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Comparator with open collector "precise " hysteresis

a-slow 5 minute input transition, monitoring the output with a LeCroy Gsps transient capture- there was nothing- just an ultra clean switch. IIRC mini mum internal guaranteed hysteresis was 8mV.

been excellent.

The problem with Maxim was never the quality of their circuits, but getting hold of them in the first place, and getting hold of small production quan tities when you needed them - if ever there was company that encouraged the one-time-buy approach to purchasing, it has to be Maxim. Presumably if you could order your devices in production batch volume they would be a more a ttractive supplier.

--
Bill Sloman, Sydney
Reply to
Bill Sloman
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On a sunny day (Sat, 18 Apr 2015 00:29:09 -0500) it happened "Tim Williams" wrote in :

Can't you solder on those pins? How about point welding?

Reply to
Jan Panteltje

Sixty years ago I was building lots of tube stuff, mostly audio, Williamson and Ultralinear types. Had I realized how much the world would change I would have taken pictures. All I have remaining is...

Note the price ;-) ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

Do you know the date of that manual?

--
 Thanks, 
    - Win
Reply to
Winfield Hill

It's still packed in a box from our last move, but more bookcases are on order and I will finally get everything unpacked, and I will post some of the innards.

However, my guess on the date would be around 1955-58, my last tube amp was built ~1958, I built my first solid-state amplifier (class-A, Delco door-knob germanium, 5W) in '57-58, and a real 30W amp as soon as I hit Motorola in 1962, with RF power transistors ;-) ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

Yup. I had an RC-26 floating around, somewhere (with an absolutely decayed binding), no idea where it went. ARRL handbooks, too.

They're all online these days; e.g.

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Tim

--
Seven Transistor Labs 
Electrical Engineering Consultation 
Website: http://seventransistorlabs.com
Reply to
Tim Williams

I found this at a flea market:

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Note the NEW TO-3 package!

One logic gate cost about 15x a steak dinner (at the Buck Forty Nine chain.)

--

John Larkin         Highland Technology, Inc 
picosecond timing   laser drivers and controllers 

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com
Reply to
John Larkin

I have several editions of ARRL... the oldest versions are the best... real detail for construction of circuits and antennas.

Good link, thanks! ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

I really don't miss tubes. They were awful.

Some of the exotica, transmitting tubes and CRTs and PMTs, were pretty bits of glass.

--

John Larkin         Highland Technology, Inc 
picosecond timing   laser drivers and controllers 

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com
Reply to
John Larkin 

--
Sounds like pitiful whining to me, and a poor workman blames his 
tools. 

John Fields
Reply to
John Fields

They were pretty good up till the early 90s. My 1992 version is definitely better than my 1966 and 1976 editions. I haven't bought one since then.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net
Reply to
Phil Hobbs

I built my latest tube circuit in about 1993. I was doing an experiment in ionizing air with laser-produced plasmas, and built a little drift chamber that ran from about 1 Torr up to atmosphere (760 Torr). I needed to swing a grid from zero to about 750V and then let it go in a few tens of microseconds. By far the best candidate was an 811A, which worked great.

Eimac RF triodes are nice, and so are some of the stranger magic-eye tubes.

CRTs used to be amazing, before they had so many years of complete bilge presented on them. ;)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net
Reply to
Phil Hobbs 

--
Absolutely elegant! 

Spehro, you da man! :-)
Reply to
John Fields

A tube isn't a tool, it's a component. I designed tons of electronics with tubes when I was a kid. The first professional design that I did, for money, was a radiation counter with Dekatron tubes. Dekatrons were interesting, a decade counter and a display in a single part.

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What's to like about tubes? They are

Big

Hot power hogs

Fragile

Slow

Low Gm, terrible Gm/Cout ratio

Unreliable

Expensive

Tons of drift

Usually noisy

Microphonic

Not available in surface mount [1]

Design anything interesting with tubes lately?

[1] Hamamatsu makes and promotes a tiny SMT MEMS photomultiplier tube, but refuses to sell it. 
--

John Larkin         Highland Technology, Inc 
picosecond timing   laser drivers and controllers 

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com
Reply to
John Larkin

Couldn't use a mosfet? I have a similar project going on right now, a multichannel 750 volt pulser for some optical PLZT things. I think I'll use mosfets!

Some of the big transmitting jugs were beautiful pieces of glass.

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I like tubes as history and sometimes art, but they were mostly awful electrically, excepting exotica. I have a pretty nice collection, but to look at, not design with!

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Well, I might consider a tube for a, say, 30 kilovolt amp.

The audiophools seem to like the very worst tubes, like 6SN7s and

300Bs and such. 
--

John Larkin         Highland Technology, Inc 
picosecond timing   laser drivers and controllers 

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com
Reply to
John Larkin

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--

John Larkin         Highland Technology, Inc 
picosecond timing   laser drivers and controllers 

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com
Reply to
John Larkin

--- Simplifying Google's: "a device or implement, especially one held in the hand, used to carry out a particular function." to: "a device used to carry out a particular function."

singles out components (which includes tubes) to be a subset of tools, since they're used to carry out a particular function.

---

--- That doesn't mean you weren't a poor workman, it just means you managed to get the job done.

---

--- You're preaching to the choir.

---

--- So since you don't have a current need for tubes, they're the worst, but when they were all you had to work with they were the best?

---

--- Nope.

---

--- So what? That's just more of your neverending, irrelevant, self-promoting prattle.

John Fields

Reply to
John Fields

FETs couldn't get near the 811A's output capacitance, which iirc is about 5 pF.

Cheers

Phil Hobbs

Reply to
Phil Hobbs

On chip, I skip the switches and just swap input stages of the comparator by current diversion... screamingly fast. ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

That is obviously true. People built computers from relays, when they were the best available technology.

Relays are still, at times, the best available switches; tubes seldom are.

An electronics discussion group would get dull if all people did was bicker and spew lame insults, and never discuss electronics.

--

John Larkin         Highland Technology, Inc 
picosecond timing   laser drivers and controllers 

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com
Reply to
John Larkin

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