View allAll Photos Tagged oscillators
Sold by Lafayette Radio on Liberty Avenue in "downtown" Jamaica, Queens County, New York. Built from a kit before I was 12. While most of the students were involved with sports, fighting, or stealing hubcaps me and a few of my friends were preteen turbo nerds. We would ride our bicycles the 10 miles into Jamaica and buy electronics parts. Or go to Mineola and buy surplus military equipment and take it home (still in the original wood crate) balanced on the bicycle seat. Or go into lower Manhattan (Cortlandt Street or Canal Street), load up on surplus electronics, and drag it home at rush hour in the subway and then a bus. Hated having to take a bus into downtown Hempstead every week for allergy shots until i found a surplus store near the bus terminal.
While basically an AM (amplitude modulation) receiver, it could also be coaxed to decode SSB (single side band) using the built-in BFO (beat frequency oscillator) and FM (frequency modulation) by using "slope detection".
Never got murdered - only attacked once on the way to Jamaica for going into a "candy store" that had only a few packs of gum on a card table near the entrance with a partition with lots of phones ringing in the back. Located near Belmont Park Race Track - the locals knew better than to go in. This was before legalized OTB (off track betting) - gambling on horse races was big business.
The diagram shows a device that was suggested to me, by Douglas Little. Prior to using this device, the performance of my laser was very inconsistent. Here is how Doug diagnosed the problem:
Each cycle of the pump produces a massive sucking force for a brief period: a big pressure shock over and over, several times per second. Coupled with the AC at 60hz, you have two oscillators running over each other. So the result will be interfering waves. You have electrical AC running at one frequency, and you've got the pump affecting pressure in waves, at a different frequency. When you combine waves of different frequencies, you get a mess. This would appear as changes in efficiency of the laser, and as a random flickering within the electrical discharge. An oscillating discharge is cycling through a range of states, including the 'best' one: a bit like a broken clock being right once every 12 hours. However, a stable laser will be stuck in one state, but it is less likely to be the correct state. As a result of this, the entire apparatus becomes very sensitive to any adjustments that are made.
An initial test must be conducted in order to obtain a stable discharge, followed by a second test to optimize the random flickering that will take place. A big jar (capacitor) will help a lot, and a small hole at the laser side of this jar (resistor) will help even more. If laser power seems lower with a stable discharge, then this is an indication that more tuning is needed.
Oscillator 2 of voice 1 of my Prophet 600 is a tad wonky. For the first 30 minutes that oscillator keeps quickly drifting out of tune. The CEM3340 chip (lower left) is the problem, however they all go out until the instrument is warmed up, just not as bad as this one. Luckily they have just started making the CEM3340 again so I will soon get a replacement.
Inspired by a Dave Jones video "EEVblog 1178 - Build a $10 DIY EMC Probe"
Made 2 EMC probes with approximately 1cm and 1.5cm inner diameter, with RG402 semi rigid cable terminated with an SMA male connector. The probes are not yet finished thought, since I have to dip the probe tips in liquid electrical tape, that I don't have for now. I manage to insulate almost all the probe with heat shrink tube but the soldered part of ring is still exposed.
My IDS-2074E oscilloscope, besides the upgraded BW to 300MHz had a recent feature added, Spectrum Analyzer up to 500MHz, and in this photo it's showing the signal radiated from a 100MHz crystal oscillator, captured with the 1.5cm diameter EMC probe. The graph is set with the 100MHz centre frequency and a span of 10MHz.
The Spectrum Analyzer option is accessed through the square button "OPTION", on the inferior right corner of the dark area around the LCD. Until now, that button had no purpose.
The Wolfcraft clamp is just there to hold the EMC probe over the crystal oscillator being measured.
**Cape Henry Lighthouse** - National Register of Historic Places Ref # 66000910, date listed 1966-10-15
**Cape Henry (Second Tower) Light Station** - National Register of Historic Places Ref # 02001439, date listed 2002-12-02
Atlantic Ave. at U.S. 60
Virginia Beach, VA Virginia Beach (Independent City)
The Atlantic Coast and Chesapeake Bay served as a major transportation corridor for commercial traffic from the early 18th through 20th centuries. Cape Henry Lighthouse marks the south side of the entrance to Chesapeake Bay and is considered one of the most important lighthouses on the Atlantic coast. The Lighthouse is the earliest cast-iron-cylinder light tower in the state of Virginia; at 163 feet, it is the tallest cast-iron-plate light tower in the United States. The world's first synchronized radio beacon and electric oscillator air fog signal was put into commission at Cape Henry Lighthouse in May of 1929.
The construction of the first Cape Henry tower (1792), a National Historic Landmark, was the first public works project completed by the new federal government. In 1872, cracks extending from the base to nearly the top of the tower on the north and south walls were first reported by inspectors, though only eight years earlier the tower was reported "in excellent order." The Lighthouse Board, fearing the structure would collapse, recommended a new and more substantial lighthouse be built of the first order since it was considered "one of the first lights of importance along the coast." It was also noted that the 30-year-old frame keeper's dwelling was in a "dilapidated condition," too small for the number of keepers stationed there, and too far from the tower to insure "proper attendance." An estimated cost for the new tower and quarters was $85,000 with a request to Congress for $50,000 to commence work. This request was renewed in 1873 and 1874. In 1875, the request was raised to $75,000 and renewed again in 1876. Congress finally appropriated this amount on June 20, 1878. In 1878, the Board requested an additional $25,000 which was renewed in 1879 and, finally, appropriated on June 16, 1880. A second request for still another $25,000 was appropriated on March 3, 1881, to complete the lighthouse station. Of these two additional appropriations, $48,063.52 was spent in 1882. (1)
References (1) NRHP Nomination Form www.dhr.virginia.gov/wp-content/uploads/2018/04/134-0079_...
Bush DAC90a host with Roberts R500 lw/mw/sw chassis.
14/5/14 updated version with Roberts R500 front end (mixer / oscillator AF117 replaced with AF138) feeding a Hacker IF strip from a RP25 and a Hacker audio amp (Rp25 again.)
Now with Hacker FM IF card added to underside of Bush chassis fed from a Varicap tuned Larsholt tuner head.
22k lin pot attached to AM tuning capacitor.
Tunes from 88 to 108 which is one reason why i didnt use the hacker tuner i had (88-102) also the larsholt has dualgate mosfets and varicap tuning and is noticably more sensitive.
Needs your free vote of support at: goo.gl/heBmZ7
With enough votes, it could be made into an actual set by LEGO!
Also, please check out my Minimoog models at: goo.gl/iucWKS
AND
the Prism & Spectrum at: goo.gl/pFTr3v
subatomic Midibox SID V2
synthesizer in old vintage commodore c64 computer case
read about this DIY project here in the work blog: www.subatomicglue.com/sidl0g/
for information about making your own midibox go here: www.ucapps.de/midibox_sid.html
This is a MidiboxSID, a synthesizer that has sound chips from the original commodore 64 personal computer from the 1980's. These sound chips are called the SID 6582
The synth is built into an original Commodore 64 computer case. And features 8 SID chips (4 stereo pairs - one SID per ear x 4 voices). Each SID chip has 3 oscillators and a variety of other features like filters, ADSR, ringmod, sync. The synth has a very flexible (and simple to use) modulation matrix, LFO, bassline sequencers, and stores patches in presets.
UPDATE:
2008-05-28 We got midibox of the day! and also covered on the midibox.org's blog
2008-06-02 matrixsynth covered this story
2008-06-05 hack a day covered this story with their own synopsis of the build process!
1988
Type of camera: Integral-motor autofocus 35mm single lens reflex.
Picture format: 24mm x 36mm standard 35mm film format.
Lens mount: Nikon F mount.
Lenses: Lenses with Nikon F mount with some limitations.
Focus modes: Autofocus and manual with electronic rangefinder.
Autofocus modes: Single servo AF with focus priority and continous servo AF with release priority.
AF detection system: TTL phase detection system - Nikon Advanced AM200 module.
AF detectionrange: EV minus 1 to EV 19 at ISO 100.
AF lock: Possible in single servo AF mode once a stationary subject is in focus as long as the shutter button is depressed; in continuous servo AF, focus can be locked with AF-L button.
Electronic rangefinder: Available in manual focus mode with an AF Nikkor and other AI-type Nikkor lenses with a maximum aperture of f/5.6 or faster.
Exposure metering: Matrix metering, centre-weighted metering (75/25) and spot metering.
Metering range: EV 0 to 21 for matrix and (at 100 ISO centre-weighted; EV 4 to 21 for spot with f/1.4 metering. lens):
Exposure meter: Activated by lightly pressing the shutter release button; stays on for approx 8 sec after finger leaves button.
Exposure modes: Programmed auto-multi, shutter-priority auto, aperture priority auto and manual.
Programmed auto exposure control: Both shutter speed and aperture are set automatically; 1 EV increments of aperture is possible.
Exposure compensation: Use exposure compensation button within +/- 5 EV range in 1/3 EV steps.
Auto expsosure lock: By sliding the AE-L lever while the meter is on.
Shutter: Electromagnetically controlled vertical-travel focal-plane shutter.
Shutter release: By motor trigger.
Shutter speeds: Lithium niobate oscillator-controlled speeds from 1/8000 sec to 30 sec; stepless in programmed auto and aperture-priority auto exposure modes; 1 EV steps in shutter priority auto and manual exposure modes; electromagnetically controlled long exposure at B setting.
Viewfinder: Fixed eyelevel pentaprism high-eyepoint type; 0.75x magnification with 50mm lens at infinity; 92% frame coverage.
Eyepoint: 19mm approx.
Eyepiece shutter: Provided. (DK-8)
Focusing screen: Fixed Nikon advanced B-type screen BriteView screen; interchangeable with E type screen.
Viewfinder information: Focus indications, exposure mode, shutter speed/ISO, aperture/exposure compensation, electronic analogue display, exposure compensation mark and flash-ready are all shown in LCD readout; also shows flash recommended/ready light LEDs.
LCD panel information: Shutter speed, aperture, exposure mode, metering system, film speed, DX mark, electronic analogue display, exposure compensation mark, frame counter/self timer/multiple exposure, exposure compensation value, film advance mode, film loading, film rewind, self timer.
Viewfinder/LCD panel illumination: Viewfinder and LCD panel illuminated by pressing button.
Film speed range: ISO 25 to 5000 for DX-coded film; ISO 6 to 6400 for manual setting.
Film speed setting: At DX position, automatically set to speed of DX-coded film; manual setting available.
Film loading: Film automatically advances to first frame when shutter release button is depressed once.
Film advance: In single-frame shooting mode, film automatically advances one frame when shutter is released; in continuous high or continuous low shooting modes, shots are taken as long as shutter release button is depressed; high speed 3.3 fps; low 2.0 fps.
Film rewind: By pressing buttons with red rewind markings simultaneously; rewind stops auotmatically when film is rewound.
Frame counter: Additive type; counts back while film is rewinding.
Self-timer: Electronically controlled; timer duration selectable from 2 to 30 seconds in one second increments; blinking LED indicates self-timer operation; cancellable.
Depth-of-fiel preview button: Provides visual verification of depth-of-field in aperture-priority auto or manual exposure modes.
Reflex mirror: Automatic, instant-return type.
Camera back: Hinged; interchangeable with Nikon Multi-Control Back MF-21 or World Time Data Back MF-20.
Accessory shoe: Standard ISO-type hotshoe contact; ready light contact, TTL flash contact, monitor contact.
Flash sync control: Normal sync, normal with red-eye, slow sync and rear curtain sync provided.
Flash synchronisation: In programmed auto or aperture-priority auto, shutter operates from 1/250 to 1/60 sec in normal sync or 1/250 to 30 sec in slow sync; in shutter-priority auto or manual exposure mode, shutter fires at speed set, and when set from 1/250 to 1/8000 sec, shutter is automatically set to 1/250 sec.
TTL multi sensor: Five segment multi sensor used for TTL auto flash control.
Automatic balanced fill-flash: Possible when AF Nikkor or AI-P Nikkor lens is used with Nikon dedicated Speedlights.
Flash recommended/ ready light: Lights up in green when flash is recommended and no speedlight is attached; when speedlight is attached, lights up in red when Nikon dedicated speedlight is ready to fire, or blinks to warn of insufficient light for a correct exposure.
Number of 36 exposure film rolls per set of fresh batteries:
Battery 20oC -10oC
Alkaline 105 15
Manganese 25 3
Ni-Cd 75 22
Power source: Four AA alkaline, Ni-Cd or manganese batteries.
Battery check: Battery power confirmation as full battery sign; half battery for nearing exhaustion; blinking half empty battery sign indicates batteries are just about exhausted; no indication appears when batteries are completely exhausted or improperly installed.
Dimensions (W x H x D): 154 x 103 x 67mm approx.
Weight (body only): 695g approx.
12/1/11. Portland, Oregon. Riding to work. Nikon Coolpix S8100, handheld and sooc.
1000 5/3/15.
LEFFER VRM 2500 OSCILLATOR
The Leffer hydraulic casing Oscillator has over 8 million ft-lbs of torque and 580 tons of extraction force. This
machine is capable of drilling over 200 ft deep with a 2.5M oscillator casing.
This machine is used in caving soils where the bore hole requires casing to the bottom of the hole.
New from Bubblesound and now in-stock, the VCOb. Not only does it sound awesome but its also very affordable. This is a great oscillator to start with when building a Eurorack system as they're compact, priced well, plus have lots of features and character. They also have their place in larger systems. The tuning is solid and the module can do both linear and exponential FM.
Yes, the module is 8 HP.
Logitech LS1 Laser Mouse
Sensor Markings:
S7550
80826T
2AV
Looks like this one is an ADNS-7550: www.avagotech.com/pages/en/navigation_interface_devices/n...
The controlling chip+USB interface:
CY7C63813-PXC
C56632AF
PHI0837 A O4
647813
It's a Cypress Semi part:
- has an internal oscillator (yay!)
- 8K Flash/256 Bytes RAM
Assuming it can be wiped & reprogrammed with the Cypress PSoC tools, there's some serious hack potential here! Change some of the buttons into sockets and soft-configure as outputs.
Super portable Arduino-compatible thing.
- 3xAAA battery-powered
- RGB LED on PWM pins
- 38kHz IR remote receiver
- ATmega8 w/ internal oscillator running @8MHz
- old Arduino bootloader w/ fuses set to not need ext. crystal
- 15mA idle current
- fits in pocket
- causes small amounts of glee
Antenna is designed to receive the WWVB time and frequency signal from the National Institute of Standards and Technology (NIST) in Ft Collins, CO.
Simple set up... just aim the antenna toward Colorado using the arrow. Works great indoors in Upstate NY. Not need to mount it outside (it is weatherproof). Will accept long cable runs without a preamp due to the 60 kHz frequency.
WARNING: Spectracom receivers extract the carrier from WWVB using a PLL to discipline a local oscillator. The new phase modulation scheme, to be activated by NIST in July, 2012, does not allow carrier extraction in this manner... and impacts the ability to decode time-of-day reliably.
Translation: Netclock/2 (and other Spectracom WWVB receivers) will fail. It will unlock from "time sync" and begin freewheeling when the change is initiated. The good news: cheap consumer clocks will work better.
The Science Museum of Minnesota has a wave generator. You can adjust the frequency and amplitude of the oscillator that generates the waves. You can also tinker with the "seafloor" profile. I found that a large amplitude, low frequency oscillation, combined with a gradual decrease in "sea" depth led to the biggest and most clearly defined waves.
As of 20 Dec 2013, this is, by far, my most viewed image in Flickr. I have no idea why.
Description: A student is being shown how to locate underground telephone cables by using a search coil and tone oscillator.
Location: Pakistan
Date: 1954-1955
------------------------------------------------------
Our Catalogue Reference: Part of CO 1069/514.
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Please use the comments section below the pictures to share any information you have about the people, places or events shown. We have attempted to provide place information for the images automatically but our software may not have found the correct location.
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The next Eurorack module from Macbeth Studio Systems will be the Oscillator. More than just one half of the Dual Oscillator, this single module retains the full and rich sound of the original but offers a wide range Osc Sweep knob as opposed to the octave switch while still using the luxury multi-turn fine tuning pot. It also has a switch to put it into LFO mode as well as two seperate sub oscillator outputs- in addition to all the standard waveform outputs.
We expect the X-Series Oscillator in early January for a price around $699. The size is 21 HP. For those who already have a Dual Oscillator, it makes a perfect third oscillator/modulator for that classic "Minimoog voice".
"Experiments with differently attuned coils, and responding to the vibrations transmitted to them through the earth from an electrical oscillator. The large coil on the right, discharging strongly, is tuned to the fundamental vibration, which is fifty thousand per second; the two larger vertical coils to twice that number (...) and the remaining small coils to higher tones..."
www.diyaudio.com/community/threads/asynchronous-i2s-fifo-...
1.To compare phase noise, oscillators have to be at the same frequency.
2.45.1584MHz is selected for the comparison because 45/49 MHz clocks can cover the full digital audio ranges from 44.1 to 384KHz
3.SC-Pure phase noise was measured recently by a calibrated E5052 phase noise analyzer from a third party.But all other phase noise numbers are collected from published datasheets or websites.So please correct me if there is anything wrong.
4.No doubt, phase noise numbers have a big impact on the DAC sound quality, but it may not be 100% related.It could be because of the limitation of the fundamental frequency only phase noise measurement method. DAC runs by the square wave clock, not the sine wave. However, each harmonic frequency has its own phase noise and they all contribute to the final phase noise of the square wave clock. That’s why clocks with the similar phase noise numbers could still sound differently.
5. I could be the one who did the most listening tests to different clock oscillators besides Doede. Based on my own experiences of the listening tests, I've found that the close-in phase nose, the phase noise floor and the phase noise in between (Leeson’s equation applied) are all significant to the sound quality. An oscillator can not achieve a higher grade sound quality if it doesn’t have good close-in phase noise even though its noise floor is great. On the other hand, a good close-in phase noise oscillator can also sound a bit fat, less sound stage any dynamic if the noise floor or the phase noise in between are not great.
6.45.1584MHz Neutron Star2 is a pretty expensive clock. But I found it just uses a fundamental non SC-CUT cut crystal (not the 3OT SC-CUT) . It does have a heater on the PCB but just to keep the crystal temperature stable at around 40 degree C regardless of the ambient temperature. Don’t know why NewClassD didn’t publish the phase noise specifications.
7. Normally SC-Cut crystal oscillators have both better overall phase noise performance and better sound quality than AT-Cut crystal oscillators.
8. Limited by the noise floor of a phase noise analyzer, oscillators with great far off phase noise may not correctly show from the measurement results.
The birthplace of Silicon Valley, as stated in the sign, the garage barely visible in the background is the famed location where Stanford electrical engineering students Bill Hewlett and David Packard agreed to form the company Hewlett-Packard in 1935 (the order of the names decided by a coin toss). Influenced by Professor Frederick Terman, they decided to start their own company instead of moving East to join a large business corporation. In 1939, the pair designed the HP200A low-distortion audio oscillator, with an innovative negative feedback loop using a thermal resistor in the form of a cheap light bulb. The oscillator was purchased by Walt Disney for certifying surround sound in the movie Fantasia. The success of HP made students running companies in garages a popular trope, though ironically property values are now so high around Professorville ($1.8 million median) that no student could reasonably be expected to do so in the area.
Downtown Palo Alto, California
the dds-60 kit is now built. untested but fully built.
about 2 hours (maybe more) to solder this. nothing was hard about it and it was almost fun. a surface mount trimmer pot was interesting. having some parts not on the board (later rev) gives extra confusion.
the packing and numbering of parts was very well done. someone put a lot of good thought into it and I can tell.
this project - along with an adaptation of mine will be to add support for this in my volumaster C code base on the LCDuino-1. a multi-tester with buttons, knobs, displays and even programming ports (wired and wireless!)
this was the A+ style kit that I used to build this. VERY impressive packaging on that kit!!
A shot of the control surface of a Roland Juno 60 synthesizer. This particular synth was produced around 1983 and featured analog oscillators which were digitally controlled to aid in tuning stability. The sound of this board is absolutely classic.
Wonderwerp #58
Studio Loos, Den Haag
I was educated as a classical pianist, as which I had to follow a rigid regime regarding the piano literature I had to practice, the harmonic and melodic framework I exercised, and the physical posture I had to train, whereby I had to focus mainly on the position of my hands in relation to the piano keys. The piano repertoire I became most familiar with includes Bach, Beethoven, Mozart, Liszt, Chopin, Debussy, Webern and Schoenberg. Improvisation was not part of my training, at all. But the urge to create something unique and new in music brought me to explore improvisation. While improvisation typically is not part of a classical instrumental training, it can be a powerful tool to free oneself from any musical dogmas. As an improviser I started a process of deconstructing the deeply embedded classical repertoire within myself, and came to add electronics in a very personal way.
Maia Francisco is a pianist, graphic designer and sound artist. She studied art and design at Barcelona’s Escola Massana Centre d’Art I Disseny and piano at the city’s Conservatory of Music. Maia is currently enrolled as a student of Sonology at the Royal Conservatoire of The Hague, where she researches the use of pure sine waves in music. She is investigating improvisational environments that will allow her to interact with the acoustic piano and sine wave oscillators.
This ceramic triode came out of an AM broadcast transmitter I stripped when I was nineteen. The tube was in good shape when I got it. Somewhere along the way the poor thing took a blow. Now the filament is open. Heater requirements were atrocious: 12 Volts @ 300 Amps. Tesla coil duty would have been a poor fit on my power budget. I couldn't provide 3.6 Kilowatts for just the filament. Liquid cooling requirements for that alone would have been outrageous. It's a nice ornament. With RF power gain of 10 this class of triode is only popular for oscillator duty.
I tinkered with 5 KW triodes for regulator pass elements. I found the 3CW-5000 superior in all respects to the 4CW-10,000 tetrode for low peak current regulators, not that triode current is intrinsically limited. On the contrary, grid pulsed I dialed beyond 35 amps peak with modest drive. The owner of the test set stopped me from going higher. Our tetrode loads wouldn't go past current levels set by adustable screen voltage: ~20 amps corresponded to a 1500V screen. High value grid resistors prevented oscillation but slowed tetrode load rise-times. The triode was lightning fast by comparison. Lowering grid resistance on a tetrode to speed rise-time makes it oscillate unless special care is taken. The 4CW-10,000 needs: a $700 socket, a -300 V bias supply, and a +500 V screen supply. The 3CW-5,000 triode has flying leads so no socket is required. No screen grid is present so no screen supply is needed. Average DC cathode current came in at 3 Amps with zero bias (the tetrode only did 2.5 amps at zero bias). With -300V bias applied the 5 KW triode's control grid "cut off" cathode current just like it did for the 10 KW tetrode. Barkhausen oscillation cannot occur for lacking an energized screen grid. (That can be a real nuisance with big tetrodes when they are left in conduction without high voltage applied.) And even the bias supply can be omitted by running cathode-driven/grounded-grid. An NPN transistor of sufficient dissipation rating is inserted into the cathode line. Bear in mind you do have to add a big heatsink to the regulator pass transistor. It's a cheaper tube too, with one less grid and only a 50 amp filament (down from 80 amps). So you lose Barkhausen oscillation, notorious for jamming FM broadcast bands locally. You lose two power supplies and a socket. For an added bonus you'll get an extra half amp of full-throttle cathode current.
My review: I give the 3CW-5,000 a thumbs up.
Tetrodes have superior RF power gain, usually somewhere in the range of 50,000. That makes them oscillate easily. Low RF power gain afforded by the triode makes them ideal for regulator duty. Miller Effect rolls RF gain off below where parasitic oscillations would naturally occur in tetrodes. I never had Dynatron oscillation with a tetrode. I ran 30 KW tetrodes with 1500V screen supplies (where we would normally expect Dynatron Oscillation). I could regulate down to a 12 volt tube-drop @ 2.4 amps DC (anode to cathode). Nonlinearity predicted in datasheets never appeared. My screen voltage is allowed to collapse softly in unison with the anode voltage: my screens are fed by resistors for limiting intercept current, also rolling off RF gain via the Miller Effect. Big bleeder resistors allow my screen supplies to sink modest current.
Truetime NTS-200 Network Time Server with optional rubidium oscillator, shown with weatherproof 12 volt active GPS antenna.
The term 'Network Time Server' applies to a network appliance that acquires time from an external source (usually GPS atomic clocks), maintains time in its internal local clock, and supplies accurate time to a network using NTP (network time protocol).
TrueTime was acquired by Symmetricom.
A Stratum 1 time source.
High Frequency Oscillator designed for use in computers and automotive applications. Used by Millard Associates.
West Lothian was the centre of much ‘high tech’ industry. By 1980, there were 30 electronics companies in Livingston New Town. This led to the town being known as the capital of Scotland's Silicon Glen and, in turn, attracted a number of Japanese companies to set up operations in Livingston.
West Lothian Museums. http://www.westlothian.gov.uk/tourism/museumsgalleries/ums/information
If you would like more information about this object, please contact: museums@westlothian.gov.uk, quoting WLDCM1995.049.001.
Back together again and working (except for the strobe, which unfortunately appears to be dead - don't hear the oscillator whining when I switch it on). I have another small strobe I can slip into its adapter if I like, though flash seems inappropriate for this type of camera, it would kind of blow the 'covert' thing.
This is a more complex and sophisticated camera than I had expected. If it weren't for the 2-speed shutter, this would have been the top of the Minolta-16 lineup. Even that made sense in the context of the design, though: the meter was set up so that you would dial through the apertures at one speed, if it wasn't enough then you would change speeds and keep going. Having just 2 speeds spaced 3 stops apart makes this simpler than having a bunch of intermediate speeds that you would never use.
A few days ago I found out about a plasma effect that turned out to be easy to duplicate (since I had most of the parts needed). Basically the globe is a low pressure xenon globe (with some oxygen contamination ie green). The circuit driving the loop of wire is a ~10MHz oscillator running at about 19V and 3 amps.
The oscillator sets up a field that is not enough to ionize the xenon. I used a HV vacuum leak coil to ionize the globe. The mystery is why it forms a stable toroid.
In this video the loop is at the bottom of the globe. The ionized ring is hot, rises to the top of the globe and at some point loses enough energy (because it's getting farther form the coil) and flames out. A new toroid then forms and rises like a smoke ring and decays.
Why the toroid forms in the first place is not something I can explain. I also like the little noises it makes as the toroid forms.
The BG 24 H rotary drilling rig is ideally suited for:
Drilling cased boreholes (installation of casing by rotary drive or optionally by hydraulic oscillator – both are powered by the drilling rig).
Drilling uncased deep boreholes that are stabilized by drilling fluids.
Drilling boreholes with long hollow stem augers (CFA system), with or without kelly extensions.
Special drilling systems, such as FOW piles, displacement piles, single mixing walls, and cutter soil mixing.
Rotary Drive KDK 250 K Metric Standard
Torque 237 kNm 174,811 ft. lbs.
Maximum Speed Of Rotation 32 U / Min. 32 rpm
Crowd System
Chain Driven Crowd
Crowd Force Push 330 kN 74,187 lbf.
Crowd Force Pull 330 kN 74,187 lbf.
Stroke (Kelly Bar System) 9,150 mm 30 ft
Maximum Stroke Of Sledge 15,620 mm 51.2 ft
Main Winch
Line Pull (1st Layer) Effective 200 kN 44,962 lbf.
Line Pull (1st Layer) Nominal 250 kN 56,202 lbf.
Rope Diameter 28 mm 1.1 in.
Rope Length 75 m 246.1 ft.
Maximum Line Speed 85 m / min. 278.9 ft. / min.
Auxiliary Winch
Line Pull (1st Layer) Effective 80 kN 17,985 lbf.
Line Pull (1st Layer) Nominal 100 kN 22,481 lbf.
Rope Diameter 20 mm 0.79 in.
Rope Length 50 m 164.1 ft.
Maximum Line Speed 55 m / min. 180.5 ft. / min.
Maximum Pile Diameter 1,700 mm 5.6 ft.
Drilling Depth Standard 25.5 m 83.7 ft.
Drilling Depth Maximum 57.8 m 189.6 ft.
Base Carrier: BT 75
Engine: Caterpillar C 11
Rate Output ISO 3046-1 313 kW @ 1,800 rpm 420 hp @ 1,800 rpm
Hydraulic Power Output 235 kW 315 hp
Hydraulic Pressure 320 bar 4,641 psi
Operating Weight 82.5 t 181,913 lbs.
Overall Height 21.9 m 71.9 ft.
Breadboard prototype of a capacitance meter.
The capacitor to be measured is placed in a 555 oscillator circuit and an Arduino measures the frequency and displays the calculated capacitance.
This is a performance module designed to be used in a skiff. The module has four gate generators (The arcade buttons) which can be used to trigger oscillators and modulation. The gate generators can then be combined with the 6 attenuators or the 2 waveshapers for great performance controls.
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