48v power supply schematic heaven,free horoscope by jennifer angel,indian astrologer pandit ajai bhambi,horoscope astrology planets symbols - PDF 2016

04.09.2014
If you are not familiar with phantom powering, you should read my previous article on the subject here.
Note that the LM2585 design has a surface-mount LM2585S on the rear.  This is just about the smallest surface-mount item I am prepared to solder by hand!
This is calculated by taking the quiescent (no load current) as a baseline and then calculating the efficiency of the conversion of an additional 10mA of output current at 48V. Secondly, pay careful attention to the voltage ratings of the electrolytic capacitors as shown on the schematics.  If you over-voltage an electrolytic it will overheat and its useful life will be severely shortened.
I think a friend had suggested a LED and I have been planning on pilot light like on a fender lamp. The very large caps in the high voltage are a legacy from mine and a former mentors original design goal of making a simple tube mic preamp with a overbuilt power supply. Join Date Aug 2006 Location Lancashire Posts 622 Originally Posted by mike_mccue Do you think the 33V 0.5W zener diodes are more like very best practice or is it a routine addition? Like most 3-terminal regulators the LM317 is only rated for 35V maximum voltage across itself (it might be a little higher in some models). Since you're designing a 47V supply your input voltage will certainly be more than 35V, and at switch on the LM317 will have to withstand it! Adding a zener in parallel prevents the voltage across the LM from exceeding its ratings, by providing a short-cut path for charging the output capacitor. If I add the zener and the tantalum caps as suggested above it by tedmich it seems like the layout will be more complicated than I had imagined. I'm rethinking my original plan to mimic a bias supply and use discrete components to build a 48v supply. I like to build little eyelet boards and I was already stressing working with the LM317 hole thru components. Join Date Apr 2008 Location PDX Posts 2,881 Originally Posted by Merlinb Standard practice. If, by chance, the idea of the tube rectifier was to provide warm-up time for the preamp tubes and minimize cathode-stripping, that function can be done with a series inrush current limiter in the AC line input. I went and read about the LM317 full layout on datasheets and understand tedmich's above suggestions now. Here's is a schematic that just focuses on using the 50vAC bias tap to get 48vDC with components I may find easier to assemble. I learned a lot about the LM317 but I'd like to finish the original idea of working with discrete components which I was working on before I was introduced to the idea of them so that I can consider which is better suited for my DIY project. However, if you're going to use a simple 10-20mA zener design then you might as well just supply the zeners directly from the B+ supply, rather than a separate half-wave rectifier.
I value your opinion about the half wave and the suggestion to move the connection, but I already have the transformer and purchased it because it had the 50vAC tap.
I've uploaded the revised phantom power schematic as well as the latest power supply schematic incorporating the protection diode and caps for the LM317HV. I still maintain that the tube rectifier is a waste of time, but if it makes you feel better to use it, it's no big deal. My concern with the LM317 is that I am not experienced working with small heat sensitive parts and small traces on hand made PCBs.
I really enjoy working with eyelet boards that I make on my workbench and working with larger easy to see stuff. I take your opinion about the tube rectifier at face value and agree that your reasoning is correct. Join Date Aug 2006 Location Lancashire Posts 622 Originally Posted by mike_mccue My concern with the LM317 is that I am not experienced working with small heat sensitive parts and small traces on hand made PCBs. Join Date Aug 2006 Location Lancashire Posts 622 Originally Posted by mike_mccue I am speaking of my solder and assembly skills.
Do you think I can spread the legs of one to accommodate a fit with a eyelet board made with garolite and keystone eyelets?
I imagine the minimum spacing for the eyelets is wider than the standard package meant for PCB thru hole mounting.
If you can't spread the legs then you could just bolt it to the chassis and use wires to run to-from the board.
When I order a few LM317AHV will I also need to order a few heatsinks as well as insulators? Can some one take a last look at the most recent schematic *20a.gif to see if I got the Phantom power correct finally?
Many of the most popular PCBs and kits are back in stock, such as the Aikido Noval and Octal stereo PCBs, the and Aikido 12Vac, the Unbalancer, and the LV-Reg. No doubt the four 6DJ8 tubes sounded better than did the solid-state line stage that these customers had been using prior, else they wouldn't have been so pleased with the improved sound. The Aikido 12Vac PCB got a smaller change: its heater string is now protected by two zeners in series. One big problem with 12Vac and 18Vac wallwart transformers is that they offer poor voltage regulation, with the danger of applying too much heater voltage. Speaking of single-ended tube power amplifiers, one reader wanted to know why I was seemingly so down on the four-300B OTL amplifier that puts out 1 watt, which was designed by Bruce Rozenblit, and which I covered in my review of Bruce's book, Tubes and Circuits. An odd e-mail; it was almost as if the writer were pleading with me, beseeching me, entreating me to endorse the project, so that he could have permission to build it.
I was once at a listening session with a few close friends and we all felt that something was off the mark. Okay, back to 300B OTL amplifiers, I asked the reader what he thought of my Somersault OTL variation, which would quadruple the output power, but I received no reply. We could apply the same logic to the my Somersault circuit, which is a push-pull, class-A topology, which doubles the output current swing and, thus, quadruples the power output, from 1W to 4W.
As I look at this schematic, I realize that not only is layout going from right to left, a no no, but that the second bridge rectifier quartet does not look like the bottom one.
Well, remaking the four-300B amplifier and other single-ended designs led me back to an old design idea, the super triode. The triode's low plate resistance creates an intrinsic negative feedback loop with the triode, limiting its maximum voltage gain to its mu, which is just the product of its transconductance against its rp. Nonetheless, what we really need is a beefier triode, a triode capable of delivering several amperes of current under little cathode-to-plate voltage, a triode that is relatively cheap and widely available, and a triode that does not require gobs of heater current.


The answer to our dreams was the wedding of the triode to a solid-state power device, such as a power MOSFET or bipolar transistor; and like most marriages, where one partner has more control than the other, usually the weaker one ruling over the stronger one, in this marriage, the triode is running the show. In fact, the triode draws a fairly constant current, while the MOSFET swings big current flows, as the constant-current source in series with its cathode, limits the triode's conduction. Here the triode only serves to provide the needed bias voltage and drive current for the power MOSFET. Wait a minute, John; what happens if the triode's cathode voltage isn't high enough to turn on the MOSFET; or too high, so the MOSFET over conducts and melts? The answer is we need an auto-bias circuit to set the MOSFET's idle current flow, such as the one shown below. If we limit the ECC99's current conduction to 10mA, we will have to set a cathode voltage of 13.5Vdc, which would set the MOSFET on fire. For those of you who still have old computers running Windows XP (32-bit) or any other Windows 32-bit OS, I have setup the download availability of my old old standards: Tube CAD, SE Amp CAD, and Audio Gadgets. One day, I do plan on remaking all of these programs into 64-bit versions, but it will be a huge ordeal, as programming requires vast chunks of noise-free time, something very rare with children running about. I bought an Aikido stereo linestage kit from you some days ago, and I received it just this Monday. High-quality, double-sided, extra thick, 2-oz traces, plated-through holes, dual sets of resistor pads and pads for two coupling capacitors. The Tube CAD Journal's first companion program, TCJ Filter Design lets you design a filter or crossover (passive, OpAmp or tube) without having to check out thick textbooks from the library and without having to breakout the scientific calculator. While the program's main concern is active filters, solid-state and tube, it also does passive filters.
Tube crossovers are a major part of this program; both buffered and un-buffered tube based filters along with mono-polar and bipolar power supply topologies are covered. My name is Berca Iulian, i`m from Romania, i have electrical engineering studies i work develop new 3Phase inverters for Brushless motors and PMSM. I`m designing in Eagle-cad : brushless controller circuits, dc motor controller circuits,protection circuits,etc. I`m constantly improving my design for a robust brushless controller, with all protection needed (overcurrent, over-temperature,fault output, torque control) also ramp acceleration and deceleration and adapting timing angle.
This is the newest version with 4 mosfet in parallel per switch  IR4110 but doesn`t matter what mosfet you use as the volgate and current is good for you. In the right upper corner command module and in lower corner a dc-dc converter module from ebay. Description In the market, there are several types of telephone security devices which are generally simple but not cheap. I need a simple circuit to submit to the university and consist of only capasitops,resistors,transistors,ic,relay,and leds please if possible reply within an hour. I better use this on my house since I have so many house maids and I want to monitor their usage of telephones! I chose the Microchip product over the industry standard 7660 device because it is cheap, it works with a supply voltage up to 12V, and you can double the switching frequency of the original to 20kHz. Consequently, if you do run the circuit on batteries then as the input voltage drops below 9V, so the output voltage falls off in step.
If you want to pull significant current from the LM2585 design, you may need to change the inductor, the smoothing capacitors and the compensation network.  Best to go back to the Ti WEBENCH software and see what you get. Feel free to join the discussion by leaving comments, and stay updated by subscribing to the RSS feed. I posted a schematic for a power supply a while back and there were many suggestions for revisions etc. I'm eager to order the remaining parts that I need and start a physical layout, The past few attempts have been stalled because I find I need to learn something and then I start over.
It's not a guitar amp, and you won't be drawing enough current to cause sag, so to me, it's pointless. I'm still open to replacing the 500uf caps for something smaller but I already have them sitting here.
I've been reading a few pages like this: Power Supplies that offer equations, but I added the second filter and don't know what to make of that situation. Now that I know about the option I'll probably try using your suggestion on a future project. It was suggested by an friend who never fully explained how the zeners work as a regulator. It is not complex, and I would probably stick with that design, but rather use fixed resistors instead of making adjustable. If you use full-wave, you can drop your filter capacitance and lower the cost of your project. The down side as opposed to an IC regulator is that a simple zener regulator draws current by virtue of it's design. The legs bend quite a bit, and you can solder on bits of wire to extend them if they don't go far enough.
I can imagine an Aikido LV being fit within an existing CD player, with two DC power jacks placed on the back panel, so 12V and 48V power supplies can be attached to power the Aikido stage. Well, about ten years later, while I was attending a stereo show, I ran into the very same speaker designer and I told him this story. Here is what I would do: give each 300B output tubes its own 5Vdc filament power supply and its own LM317-based constant-current source and its own coupling capacitor to the output. Tubes are high-frequency devices, which makes them susceptible to ultra-high-frequency oscillations. One possibility is to hunt down the makers of distributed sound systems transformers and autoformers, such as Edcor. Time to re-read my last post, which shows many ways to drive a cathode-follower output stage, such as the following. But as this feedback loop exists within the electron stream itself, it is both instantaneous and integral to the triode's functioning.
Yes, it looks something like a Darlington transistor arrangement; and it would be a Darlington circuit of sorts, if we made the following mistake. If we hold a triode's conduction constant, then the plate is mu times less effective than the grid in controlling current flow through the triode.


If the MOSFET draws too much current, the NPN transistor pulls down the cathode voltage and the MOSFET's conduction. This program's goal is to provide a quick and easy display not only of the frequency response, but also of the resistor and capacitor values for a passive and active filters and crossovers. In fact, it can be used to calculate passive crossovers for use with speakers by entering 8 ohms as the terminating resistance. The time rinse obtained with avago IC ACPL-P343 was 1,2uS at 12Khz, not so good  if you want the switching losses low. Here you can find much information about Electric Cooktop Wiring Schematic manufacturers, suppliers and wholesalers.
Rather, these are circuits you might consider running from a substantial rechargeable battery pack or a 9V wall wart or stompbox supply.
I thought the LM317 was supposed to lock down most of the ripple and voltage all by itself. If you didn't have a current-limiting resistor in series, it would pretty much be a dead short. Well, with the new configuration, we can use a 48V wallwart power supply for the B+ and a 12V wallwart power supply for the heaters.
I recommended that the owner of the $$$ speakers take a screw driver and remove the midranges and flip the phase to hear if I was on to something. For example, all four could be used in a cathode-follower output stage with two One Electron UBT-1 single-ended transformers in parallel, with the 16-ohm output taps in parallel becoming 8-ohm taps; the 8-ohm taps, 4-ohm taps. A super-triode amplifier is one wherein we let a triode control a much bigger current delivering device's conduction. Much like a naturally virtuous man, the triode does not need a lot of external straightening. For example, the MOSFET's output impedance will approach infinity and its gain will equal its transconductance against the load impedance. For example, if we increase the grid-to-cathode voltage by 1V, then the plate voltage must fall by mu times to maintain the same current flow.
If the MOSFET draws too little current, the NPN transistor releases its downward pull on the cathode and the MOSFET's conduction increases. In this case, the MOSFET receives its needed gate voltage and the triode gets its needed cathode voltage. Be sure to check out all the PCBs and kits that are now back in stock at my GlassWare-Yahoo store. I know you do this because you love audio, but I think your price of $39 is a bit of a giveaway!
I plan to order a few of those devices and experiment with breadboard until I have it figured out. IC regulators are much more efficient and precise, as well as inexpensive, which is why you don't see zener regulators being used much anymore. Maybe like the hem length on women's dresses predicting the stock market's future performance, there is some matching pattern hidden here.
What answer can I give other than: if you have gobs of cash to burn and the urge to build a 1W stereo amplifier that uses eight super expensive 300B output tubes, four per channel, go for it and God bless your efforts. The completely dismayed speaker owner told me he could never do that; so, I told him to get a screw driver and I would it for him. In contrast, the following amplifier uses a super-triode, as the triode superimposes its characteristics on the MOSFET. Well, in the above circuit, the triode is held to a fixed idle current, so the MOSFET's current conduction must observe the triode's amplification factor (its mu or µ) to maintain the fixed triode current flow. Because the transistor approximates a constant-current source, the 82-ohm cathode resistor sees a fixed voltage drop, much as if the resistor had been replaced by a battery. Also, D1 can be any Schottky diode with a Vrrm of 100V (minimum) and a current rating of 1 A (minimum). Personally, from a service standpoint, I don't like the reliability factor of a series zener string. Perhaps when the economy seems to be improving, audiophiles gravitate towards extravagant single-ended amplifiers; but when the economy seems to be heading south, they become interested in more efficient class-AB, push-pull designs.
Finding a screw driver was not the problem; the problem was that the designer of the speaker would not approve of anyone flipping the phase his midranges. It only holds one winding, with at least one tap (often many taps), which is certainly less.
After paying thousands of dollars for your NOS WE 300B tubes, you will be pleasantly surprised how reasonable the Edcor prices are. Triodes suffer from high Miller-effect capacitance and limited voltage gain and power output; and there are electronic uses that require wider bandwidth and greater power delivery, to say nothing of smaller size and higher efficiency.
In other words, the super-triode, which consists of both the triode and MOSFET, will exhibit a voltage gain equal to the mu of the triode. Well, lately its been a single-ended wave of interest, with a few notable exceptions, of course.
My reply was that since he had bought he speakers over five years ago and since they were now long out of warranty, who cares whether or not the designer might approve, even if he were in the room with us; indeed, if he were in the room with us, he might have recommended flipping the phase himself.
Mind you, they do not sell 50-ohm resistors; in fact, they are actually two 100-ohms resistors configured like this. Like a transformer, however, it reduces voltage swing and increases current swing; and it magnifies impedance, while delivering same amount of power out that it receives. Or you are a Electric Cooktop Wiring Schematic manufacturer, click here to publish your product information now.
In other words using an autoformer at a triodes plate, assuming the plate is at some high B+ voltage, can be lethally dangerous; but used at its cathode, assuming the cathode is at ground potential, can be perfectly safe. So the T2 gets forward biassed.  As a result the base of T1 is grounded and the remaining part of the circuit doesn't get any supply.
In this condition, circuit draws so small current that is negligible and does not effect the normal operation of the telephone line.



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