Re: Schematics to Circuit Board?
I use eagle with the pcbgcode plugin.
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its for the one i just linked francois,its half price of the ebay one but from aliexpress china,it took 8 days delivery ok,73 paul de m3vuv.
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Re: Schematics to Circuit Board?
I use Kicad to do schematics and board? Comes in windows and Linux and free to use? Eagle is another option Free version has restrictions but that shouldn't be an issue.? Kicad is probably the best though.
If you need to make the gcode file for a cnc machine there are many options.? Flatcam is ok but only comes in Windows version now.? Carbide Coper is an online gcode generator.? Rabbitcam is another option but click the correct link? -sourcerabbit.com -? you'll end up on a porn site.? Rabbitcam has a free to use option (at least I think it still has the option) with limits and comes in Windows and linux versions? Quite a lot of other software out there, just do a search for pcb cad cam software.
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The following items have been added to the Files area of the [email protected] group.
By: paul larner <quadzillatech@...>
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PLJ-8LED frequency counter modual issues
Hi all, I have a cheapo PLJ-8LEDfrequency counter modual,it works ok but for anything above hf needs a lot more drive,can anyone recomend or link to a schematic for a wideband buffer and amplifier to make this work upto uhf?,thanks in advance,i have added the manual and schematic to the files section.
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The following items have been added to the Files area of the [email protected] group.
By: paul larner <quadzillatech@...>
Description:
counter schematic
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Re: Light from semiconductor junctions
I read many NASA Tech Briefs and used quite a few of the
technologies reported therein!
Donald.
On 12/2/24 11:36, Roy J. Tellason, Sr.
via groups.io wrote:
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On Sunday 01 December 2024 03:27:27 pm Donald H Locker via groups.io wrote:
I would dispute the "let's waste money" part - there were a LOT of unknown variables when they started and they learned a LOT of lessons with little loss of life. The lives lost were due to making decisions about variables that they thought they knew about, but which were actually not as well known as believed - Challenger SRB O-rings and retainers; ice damage to thermal tiles; fire hazard of wire insulation in a high-oxygen environment coupled with lack of consideration for rapid module exit requirements.
There was waste, for sure, but I would argue the increase in knowledge far exceeded the dollar cost.
Donald.
On 12/1/24 14:34, wn4isx via groups.io wrote:
My uncle worked for a company that made sub assembles for NASA and NASA ordered a special run of maybe 1000 1N4004 in glass. They wanted to study what vibration did the the PN junction. It worked out the glass couldn't withstand the g forces of the shake table and failed long before any meaningful data was collected,
My uncle gave them to me. I should have saved them because they'd be collector's items today.
The company made the locking solenoids that held the LEM to the Apollo command module.
I have one of the engineering prototypes made for proof of concept.
So yes 1N4004 diodes are a dime a dozen (or nickle) but the glass envelopes were an odd ball.
NASA did all sorts of similar "Let's waste money." The major companies loved those projects, cost plus were contracts were amazingly profitable.
For some interesting insights into this stuff, they had a publication out called "NASA Tech Briefs", which I subscribed to for a while some years back. It was one of those "free if you qualify" kind of subscriptions...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
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understanding error voltage link to pll locking status
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Re: Light from semiconductor junctions
Those briefs appear to be available?
A lot to wade through when I run out of other things to do.....
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Re: Light from semiconductor junctions
On Sunday 01 December 2024 03:27:27 pm Donald H Locker via groups.io wrote: I would dispute the "let's waste money" part - there were a LOT of unknown variables when they started and they learned a LOT of lessons with little loss of life. The lives lost were due to making decisions about variables that they thought they knew about, but which were actually not as well known as believed - Challenger SRB O-rings and retainers; ice damage to thermal tiles; fire hazard of wire insulation in a high-oxygen environment coupled with lack of consideration for rapid module exit requirements.
There was waste, for sure, but I would argue the increase in knowledge far exceeded the dollar cost.
Donald.
On 12/1/24 14:34, wn4isx via groups.io wrote:
My uncle worked for a company that made sub assembles for NASA and NASA ordered a special run of maybe 1000 1N4004 in glass. They wanted to study what vibration did the the PN junction. It worked out the glass couldn't withstand the g forces of the shake table and failed long before any meaningful data was collected,
My uncle gave them to me. I should have saved them because they'd be collector's items today.
The company made the locking solenoids that held the LEM to the Apollo command module.
I have one of the engineering prototypes made for proof of concept.
So yes 1N4004 diodes are a dime a dozen (or nickle) but the glass envelopes were an odd ball.
NASA did all sorts of similar "Let's waste money." The major companies loved those projects, cost plus were contracts were amazingly profitable. For some interesting insights into this stuff, they had a publication out called "NASA Tech Briefs", which I subscribed to for a while some years back. It was one of those "free if you qualify" kind of subscriptions... -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin
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Re: Latching Relay Drivers
Look at 7474.
DK
On Saturday, November 30, 2024 at 05:53:13 PM EST, SheldonD via groups.io <68696465@...> wrote:
I had to go and dig for JK schematic. I have always (way back when) used NAnd gates to create. Did not know there were JK ff ic packages.? Maybe I did, and just used NAnd as the lab from TI missile systems was very generous with NAnd, NOr as well as XNAnd and XNOr. No guidance chips however :(
Do have a bunch of old Spartan FPGAs. Definitely do NOT remember how to program those, besides software was on the 486.? I have backup media somewhere... on floppies.
I actually found a pic of my notes (d. cameras still new and rare). Amongst other scribbling (regarding questionable parental lineage of the class instructor) was the line:
(2) 3input NAnd (2 j/k, 3 clock, 1(k) ties to output, 1(j) ties to comp output. Each Gate output ties to 2 input NAnd, whose 2nd input ties to other output.
I don't remember use or provision for set / reset lines. But, looking at ic packages, there are preset and clear. I think these might be the first inputs of 3 input NAnd that are connected to complimentary outputs.
It seems that every 'off the shelf' latch relay I looked at had some sort of 2/4/8 bit microprocessor, or intended to be tied to arduino/raspberry pi/etc.
Plan was to use NAnds to create my FF, input denounced using Schmidt trigger after a 300mS or so delay. So far, actual chip count is 4 for single relay: (1) 3ip NAnd, (1) 2ip NAnd, Schmidt Trigger, and the 2038. 2ndcrelay would need another asst of NAnds.? Plus inverter so have active low on strobe to improve noise immunity.? Drivers / Latches were intended to be in seperate housing than relays.
~SD
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Re: Latching Relay Drivers
Normally closed push buttons are not common as you have found out.
If you can find a refrigerator light switch, it would do.
Or a single pole double throw momentary switch.
Bertho
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Roy J. Tellason, Sr. via groups.io Sent: 1 December, 2024 12:44 To: [email protected]Subject: Re: [electronics101] Latching Relay Drivers On Saturday 30 November 2024 08:09:23 pm Bertho wrote: A momentary normally open push button to close and latch the relay A
momentary normally closed push button wired is series with the coil winding to release. I have a fair amount of switches on hand here, but none of them are normally closed. :-( -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin
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Re: Light from semiconductor junctions
On Sun, Dec 1, 2024 at 01:26 PM, Roy J. Tellason, Sr. wrote:
Heh. I don't recall seeing plans for such a thing in any of the magazines, though I suppose that it's possible. I built one in a minibox that bolted to the underside of the dash in a 1970 Dodge Dart. It used a 555 and a relay.
I'd have sworn I got the idea from Radio Electronics or Popular Electronics but I just did a search at World Radio History for both magazines, the earliest either has slow kick wiper was 1968, but I know I saw the plan somewhere.
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Maybe my uncle sent me the plans. I verified the year by the photos my dad took of me upside down under the dash of his car. It was also the first time I used forbidden words in front of my father.
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Oh, and I still hate Chryslers hide away wipers! It took me 2 days to figure out the wiring. My sister's car was easy, "Oh yellow wire to ground makes the wiper turn on..." I had more trouble satisfying her sense of fashion about where to place the knob.
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Re: Light from semiconductor junctions
I wish my uncle was still alive to share some of the experiments.?Many of the experiments were duplicates of experiments performed during WWII at Wirght-Patterson.NASA employed 400,000 at the peak of the Apollo program and received support from over 20,000 universities and companies.?
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In any program as massive as the manned space program, some waste was inevitable, mainly because the left hand and right hand didn't talk to each other. There were several instances of the company receiving duplicate test contracts. Being a money making operation, they conducted two identical tests.
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For all of the experiments, somehow foam escaped NASA's attention....
"A June 2003 article in the publication?Florida Today?reported that a study of NASA records showed that all 113 shuttle missions flown before the Columbia disaster were damaged by launch debris. "
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And of course we have the Challenger as a monument to NASA's decision making...
" Cold temperatures
The O-rings were made of a rubber substance called viton, but they were only designed to work properly above 53¡ãF.?On the morning of the launch, the temperature on the launch pad was 36¡ãF, causing the O-rings to become brittle and stiff."
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And?
"The man who tried to stop the Challenger launch due to concerns about the O-rings was?Roger Boisjoly;?he was an engineer at Morton Thiokol who raised significant concerns about the O-rings' ability to function properly in cold weather, which ultimately led to the Challenger disaster when the shuttle launched despite his warnings"
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Or the Apollo 1 pad fire. Out of all the tests NASA did for Apollo they failed to test the?flammability
of the material used in the construction.
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Frankly I'm amazed there weren't more disasters.
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Re: Light from semiconductor junctions
I would dispute the "let's waste money" part - there were a LOT
of unknown variables when they started and they learned a LOT of
lessons with little loss of life. The lives lost were due to
making decisions about variables that they thought they knew
about, but which were actually not as well known as believed -
Challenger SRB O-rings and retainers; ice damage to thermal tiles;
fire hazard of wire insulation in a high-oxygen environment
coupled with lack of consideration for rapid module exit
requirements.
There was waste, for sure, but I would argue the increase in
knowledge far exceeded the dollar cost.
Donald.
On 12/1/24 14:34, wn4isx via groups.io
wrote:
toggle quoted message
Show quoted text
My uncle worked for a company that made sub assembles for
NASA and NASA ordered a special run of? maybe 1000 1N4004 in
glass. They wanted to study what vibration did the the PN
junction. It worked out the glass couldn't withstand the g
forces of the shake table and failed long before any meaningful
data was collected,
My uncle gave them to me. I should have saved them because
they'd be collector's items today.
?
The company made the locking solenoids that held the LEM to
the Apollo command module.
I have one of the engineering prototypes made for proof of
concept.
?
So yes 1N4004 diodes are a dime a dozen (or nickle)? but the
glass envelopes were an odd ball.
NASA did all sorts of similar "Let's waste money." The major
companies loved those projects, cost plus were contracts were
amazingly profitable.
|
Re: Light from semiconductor junctions
My uncle worked for a company that made sub assembles for NASA and NASA ordered a special run of? maybe 1000 1N4004 in glass. They wanted to study what vibration did the the PN junction. It worked out the glass couldn't withstand the g forces of the shake table and failed long before any meaningful data was collected,
My uncle gave them to me. I should have saved them because they'd be collector's items today.
?
The company made the locking solenoids that held the LEM to the Apollo command module.
I have one of the engineering prototypes made for proof of concept.
?
So yes 1N4004 diodes are a dime a dozen (or nickle)? but the glass envelopes were an odd ball.
NASA did all sorts of similar "Let's waste money." The major companies loved those projects, cost plus were contracts were amazingly profitable.
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F1CHF
Bertho