DIY Astable Multivibrator thiab piav qhia nws ua haujlwm li cas: 4 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:27

Astable Multivibrator yog Circuit Court uas tsis muaj lub xeev ruaj khov thiab nws cov teeb liab tso tawm tsis tu ncua ntawm ob lub xeev tsis ruaj tsis khov, qib siab thiab qib qis, yam tsis muaj kev cuam tshuam sab nraud.

Cov ntaub ntawv tsim nyog:

2x68k ua

2 x 100μF electrolytic capacitors

2x LED liab

2 x NPN transistors

Kauj Ruam 1: Kauj Ruam Ib: Soj Ntsuam Cov Tiv Thaiv thiab LEDs thiab NPN Transistors rau hauv PCB

Thov nco ntsoov tias cov ceg ntev ntawm LED yuav tsum tau ntxig rau hauv lub qhov nrog '+' cim ntawm PCB. Lub tiaj tiaj ntawm lub transistor yuav tsum nyob rau tib sab ntawm txoj kab uas hla ntawm ib nrab ib ncig ntawm PCB.

Kauj Ruam 2: Kauj Ruam Ob: Muab Cov Hluav Taws Xob Hluav Taws Xob Hluav Taws Xob rau hauv PCB

Electrolytic Capacitors muaj qhov sib txawv uas txhais ceg ntev yog anode thaum lub luv luv yog cathode. Qhov kev sib tw Astable Multivibrator no yooj yim heev uas nws yog cov khoom siv DIY zoo tshaj plaws rau koj kom kawm paub txog kev them nqi hluav taws xob thiab tso tawm. Txog rau theem no DIY tau ua tiav. Qhov tseem ceeb tshaj plaws ntawm qhov kev qhia no yog kev tshuaj xyuas.

Kauj Ruam 3: Piav Qhia Li Cas Astable Multivibrator Ua Haujlwm

Lub zog hluav taws xob ntawm qhov kev sib tham no tau pom zoo ntawm thaj tsam ntawm 2V txog 15V, kuv li yog 2.7V. Koj muaj kev ywj pheej xaiv qhov hluav taws xob muab los ntawm 2V txog 15V raws li koj xav tau. Thaum txuas cov khoom siv hluav taws xob nrog cov kab hluav taws xob no, qhov tseeb, ob lub capacitors C1 thiab C2 pib them thiab nws nyuaj hais tias lub tshuab hluav taws xob twg yuav tau txais txog +0.7V ntawm nws sab cathode uas yuav tig lub hauv paus ntawm NPN transistor thawj zaug txawm tias lawv tau cim los ntawm tus nqi tib yam ntawm lub peev xwm. Vim tias txhua lub Cheebtsam yuav muaj kev ua siab ntev, lawv tsis yog 100% cov khoom lag luam zoo tshaj. Feem ntau, thaum qhov hluav taws xob ntawm lub hauv paus ntawm transistor nce mus txog 0.7V lub transistor yuav ua thiab nws dhau los ua haujlwm.

(1) Cia peb hais tias Q1 tau ua hnyav thiab Q2 nyob ntawm lub xeev thiab LED1 yog lub teeb thiab LED2 tau tawm. Tus neeg sau khoom ntawm Q1 yuav raug tso tawm qis raws li sab laug ntawm C1. Hauv txoj haujlwm no qhov tso tawm qis tsis tau txhais hais tias 0V, nws yog kwv yees li 2.1V, qhov no yog txiav txim siab los ntawm cov khoom siv hluav taws xob uas koj tau thov rau hauv Circuit Court. Thiab tam sim no C1 pib them nyiaj ntawm R1 thiab nws sab xis dhau los ua qhov zoo mus txog thaum nws mus txog qhov ntsuas hluav taws xob txog +0.7V. Peb tuaj yeem pom los ntawm daim duab qhia chaw uas sab xis ntawm C1 tseem txuas nrog lub hauv paus ntawm transistor, Q2. (2) Lub sijhawm no Q2 tab tom ua haujlwm hnyav. Kev nce tus neeg sau khoom tam sim no dhau los ntawm Q2 tam sim no ua rau qhov poob qis thoob plaws LED2, thiab Q2 cov khoom siv hluav taws xob poob, ua rau sab xis ntawm C2 poob sai hauv qhov muaj peev xwm. Nws yog tus cwj pwm ntawm lub tshuab hluav taws xob uas thaum qhov hluav taws xob ntawm ib sab hloov pauv sai, lwm sab kuj tseem muaj kev hloov pauv zoo sib xws, yog li ntawd sab xis ntawm C2 ntog sai los ntawm cov khoom siv hluav taws xob rau cov zis qis (2.1V), sab laug yuav tsum poob hauv qhov hluav taws xob los ntawm tus nqi zoo sib xws. Nrog Q1 ua, nws lub hauv paus yuav tau txog 0.7V, yog li Q2 ua, lub hauv paus ntawm Q1 poob rau 0.7- (2.7-2.1) = 0.1V. Tom qab ntawd LED1 tawm thiab LED2 yog lub teeb. Txawm li cas los xij, LED2 tsis nyob ntev. C2 tam sim no pib them los ntawm R2, thiab ib zaug qhov hluav taws xob ntawm sab laug (Q1 puag) nce txog +0.7V lwm qhov kev hloov pauv sai ntawm lub xeev tau tshwm sim, Q1 tau ua haujlwm, LED1 tau teeb, yog li Q1 ua, lub hauv paus ntawm Q2 ntog rau 0.1V, Q2 dhau los ua haujlwm, LED2 tawm. Q rau thiab tawm ntawm Q1 thiab Q2 tau rov ua dua ib ntus, lub sijhawm ua haujlwm, T txiav txim siab los ntawm lub sijhawm tas li RC, T = 0.7 (R1. C1+R2. C2).

Kauj ruam 4: Waveforms Qhia

Kev txiav tawm ntsug ntawm kuv oscilloscope yog 0V, thiab kuv tau cim cov lus piav qhia ntawm txhua daim duab duab. Qhov no yog qhov ntxiv rau qib peb. Txhawm rau tau txais cov ntaub ntawv rau kev kawm thov mus rau Mondaykids.com