开云体育

On Sunday 01 December 2024 09:50:58 am wn4isx via groups.io wrote:

Here is a link to Mr. Mimms own words detailing his fight with AT&T over breach of contract using LEDs as transmitter and optical receiver. It is amazing because the little guy almost never wins.

The excerpt from the book linked on that page goes into a bit more detail:



It's about 13 pages.

Compare to the poor sod who patented the slow kick wiper then spent half a lifetime fighting Ford.

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 know I build one for my father's car in the summer of 1968, I think the plans were in either Popular Electronics or Radio Electronics. He owned Dodge/Chrysler and required some intensive modification to the wiring because the wipers didn't just stop, they reversed and nestled down hidden out of the way.

Some of those setups are just weird. Mine was fairly straightforward.

I made one for my older sister's Chevy, easy peasy, large assed SCR, unijunction and she was ready to hit the road.

That does sound better than a relay.

And another "We stole your idea now bug off and leave us alone."


The moral is, if you come up with a wonderful idea, good luck not getting ripped off, might as well make it public domain to at least screw the big boys.

Yup! Just put it out there...

You Linux guys are lucky SCO lost....
" The software ( ) company SCO Group ( ) (SCO), formerly Caldera International ( ) , asserted in 2003 that it was the owner of Unix, and that other Unix-type operating systems—particularly the free ( ) operating system Linux ( ) and other variants of Unix sold by competitor companies—were violating their intellectual property by using Unix code without a license in their works"

That whole thing was such a joke!

--
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

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

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.
Bertho

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

On Saturday 30 November 2024 04:42:30 pm paul larner via groups.io wrote:

well i orderd one along with some esp32 blue pill boards to make a coil winder with,will see when they get here,aliexpress say delivery should be on dec 5th.

Oh, that ESP32 is a fun one. LOTS of capabilities there. Check out the youtube videos by Ralph S. Bacon (who unfortunately hasn't uploaded anything recently, I hope he's okay). He does a number of them that deal with that part...

--
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

On Saturday 30 November 2024 04:29:03 pm paul larner via groups.io wrote:

the main voltage pot is a 1k with just the center and one outer leg used,

In a situation like this, it's really best to tie the unused leg to the center one. The reason for this is if there's any intermittent contact, the effective resistance goes from wherever it's set to effectively an open circuit, where if you have the unused end tied to the center then an intermittent contact will at worst give you maximum resistance. This goes for trimpots, too. It's common practice, or should be.

--
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

On Saturday 30 November 2024 03:51:56 pm Roy J. Tellason, Sr. via groups.io wrote:

I have some radio shack packages with "IR emitter-detector pair" in them, ?and an assortment of phototransistors pulled from scrapping VCRS (there's at least two in every VHS machine) and some other parts salvaged from floppy drives, ?where they are used for write protect and index hole sensing. ?I haven't found any particular use for these parts, ?maybe I just haven't found the right inspiration yet...

Oh yeah, and optoisolators and optointerrupters. I have a whole tube of NOS 4N26, I think, plus piles of salvaged other numbers I did find a use for an optointerrupter. I was given a sewing machine motor, plugged it in and spitzensparken! So I disassembled it and replaced the cord. Then with it spinning I wondered how fast that thing was going. So I rigged up an optointerrupter on a bit of perfboard, put a bit of tape on the motor shaft, and coupled the output to my scope. It was a surprisingly high number as I recall, though of course there was no load on the motor...

--
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

On Saturday 30 November 2024 09:52:11 am Terry wrote:

BTW, (an aside) the "D" latch becomes a mono stable "flip-flop" when /Q output is
tied to the "D" input and clock cycled.

No, that's bistable.

--
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

paul larner <quadzillatech@...> added the photo album my psu : my psu pics

On Saturday 30 November 2024 07:52:01 am Andy via groups.io wrote:

Important points being that outputs are low upon turn on, ...

I think not.? Most if not all flip-flops come up in a random state when powered-up.? (Chances are they have a bias for one or the other, but that is not a design feature and should not be counted on.)

A point that I didn't address in my earlier reply. You've gotta do *something* with those set and reset pins. A power on reset signal would probably be a good thing to add to your design. That can be as simple as a resistor and a cap tied to the input of any schmitt-trigger gate's input, the output driving the reset line.

--
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

On Saturday 30 November 2024 07:17:08 am Bertho wrote:

It is not what you asked for, but if your relay has extra contacts you can wire it up to be latching and releasing with a separate line.

I can see how easy it would be to make a relay latch, but how would you get it to release?


--
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