Cov txheej txheem:
Video: Yooj Yim (thiab Quaj) Pulse Width Modulation (PWM) Nrog 555 Timer: 3 Kauj Ruam
2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:31
Ib qho yooj yim Circuit Court rau DC Tsav nrawm tswj (kiv cua nrawm tswj, lub teeb / LED dimming thiab lwm yam) siv 555 lub sijhawm. Qee leej yuav sib cav tias qhov no tsis yog txoj hauv kev muaj txiaj ntsig tshaj plaws, tab sis hav (nyeem lub npe), nws yooj yim, thiab nws ua haujlwm. Txheeb cov vis dis aus tawm. Muaj cov duab thiab piav qhia ntawm no. Pulse Width Modulation (PWM) Muab yooj yim PWM yog txheej txheem ntawm kev hloov lub zog ON thiab OFF rau lub cuab yeej hauv mem tes ntawm qhov tshwj xeeb zaus. Tib txoj hauv kev siv hauv kev lag luam teeb dimmers, DC lub zog tswj lub zog, CPU kiv cua tswj kev tswj hwm thiab lwm yam Qhov ntawd yog qhov peb nrhiav kom ua tiav ntawm no.
Kauj Ruam 1: Tshooj Npe
Daim ntawv teev npe 1) 555 timer IC - 12) 100K sib txawv resistor - 13) 1N4148 Diode - 24) 100nF capacitor - 2Cov 555 Timer ICThe 555 timer yog sib cav yog ib qho IC nrov tshaj plaws uas tau ua. Muaj ntau txhiab tus peev txheej hauv online yog tias koj xav ua kom tob dua rau hauv qhov kev kawm. Kuv tsuas yog yuav muab cov lus piav qhia yooj yim cuam tshuam ncaj qha rau buildPIN 1 - GroundDC GroundPIN 2 - Ua rau Thaum LOW, nws ua rau tus pin tso tawm kom siab. Qhib thaum qhov hluav taws xob poob qis dua 1/3 ntawm +V. PIN 3 - OutputOutput yog HIGH thaum pib tus pin yog LOW. Cov zis yog LOW thaum tus lej pib yog HIGH. Cov zis tawm yog LOW thaum rov pib tus pin LOW. Output tus pin tuaj yeem siv los yog sinkcurrent. PIN 4 - ResetShort rau +V thaum tsis siv. PIN 5 - Tswj VoltageGrounded los ntawm lub tshuab hluav taws xob thaum tsis siv. /3 ntawm +V, tus pin no yuav ua rau Output raug tsav LOW. PIN 7 - DischargeGrounded thaum tus pin tso tawm mus HIGH. PIN 8 - +VDC Power
Kauj Ruam 2: Nws Ua Haujlwm Li Cas
Thaum nws ua haujlwm li cas, C1 lub tshuab hluav taws xob yuav pib nyob hauv lub xeev tso tawm. Yog li, Tus Ntaus (tus pin 2) yuav LOW, tsav lub Output (tus pin 3) kom HIGH. Kev tso tawm (tus pin 7) mus siab thiab mus rau hauv av. Lub voj voog pib. Qhov siab tshaj tawm yuav ua rau C1 lub capacitor raug them los ntawm txoj kev R1 thiab D1. Thaum C1 qhov hluav taws xob nce mus txog 2/3 ntawm +V, Lub Threshold (tus pin 6) yuav qhib thiab tsav tawm (Pin 3) LOW. Tawm (tus pin 7) mus qis. Lub sijhawm nws siv rau C1 kom them yog nyob ntawm txoj haujlwm ntawm R1. Since Output (tus pin 3) tam sim no LOW, capacitor C1 yuav pib tso tawm los ntawm D2 thiab R1 txoj kev. Thaum qhov hluav taws xob ntawm C1 poob qis dua 1/3 ntawm +V, Ua rau (tus pin 2) yuav qis dua, tsav tsheb tawm (tus pin 3) mus rau HIGH, thiab Tshem Tawm (tus pin 7) mus HIGH thiab luv luv rau hauv av. Lub voj voog rov ua nws tus kheej. Koj tej zaum tau pom los ntawm tam sim no tias lub Circuit Court siv Discharge (tus pin 7) los tsav lub cav, yooj yim los ntawm kev mus hauv av hauv txhua lub voj voog. Koj tuaj yeem ntxiv qee qhov kev tiv thaiv yog tias koj txhawj xeeb txog EMF rov qab los ntawm lub cav. Pin 4 thiab 5 tsis siv, thiab tus pin 1 tsuas yog khi rau hauv av. Lub Circuit Court tuaj yeem siv nruab nrab ntawm +3v txog +18v. Zaus yog nyob ib puag ncig 144Hz. Nco ntsoov tias, ob npaug tus nqi ntawm C1 yuav txo qis ib nrab, peb npaug yuav txo qis mus rau 1/3, thiab ntxiv rau.
Kauj Ruam 3: Yog Nws
Zoo siab tinkering. Zoo siab los xauj kuv cov blog rau lwm yam khoom
Pom zoo:
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