Syd, The 4538 is a single supply chip so I suggest you drive the line from a single supply as shown in the GO circuit. The line hangs electrically at a...
Good Morning Everyone, Comcast has bought out Time Warner here in the Houston area. As a result, Comcast will be shutting down all the personal web sites in...
Kareem, Chuck mentioned "closure". Well, I like closure, too. So... I really *am* happy to try and offer a word of advice now and then. And even though I do...
The LH0002 or HA-5002 buffer chips are the way to go for line drive. We have used em in cement bond tool receiver amps for a long time, but many modern pulse...
Syd, The LH0002 has three inputs, three outputs, and four supply connections for one driver. The can has one input, three outputs and four supply connections. ...
Nope, both pulse former outputs are connected to the single input, and it works like a charm. I am not smart enuff to tell you why it works... The HA-5002 is...
Good morning Sir many thanks for your interest , today i visited your nice website and got your free software , i have questin sir concerning the Archi...
Mr Elmasry, Rw is the resistivity of the formation water. Rwe is the "effective" formation water resistivity (ionic activity compared to that of mud filtrate)....
Oh! Yeah! That's right, too... rjz http://www.rjzpetrophysics.com ... the "effective" formation water resistivity (ionic activity compared to that of mud...
Hi Hesham, I think you must be referring to "RWA".., The difference is this: In log analyst's jargon, "Rw" refers to the resistivity of the formation water...
Sorry for the delayed response; been too busy to check wireline. Seems to me that a one-shot, especially those with included logic input (AND as well as NAND)...
Seems to me that all rules have exceptions, as well as all exceptions have rules? Anyway, it is perfectly OK and "common" practice to tie CMOS devices in...
There are two things i hate: 1) the fact that "yahoo" is klutzy and tosses attachments (most especially graphics), and 2) some damn reference that demands yet...
Puzzling; the schematic that Syd sent to me was totally symmetrical; same RC constants (120pF, 100K), Q outputs to a 4011, etc. ... monostable-multivibrators...
Seems like you have desctibed a better mousetrap - *with* the cheese! ... that the old system simply throws out. It's the short neutron pulse that happened...
A PCB with socket on top and pins below can be made to re-wire as one needs; the size is not much more than the original device. An octal tube socket and...
An old "rule of thumb" was to never load a DTL or TTl with less than 1K, with 10K being always safe. Now take N outputs, each with a resistor in series to some...
Comcast has supported (their) customers in the past; they are very *STUPID* to trash customers of a different network (Time-Warner) just because they are...
Not quite correct. There is one input, pin 3 (DIP) / pin 8 (can); that gives low in/out offset and maximum current gain to the one output, pin 8 (DIP) / pin 4 ...
Is there any technical or philosophical reason to favor an inverting or non-inverting op amp configuration in radiation tool preamplifier stages? I like the...
Syd, The non-inverting op-amp amplifier input impedance is theoretically infinite. So, it doesn't load down the circuit driving it. The inverting op-amp...
As Chuck pointed out there is an impedance issue between the two inputs. The inverting input is favored for nuclear counting because it can help suppress...
Fellow travellers..........I have been invited south of the border to investigate a coal mine explosion......with my downhole cameras. Having secured local...
Ray: Well dern. It figures I would pick the wrong one! I guess if you are connecting to an He3 detector, a JFET input op amp in non-inverting mode is a good...
Does the Warrior computer system have a provision for linearizing calipers? When you do calibration points, does it automatically linearize? If not, is there...
I have never had to interface to a He3 detector so I will have to plead ignorance on that one. I do know they are pretty high impedance devices so you are...
Thanks Ray. Syd ... From: Ray Ethridge To: wireline@yahoogroups.com Sent: Friday, August 03, 2007 6:02 PM Subject: Re: [wireline] Op Amps as Pulse Amplifiers I...
Fellow travellers..........I have been invited south of the border to investigate a coal mine explosion......with my downhole cameras. Having secured local...
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