Infrared Transmitter: 4 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:25

Kab lus no qhia koj yuav ua li cas thiaj ua rau infra red analogue transmitter.

Nov yog qhov qub Circuit Court. Tam sim no laser diodes tau siv los xa cov cim digital ntawm cov iav fiber ntau.

Lub tshuab hluav taws xob no tuaj yeem siv los xa cov teeb liab suab ntawm infrared. Koj yuav xav tau tus neeg txais xov xwm txhawm rau txheeb xyuas lub teeb liab xa mus. Lub teeb liab tsis tas yuav hloov kho.

Khoom siv

Cheebtsam: NPN BJT lub zog hloov hluav taws xob, lub dab dej kub, thaiv cov xov hlau, lub rooj sib txig sib luag, 1 kohm resistor - 5, 100 ohm resistor - 3 (nyob ntawm tus lej xa khoom uas koj siv), 100 uF bipolar capacitor, 1 Megohm potentiometer - 2, lub zog qhov chaw (3 V lossis 4.5 V - tuaj yeem siv nrog AA/AAA/C/D roj teeb).

Cov cuab yeej: hlau stripper, pliers.

Cov khoom siv xaiv tau: cov kab laug sab, 1 hli hlau xaim, hloov pauv kub.

Yeem cov cuab yeej: cov hlau txuas, USB oscilloscope.

Kauj ruam 1: Tsim Circuit Court

Tsis txhob nce Rb1 siab dua 1 kohm. Txwv tsis pub, transistor yuav tsis saturate.

Kuv ua qauv tus duab hluav taws xob xa hluav taws xob nrog plaub diodes. Yog tias txhua qhov diodes muaj qhov muaj peev xwm ntawm 0.7 V dua li tag nrho cov khoom siv hluav taws xob yuav yog 2.8 V lossis kwv yees li 3 V. Qhov no yog qhov hluav taws xob poob thoob kuv lub tshuab xa hluav taws xob.

Ra resistor tuaj yeem muaj txiaj ntsig los ntawm 1 kohm rau 1 Megohm.

Kuv pom tias ntxiv Rc tus nqi rau transistor Circuit tau nce qhov nce ntawm lub suab nrov no. Thaum cov tswv yim hluav taws xob tsawg heev lub transistor raug kaw, qhov tsis ncaj ncees tam sim no nkag mus rau hauv lub hauv paus transistor nrog Vce (cov khoom siv hluav taws xob tso tawm ze ntawm xoom). Rc resistor nce lub transistor Vce voltage thaum lub transistor OFF. Koj tuaj yeem sim Rc tus nqi ntawm 10 kohms lossis txawm tias 100 kohms thiab pom tias qhov no yuav ua rau nce ntxiv vim tias tus nqi Rc qis (txawm tias 1 kohm) tsim kev thauj khoom cuam tshuam rau ntawm transistor cov zis. Txawm li cas los xij, txuas siab Rc resistor qhov tseem ceeb zoo li tsis siv Rc resistor txhua.

Txawm li cas los xij, ntxiv qhov ntxiv Rc resistor rau lub hom phiaj dav dav transistor LED cov ntsuas tsuas yog txo qhov nce thiab yog li tsis tau siv hauv cov ntawv:

www.instructables.com/id/LED-Small-Signal-Detector/

www.instructables.com/id/Ultrasonic-Alien/

Nws yog qhov zoo tshaj plaws los xav tias txhua hom transistor nws muaj nws tus yam ntxwv tshwj xeeb.

Kauj Ruam 2: Simulation

PSpice simulation qhia qhov nce siab heev thiab qhov no yog vim li cas kuv txuas lub zog ntsuas qhov ntsuas kom nkag mus.

Cov txiaj ntsig potentiometer siab yog cuam tshuam rau qhov siab dhau lim lim. Txawm li cas los xij, tsis txhob siv potentiometers qis dua 1 kohms. Infact zoo dua koj siv tsawg kawg 10 kohms kom tsis txhob muaj kev puas tsuaj rau cov suab tso tawm.

Kauj ruam 3: Tsim Circuit Court

Kuv siv lub zog muaj zog tiv taus. Koj tsis xav tau lub zog tiv thaiv hluav taws xob siab rau lub Circuit Court no. Tej zaum Rd1 thiab Rd2 xav tau lub zog loj yog tias koj nce cov khoom siv hluav taws xob thiab siv cov duab hluav taws xob hluav taws xob tam sim no.

Kuv tau hais qhia 3 V lub zog xa hluav taws xob hauv kev tsim hluav taws xob vim tias qee qhov infra -red diodes muaj qhov siab tshaj plaws rau qhov tsis ncaj ncees qhov hluav taws xob tsuas yog 2 V.

= (3 V - 2 V - 0.25 V) / 100 ohms

= 0.75 V / 100 ohms = 7.5 mA

Txawm li cas los xij, cov diodes uas kuv siv tau muaj qhov siab tshaj plaws rau qhov tsis ncaj ncees qhov hluav taws xob ntawm 3 V. Qhov no yog vim li cas kuv thiaj siv 4.5 V mov (tsis yog 3 V) thiab qhov siab tshaj plaws diode tam sim no hauv kuv qhov Circuit tam sim no yog:

IcMax = (Vs - Vd - VceSat) / Rc

= (4.5 V - 3 V - 0.25 V) / 100 ohms

= 1.25 V / 100 ohms = 12.5 mA

Kauj ruam 4: Xeem

Kuv tau qhia txog kev txo hwj chim lub zog vim tias lub transistor amplifier tau nce siab heev, yog li saturating cov zis uas tsis tsim nyog rau lub teeb liab uas xav tau kev tawm suab thiab xa tawm.

Kuv txuas cov kab liab liab mus rau ib qho ntawm cov infrared transmitter nodes (lub node thib ob txuas nrog lub zog xa khoom).

Kuv lub tshuab tsim hluav taws xob muaj qhov tso tawm ntau tshaj ntawm 15 V ncov lossis 30 V ncov mus rau qhov siab. Txawm li cas los xij, rau cov kab lus saum toj no kuv teeb lub tshuab hluav taws xob teeb tsa kom qis tshaj plaws. Kuv USB oscilloscope tab tom qhia qhov ntsuas tsis raug rau lub teeb xiav channel. Lub teeb liab tawm tswv yim tau teeb tsa txog 100 mV ncov.

Kuv lub xov tooj cua tsis tau sim nrog lub tshuab txais infrared. Koj tuaj yeem ua qhov no ntawm koj tus kheej.