PIEZO Transformers

[Ken Smith]

In article <_svJe.1619$zr1.390@newssvr13.news.prodigy.com>,
Joerg <notthisjoergsch@removethispacbell.net> wrote:
[...]

It wouldn't be a concern if it never has to idle. In my case some of the
stuff I design does not have a power switch so things have to drop to a
few uA when not in use. That rules out most classic circuitry.

Agreed.

I have seen a J105 used as the pass element in a linear regulator for this
reason. They have enough gm to make the terminal impedance low enough
even with a very low gain cross over for the regulator circuit. The
circuit is question was a RAM that needed to remember when the rest of the
system was off.

BTW: You can also make a booster with an LM555. If you hook a zener onto
pin-5, you can do it with just the 555 and a transistor no added op-amps
needed. As far as idle power goes, its worse than the LM339.

So far I have never used a 555. Never really seen an advantage in doing
that since a Hex Schmitt or something like that can do it for less.

It was a junk box project and I had the LM555s. Pin 3 of the LM555 has a
lot more drive than a logic chip and will run on 12V.

[...]

Sure he doesn't read usenet? Many of these threads are ported onto sites
on the web. Once I searched up and down the web because I couldn't get
an answer here in the group. The only thing I found was umpteen web
copies of my own post.

I figure the odds are so low as not to matter. Besides I know where the
bodies got burried.

That all calls for a solution that can live with jelly bean parts. More
than a decade ago a slick sales guy tried to convince me to use "modern
logic". After I balked at the cost he said that my CD4000 logic is going
to be dead in just a few years anyway.

You still can't beat the CD4000 series for low power. The 74HC parts get
close but you have to limit Vcc somehow.

I am still designing in CD4000

I don't think I'd design in a CDP1802 today buy you can still buy them
freshly made. Considering what an awful processor it is, there must be
some major demand other than replacement parts for the Minute Man.

and the mfgs even ported most of it to newer and smaller TSSOP packages.
They wouldn't ever do this in a situation of declining sales. So, I
guess that sales guys was very wrong.

I don't ask my barber if I need a hair cut and I don't ask sales people if
the competing technology will stay around.
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kensmith@rahul.net forging knowledge

 

[Joerg]

Hello Ken,

You still can't beat the CD4000 series for low power. The 74HC parts get
close but you have to limit Vcc somehow.

However, HC runs down to 2V at reasonable performance. CD at 3V somehow
runs but it feels like driving on a flat tire. AUP is cool since it
still rocks at 1V. There just aren't many kinds of devices available
although the ubiquitous inverter is there. That or a Schmitt is really
all you need in many semi-analog apps. I am waiting for AUP prices to
drop but it needs more sources for that.

I don't think I'd design in a CDP1802 today buy you can still buy them
freshly made. Considering what an awful processor it is, there must be
some major demand other than replacement parts for the Minute Man.

Reminds me of someone who told me about a design review. An engineer
said that this ECL stuff wouldn't last ten minutes without more heat
transfer. Response: It doesn't have to. From launch until impact it's
always less than two minutes. After that, who cares?

and the mfgs even ported most of it to newer and smaller TSSOP packages.
They wouldn't ever do this in a situation of declining sales. So, I
guess that sales guys was very wrong.

I don't ask my barber if I need a hair cut and I don't ask sales people if
the competing technology will stay around.

I don't either, this guy just tried a hard sell on me. Didn't work. What
shocked me the most was that he had no clue about how the legacy logic
his employer produced really worked. All I needed from them was a
document about input properties. He was unable to furnish more than the
scanned-in "data sheets" which I already had. So, I had no choice but to
"dis-release" that particular manufacturer. They lost pretty big biz
because of it.

Regards, Joerg

http://www.analogconsultants.com

 

[Ken Smith]

In article <UZFJe.1777$zr1.204@newssvr13.news.prodigy.com>,
Joerg <notthisjoergsch@removethispacbell.net> wrote:
[...]

document about input properties. He was unable to furnish more than the
scanned-in "data sheets" which I already had. So, I had no choice but to
"dis-release" that particular manufacturer. They lost pretty big biz
because of it.

We call that "dis-qualify" a supplier. Its been a while since I've had to
do that. The last was Intersil.

Just before ICT transfered thier PLD products to Anachip, they came around
looking for new product ideas. They new that they could not compete on
larger parts.

I suggested a few things. One suggestion was that the input's 0/1
boundary be well known on at least some inputs. Another was that they
make at least some outputs very strong. They took neither.

BTW: ICT's "place" is still the best progamable logic program in the
known universe.
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kensmith@rahul.net forging knowledge