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Request Switchcraft Inc. PL BUTTON-BLUE online from Elcodis, view and download PL pdf datasheet, More Switches & Relays specifications. Monkey II LTE User manual details for FCC ID 2ALJJPL made by PCD, LLC. Document Includes User Alternate Views: PDF [Zoom] Download [PDF]. STAR SYMBOL DE NOTES CRITICAL DIMENSION. THIS DRAWING DESCRIBES A DESIGN CONSIDERED PROPRIETARY IN NATURE, DEVELOPED AND.

The interdisciplinary contributions from several areas such as materials science, chemistry, and physics, combined with biology, pharmaceutics, medicine, and environmental science have created a fascinating new class of hybrid nanomaterials or nanoconjugates.

These nanomaterials can be designed and engineered with almost any property or to carry out almost any function [ 2 ].

page sheet date

Basically, these nanosized conjugates combine the intrinsic functions of inorganic semiconductor nanomaterials and the versatile organic biointerfaces offered by polymers e. In the realm of inorganic low-dimensional materials for producing nanoconjugates and nanostructures, QDs have been the major choice because of their unique combination of optical, electronic, magnetic, and chemical properties, which can be tuned via the modification of the nanoparticle size below the threshold value, named the Bohr radius [ 1 , 5 , 6 ].

In particular, the interest in narrow-bandgap materials such as bismuth chalcogenides e. Studies from around the world suggest that these materials are realistic prospects for applications including solar cells, infrared optoelectronics e. However, due to their extremely low dimensions at the nanoscale and exceptionally high surface-area-to-volume ratio, these fluorescent nanocrystals must be stabilized by capping agents during their synthesis to restrict the growth of formed nuclei [ 10 ].

Hence, QDs have been produced using numerous processes such as in the pioneer studies entrapped in glasses [ 11 , 12 ] or molecular films [ 13 ], encapsulated in polymer nanoparticles [ 14 ], dispersion in organic solvents [ 15 ], and colloidal dispersions [ 16 , 17 ].

Nevertheless, despite almost three decades of advances in QD synthesis, the majority of the reported methods rely on organometallic processing routes that employ toxic solvents at high temperature and that lead to the formation of nanocrystals with hydrophobic surfaces [ 1 , 5 , 18 ]. Thus, synthesis of semiconductor QDs using an aqueous colloidal process is an attractive alternative to organometallic routes, which have received increasing concern because of their use of chemical processes that can be harmful to humans and to the environment [ 17 , 19 , 20 ].

In support of this, new environmentally friendly processes for producing QDs have been reported recently in the literature. Most studies employ the use of water-based colloidal routes using environmentally friendly and biocompatible reagents and precursors at low temperatures [ 17 , 21 ].

In addition, colloidal chemistry provides a flexible platform for the surface functionalization of the QDs by applying an appropriate capping ligand, which in turn can simultaneously stabilize the inorganic semiconductor core of the nanoparticles and form an organic shell with biochemical functionalities for further applications [ 19 ]. Among several alternatives for capping agents, biopolymers, such as chitosan and its derivatives, have recently been proposed as a greener nanoplatform for producing water-soluble quantum dots.

These polymers are intrinsically biocompatible, and they can be directly used as ligands for stabilizing QDs in aqueous media [ 22 ]. Chitosan is a natural biopolymer that is commonly produced from the alkaline deacetylation of chitin, which is mostly extracted from the exoskeleton of marine crustaceans. As a biopolymer, it has been broadly used in numerous biomedical and environmental applications due to its biocompatibility, biodegradability, commercial availability, and worldwide abundance associated with its eco-friendly properties [ 20 ].

Surprisingly, few studies have reported the preparation of nanomaterials based on bismuth sulfide Bi2S3 , such as quantum dots [ 7 ] and nanorods [ 9 , 23 ], but no research investigating Bi2S3—chitosan nanoconjugates was found in the consulted literature.

The results demonstrated that chitosan was an effective polymer ligand for nucleating and stabilizing ultra-small Bi2S3 QDs, forming colloidal core-shell nanostructures in aqueous dispersions.

In addition, it was verified that variation of pH and molar ratio of precursors during the synthesis affected the physico-chemical properties and morphological aspects of the nanostructures. Moreover, these water-soluble nanoconjugates were photoluminescent under light irradiation and biocompatible toward SAOS cell culture, which can be potentially used as narrow-bandgap fluorophores in biomedical and pharmaceutical applications using an environmentally friendly process. QD sizes and distribution data were obtained based on the TEM images by measuring at least randomly selected nanoparticles using an image processing freeware program ImageJ, version 1.

Vanaf het bouwen,instellen en testen heeft het project mij veel plezier bezorgd. Je heb er echt iets moois van gemaakt.

Het apparaat functioneert naar wens en voor mij is hij goed zoals hij is. Het enigste wat ik mis is een hogere negatieve rooster spanning,zodat ik B buizen kan testen. Nu doe ik dat door de anode spanning en dus de NRS ook laag te nemen. Het werkt. Is het ook mogelijk om voor de NRS een externe voorziening te gebruiken? Die heb ik n. Aldus nogmaals mijn dank voor dit bijzondere apparaat. Met vriendelijke groet, John Schenk.

After working with tube amplifiers for some time, I found my shack filling up with tubes, some of them deteriorated, some broken. Time to find a test-device and sort what is what! Well, let me tell you, it is an excellent choice! Already the unpacking after receiving the uTracer kit is a great joy, you can see that a lot of thought and love has been put in putting the kits together. Most of the components sorted and labelled, semiconductors neatly stuck in foam, a great looking PCB with two SMD parts already on it.

And extended documentation, which takes you step-by-step through assembling and testing the sections that make the uTracer. The kit comes without a box, making you think of how you are going to use the uTracer and what type of box fits your needs.

There are many examples out there to get you going, so that should not stop you. The development of the uTracer does not stop, thanks to the effort of Ronald and the community enhancements are designed, as well as new ways of using the uTracer thought of.

All in all, a great kit and a great building experience. I would give it 9 out of 10 points. Together with some friends they also organized a Swedish uTracer test! Hello Ronald, So, finally I managed to take a couple of pictures of my u-tracer build and installation. I mainly do simple service of guitar amplifiers and did a little shortcut in the socket layout of my build.

That pretty much covers virtually all tubes I will encounter. No internal patching possibility therefore. I attached the plastic box with the u-Tracer on the wall between two shelves above my working table. Works good enough for me. To conclude the u-Tracer is really a helpful tool for me and will quickly tell me the condition of the tubes in the amplifiers that I work with and also extremely helpful when selecting new power tubes matching or selecting a suitable preamp tube specifically for a certain role phase inverter for example.

The u-Tracer was easy to assemble as the instructions were excellent and clear. So finally thank you for your excellent work on the Tracer and to make it available at an affordable cost! Greetings from northern Sweden. I cannot wait for the boxed version! Hello Ronald, I have your pcb being edited It was easy because of your detail manual.

I will create socket box. Hello Ronald and friends! It is very nice to write You for a very long time. And thanks for the very well working uTracer. So here they come, hopefully You mail does not fill. Settings are EL You can see from pictures, that I have not made the other raw of banana plugs down.

When it comes two or more connections to same plug, I just put them together to same banana point. It has worked so far and I have not seen any oscillation or so. The V parts are still waiting in the box some good day, job is small, but beginning is big.

Please visit also the description on his website in French. It worked perfectly after each stage of construction, the assembly instructions are very well done and if we follow it step by step, the result is guaranteed. The bulk of the work is to make this circuit convenient to use. I chose to put it in a suitcase that is easily found on the Internet and have a simple and scalable system for the tube supports.

I have dedicated a page on my website in French! Finally I finished constructing my device. Your manual is great, it is very easy to construct uTracer with help of your manual and advices. It took me so long to finish cause unfortunately I have little time for my hobby. My uTracer is ready for work now.

You can find some photos of it attached to this letter. To make connections easier for me I used cards with color-codes. You can see examples on my photos. Thank you for your very well-done job Cincerely yours, Aleks from Russia, Moscow 4th of Noveber Eric van der Velde finished his very nice and compact uTracer!

Next will be a complete tube audio amplifier using no semiconductors at all. But how to select the best tubes from the junk box? For me it is old school technology. I was grown up with semiconductors and processors.

Via the web I found the uTracer website. Really beautiful!! A great design, so I ordered a kit. Many thanks to Ronald for the technical work and Marie-Jose for the logistic support.

Delivery was very fast and the kit was very well packed. In the junk box I've found a nice case. But it is not very big so a real challenge to have all components fitted. Especially the height was a challenge. I had to do some mechanical work. Because additional to the uTracer printed circuit board there is an old laptop power supply, two step down converters one for the 1.

The 5V is used for the small home brewed interface. I used some old TTL ic's to make the combiner for the interfacing. Just connect and select the right COM port in the software. On the rear there is a male 9 pin outbreak connector to connect small cases with less common used tibe sockets. I use small plastified cards for the connection diagram. Quite simple. The construction manual is very well documented. The uTracer worked at once. Other EL84 tubes had an Ia of more than mA.

So it is very interesting to play with this beautiful tester.

Most ECC tubes in my junk box have identical curves for both triodes, but I found also some with great difference. Many thanks for this great tool. Kind regards, Eric van der Velde pa2reh - Netherlands.

Their soft glow has always fascinated me. When I was 5 or 6 years old, I admired the magic eyes on old broadcast band MW radios, with the soft red glow in the middle. Looking at the back of the radio was much more interesting than the front: one could see all the tubes glowing and appreciate the wonder of producing music from invisible radio waves, just by guiding electrons through a vacuum!

So much fun!

Could this tube do more than what Heinz Richter told me in the manual? I grew up, semiconductors took over, I became a physicist, work was exciting and took all my time. Then my wonderful family with three sons became the focus. I had always wanted a tube tester, e. I looked at old commercial tube testers now available on site and various kits. I also liked your impulse measurement technology, as it allows to measure outside the safe operating range of tubes without danger to the precious tube.

A few years ago I got a kit for Christmas from my wife and oldest son. That was so wonderful, what a great gift!! I searched on site and luckily found the front of an old self-built tube tester with a lot of sockets in it. Recently, I managed to set some time aside for my tube hobby; I assembled your kit, which worked fine on the first try.

Impossible to overlook now??. Then I had to build an enclosure.

Wells PL504 Parts List

Oh well, it is a test gear, not living room furniture. It is so much fun to work with it!! I can now trace the EF98 in triode mode, at various anode voltages outside the recommended range, find out how it behaves with g3 connected to cathode while g2 is connected to the anode, etc.

I am enclosing a few pictures and if you want to put this on your testimonial page you have my permission!

Hi Ronald, I finally sorted out the issues I was having with the negative supply and now have the uTracer up and running. Although the resistor work around did sort of make the issue less scarce, it didn't fully eliminate it and I burned through another set of OPAs! I opted for a vertical "Manning" type layout and I'm quite happy with the result.

It's a great compact design and it totally suits my needs. Oh, and please ignore the ugliest solder mask you've ever seen! I had the transparency done up at a different print shop than normal and unfortunately the toner wasn't dense enough. I've included some directions. Thank you for creating this device!

After a few months, I'm quite excited to finally spend some time with it! It took a while to get started on the build as there were a few other projects in line ahead of it, but now it is complete. It went together very easily, and frankly was a lot of fun to build. I almost wish I had another one to assemble considering how enjoyable it was. I was very pleased with the quality of the PCB and the active and passive components you selected for the kit. Overall, it is an outstanding product.

I put together a tube socket box with basic four through nine pin sockets. I may add a few other socket types in the future. I used banana jacks and cables similar to what was shown in the construction manual. I had a notion of putting together a computer driven relay matrix to switch the sockets, but decided against it once the cost in both time and money became apparent.

A project for another day, perhaps. The curves agreed very closely with the RCA data sheet for the 6AU6A, confirming that the tracer works and the tube is still functional. That tube has to be at least fifty years old. That it still works was a big surprise as it has travelled everywhere in my electronics junk box over the years through several homes I have owned, and has not received the best treatment.

PL504 Switchcraft Inc., PL504 Datasheet

I do have one question, that being are there any plans to make the user manual available as a pdf file at some point? It would be handy to print out and place in a binder. Thank you again for putting together such a fine kit. Hi, I'm Luigino Giuliani, First of all, I wanted to thank you for the repair of the u-tracer that now works perfectly, now I wanted to ask you some advice.

I kindly wanted to know the setup parameters for the test of a double triode type 12AX7 or similar, moreover in the fast test of the EL84, by entering the parameters as in your manuals, the anode voltage goes up to 50Volt also exits a warning as photos attached, I state that I popped up for tests at Volt. I enclose a photo of my prototype for an evaluation. Hi Ronald, I hope this email finds you well.

I successfully built the uTracer, and it works great. I learned a great deal while building it, and now I look forward to expanding my understanding of the operation of valves.

Attached are some pics. Hello Ronald, greetings from Miami! I hope that you had a nice and deserved holidays! I am happy to report that yesterday I finalized the basic assembly of the components on the pub for the utracer. Measured values obtained during construction were similar to those included in the manual.

Good job with the manual! I will temporarily connect a tube socket today and run my first test.

I also bought a plastic case water proof that I am planning on using for the final assembly of the utracer this will take me longer time. Calibrations were also easy to follow and to perform. I did a small mistake that was detected on time and everything went smooth after that. The only issue I am having is with the calibration of the grid bias circuit. It was relatively easy to calibrate it for the , -4 and The values are spot on after calibration i.

However, when using the Vgrid sat to calibrate the low values I had to go all the way to the lower end of the slider left to get close to the desired values but I can not get to them.

This values are the closest ones I can get with the slider all the way to the left, see screenshot attached. For It is remarkable that my slider is all the way to the left. I saw on line the calibration screen of other builders and their final setting for Vgrid sat is closer to the middle of the range, meaning they have a better control of this parameter over and below the desired value this is not my case.

I will keep you posted with any future progress. Receive a big thank you for putting all this together for us! Good Evening Ronald and Maria Jose! The uTracer is alive and working just fine. The attached photos show a 6BQ7A under test. A bit of an odd tube, but it was the nearest at hand. Here are some additional photos of the test and enclosure. The only thing I have a question on is why the HV light stays on after shutdown.

It turns off after I disconnect the USB cable. I want to thank you so much for the great enjoyment this has brought! I am thrilled to say that I was able to put this together without any errors along the way - pretty good for a guy who usually just works on point to point. I attribute this to having developed pretty good soldering skills over the years and my Weller WS solder station but way more so to the efforts of Ronald Dekker in providing a damn near bulletproof assembly manual and continually seeming to make things easier for the assembler - I noted several kit items that were obviously improvements on the original build manual, example, the now looped inductors.

I set up a crude valve base to do some tests on real tubes as the final product for this thing is a ways off - mainly because my parts order out of China seems to have disappeared in the mail.

I have included some photos of my testing and my lab as it is. I am an old guy who understands a fair bit about electrical theory but I am super appreciative again to Ronald for doing all of this legwork with the GUI to make all of these calculations automatic and believable.

I got really good results from a new JJ 12AX7 compared to spec and have tested two 12AU7s, one being British and showing much more life than the other RCA - both tubes still very usable according to uTracer.

This thing will be awesome for matching. It is not perfect but for free I am not going to complain. I will say again that it sure is awesome to have someone like you in this world who comes up with something like this, offers it to the world for cost in my opinion and worth every thin dime , continually improves upon it, will support it although I did not need to ask you anything because you have done an excellent job of documenting all of it including FAQ and Notebook on your website and simply wants to share it.

We need many more like you good Sir. Once I have the final product completed I will send you some photos. I have a nice, like new, instrument mechanics tool case here and intend on it having a Weidmuller 24VDC power supply internal to split to the uTracer and also to provide a higher amp filament supply. It will be a bit of a challenge to get all of it in place but the hope is that I can test 6 different tube bases guitar focused and have the mini HP netbook fit in a compartment so the thing is totally portable.

It should be practical, functional and pretty when it is done - that is the vision, maybe not the end reality! Thank Man, you rule for certain. Jeff Brooks 11th of September Stephen Kraig made a posts concerning the uTracer on his website, he also made a podcast! Check it out! Hi Ronald, I just wanted to give you heads up that the first two posts about my uTracer upgrade are live on my website analogeng.

In one of the last emails I sent I said that I would be using circuitchat. The first post introduces my upgraded uTracer and the second begins to break down the circuit design.

I have a third in the works that discusses the code which I hope to have out soon. This link is also in the posts. The website is still under construction so it is a bit rough but I have plenty of content that I am working on that will help clean it up and fill it out. Thanks a lot for sharing everything! Stephen Kraig Ronald, As a secondary note, I am a co-host of the MacroFab engineering podcast a weekly podcast that covers a wide variety of topics involved in engineering.

For the past handful of episodes I have spoken about the design of this project and the details surrounding it. Stephen 30th of August Stephen Kraig actually did what most people dream of, he made a relay matrix to connect the tubes! Absolutely stunning! Ronald, I want to start by thanking you for creating the uTracer. I downloadd one years ago and have used it extensively since.

For a few years I ran a business designing and manufacturing guitar amplifiers along with performing repairs for local musicians. The uTracer was certainly a tool that stayed on my workbench as I used it regularly.

I originally had the pcb in a plastic enclosure that was drilled out somewhat sloppily and assembled quickly. I used the banana jack solution for configuring the tube sockets as many other have done and although everything worked well I had always wanted to design a better solution and one that looked nicer at the same time. Over the last few weeks I redesigned and rebuilt my enclosure and put together a carrier PCB that interfaces with the uTracer and makes configuring the tube sockets easy.

Here is an image of my new uTracer please excuse the image quality. I am an engineer and not a photographer. My idea was to package the uTracer in an enclosure that contains all of the tube sockets that I normally use and to give the user a convenient way to configure the signals that are sent to the tube sockets. To do this, I designed a PCB that contains 9 seven segment displays, 9 rotary encoders, and an array of high voltage capable relays. The user can configure each pin for what connection they want by turning the rotary encoder under the pin number and pressing the encoder to accept the connection.

When the user selects their option the onboard microcontroller will trigger the appropriate relays and make the connections from the uTracer pcb to the tube socket.It could also provide multiple connections to an electrode of a simpler device where useful, as in the four connections to the grid of a conventional grounded-grid UHF triode, e.

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That was so wonderful, what a great gift!! Sometimes the shield was also fitted with thermal contacts to transfer heat from the glass envelope to the shield and act as a heat sink , which was considered to improve tube life in higher power applications. Already the unpacking after receiving the uTracer kit is a great joy, you can see that a lot of thought and love has been put in putting the kits together.

Because I am mainly working with audio equipment and I am using the most common power and pre amplifier tubes I went for a simple build with no switchboard. I learned a great deal while building it, and now I look forward to expanding my understanding of the operation of valves. Looking at the back of the radio was much more interesting than the front: one could see all the tubes glowing and appreciate the wonder of producing music from invisible radio waves, just by guiding electrons through a vacuum!

I am an engineer and not a photographer. It should be practical, functional and pretty when it is done - that is the vision, maybe not the end reality! So, I ordered a kit from you right before the Holidays and virtually as soon as I did that I also managed to snag an emissions tester at a price near its worth because it was in need of some TLC Tender Loving Care for those unfamiliar with idiomatic US English.