diffamp with Vcc = 0

Sonnuva gun! Freshman student Larkin is just now (?) discovering what all the rest of us knew >:-}

Anyone who has curve-traced a transistor knows that!

Next Larkin will proclaim surprise that a grounded base transistor configuration, with base tied to ground, can swing below ground.

Sonnuva gun! ...Jim Thompson

voltages.

collector

This IS a circuit DESIGN discussion group, is it not?

If Larkin wants to proclaim "cute", let it be on sci.electronics.basics ...Jim Thompson

voltages.

collector

Given Larkin's heavy use of PECL, ECL and CML, one might even make a case for plagiarism >:-} ...Jim Thompson

voltages.

the

collector

Most classic 10K ECL parts would malfunction if a logic input got close to ground. Nominal logic high was about -0.8 volts, and most would fold over at -0.4 or so. Newer parts generally accept ground as a logic high.

Jim isn't interested in discussing electronics. He only wants to shout how smart he is, or, preferably, how dumb other people are. Note that his posts seldom have technical content. Do you think that's cute?

I'm still playing with the mosfet power dissipation multiplier idea, the realtime analog SOAR computation.

voltages.

the

collector

Sticking to technology, look up CML. Larkin mis-addresses (probably purposefully) the topic. The discussion is in regard to collector-base potential.

Larkin still hasn't figured out how to undo the 90-degree locking feature... now THAT is really cute >:-} ...Jim Thompson

Got any good techniques to remove rust stains from ceramic floor tiles?

--

John Larkin Highland Technology, Inc

jlarkin at highlandtechnology dot com

Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation

I can't help it if they're dumb.

"Cute" is a royally dumb-ass statement. ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

As others have pointed out, Naval Jelly works... it's phosphoric acid solutino, with a gelling additive.

I've heard of people using oxalic acid, citric acid, and ascorbic acid (Vitamin C powder) in the same fashion. They all reduce the rust to a more soluble and less colored form.

All of these have some ability to etch concrete and probably other ceramics. The liquid phosphoric acid solution I use to de-rust tools is also advertised as a "concrete etch" to be used before painting, and it really does make the concrete foam aggressively when it hits! Glazed tiles may be less vulnerable, but you never know! It would probably be a good idea to test any such acid in an inconspicuous corner of the room and see if the tile suffers from any etching which would be more unsightly than the stain. You may find that the tile survives OK but the grout is damaged, and would need to be cut out and replaced.

(In other words, mount a scratch monkey before running diagnostics :-)

Really severe cases may have no solution which doesn't involve the use of a grout saw, hammer and chisel, and a set of replacement tiles.

That was just an interesting aside to this:

It doesn't need a negative power supply, and power dissipation is tiny in the PNP pair - Vce is tenths of a volt - so self-heating won't cause any errors to speak of. Works pretty well in simulation.

I'd be wary of trusting the models provided by LTspice... they tend to be too perfect.

As I noted in a comparison posted in...

Subject: Re: spec out low power bjt Date: Sun, 12 May 2013 10:31:52 -0700 Message-ID:

I'd use device models from the manufacturer.

A quick check of a 2N3906, running at IC = ~20uA, would indicate you need about 0.3V VCE to allow around a +/- 0.1V swing without hitting the "knee", which fits with my general rule of thumb of 1/2 Vbe.

Cascodes are another animal altogether... you can push pretty close to VCE = 0.1 on the cascoded device without problem. ...Jim Thompson

No, I don't have rusty floor tiles; Jim does. That's about all he has to post about any more, that and redneck political rants.

I never understood why anybody would want an aquarium. Fish are messy and not very affectionate.

Strange accusation, since the last few posts of his I glanced at,

Ya, I saw Jim's post after I made my post. I have no interest in having fish, except for dinner. However, to each there own. Like my wife, she loves to spend hours picking weeds out of the lawn, me, not a chance. Mikek

Then you have selective vision.

Jamie

Either Larkin, and his Pecksniffian echoes are either misinformed, or are liars.

In the past 4 years I've posted 948 links to schematics on my website (with component values :), 42 in the last few months. (464 Schematics are still available on the site.)

I've also posted 34 links to other sites to provide answers to questions that were posed here.

I've also posted 114 device/transistor models that people were having trouble finding.

Also 38 subcircuit/behavioral models.

Where the real designers with a real interest in electronics hang out, the LTspice/SwitcherCAD III Group, I've made 81 posts in the last year. That's where John Woodgate now posts.

Larkin says, "Jim isn't interested in discussing electronics."

That's patently false. What hurts his little-bitty feelings is any criticism of his sketches (without component values :). In fact, I can't recall ANY schematic posted by Larkin the included values. That's how he avoids (or try's to avoid) any criticism or VERIFICATION

Now that I've made my spiel, I'll shut up.

Except, please note, Larkin's "technical" posts will continue to be criticized where appropriate, irrespective of any snarky responses from Larkin or his sycophants.

Snarkiness will be ignored. Larkin thinks his snarkiness impresses. (Probably only his sycophants.)

I do note a Larkin success: It appears that he has scared off a large number of lurkers from posting, for fear of a Larkin-dump. I get several E-mails a week from people whose names I don't even recognize, requesting circuit assistance. Recently I've even been getting phone calls for help.

If any of you wish help, just E-mail or call. I always respond... it's fun ;-)

I'll be re-writing my webpage mail-box to delete the reference telling students to come here for help. With the likes of Larkin and his sycophants, this is the worst place for a novice to come. ...Jim Thompson

Hilarious. If I post a sketch without parts values, Thompson is helpless to figure out if it can work or not. He can't understand circuits using his own brain, and can't figure out working values for himself. Apparently all he knows how to do is plug Heathkit circuits into Spice and see if they work.

Worst of all, he won't play the circuit game, won't contribute positively to evolving ideas, he has no ideas, and he posts nothing original. He's sort of a monolithic silicon technician.

Unlikely.

Try posting a schematic in even so much as what is considered to be an acceptable rough draft format, and we'll shut up.

Even the roughest 'guesstimator' puts in rough default starting values.So even your argument in that regard falls flat on its face.

But I wouldn't know the first thing about philosophy, since I am universally philtered.

knows

Sounds like you can't visualize circuit function either. That's OK, most people can't. Like most people don't know the difference between a watt and a joule.

After looking at, designing, adjusting, testing, and proofing tiny GHz tank circuits and strip line features in 0204 form factors on mil 'blade' paradigm circuit cards, I think I have basic visualization down, since none of those parts are marked and circuit pathways are easy to follow on RF schematics. Not so easy on PWAs where most if not all of the traces are on sub-surface layers.

Those are very dense circuit cards too. Full of expensive, specialized filter, amp, and stimulator/synthesizer modules, most not much bigger than a low profile matchbox. All surrounded by tiny 0402 and 0201 parts, making servicing and setting up test pathways a real joy. All on a card that is about 5" x 7".

The big blades I work on are like 10" x 11" and go into big Radisys chassis (commercial gear so I can talk about vendors). Those are our designs.

We also buy huge HP blade server chassis and fill 'em up with $5000 Dual Xeon server blades for about 24 cores worth of processing on each blade, and we get their 1U and 2U computers too, which are really nice pieces.

And we buy 10Gb/s Juniper Optical fiber fabric chassis and blades which are even bigger at like 18" by 12". Those are in the $ hundreds of thousands each range. Hell, each optical port is $1000.

I think I can visualize a circuit path, Johnny. I work with the most cutting edge circuit pathways on the planet (and through its airwaves).

A watt expresses a rate of consumption. As in how much work is being done how quickly, i.e. "rate of consumption". Should correctly be referred to as "watt hour", verbally speaking. In math, the watt/hour.

Whereas a joule is usually an expression of the entirety of the amount of energy an observed event consumed. In other words, how much work was done.

Try again, child.