1,295 Royalty-Free Audio Tracks for "Car Sounds"

00:00
06:14
Ambience of a quiet street in hamburg with light rain, cars passing by frequently, sound of light rain and raindrops from trees, traffic noise in the distance is very audible. Recorded with a ~30cm ab pair of neumann km183 microphones on a zoom h4.
Author: Pfannkuchn
00:00
02:21
Recording of the traffic noise taken from the balcony in marsala tita street in tuzla, bosnia. Recorded with rode m3 and audio technica at4040 microphones. Recording device: scarlett 2i4 audio interfacesound recorded in logic pro x. No post processing, except audio level normalizing in sound forge pro.
Author: Davor
00:00
00:23
Recording device: roland r-26 portable digital recorder. Microphone: built-in directional xy stereo microphone. Sample rate: 44100 hz. Rec format: wav 16-bit. Edited in: adobe audition (adjusted gain and removed noise for a good, clean signal). Date and location: april 2019, field-recording, sweden. Other: this is an original recording, by myself, which i make available to all via freesound. Org under a creative common 0 (zero) license, i. E. I am putting it into the public domain. You do not have to ask me for permission or credit, attribute, or reimburse me. I hope the sound effect, or parts of it, can be of some use to someone somewhere. Good luck with your projects!kent. Ps. Please comment and rate. .
Author: Kentspublicdomain
00:00
01:44
Wav-file recorded with the zoom h6 with stereo microphone. Recorded in a garden next to a house and a street in a city. A woman comes out the house and starts to trimm a hedge and flowers with a tool. You hear birds and two cars driving on the street coming from a long way. Bonny orbit sound library.
Author: Bonnyorbit
00:00
00:58
During the covid-19 lockdown, i spent some time walking where the city meets a mountain and discovered an area with loud but subtle electric infrastructure wires. These, along with cars, birds, and rustling leaves, are recorded with binaural microphones and cropped down to one minute.
Author: Damianak
00:00
10:01
This clip was a test for my new roland cs-10em binaural microphones. It was recorded from my balcony. I live in city so you will hear traffic, cars and motorcycle, people chatting and a barking dog. For this clip i used my zoom h1n (96khz/24bit) with roland cs-10em binaural microphones. The sound was no post-processed.
Author: Nicolo
00:00
45:43
This sound is about 9 hours long from the evening 13rd of april 2014 to the morning on 14th of april. First 2-3 hours aeroplanes passed by. Than at about midnight our and our neighbour's dog barked at each other sometimes. Near the and you can hear rooster and finally the birds tweeting as morning came. Recorded in pécel.
Author: Csengeri
00:00
08:02
This is the sound of traffic at a stop light both stopping and going through the light as it turns red and green. There is a motor cycle in this audio that is idle waiting for the light with some revving and it's ultimate take off. Recorded in stereo with a sony pcm-d100.
Author: Tom Kaszuba
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00:13
Single note sampled from an analog synthesizer by modular samples. Modular samples provides samples of vintage and modern synthesizers for apple exs24, native instruments kontakt, reason and live samplers, with over 50 gigabytes of public domain content. Sampler files and sound packs are also available at http://modularsamples. Com. Synthesizer: akai ax80patch name (pack): easy plucknote: c2midi note: 36.
Author: Modularsamples
00:00
00:33
A hyundai ix35 can be heard. It is started, runs a bit with isolated revs, and is turned off again. Before and after startup you can hear the car's control electronics. Feel free to use the sound; no attribution required. Feel free to write me in the comments what you used the sound for. Equipment:beyerdynamic mce 86 n(c)zoom h4n. File:wavmono48 khz24-bit.
Author: Ladako
00:00
00:02
A collision sound of a vehicle crashing or some kind of mechanical object being hit and smashed. Calf reverb used in audacity. This is a cc0 sound, based on (at time of download) cc0 parrot ar drone 2. 0 take off, flight and landing. This is a flac file. It is lossless like wav but compressed like ogg/mp3. Use audacity or fre:ac to convert quickly to mp3/wav/ogg.
Author: Qubodup
00:00
00:60
Third in a series of 3 consecutive recordings of the sound of summer birdsong in a suburban english setting. This one prominently features the sound of water flushing through an outside kitchen drain into an alleyway. Common suburban evening birdsong can be heard clearly throughout with distant traffic noise in the background. Recorded on a summer evening in june 2016 in southern england using a rode nt-4 microphone in a rycote lyre shock mount, marantz pmd661 and edited using adobe audition.
Author: Hairpin
00:00
14:56
Recording of rain in a small town with some thunder, cars and birds. Plane passing by in the sky. Recorded with sound devices mix-pre-6 ii and two mxl 603s mogami custom mics in din stereo. Recorded in 192khz/32bit. Post editing with rx8: low/high cut with eq to reduce rumble and noise, also gain increased and cut to length. Converted to 320kbps/cbr mp3.
Author: Abid Ritchie
00:00
02:47
Sound recording with a superlux above the 4 lanes of the le mans ring road during rush hour. Right lane in right channel and left lane in left channel. Prise de son avec un superlux au dessus des 4 voies de circulation de la rocade du mans en heure de pointe. Voie de droite dans canal droit et voie de gauche dans canal gauche.
Author: Anilan
00:00
10:19
Copenhagen street. People milling, cars passing, snippets of conversation in danish, birds and aiplanes overhead. Recorded from a second story windowsill near copenhagen's (københavn's) king's garden (kongens have). Stereo mics, internal, tascam dr100 mk3. Internal lowcut at 120hz. Minor eqing done after the fact. Sound is fully loopable. Enjoy!.
Author: Jemtman
00:00
02:25
New york city street at night, with the microphone pointed out of the second story, street-facing windows of a new york city townhouse. Moderate, night traffic. Edited to remove mic bumps and occasional sniffling/coughing. Recorded with a zoom h4n pro on january 04, 2021 around 3am with on-board x-y mic pointed straight down at the street, and traffic coming from each left/right direction.
Author: Ericnorcross
00:00
03:27
Posnetki zvoka motorja aaz 1. 9 td v t3snemalo se je direktno pod motorjem oz. Ob motorju v kombiju z odprtim pokrovom. V vsakem primeru torej manj kot 50 cm stran. 0 - 16s vžig v prvo, po tednu mirovanja in zelo nizkih temperaturah (-15). Ob vžigu je bilo - 5. 16 - 1:04 štantgas in ročno dodajanje plina. Kombi miruje. 1:04 - 2:00 vožnja po cesti od 0 - 60 km/h. 2:00 - 3:26 počasnejša vožnja in klanec. .
Author: Lux
00:00
01:23
Chevrolet caprice from a few meters away, then changed levels, went closer. Engine accellerates, then accellerates again and drives away. Recorded for a teaser of a music video for a simple overlay. Comment me the links when you use this, i'm excited to know! :). I used this sound in those two commissioned clips:. Https://youtu. Be/byqca-0yo-k. Https://youtu. Be/tjd6umicfs0.
Author: Romanholtwick
00:00
05:00
Recorded in pritzker park in the south loop area of downtown chicago. I am sitting towards the back (west) of the park near the end of the path. The microphones are pointed roughly southeast towards the el train tracks. Time of the recording was 5:22pm. Weather was warm, in the upper 80s. Recording details: 2 audio technica at4022s in rycote windshields > sound devices 302 mixer > tascam dr-40 recorder.
Author: Thaighaudio
00:00
00:21
This is the sound of various vehicles driving slowly in a parking lot, with a speed hump not far from the microphone. This was recorded in-person with a tascam dr-40 stereo recorder. Public domain: i have released this audio file into the public domain. It is free for anyone to download, modify, or use without my consent and without attribution - like all freesound audio files should be. Enjoy!.
Author: Evsecrets
00:00
00:32
Wav-file recorded with the zoom h6 with stereo microphone. Recorded inside a staircase from a house from around the 1950s. A woman is walking down the stairs, passes the recorder and walks down to the cellar. You hear the keys in her hand and a car passing in the distance. She opens a door. At some point there is slight handling noise from holding the recorder. Bonny orbit sound library.
Author: Bonnyorbit
00:00
00:01
A classic movie punch sound recreated by hitting a leather car seat with a cricket bat. Recorded using a rode k2 tube mic and a schoeps cmc6, driving the preamps hard and compressing the input, then heavily compressing a number of takes using analog-emulation plugins (including a fairchild 660) and running the mix through waves maxxbass. Then limiting some more and finally adding the swoosh of a riding crop and a non-linear reverb noise tail.
Author: Thebondman
00:00
35:01
A busy sunny summer sunday morning in bellefonte, pennsylvania, us. On this recording you will hear cicadas, traffic on the street at the bottom of the hill, brief voices and a following chorus of barking dogs, police and fire sirens, and church bells. Recorded using a lavalier mic and the hi-q app on an android phone. Gain set to +. 05.
Author: Shinyobjects
00:00
25:03
This is a recording of the six o'clock cicada taken near to the danum valley rain forest lodge in the primary rain forest of borneo. The 6 o'clock cicada is the loud horn type of sound that can be heard in the fist few seconds of the file. Later in the file other insects come in one sounding more like a car alarm.
Author: Astounded
00:00
05:13
Birds tweeting in the garden with sound of freeway (highway) behind. Traffic noises include hum, cars, and trucks. Occasional use of exhaust braking. Birds are in the garden chirping and tweeting. Useful for a urban garden or other similar scenario. Two microphone setup, both are shure sm57s. Placed on two stands, one channel is nearer to freeway, the other is nearer to garden. Recorded with a behringer umc202hd at 192khz and downsampled to 48khz for upload. No other post-processing.
Author: Thejosh
00:00
01:55
I had no part in producing this sound. A girl entered a vehicle and masturbated herself to climax. The story i heard was a lark on a dare, in broad daylight on a sanitized shift knob. The really interesting part was, it wasn't a car owned by either of the girls involved, the darer or the dared, and in fact the owner would have been very upset. If he'd known. I guess she did have access to the keys.
Author: Napro
00:00
05:21
(recorder: zoomh4npro 2018)(microphones: binaural roland cs-10em in-ear monitors). As these are recorded using binaural in-ear mics, i purposefully don't turn my head to keep the sound clean and coming from the same direction. This is traffic on hwy 134 (next to walt disney studios / warner brothers studios) recorded while standing on the hollywood way overpass on 11/16/2018 in burbank, ca. Surprisingly, traffic flow was pretty good and i would assume cars were traveling around 40 to 50 mph. Enjoy,. Christopher c. Courter.
Author: Courter
00:00
03:02
I was standing in the middle of the newport southbank bridge facing the daniel carter beard bridge. You can hear cincinnati on the left and newport on the right while traffic pans from left and right in the stereo image. Gear: zoom h6, xyh-6 x/y capsule (120 degree stereo image), rycote windjammer, mounted on a tripod. Please feel free to leave feedback and ratings. I would love to hear how you put the sound to work.
Author: Rodincoil
00:00
02:24
I was experimentally, recording the garage door opener, but then this happened: next door neighbor kick-starts motorcycle, idles it, an aircraft passes by, and then the motorcyclist rides away. Recorded sound is indirect except for a brief moment when the motorcycle pulls past the open garage door in the alley outside. Set up with schoeps cmc6-uxt/ mk41+mk8 ms stereo in rycote zeppelin on tripod in small suburban single-car garage that faces an alley between lots. Ms-decoded and recorded as l+r channels on sound devices mixpre-6 @ 24/192. Some light post-processing to adjust levels as well as a little compression on the loudest moment.
Author: Chromakei
00:00
01:30
Br class 319 with gec g315bz (gto thyristor) traction motor departing from a standstill, recorded from the centre of the pantograph car. The clip starts with an idle hum, followed by muffled closing doors and power being applied. The hum grows and varies in tone on initial departure, and is joined by an electrical buzz and the echoing high-pitched sound of the traction motor off the surrounding valley. The clip ends with power being removed as the train approaches a station, and crosses a set of points. Note: there is one muffled station announcement within this clip.
Author: Tijaylfs
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00:10
This sound is a superposition of two records. First, i recorded a coffee machine and cut it to extract just the sound of the money that falls in. Then, i recorded the sound of keys and mix it together on audacity. I wanted to make a sound that can be repeated in a loop. So, i copied the record of the coffee machine to give a rhythm to the sound. I tried to cut the sound of the key perfectly to make a loop with the help of the option “search for crosses with zero”. Then, i added view effects. I have changed the amplification in purpose to bring out more the sound of the coffee machine. I also change the reverberation. Gradually, my sound made me think of a music in a video game that i used to play, rayman. It was difficult to describe what the sound was like, but i liked the atmosphere, so i kept it. Then, a friend told me it made him think of a frog noise, and i liked the idea. Code typologie de schaeffer : v’’précisions morphologie :sur le principe de l’écoute réduite, la morphologie du son peut-être décrite comme étant un groupe tonique car nous entendons plusieurs hauteurs. Le son peut être qualifié d’acide et éclatant. Le son paraît plutôt rugueux. Je dirais que le son est dynamique mais que l’attaque n’est pas brutale mais graduelle au moment où l’on entend le son de la machine à café. Le profil mélodique présente des variations plutôt scalaires. Pour finir on entend des hauteurs de sons parmi d’autre son.
Author: Univ Lyon
00:00
08:00
A man is turning buckwheat pancakes on 9 billigs (special pan for galettes). First putting butter on billigs, then spreading and turning the liquid on the billigs, then returning the pancakes with a metalic tool. Then start again all the process two other times. First billig is next to us, billig number nine is 4 meters from us. We can ear his steps, a bird by the window, a car is also crossing the sound field. France, nov2022. Recorded with a schoeps cmc6 mk41 and a schoeps ab ortf, reducted to stereorecorded on sounddevice mixpre648khz, 24 bits, wave stereo.
Author: Bruno
00:00
00:05
I used audacity to synthesize the five-tone chime made by the montreal metro's jeumont train element 41. Backstory: the train itself was an mr-63 type train modified by canron circa 1971, adding a current chopper to the train's started system. The chopper produced an 'idle' tone at around 45 hz, and as the train departed, five tones at frequencies of 90, 120, 180, 240, and 360 hz. Originally there were 3 'elements' (a set of 2 motor cars and 1 trailer car) with the jeumont-schneider current chopper (element 40, made up of cars 81-579, 80-040, and 81-580; element 41, made up of cars 81-581, 80-041, and 81-582; and element 42, made up of cars 81-583, 80-042, and 81-584). During the early 2000s refurbishments, element 40 was retired from service to provide spare parts for the other elements, which were then connected with elements of 'normal' mr-63 trains. Only the 81-579 car remains from element 40. Element 41 and element 42 were then retired in 2018 when the other mr-63 trains were retired.
Author: Chungusa
00:00
00:13
Recording of the tires of a flat bed trailer going over a gravel path. This was from a hayride where i was sitting in the back with a bunch of kids being pulled by the tractor. Recorder was just a couple of feet from the wheel so most of the kids noises and even the tractor engine get drowned out, but still somewhat audible in spots. There are two recordings, one taken from the side with the mic at the wheel and one with the mic under the trailer while recording. (this is the one with the recorder off to the side. ). The sound could also (maybe) be used to mimic a hailstorm. Recorded with a sony icd-px312.
Author: Obxjohn
00:00
06:00
Http://i. Imgur. Com/2vmzp1i. Jpg. Recorded on the east side of south wabash avenue close to the intersection of wabash and east harrison street, in the south loop area of chicago, on 7/20/2013. After recording trains crossing the adjacent tracks i turned the microphones southwest towards the intersection of harrison and wabash. Traffic was heavy and drivers were frequently blowing their horns at each other. A couple of vehicles playing loud music stop at the light. Time of recording was 5:57pm. Weather was warm, in the 80s. Recording details: 2 audio technica at4022s in rycote windshields > sound devices 302 mixer > tascam dr-40 recorder.
Author: Thaighaudio
00:00
01:10
Typical sound of a spanish mobile grinding shop with its high-pitched whistle. It's a quiet sunday morning in madrid's outskirts and this car loudly announces its services with a speaker. Transcription: 'ha llegado el afilador a su domicilio, a la puerta de su casa. Se afilan cuchillos, tijeras, cuchillas de césped, tijeras de podar y toda clase de herramientas. Pídanos presupuesto sin compromiso. El afilador en su propio domicilio. '. Translation: 'the knife sharpener has reached your front door. Knifes, scissors, mowing blades, pruning shears and all kind of tools may be sharpened. Ask for a free quote. The knife sharpener is at your home. '. Recorded with a huawei smartphone.
Author: Nomadas
00:00
00:02
The "annoying" speed chime, turned world famous drift hero by initial d; as it was intended to be heard by the toyota motor corporation. A common issue with these chimes is that the second impact is muted by the impact rod, this was mitigated in this file by holding the chime with a specific side up. This is marked by the second bell properly ringing out after the second impact. This rendition is a pre-timed, loopable, clean version of the chime, recorded from a real imported 86640-12070 "king kong" (kin-kon) chime. Sound created by attaching a power supply set to 12v ~0. 35a in an amateur studio. Like many of my files, these are completely free to use without even giving credit! :) my only request is you tell me where you use them!. These are also called 「速度警告チャイム」(sokudokeikoku chaimu) meaning "speed warning chime" and colloquially 「キンコンチャイム」 (kinkon chaimu) literally derived from the "kin-kon" sound it makes. Dream on‼.
Author: Drooler
00:00
00:21
Recording of the tires of a flat bed trailer going over a gravel path. This was from a hayride where i was sitting in the back with a bunch of kids being pulled by the tractor. Recorder was just a couple of feet from the wheel so most of the kids noises and even the tractor engine get drowned out, but still somewhat audible in spots. There are two recordings, one taken from the side with the mic at the wheel and one with the mic under the trailer while recording. (this is the one with the recorder under the trailer. ). Recorded with a sony icd-px312. .
Author: Obxjohn
00:00
01:18
I did not record this ambience sound! wtfi've left my zoom h1 recorder at a friends place for quite some while until i picked it up today. Accompanied by a few tracks that make sense to us i also found this record, which none of us (not me nor my friend) recognizes as their record. There were two files (which i recognize as takes), so it must be a part of a fictional flick. I've pulled them together here. Here's what i belief it is:ambience of a crime scene with cars approaching, motors running, people alighting and then talking. Seems like the police or other authorities just discovered a corpse.
Author: Fillsoko
00:00
04:00
Http://i. Imgur. Com/05avvhf. Jpg. Recorded on the east side of south wabash avenue close to the intersection of wabash and east harrison street, in the south loop area of chicago, on 7/20/2013. The microphones are facing across the street to the el tracks which cross diagonally across the block at this point. The curvature of the tracks causes the squeaking of the wheels. Trains heading into the loop (north) tend to travel more slowly than those heading south. Cars accumulate at the intersection of harrison and wabash to the south (left). Time of recording was 5:41pm. Weather was warm, in the 80s. Recording details: 2 audio technica at4022s in rycote windshields > sound devices 302 mixer > tascam dr-40 recorder.
Author: Thaighaudio
00:00
00:15
Vidrinho. Wav, som de um conjunto de garrafas de vidro juntas, batendo uma nas outras, pode ser usado em qualquer tipo de filme onde existam carros ou caminhões transportando alguma coisa de vidro, gravado no estúdio da escola ort do rio de janeiro, em fevereiro de 2022. Os equipamentos são: um microfone- shotgun shure vp89, e uma placa de áudio - behringer u-phoria umc404 hd, foi um exercício de foley. Vidrinho. Wav, the sound of a set of glass bottles together, hitting each other, can be used in any type of film where there are cars or trucks transporting something made of glass, recorded at the ort school studio in rio de janeiro, in february 2022. The equipment is: a shure vp89 shotgun microphone, and an audio card - behringer u-phoria umc404 hd, it was a foley exercise.
Author: Escola Ort
00:00
01:03
Trying to start a 1983 volvo 245 after a stop at a gas station. First we hear the seatbelt warning signal after the driver turns the ignition on. The first start attempt fails. The two following attempts fail because the starter fails to engage with the flywheel, creating a very loud and unpleasant sound. There is some reverberation from the metal roof of the gas station. At 00:24, the driver remarks "he's doing it again!". The fourth attempt succeeds in starting the engine after a rather long cranking. We then drive off and we also hear some squeaking from the steering wheel. Throughout the recording we hear breathing noises from the driver (80 year old man, smoker). The recording was made in the front passanger seat with the window open, that's why there a very noticable difference between the left and right channel. Recorder: edirol r-09, 48khz wave/24-bit, cropped with cool edit pro, re-saved as 48khz wave/24-bit and compressed with flac. No other pp. Edirol r-09 settings: low cut: off, mic gain: low, agc: off. Recorded on june 15, 2012 in åkersberga, sweden.
Author: Nissse
00:00
03:13
When i was eight years old my older brother told me to go play in traffic. I'm well-known for taking dares and mostly getting away with it, and i did! the only reason it freaked him out was because if i'd gotten hurt, he would have been in trouble. Ah, family. In honor of my stupid bro i decided to capture this sound for you. My friend asked if i'd gotten my recording and i, being myself, complained that although i'd gone out in daylight wearing a halter and short-shorts, no one had even slowed down to look. "take it to the next level," he said. "walk right out on the interstate in the nude. ”i smiled. "think i'd stop traffic?""oh, for sure. Truckers are curious, and most of them have never seen a dumb naked bitch smushed on the concrete, still clutching her iphone. "what fun is life if you can't laugh? coming soon: “fapping with sandpaper. Wav”.
Author: Nuncaconoci
00:00
00:01
One friday night, me and my partner were eating dinner, and we both heard a click. She perks up, "what was that?" and i said "the dryer is running, probably something in it" and she goes "no it was inside" (our dryer is like a back door outside porch kinda deal). I noticed it came from inside as well, in the kitchen, but mentally shrugged it off because lasagna. But now i know she heard it inside too, so i walk in the kitchen where the sound came from and don't see anything moving or on. I took note of where my cats were in case anything was being chewed on: one in bed, one on the couch, they aren't chewing on anything or are even near the clicking sound, so back to dinner. About 45 minutes later, dinner is wrapped up, my partner is asleep and i start turning off all the lights. When i turn the kitchen lights off, there is a light that stays on in the corner. I have a car battery recharger there: it has usb ports in case ya lose power, charger cables, and a flashlight attached on the side. . . . Which is on. I turn it off: exact same click that i heard earlier. Do i have a ghost?.
Author: Sweet Niche
00:00
07:20
Recorded in my dad's bedroom with lifecam hd3000 webcam. This is a much better recording than my previous oxygen concentrator file, as i hauled my desktop into the bedroom at the other end of the apartment where the machine now is, when i was home alone. The webcam is on the bed about 3 or 4 feet from the machineat the beginning of the file you hear me flip the big switch and the machine comes on with a long on beep and thumps. I edited it to start then. At 00:1. 8 what i suspect is the water pump comes on, though i may be wrong. That's when the gurgling starts though. The machine has a small reservoir for distilled water to moisten the airflow. A cup or two lasts several daysyou'll hear various hisses and thumps in a 15. 6 second cycle as it runs. At 03:03 i flip the big switch to shut the machine off, and it bubbles and gurgles away for the rest of the file, as water i assume slowly perculates back into the reservoir, the bubbling getting quieter and quieter until it doesn't even sound like bubbling anymore, until it finally ticks to a stop. At 03:16 you hear me step as i get my foot loose from the mic cord lol. At 04:13 the furnace shuts down as a car finishes going by outside in the bass register, faint traffic noises and the furnace being the only background noises you'll hear aside from my moving around a couple times, and a faint bluejay at the end. At about 07:00 you can barely hear the machine anymore, but i could hear a faint ticking with my own ears. At 07:04 the furnace comes back on. At 07:08 you'll hear a bluejay faintly calling outside and a car going by outside after, which finishes the file at 07:20. I edited out my walking to the computer to shut the recording down. From wikipediaoxygen concentrators typically use pressure swing adsorption technology and are used very widely for oxygen provision in healthcare applications, especially where liquid or pressurised oxygen is too dangerous or inconvenient, such as in homes or in portable clinics. Oxygen concentrators are also used to provide an economical source of oxygen in industrial processes, where they are also known as oxygen gas generators or oxygen generation plants. Oxygen concentrators utilize a molecular sieve to adsorb gasses and operate on the principle of rapid pressure swing adsorption of atmospheric nitrogen onto zeolite minerals and then venting the nitrogen. This type of adsorption system is therefore functionally a nitrogen scrubber leaving the other atmospheric gasses to pass through. This leaves oxygen as the primary gas remaining. Psa technology is a reliable and economical technique for small to mid-scale oxygen generation, with cryogenic separation more suitable at higher volumes and external delivery generally more suitable for small volumes. [1]at high pressure, the porous zeolite adsorbs large quantities of nitrogen, due to its large surface area and chemical character. After the oxygen and other free components are collected the pressure drops which allows nitrogen to desorb. An oxygen concentrator has an air compressor, two cylinders filled with zeolite pellets, a pressure equalizing reservoir, and some valves and tubes. In the first half-cycle the first cylinder receives air from the compressor, which lasts about 3 seconds. During that time the pressure in the first cylinder rises from atmospheric to about 1. 5 times normal atmospheric pressure (typically 20 psi/138 kpa gauge, or 1. 36 atmospheres absolute) and the zeolite becomes saturated with nitrogen. As the first cylinder reaches near pure oxygen (there are small amounts of argon, co2, water vapour, radon and other minor atmospheric components) in the first half-cycle, a valve opens and the oxygen enriched gas flows to the pressure equalizing reservoir, which connects to the patient's oxygen hose. At the end of the first half of the cycle, there is another valve position change so that the air from the compressor is directed to the 2nd cylinder. Pressure in the first cylinder drops as the enriched oxygen moves into the reservoir, allowing the nitrogen to be desorbed back into gas. Part way through the second half of the cycle there is another valve position change to vent the gas in the first cylinder back into the ambient atmosphere, keeping the concentration of oxygen in the pressure equalizing reservoir from falling below about 90%. The pressure in the hose delivering oxygen from the equalizing reservoir is kept steady by a pressure reducing valve. Older units cycled with a period of about 20 seconds, and supplied up to 5 litres per minute of 90+% oxygen. Since about 1999, units capable of supplying up to 10 lpm have been available.
Author: Kbclx
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