Siv LM3915 Logarithmic Dot/Bar Display Driver IC: 7 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:26

LM3915 muab txoj hauv kev yooj yim los tso saib cov lej logarithmic voltage siv ib lossis ntau pawg ntawm kaum LEDs nrog qhov tsawg kawg ntawm kev fuss. Yog tias koj xav ua tus ntsuas VU, koj yuav tsum siv LM3916 uas peb yuav npog hauv qhov kawg ntawm qhov trilogy no.

Hloov chaw ntawm txhua tus LED sawv cev rau qib siab ib yam li LM3914, txhua lub LED txuas nrog LM3915 sawv cev rau 3 dB (decibel) hloov pauv hauv qib zog ntawm lub teeb liab. Xav paub ntau ntxiv txog decibels, txheeb xyuas Wikipedia. Txhawm rau qhia cov kev hloov pauv qib no peb yuav ua raws ob peb yam piv txwv uas koj tuaj yeem siv hauv koj tus kheej cov phiaj xwm thiab vam tias yuav muab tswv yim rau koj rau yav tom ntej. Keeb kwm los ntawm National Semiconductor, LM391X series tam sim no tau ua los ntawm Texas Instruments.

Koj tuaj yeem xaj LM3915 ICs los ntawm PMD Way nrog kev xa khoom dawb, thoob ntiaj teb.

Kauj ruam 1: Pib

Koj yuav xav tau cov ntaub ntawv LM3915, yog li thov rub tawm qhov ntawd thiab khaws nws raws li kev siv. Ua ntej - rov qab mus rau qhov pib. LM3915 tswj kaum LEDs. Nws tswj hwm qhov tam sim no dhau los ntawm LEDs nrog kev siv tsuas yog ib tus tiv thaiv, thiab LEDs tuaj yeem tshwm sim hauv kab kab lossis ib qho 'teev' thaum siv. LM3915 muaj kaum-theem faib hluav taws xob, txhua theem thaum mus txog yuav pom teeb pom kev sib xws LED (thiab cov hauv qab nws hauv qib ntsuas hom).

Cia peb xav txog qhov yooj yim tshaj plaws ntawm cov piv txwv (los ntawm nplooj ntawv ob ntawm cov ntaub ntawv) - qhov yooj yim logarithmic zaub ntawm qhov hluav taws xob ntawm 0 thiab 10V.

Kauj ruam 2:

Tom qab tsim lub Circuit koj tuaj yeem txuas lub teeb liab los ntsuas ntawm tus pin 5, thiab GND rau tus pin 2. Peb tau tsim lub Circuit raws nraim raws li tau hais los saum toj no ntawm qee daim phiaj rau kev ua qauv qhia, nrog qhov sib txawv tsuas yog siv 8.2kΩ resistor rau r2.

Kauj ruam 3:

Txhawm rau qhia qhov no hauv kev nqis tes peb siv lub teeb liab sib txawv ntawm AC voltage - sine wave nyob ib puag ncig 2 kHz. Hauv cov vis dis aus hauv qab no, koj tuaj yeem pom qhov sib piv ntawm lub teeb liab qhov hluav taws xob tiv thaiv cov LEDs tau teeb pom kev zoo, thiab koj yuav pom cov logarithmic voltage nce sawv cev los ntawm LEDs.

Zoo uas yog kev lom zem heev, thiab muab tswv yim rau koj txog qhov ua tau nrog LM3915.

Kauj Ruam 4: Tso Tawm Cov Teeb Meem Tsis Zoo

Hauv cov xwm txheej tsis yog theoretical koj cov lus tawm tswv yim yuav tsis yooj yim nyob nruab nrab ntawm 0 thiab 10 V. Piv txwv li, ntawm no yog daim duab DSO random los ntawm kev ntsuas lub mloog pob ntseg tso tawm ntawm kuv lub khoos phis tawj thaum ua qee yam suab paj nruag.

Kauj ruam 5:

Txawm hais tias nws yog AC teeb liab peb yuav kho nws li DC kom yooj yim. Yog li txhawm rau tso tawm qhov tsis sib xws DC qhov teeb liab qis peb yuav txo qhov ntau ntawm cov zaub rau 0 ~ 3V DC. Qhov no yog ua tiav siv tib txoj hauv kev ib yam li nrog LM3914 - nrog lej thiab sib txawv resistors.

Xav txog cov qauv. Raws li koj tuaj yeem pom LED tam sim no (Iled) yog qhov yooj yim, txawm li cas los xij peb yuav xav tau daws rau R1 thiab R2 nrog thawj cov mis kom tau txais peb qhov xav tau Vref ntawm 3V. Rau peb qhov piv txwv kuv siv 2.2kΩ rau R2 uas muab tus nqi ntawm 1.8kΩ rau R1. Txawm li cas los tso cov txiaj ntsig no hauv ILED tus lej muab qhov zoo nkauj tam sim no rau LEDs, txog 8.3 mA.

Nyob thiab kawm - yog li siv sijhawm sim nrog qhov muaj txiaj ntsig yog li koj tuaj yeem ua raws li Vref thiab ILED xav tau.

Kauj Ruam 6:

Txawm li cas los xij hauv daim vis dis aus no peb muaj Vref ntawm 3V thiab qee cov nkauj hauv computer los ua piv txwv los ntawm qhov hluav taws xob qis DC. Qhov no tsis yog VU meter!

Ib zaug ntxiv vim qhov hloov pauv sai ntawm qhov hluav taws xob, muaj xiav ntawm qhov siab tshaj plaws nyob rau lub sijhawm thiab 0V.

Kauj Ruam 7: Txuas Ntau LM3915s

Qhov no tau npog zoo hauv cov ntaub ntawv, yog li nyeem nws kom paub ntau ntxiv txog kev siv ob LM3915s. Ntxiv rau muaj qee qhov piv txwv zoo hauv cov ntaub ntawv, piv txwv li 100W lub zog ntsuas lub suab ntawm nplooj 26 thiab lub ntsuas kev co (siv lub piezo) ntawm nplooj 18.

Cov ntawv tshaj tawm no tau coj tuaj rau koj los ntawm pmdway.com - txhua yam rau cov kws tsim khoom thiab cov khoom siv hluav taws xob, nrog kev xa khoom dawb thoob ntiaj teb.