Octave Download Chip

[Ellis Ruan]

<div>Your assumption about jitter in the original chip is probably not valid, since this was a custom chip that used separate dividers for each note. As such, the jitter would be much less than the clock period. You may be confusing jitter with duty cycle. Duty cycle is the ratio of the signal high time to its overall period, which for a fixed divisor would be exactly the same for every cycle of the signal, while jitter is a cycle-to-cycle difference in the timing, which is effectively a phase modulation of the (ideal) signal.</div><div></div><div></div><div></div><div></div><div></div><div>octave download chip</div><div></div><div>Download Zip: https://t.co/VYXDGllIrH </div><div></div><div></div><div>a Illustration of the coherent 2.8-octave tunable terahertz parametric radiation. Inset i: Tunable optical parametric oscillation generation process with microresonator. LD laser diode, EDFA erbium-doped fiber amplifier, PBS polarization beam splitter, TE transverse electric, c.w. continuous wave. Scanning electron micrograph with scale bar of 400 μm. Inset ii: Applications of the broadly-tunable coherent terahertz parametric radiation. b Modeled hybridized mode spectra evolution from the TE-TM coupled modes with swept cavity temperatures, TM: transverse magnetic. Inset i, ii, iii: Measured hybridized mode spectra at different mode temperatures measured with swept-wavelength interferometry and fitted by the double-Lorentzian model. c Generated broadly-tunable parametric oscillation via continuously swept pump-resonance detuning. d Parametric gain oscillation with and without coupled-mode frequency shift, matched with the experimentally measured parametric oscillation peak power. e Representative microresonator tunable parametric oscillation under controlled pump-resonance detuning.</div><div></div><div></div><div>It seems like octave up circuits are everywhere and can be very simple, but I can't seem to find octave down circuits that aren't insanely complex or digital. It doesn't need to be the OC-5, just a simple -1 or -1 + -2 octave circuit (like the Redbeard Honey Badger). Is there a reason it's so different than an octave up one? Thanks for the help!</div><div></div><div></div><div>We present a design for a superconducting, on-chip circulator composed of dynamically modulated transfer switches and delays. Design goals are set for the multiplexed readout of superconducting qubits. Simulations of the device show that it allows for low-loss circulation (insertion loss 20 dB) over an instantaneous bandwidth of 2.3 GHz. This design improves on the bandwidth of previous superconducting circulators by more than an order of magnitude, making it ideal for integration with broadband quantum-limited amplifiers.</div><div></div><div></div><div></div><div></div><div></div><div></div><div>Now ignore the bodge wire job, these are common in old equipment. I was more interested in the chip hanging on to the PCB for dear life. It was a 74LS93 4 bit binary counter. I was starting to think this could be the issue with the notes not changing and the keys not working as an organ such as the Hammond works by generating a tone and dividing it up to make each individual note, as far as I understand (I do stand to be corrected). This was leading me to think that the binary counter could be used in part of this division so I started to look for where it may have come from. Sadly this idea fell flat when not a single chip socket was found to be unpopulated, but this does tell me that somebody may have been here to fix this exact same issue before me and more than likely, caused further damage.</div><div></div><div>The only 74LS93 I could find was on the MDD generator board. This board is also where the -27 volts from the power supply go.</div><div></div><div></div><div>Figure: Octave spanning frequency comb generation in a microresonator. Panel (a) shows the experiment with a glass nano-fiber and a silicon chip with optical resonators. A scanning electron microscope picture of a resonator is shown in panel (b). Panel (c) shows the optical spectrum of the frequency comb generated in such a microresonator seeded by a single frequency laser.</div><div></div><div></div><div>As I say, this is just a bit of playing around. If you want to know how to do it properly, there is a project that describes how to use an AVR chip with some clever coding to provide a complete, pretty accurate, replacement for the specialist chips used in organs and string synthesizers from the early days of electronic music. You can read about it in full on the following:</div><div></div><div></div><div>Edit to add: In this case the reference voltage at the right is 4V, so the voltage at the positions between the resistors is 1V, 2V, and 3V. So each step on the rotary switch gives you a 1V difference, meaning a 1 octave change.</div><div></div><div></div><div>The Stereo Chord EGG was a novel little circuit introduced in kit form byPAiA in 1976 as aninteresting application of a top octave generator IC. This chip, which wasstate-of-the-art at the time, generated a whole octave plus one note (C8 to C9)on its 13 outputs from a single high frequency input (2MHz). Its mainapplication was in electronic organs, where the outputs were fed into frequencydividers to produce a full range of pitches (e.g. C1 to C9) at variousfootages. This was a big improvement over earlier electronic organs that had aseparate oscillator for each top octave pitch, which could drift out of tunerelative to each other.</div><div></div><div></div><div>In the Chord EGG, the top octave generator was used in a slightly different way. The Chord EGG fedit a much lower frequency input (125kHz) to directly generate the octave fromC4 (middle C) to C5. These notes were combined into chords (F, G, and twoinversions of C). The circuit played a random sequence of these chords, eachfor a random length of time. Another part of the circuit randomly varied theamplitude of each note in the chord as it played. Finally the chord was fedinto two voltage controlled filters (VCFs), each under the control of its ownrandomly varying control voltages. The filter outputs were the left and rightchannels of the stereo output of the Chord EGG.</div><div></div><div></div><div>The only flaw with this plan is that Chord EGGs are hard to find, as alreadymentioned. Being the DIY sort, building one from scratch is the obvious answer.Unfortunately, top octave generator chips are equally hard to find, and veryexpensive when they do pop up.</div><div></div><div></div><div>The tone generator consists of an oscillator at approximately 125kHz (not250kHz as described in the manual), feeding an MK50240 top octave generatorIC. Eight of the 13 outputs of this IC provide the notes C4, D, E, F, G, A,B, and C5. Due to the inaccuracy of the simple oscillator, the octave couldstart on any note (or even between two notes), but the frequencyrelationship between them will still be that of a major scale.</div><div></div><div></div><div>As mentioned previously, the MK50240 top octave generator is no longer made,and is quite hard to find for a reasonable price. Likewise, the LM3900 Norton(current differencing) op-amps used for the low frequency oscillators are alsoout of production, so a design change was required there as well.</div><div></div><div></div><div>At first glance, one approach to replace the top octave generator would be touse a PIC or similar micro-controller, but generating eight notessimultaneously is a task for which a PIC is probably not fast enough. Analternative approach would be to implement the tone generator, chordrandomizer, and chord selector together in a PIC, in which case it would onlyneed to generate the three currently playing notes simultaneously, which mightbe achievable.</div><div></div><div></div><div>However, I really wanted to build this entire remake using parts available inthe 1970s, so I adopted the same approach that electronic organs used beforetop octave generators became available: separate oscillators, one for each topoctave note.</div><div></div><div></div><div>Redesigning the two low frequency oscillators of the chord randomizer to usestandard op-amps was easy, but that left the issue of how to decode theresulting 2-bit number to one of 4 outputs. I could have used a pair ofquad CMOS NOR gates like in the original design, but that would have requiredone and a half chips, leaving two unused gates (in the original design, theseimplemented the 125kHz clock for the top octave generator).</div><div></div><div></div><div>An interesting outcome of the redesign is that it uses the same number of ICsas the original (five), but instead of one specialized LSI chip, two CMOS quadNOR gates, and two quad Norton op-amps, the redesign uses five identicalreadily available TL074 (or LM324) chips! This came at the cost of 52 extraresistors, 8 more capacitors, and half a dozen diodes.</div><div></div><div></div><div>My HAL is a full scale resin kit. It came with a clear plastic dome, HAL9000 decal, a LED light kit for the red dot you see in the lens in the movie, a speaker, and a sound sample chip with a bunch of HAL sound clips you can trigger. I decided I wanted a real fisheye lens instead of a badly simulated lens. Then I decided I could attach a small CCD security type cam to the lens. I have an old portable DVD player with a yellow RCA composite video input to let me see through the fisheye. I might add an intercom circuit.</div><div></div><div></div><div>I have a couple of M083 top octave dividers, and would like to build a Chord EGG someday. I have all the documentation, including the PCB designs. Id be interested in chatting with anyone who would also like to get a PCB done up.</div><div></div><div></div><div>Optical-frequency combs are versatile laser sources for precision, ultrabroadband measurements, including with time, frequency, chemicals, digital information, positioning and navigation, and generation of quantum states. Within the NIST-on-a-Chip Program, this project explores the generation of frequency combs via nonlinear optics with integrated photonics microresonators, which offer milliWatt threshold power for frequency conversion. Such microresonator frequency combs, or simply microcombs, are at the forefront of discovery research with completely novel states of light and new frontiers in semiconductor technology. We combine innovation in nonlinear optical science, advances in nanofabrication of integrated photonics, and ultraprecision time and frequency metrology to develop chip-scale frequency comb systems.</div><div></div><div></div><div>For NIST-on-a-Chip program, we are developing low-power consumption microcombs to support various time and frequency metrology applications. The microcombs are generated by Kerr nonlinear optics when a continuous wave (CW) laser is coupled to an integrated microresonator; a depiction of the basic setup and a scanning-electron microscope image of a microresonator are shown in the Figures. We reported the first demonstration of optical frequency synthesis with a microcomb. Our interlocked configuration of one silica and one silicon-nitride resonator leverages both nanofabrication and photonic-chip integration; optical spectrum measurements of these microcombs are show in the Figures. Our interlocked Kerr comb permits low-noise phase stabilization of its repetition and offset frequencies with respect to the SI second, and coherently reproduce their clock with a fractional precision of</div><div></div><div> 9738318194</div>