12 conductor ribbon ???
I am not sure what kind of things to do to isolate trouble ........
i have dome visual inspection of solder joints and components with no
obvious issues.
How would the VFD display values , LED indicatiors and inputing buttons be
managed through a 12 conductor ribbon ??? in 1980's style ?? how to trace ot
monitor value changes.
Any troubleshooting or tracing ideas advice would br greatly appreciated.
thanks,
rob
probably not a dedicated micro, but there's something else active
there to keep the number of wires down. I'm guessing it's probably a
mechanical issue on the display/key PCB (broken trace, broken wire in
the flat cable). I'd pay particular attention to the flat cable wires
(test them) and the traces going to the switches.
PCB technology isn't/wasn't always 100% reliable, especially back
then, and it's also possible that a via has cracked and is
electrically open.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
R
Radiosrfun
Guest
"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
news:46E4614E.EE8E9220@earthlink.net...
brits - just one!
news:46E4614E.EE8E9220@earthlink.net...
Isn't the title of this thread a bit misleading and unfair? It's not "all"
brits - just one!
Guest
On Sep 11, 10:27 pm, Lostgallifreyan <no-...@nowhere.net> wrote:
built up out of protons and neutrons, and you put on a frosting of
electrons to neutralise the protons.
Unobtainium, dark matter and dark energy are going to have their own
aperiodic table, built up out of really exotic stuff like psychopathic
quarks and slow axions.
--
Bill Sloman, Nijmegen
The periodic table just covers regular matter, where the nuclei arebill.slo...@ieee.org wrote innews:1189480250.974766.143930@50g2000hsm.googlegroups.com:
Could it be possible that in the not-so-distant future we could be
able to manufacture our own nuclei at home? It certainly sounds more
like fiction than science, and the idea has both its nutters and anti-
nutters
While we are about it, I want a home assembly kit for dark matter.
Damn, that's not cool, we want proper rights for Unobtanium.
A formal
slot reserved in the Periodic Table would be a start.
built up out of protons and neutrons, and you put on a frosting of
electrons to neutralise the protons.
Unobtainium, dark matter and dark energy are going to have their own
aperiodic table, built up out of really exotic stuff like psychopathic
quarks and slow axions.
--
Bill Sloman, Nijmegen
L
Lostgallifreyan
Guest
bill.sloman@ieee.org wrote in
news:1189520576.788165.280930@g4g2000hsf.googlegroups.com:
Of Harmony for a bit of the wherewithal to make the legs and a few chairs.
I'll leave the table top to those who know what they're doing.
news:1189520576.788165.280930@g4g2000hsf.googlegroups.com:
I'd best fire up the interstitial gravity drive then and dip into the Eye
Of Harmony for a bit of the wherewithal to make the legs and a few chairs.
I'll leave the table top to those who know what they're doing.
G
Graham W
Guest
Jerry Lynds wrote:
missed or one which has some dead components on it. If you carefully
probe around the inputs on the various chips you should be able to
locate it.
HTH
--
--
Graham W http://www.gcw.org.uk/ XP1800+ Page added, Graphics Tutorial
WIMBORNE http://www.wessex-astro.org.uk/ Wessex Astro Society's Website
Dorset UK Info, Meeting Dates, Sites & Maps
You have an unterminated input somewhere. It is either one you have
missed or one which has some dead components on it. If you carefully
probe around the inputs on the various chips you should be able to
locate it.
HTH
--
--
Graham W http://www.gcw.org.uk/ XP1800+ Page added, Graphics Tutorial
WIMBORNE http://www.wessex-astro.org.uk/ Wessex Astro Society's Website
Dorset UK Info, Meeting Dates, Sites & Maps
J
Jerry Lynds
Guest
Got it! Thanks for the help to everyone between the three groups I sent
this to. I left the "Power Save" pin Floating (logic low) to disable that
feature. However, it turns out it needed to be connected to ground. I
connected the power save pin to GND via a 1K resistor (Thanks to a schematic
by Michael Schwingen) and now it works great...so far anyway!
Thanks guys,
Jerry Lynds
Halifax, Nova Scotia
this to. I left the "Power Save" pin Floating (logic low) to disable that
feature. However, it turns out it needed to be connected to ground. I
connected the power save pin to GND via a 1K resistor (Thanks to a schematic
by Michael Schwingen) and now it works great...so far anyway!
Thanks guys,
Jerry Lynds
Halifax, Nova Scotia