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Messages - Gen. Dreedle

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31
Non-Audio Topics / Re: It's working!
« on: February 07, 2017, 05:00:27 AM »
But what is my excuse?

Is senility a defense?

32
Digital Audio Stuff / Re: The ol' I/V and op-amp controversy
« on: February 07, 2017, 04:59:12 AM »
The guys who make it call it purple.

Picky, picky, picky.......................

oshpark.com

33
Non-Audio Topics / Re: It's working!
« on: January 27, 2017, 03:19:28 AM »
Well, here we are......................many years later, and despite having no new members, very little activity by our members (one of who I have not heard from, in a few years), I am pleased to announce...............

We are now #1, on Google, for Blowtorch schematics.!

Yep, we have passed up The Pub!

Don't ask me why I got bored enough to even look into that.....................it just goes to show........

SEO.................a load of codswallop. Remind me, if I ever start another audio company, to put "blowtorch preamp" on every single rotten lousy page.

Not that anyone would buy the crap I would design, if I had the JFETs to actually build the crap I would like to.....................

Now, where is that clown who used to lecture me, over at Greaser's Palace, on how stupid that I was for not understanding the usefulness of SEOs, and how to grow a forum that I was not interested in running, on a full-time basis.

34
Not too long ago, we made some measurements of old Toshiba TOSLINKs vs the crappy brand that you can buy at Mouser. Since the folks we did this for prefer to keep it private, I can not share it.

Let's just say they get worse as speed increases. The HS version is better than the regular version. Main conclusion is the RX have crappy, noisy (Chinese) transistors, and the TX LEDs are just ok.

All have a high noise floor. Which may or may not be important. Since SPDIF already has a high noise floor....................

The difference is the TOSLINKs have just plain ol' noise, and the SPDIF has correlated noise.

The only reason why SPDIF sounds ok is that nothing that you do affects the phase noise below 10 Hz or so. Eventually, the noise floor intersects the source phase noise, and that is that.

End of story.

No more help or clues.

Screw you guys.........................!

35
Well, not actually.

Not a fan of their crap.

First, their so-called 17 mm drip irrigation tubing is really 16 mm. You don't find that out until you have to repair one of their crappy lines with one of your 17 mm fittings. (If you look closely, you will see they call their fittings 16 mm.) Plus, they don't make drip tubing with the  right precipitation rate, for heavy clay soils. Not that many irrigators understand that...........................

(You will see tons of commercial installations with the wrong tubing. Even ones using other brands. Mainly because irrigators are both lazy and stupid. Easier to use a high-flow tubing, since you can program the controller the same as you would with a pop-up spray head. Idiots!)

Their controllers are ok. You see lots in use. We prefer Crap-o-matic ones. We started using them since they were the first "smart" ET-based controllers. As we found out, the hard way, they over-water, by around 20-25%. (And if you try to back it off, by that same amount, they go bonkers! That, and they don't work right if you try to get creative, in the programming. That, and they fired their customer support engineer, and now don't even offer new firmware, even if you drive to the factory, and drop it off.) (BTW, the other "smart" controllers are even worse. Most over-water by more than 100%.)

Bird Brain pop-up heads are decent. Although we prefer to use MP rotators heads. Even though they are now owned by Hunter. (Who changed the nozzles on the PGP rotators. Which are the most popular ones around. Which means if you replace rotator, and don't re-use the existing nozzle, you now have precipitation rates and throw radii that no longer match. Ooops...............) (And since we have already conclude irrigators are lazy and stupid...............)

So much for all my degrees in EE and former work in an R&D lab. You do what you need to do to put food on the table.

36
Analog Audio Stuff / Re: Yeah, just what is wrong with op-amps?
« on: January 26, 2017, 06:00:34 PM »
And this surprises whom?

About as much fun as watching the demonrats and the republicants throwing mud at each other.

37
Digital Audio Stuff / Re: The ol' I/V and op-amp controversy
« on: January 26, 2017, 05:57:16 PM »
Real long story short..................

Someone made a private reference, to a certain poster, over at The Pub. Seems to be a sharp guy, that has posted lots of good stuff. Took a look at his site, and one thing stood out.

He has a section on I/V stages.

One of the circuits was a discrete gizmo, similar to what I came up with, back in '89 (or whenever). One thing curious about it: it only had 0.25 V out, for 2.5 mA in. So, it needed a 20 dB amp, after it. Well, to my convoluted way of thinking, that kinda sorta defeats its purpose. This chap felt that raising the gain hurt distortion.

Well, ok................his circuit, not mine, and since it is a free world............

Now, by pure coincidence, I came up with a newer version of the I/V. Around 30 years to think of a better way to do it, maybe better parts (unless you want to make a JFET version, which I never would, despite my heavy reliance on JFETs), SMT, CAD PCB s/w, and a lot of other stuff, here is what it looks like:



(Yes, that is a Beavis and Butt-head mouse pad. Yes, there are mistakes in the layout. Yes, I left off the rail bypass caps. Stop carping!)

So, how does it work?

Well, here is the distortion. First, in % THD, and next in dB down:





So, with a 1 mA input (like you would get from that nasty old AD1862), and you want 2.5 V, it is less than 0.02% THD, and all the harmonics are down 80 dB. Good enough to use, without any tweaking.

And the input impedance............



Roughly 1.75R, and it is flat. OK, I did not calibrate the measurement, but so what.......................good enough to use.

Draw your own conclusions.

If enough folks ask, maybe I will make some more PCBs.

Not for sale to Ireland. (Not sure where that came from, but someone accused me of that before. So, why change now?)

Oh...............did this on +/- 12 V. Designed it to work on higher voltages, which is why some of the LEDs were passed over. Ran it on the designed 18 V rails, and it measured the same. (Because the gizmo it is going to get stuck in has 18 V rails.)

All for now................

38
Non-Audio Topics / Re: Old times....
« on: December 01, 2016, 05:22:58 AM »
One day, back in the late 90s.........................

A guy that didn't have a good impression of me, over at The Pub, sent me an e-mail. (I forget who he was, but I think he was from Denmark. Or one of those other Nordic bastions of comm'nism.)

"I don't know why I am bothering to send this to you, since I doubt you will even read it, let alone answer, but just in case, here goes.................." (Paraphrasing, a bit: it was a long time ago.)

I spent over an hour, hammering out a detailed response. I forget the subject, but he got his question(s) answered, in full and quite detailed.

So, he promptly replies:

"WOW! Not expecting any sort of answer, I got a lot more than I ever hoped for. I am really impressed that you would think that much about me, even though we don't get along, to give me that much of a reply."


"I answer all of my mail, and give full attention to each and every one of them. If someone puts in the time and effort, to ask thoughtful questions, they deserve the same in response." (Even though he didn't spend anywhere near 1 hour to type out his original message.)

He further thanked me, and commented that I was a much different person, out of public sight.

I explained to him that my posts, on the forum, might be a form of intelligence test.

(Vonnegut fans should be able to figure that one out.)

"We hate Malachi Constant because......................"

39
Analog Audio Stuff / Yeah, just what is wrong with op-amps?
« on: November 03, 2016, 04:20:13 PM »
(Or as the guy who told me about this: "It isn't about op-amps. It is about my dick is bigger than your dick!")

Well, not sure I would go that far, but..................

Anyway, over at DIYA, it is another Masters of the Universe vs The Peons food fight. And since we know who the Mods are........................yeah, not exactly a clean fight. (But, when where fights supposed to be clean?)

So, let me add my incoherent blathering...................(hell, why not?)

Mind you, I have only read the last few current pages, so keep that in mind. I'm sure there is a ton that I have missed, and I am only glad to have missed it.

OK, first.....................

I get telling someone "That is stupid. You don't want to do that."

I've done that, many times. But only because I know it is stupid, because I already tried it. Not because "I know more about everything than you do, because I am a Master of the Universe." (No, you aren't, actually. But, it is a free country, and you are free to pretend so.)

Every time I tell them something is stupid, I get attacked, from all sides. Usually by people who really are stupid. Rather than listen, they tell me I don't know what I am talking about. Which sounds funny, coming from people that really don't know what they are talking about.

But, anyway.................

Face it: some folks aren't going to listen, no matter what. Deal with it. But, no...............not the Masters of the Universe. They continue, on their high horse, bound and determined to stop anyone and everyone from defying their infinite wisdom and knowledge. Because, after all, that is what Masters of the Universe do. (Sounds a lot like politics, right? "I.............I..............I can't do that. The Constitution prevents me from doing that. It isn't like I am king, or something." And then they turn around and do it, anyway.)

"But there isn't any control!"

Well, yes, there is: a piece of wire.

If you take a piece of wire, and replace it with a long string of op-amps................if op-amps really do sound different.................well, multiply that difference by, say 20 x, and if it is something  that should be heard, if it exists, then you should then be able to hear it. (Not saying it does. It probably does. But, maybe not enough to be heard in singularity.)

Now, what is so radical, or earth shaking about that?

Well, nothing. In fact, it has been going in, at lots of high-end companies that I know of, for as long as I have been around that industry. So, want to try again, why it is stupid, is a waste of time, and must be stamped out?

AT ALL COSTS.

Because, that sort of thing never happens, in the real world. Why would you want to waste your time with that nonsense?

I guess none of them have ever seen inside of a mixing board.

Which is also why some recordings sound like crap. But, what do I know?

40
Teachers and critics
All dance the POOT.

Are we not men?
We are DEVO.

https://www.linkedin.com/in/jocko-homoe-1a7194130

41
Non-Audio Topics / Re: New feature: Ask Dr. Stupidus!
« on: October 18, 2016, 01:12:32 PM »
I don't get the need for a kickstarter. The rest of us just build something, and try to sell it.

Nothing like doing it with some other guy's money.

42
Which answer should I chose?

Uh.................I dunno......................the usual one................

Give up.

Or, maybe it is because you went to university, and got a "humanities" education:

https://www.youtube.com/watch?v=kM-GwZg19FQ

Which means you are equally qualified to work at Walmart, or design high-performance clocks, at the Walmart of DIY.


43
You boob!!!!!!!!!!!! / Re: Yet more subversion!
« on: September 15, 2016, 02:30:30 AM »
These 2 are for Phred. Even though he has no idea about any of this............

https://www.youtube.com/watch?v=3YJmUZXGxD0

https://www.youtube.com/watch?v=arzzNzv9k_I

44
Digital Audio Stuff / Re: They're talking about jitter......................
« on: September 14, 2016, 07:37:51 PM »
Oh, crap....................they are back on the vibration crap..............again.

Yes, you truly are a Fluke of the Universe. We are laughing at you.

Give up.

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