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Click 'Files' to download the professional version 2. Setup File Name : autcdf. Full Setup Size : 2 GB. Latest Release Added On : January 27th, The older version features included here. All tools with description. The bass is rock solid and it slams. I swear I can feel the bass notes in my chest. The music comes out alive and forceful. On the other hand, my octal equivalent sounds more mellow, in a radiant, glowing way, which is altogether beguiling. It isn't sloppy by any means; it's just more yang than yin.
I sold many PCBs and kits and I have gotten great comments from users. I still listen to headphones with it and it sounds amazingly good as a line-stage amplifier. Moreover, when a supply of a trendy tube grows small, two things happen: obviously, the price goes up and, all too often, the quality goes down.
Diminished quality? One thing that I love about OpAmp circuits is being able to hook up two 9-volt batteries and run, with just a single bypass capacitor across the positive and negative power supply pins—no lethal voltages and no heater power supply to worry about.
Low-voltage power supplies are a breeze The low-voltage regulator is meant to power the tube heaters; the high-voltage power supply, the rest of the tube circuit But I decided that since octal tubes seem more retro than 9-pin tubes and the Janus regulator is a pure-tube design that even uses a tube rectifier, why not wed a Janus regulator to the Aikido stage instead? Tube Clock Tube clock? Is it a piece of artwork, worthy of window display in exclusive art galleries?
Or is it the long-awaited analog replacement to the famed Tice digital clock? Or is it a chronometer of exceptional precision? Or is a timepiece of uncanny beauty, suitable for adorning walls of Beverly Hills mansions and Manhattan penthouses?
Or is it something like a badge of affiliation to an almost cult-like adoration of vacuum tubes? It is also my latest kit offering Now for something completely different I have created small, 4 by 6 inch PCB that holds a low-voltage bipolar regulated power supply for solid-state use. I have been experimenting with OpAmp circuits lately and I needed a killer low-voltage, bipolar power supply I made the PCB half an inch taller, which allowed a fatter heatsink to be used.
In general, a fat, short heatsink is better than a tall, skinny heatsink. The intrinsic thermal resistance of the metal is effectively placed in parallel in a fat heatsink; in series, a tall heatsink. This chubby heatsink boasts a thermal resistance of only 3.
The selector switch assembly accepts three stereo inputs, with both the hot and grounds of each signal source to be selected. So if a signal source, say a CD player, is not selected, neither its outputs or grounds make any connection to the line-stage amplifier Each voltage regulator also finds its own raw power supply, holding the all the rectifiers and power-supply reservoir capacitors required for feeding each regulator its raw DC voltage. In other words, except for the power transformer s , the PS-1 PCB holds all that is needed to make a superb regulated power supply for tube-circuits At long last: the Aikido Phono Preamp This Aikido phono preamp uses passive equalization, rather than active, feedback-based equalization.
The passive equalization network sits in between two Aikido gain stages Now the attenuator will fit within a 1U rack-mount enclosure. Second, the TCJ stepped attenuator now offers many more positions, a total of 66 steps with 1dB resolution, as the center switch now presents 11 positions, rather than the old 6 positions. Third, and most importantly, the old open-frame rotary switches have been replaced by Elma switches. Swiss-made, gold-heavy, precisely-designed and exquisitely-made, Elma rotary switches are justly famous as the gold-standard in switches.
And like all things golden, they are obscenely expensive. But when only the best will do…. Janus Shunt Regulator The feedforward shunt regulator only looks forward, creating a counter noise signal to null the original power-supply-induced noise.
Unfortunately, it is blind to what develops on the other side of the series resistor. In contrast, the feedback-based shunt regulator sees only the disturbance on the output side of the series resistor. Now, what would happen if we wed the two approaches together? The attenuator is a hybrid design that uses both series and ladder attenuators and three rotary switches to yield 36 positions of attenuation in -2dB decrements.
In the first six positions, the attenuator is just a ladder attenuator, with no more than two resistors in the signal path; thereafter, the attenuator uses both a ladder and series attenuator configurations, with never more than eight resistors in the signal path. With -2dB decrements, a maximum of dB of attenuation is accomplished.
First the good news: the rumored Aikido printed circuit boards do exist, and they are beautiful. They look fabulous and feel solid in the hand. They are extra thick, 0. Sneaking Aikido Mojo Into a Regulator Sometimes a small modification to an existing circuit can produce a large improvement.
Let's take a look at a simple series high-voltage regulator that uses a single tube, a 12DW7 dissimilar-triode tube. Hybrid Janus Regulator My original Janus regulator was an all-tube affair. Like the Roman god, Janus, the regulator looks at both the raw DC power-supply voltage and the regulated output voltage. Actually, the regulator didn't regulate the output DC voltage, only the AC component of the output voltage. Back when I was a young lad in the previous century, my favorite English teacher only allowed one exclamation point per essay.
Well while typing this section heading, I was sorely tempted to use two. First, some background history: for the longest time I have wanted to build a current-output headphone amplifier.
In fact, seven years ago I started building one, which I displayed in post Well, I was going through the articles and I saw one by Fabio Barberini, which details how he implemented regulated fixed-bias for his tube-based push-pull power amplifier. Each output tube gets its own negative three-pin voltage regulator an LM and adjustment potentiometer Music Recommendation: Composition Transcriptions A transcription is a new arrangement of an existing musical composition for some other instrument or voice than that for which it was originally written.
We can transcribe from small to large or large to small. Back when most middle-class homes held a piano, transcriptions of orchestral works to piano were common; but we can go from piano to orchestral, which brings us to Mussorgsky Happy Halloween Is your perception the same as mine? When I was a child, Halloween lasted about two to four hours at the very end of October. Today, it's a many-day event My thanks to Davide Bucciarelli, who wrote an interesting article that details his construction of a based class-A, push-pull power amplifier, which happens to use my Aikido split-load phase splitter I didn't bother to make a SPICE circuit based on this circuit to evaluate it, as I had plenty of hands-on experience with similar circuits.
But as I looked over the circuit recently, I wondered if the KT88 was the best choice and just how low an output impedance the regulator might achieve Patent US 8,, Bipolar Speaker with Improved Clarity While searching for something else, I found on my hard-drive an interesting patent, which I have no memory of seeing before. How did it get there? No doubt, I ran across it during a Google-Patent search and I downloaded it for future perusal, which means that I forgot about it. The patent, by Definitive Technology, covers a bipole loudspeaker, with a slight—but patentable—twist His album, Kaleidoscope, impressed me even more More Shunt Regulators The shunt regulator stands out due to its relative rarity.
If it were the primary regulator topology, I would be writing about the series regulator instead. The contrast between the two is interesting. The series regulator operates in current phase with the load. If the audio circuit draws more current, the regulator sees the same current increase. In contrast, the shunt regulator conducts in anti-current phase Bastode Series Regulators As far as I can tell, I haven't covered bastode-based voltage regulators here before.
Time to make amends. The name "Bastode" is Rene Jaeger's inspiration, the circuit being like a cascode, but not really. The bastode is simply a differential amplifier that is arranged vertically, rather than horizontally or laterally More Series Regulators A big fat book could be written on the topic of voltage regulators; the subject is near infinite. For example, I start with one circuit, then I see a variation, which then gives rise to another variation…on and on it goes I wouldn't have to make the long drive to Denver, deal with hotel arrangements, fight to find a parking spot near the event, acquire my press pass, lug my tote-bag from room to room, wait for elevators, endure sales rep's endless prattle, squeeze into tiny rooms filled with huge loudspeakers, subject my ears and soul to relentless and oppressive bass thumps, take brochures that I knew I would never read, mourn the want of vitality from the attendees and sanity from the exhibitors, miss connections with friends… Damn.
My delight now transforms into depression First of all, their music sounds to my ears far more American than European. RMAF is closing its doors. Vacuum Tubes Coming to Your Street? There are many types of vacuum tubes. Most audiophiles have heard of rectifiers diodes , triodes and pentodes. In contrast, few have heard of carcinotron, klystron, and gyrotron tubes Two-Triode Aikido Amplifiers Building upon the last post, which showed a two-triode line stage that was imbued with Aikido Mojo, let's look at some other two-triode designs.
In Post eleven years ago, the Broskie split-load phase splitter appeared. This variation on the simple split-load phase splitter aka, cathodyne was to use two triodes to improve vastly the circuit's PSRR One of the best was made by Philips for O'Neill, the surfer gear company. The blue earbuds didn't sound better, but they were robust enough to last the longest Combining Series and Shunt Regulators Series regulators dominate, as they are far more efficient—in general—than shunt regulators.
The analogy I like to make is that series and shunt regulators are, respectively, similar to class-B and class-A amplifiers Randall Jarrell I am a huge fan of the American poet, literary critic, essayist, and novelist, Randall Jarrell, although I have only read his literary criticisms and essays.
He died in ; he was only As I read the first few paragraphs, I was struck by how one could easily substitute the words "poetry" with "high-end audio gear," "reading public" with "audiophiles," "publishers" with "audio manufacturers," and the same conclusions remained intact. Here is my altered version for your evaluation Originally, there was the Penguin Cafe Orchestra, which ended in Penguin Cafe resurrected the band in in From their website we learn The Noval MFB PCB is configured for 2nd-order filters, but we can create a 3rd-order Butterworth low-pass and high-pass filters by adding two external sets of capacitors and resistors.
This dawned on my while creating the user guide for the PCB In the twenty steps I took to return to its brothers, I flipped through its pages.
Two circuits instantly caught my eye. The first was a huge schematic typo; in other words, a mis-drawn schematic. Here is the original Kreskovsky Transient Perfect 2nd-Order Crossover Everyone knows that 2nd-order crossovers introduce a shifting phase that starts at zero, reaches 90 degrees at the crossover frequency, and ends in a degree shift; moreover, that the two drivers must be wired in anti-phase to avoid a deep suck-out at the crossover frequency.
So, how is a phase-flat 2nd-order crossover possible? The punch line is that John Kreskovsky's crossover is not really a speaker crossover but a speaker over-lapper.
Nonetheless, it delivers a phase-flat output. In other words, square waves go in and square waves come out Broskie Phase-Flat 2nd-Order Crossover Working on the assumption that a picture is worth a thousand words, while a schematic is only worth five hundred, here is a picture of what is possible It was fun revisiting these female singers as they have matured.
For example, Suzanne Vega now sounds as if she has been smoking for years. In addition, we cannot be constantly foraging for something new, as there are times when retrenchment and consolidation are advised.
If for no other reason than it make future forages more fun They were for me and friends, but not for sale. I feared headaches, endless email exchanges. The math was too complicated and sourcing the needed tight-tolerance capacitors too difficult for too many potential customers. Mental self-preservation, in short, explains all.
Well, since posting on the MFB filter in post , I have had a change of mind. I fired up MS Excel and created the following tables that list the filter values for a Linkwitz-Riley 2nd-order filter crossover Solid-state Power Buffer About half a decade ago, I had a fun correspondence with an electric engineer, after he had read post , which detailed an IC I would love to see being made, the TS The idea behind my fanciful IC was that a complete totem-pole OTL frontend input stage, driver stage, and auto-bias circuitry could be housed inside an eight-pin IC package.
My correspondent disagreed, as he thought the heat dissipation would prove excessive for such a small device; he recommended the 7-pin TO package instead Bipolar Power Supply from 12Vac The triangle buffer shown above needs a bipolar power supply. We could go the fancy route, with fully regulated positive and negative power-supply rails.
On the other hand, we could use a 12Vac wallwart. My reasoning is that since the triangle buffer shown runs a heavy idle current to maintain class-A amplifier push-pull operation, we could get away with something simpler Hybrid Phono Preamps Our goal is simple: use each technology where its strengths shine through.
With hybrid power amplifiers, the usual setup uses tube up front for signal gain, with the solid-state output devices following, delivering current gain. With a hybrid phono preamp, we reverse the order. Solid-state offers low-noise amplification; tube-based circuits, lush sound and huge voltage swings.
With a hybrid phono preamp, we don't want the tubes leading in front and the OpAmp following behind, as the tube's high noise will only get amplified Bi-Amped Phono Preamps In the previous hybrid designs, the OpAmp receives the signal from the phono cartridge and pass along the amplified signal to the tube-based circuit.
This is the obvious way to proceed. What if, on the other hand, we feed cartridge's signal to triode and the OpAmp at once, in parallel, so both can deliver amplified output signals? Okay, that is crazy enough an idea, but I can make it even crazier. What if we let the triode handle frequencies above Hz and the OpAmp handle frequencies below Hz, then we sum the two output signals into one?
Of the four, I would say that Natalie Merchant is the best singer, but that has not precluded my listening to the other three. Last week I realized that many years have passed since I last checked in on them.
Streaming-music sources, such as Amazon Music and Tidal, however, make this an easy task. Better Facemask Since it appears that, much like the poor, facemasks will always be with us, why not design a better mask? I love asking such questions in front of some of my friends, as the gasps of near-lethal incredulity are delightful to behold. Am I a doctor? How dare I dare to presume to dare disturb the universe…?
I dare. If nothing else, why has no enterprising company sold facemasks with the bottom-half of our faces printed on the front? You send in a photo of your face and the masks arrive displaying your smile High-End Loudness Control Let us think back to happier times.
When your father or grandfather wanted to play his new stereo-demo LP at a moderate sound level, he switched on the loudness switch on his receiver, filling the room with balanced sound, albeit at a lower volume level. Today, we turn down the volume and resulting sound falls short, sounding thin and eviscerated. Why so? We do not have a loudness control. Somewhere around , audio puritans denounced the loudness control as being audio-impure, along with all other tone controls, which only mid-fi listeners would desire and use.
A big mistake this was, as a high-quality loudness control would make for much more enjoyable listening. Too-Loud Loudness Compensation Not just Wallace Simpson aka Duchess of Windsor , but many hold to the belief that one can never be too thin or too rich.
Well, for many audiophiles, music playback can never be too loud. Indeed, for non-audiophiles, an audiophile is someone who is hard of hearing that happens to be also rich Music Recommendation: Estonian Incantations 1 I have listened to many albums with the Estonian Philharmonic Chamber Choir, but I have never sought out their albums in particular.
Recently, I did seek their albums out at Amazon Music. Plenty albums showed up for my sampling. I choose the album, Estonian Incantations 1. This is not your father's classical album, unless he listened to Leonard Bernstein's MASS —many did, in the early 70s, although it generally received bad reviews.
What am I getting at? Speaker Diffraction Loss While writing my last post, and while looking at the first of the two passive RIAA equalization networks, the shelving network that boost the lows below 50Hz by 20dB and then fell off at 50Hz before flattening at Hz, I noticed an exact ratio between the two resistors in the shelving network This was not the case five years ago, when it seemed that all everyone was interested in was building a better DAC, usually with post tube sweetening Music Recommendation: Crime Of The Century While waiting in a local sandwich shop, I listen to music hits from the s pour from the ceiling speakers.
My pleasure restrained by my fear that the under-twenty workers must feel oppressed by this music, preferring as they must something more modern, something trendier. As I collect my roast-beef sandwich, I mention the music to the young man. He loves it; the radio station is his choice.
Amazingly enough, he revels in s music. Mind-boggling—well at least my mind boggled At the time, I owned bi-amped, home-built loudspeakers that held a Hz crossover frequency. The speaker was a two-way design with an Audex 6-inch polypropylene woofer with a cast frame in an insanely over-built sealed enclosure, whose walls were 2.
The motive is to exclude the resistor cathode from the AC signal path, which now includes only the output transformer, the output tube, and the bypass capacitor that completes the circle Music Recommendation: The Naxos classical-music label should be far better known and appreciated than it is.
Many, if not most, of their efforts are beautifully recorded and their CDs cost less than other more famous labels. Over the years, I have bought many of their box sets and have loved the music and the price. I can not customize even a simple wxNotebook What's more, it is out of date. Can you fix the problem caused by high DPI? Will wxwidgets 3. Excellent Tool - Thanks. Report inappropriate content. Thanks for helping keep SourceForge clean.
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