Kho Ob Chav Tawm Tawm Tawm Tawm Tawm Cov Khoom Siv Hluav Taws Xob: 10 Cov Kauj Ruam (nrog Duab)

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

Nta:

• AC - DC Kev Hloov pauv Ob npaug tso zis hluav taws xob (Zoo - Hauv av - Tsis Zoo)
• Kho tau txoj kab zoo thiab tsis zoo
• Tsuas yog Ib Qhov Tawm Tawm AC hloov pauv
• Cov suab nrov tawm (20MHz-BWL, tsis muaj thauj khoom): Ib puag ncig 1.12mVpp
• Tsawg suab nrov thiab tso zis ruaj khov (zoo rau lub zog Opamps thiab Pre-amplifiers)
• Cov zis hluav taws xob: +/- 1.25V txog +/- 25V Tshaj tawm tam sim no: 300mA txog 500mA
• Pheej yig thiab yooj yim rau cov laug (tag nrho cov khoom ntim yog DIP)

Qhov muab ob npaug tso tawm suab qis zog yog qhov khoom siv tseem ceeb rau txhua tus neeg nyiam siv hluav taws xob. Muaj ntau qhov xwm txheej uas yuav tsum tau muab ob npaug tso zis hluav taws xob tsim nyog xws li tsim ua ntej lub tshuab ua kom nrov thiab ua kom lub zog OPAMPs. Hauv kab lus no, peb tab tom tsim lub zog xa hluav taws xob uas tus neeg siv tuaj yeem hloov kho nws txoj kab zoo thiab tsis zoo ntawm nws tus kheej. Ntxiv mus, tsuas yog ib qho tib leeg tso zis AC hloov pauv tau siv los ntawm cov tswv yim.

[1] Kev Txheeb Xyuas Circuit

Daim duab 1 qhia txog daim duab qhia chaw ntawm lub cuab yeej. D1 thiab D2 yog rectifier diodes. C1 thiab C2 tsim thawj theem txo suab nrov.

Kauj Ruam 1: Daim duab 1, Daim duab qhia chaw ntawm Tsawg Lub Hwj Huam Muaj Zog

R1, R2, C1, C2, C3, C4, C5, thiab C6 tsim qhov qis RC lim uas txo cov suab nrov los ntawm ob qho zoo thiab tsis zoo. Tus cwj pwm ntawm cov lim no tuaj yeem tshuaj xyuas ob qho tib si hauv kev xav thiab kev coj ua. Ib qho oscilloscope nrog cov phiaj xwm phiaj xwm tuaj yeem ua qhov ntsuas no, xws li Siglent SDS1104X-E. IC1 [1] thiab IC2 [2] yog cov kev cai tseem ceeb ntawm cov khoom siv hluav taws xob no.

Raws li IC1 (LM317) cov ntaub ntawv: "LM317 lub cuab yeej yog lub khoos phis tawj ntsuas qhov ntsuas hluav taws xob zoo uas muaj peev xwm muab ntau dua 1.5 A tshaj qhov tso tawm hluav taws xob ntau ntawm 1.25 V txog 37 V. teeb qhov hluav taws xob tso tawm. Cov cuab yeej muaj cov kab kev coj ua raug cai ntawm 0.01% thiab kev tswj hwm ib txwm muaj ntawm 0.1%. Nws suav nrog kev txwv tam sim no, kev tiv thaiv kom sov ntau dhau, thiab kev tiv thaiv thaj chaw nyab xeeb. Kev tiv thaiv ntau dhau tseem ua haujlwm tau txawm tias ADJUST lub davhlau ya nyob twg raug txiav tawm ".

Raws li nws tau pom meej, tus tswj hwm no qhia txog kab zoo thiab thauj cov cai tswj hwm, yog li peb tuaj yeem cia siab tias yuav tau txais cov tsheb nqaj hlau ruaj khov. Qhov no zoo ib yam rau IC2 (LM337). Qhov sib txawv tsuas yog tias cov nti no tau siv los tswj qhov tsis zoo voltages. D3 thiab D4 yog siv los tiv thaiv.

Cov diodes muab txoj hauv kev tso tawm hluav taws xob qis kom tiv thaiv cov khoom siv hluav taws xob (C9 thiab C10) los ntawm kev tso tawm mus rau qhov tso tawm ntawm cov tswj hwm. R4 thiab R5 tau siv los kho qhov hluav taws xob tso zis. C7, C8, C9, thiab C10 tau siv los lim cov suab nrov uas tseem tshuav.

[2] PCB Txheej Txheem

Daim duab 2 qhia txog PCB txheej txheem ntawm Circuit Court. Nws tau tsim los ntawm ib txheej PCB pawg thawj coj thiab txhua pob khoom ntim khoom yog DIP. Yooj yim yooj yim rau txhua tus los ua ke cov khoom siv thiab pib siv lub cuab yeej.

Kauj Ruam 2: Daim duab 2, PCB Txheej Txheem ntawm Cov Khoom Siv Hluav Taws Xob

Kuv siv SamacSys cov tsev qiv ntawv tiv toj rau IC1 [3] thiab IC2 [4]. Cov tsev qiv ntawv no yog pub dawb thiab tseem ceeb dua ua raws cov qauv IPC hneev taw. Kuv siv Altium, yog li kuv ncaj qha teeb tsa lub tsev qiv ntawv siv Altium plugin [5]. Daim duab 3 qhia txog cov khoom xaiv. Cov plugins zoo sib xws tuaj yeem siv rau KiCad thiab lwm yam CAD software.

Kauj Ruam 3: Daim duab 3, SamacSys Cheeb Tsam Tsev Kawm Ntawv (AD Plugin) rau IC1 (LM137) thiab IC2 (LM337)

Daim duab 4 qhia pom 3D pom ntawm PCB pawg thawj coj saib.

Kauj Ruam 4: Daim duab 4, 3D View of the Final PCB Board

[3] Sib dhos thiab Xeem Daim Duab 5 qhia txog pawg thawj coj ua ke. Kuv txiav txim siab siv 220V rau 12V hloov pauv kom tau txais qhov siab tshaj +/- 12V ntawm qhov tso tawm. Daim duab 6 qhia txog qhov yuav tsum tau thaiv.

Kauj Ruam 5: Daim duab 5, Sib dhos Circuit Board

Kauj Ruam 6: Daim duab 6, Transformer thiab Circuit Wiring Diagram

Los ntawm tig R4 thiab R5 ntau lub zog ntau lub zog, koj tuaj yeem kho qhov hluav taws xob ntawm txoj kab zoo thiab tsis zoo ntawm nws tus kheej. Daim duab 7 qhia qhov piv txwv, qhov twg kuv tau kho qhov tso tawm ntawm +/- 9V.

Kauj Ruam 7: Daim duab 7, +/- 9V Rails ntawm Qhov Tawm

Tam sim no nws yog lub sijhawm los ntsuas lub suab nrov. Kuv siv Siglent SDS1104X-E oscilloscope uas qhia txog 500uV/div rhiab heev ntawm cov tswv yim uas ua rau nws zoo tagnrho rau kev ntsuas. Kuv tso cov channel-ib ntawm 1X, AC txuas, 20MHz bandwidth txwv, tom qab teeb tsa hom kev yuav khoom ntawm lub ncov-ntes.

Tom qab ntawd kuv tshem tawm cov hmoov txhuas hauv av thiab siv lub tshuab sojntsuam hauv av. Nco ntsoov tias qhov ntsuas no tsis muaj qhov tso tawm. Daim duab 8 qhia pom lub vijtsam oscilloscope thiab qhov ntsuas ntsuas. Vpp daim duab ntawm lub suab nrov nyob ib puag ncig 1.12mV. Thov nco ntsoov tias kev nce qhov tso tawm tam sim no yuav ua rau lub suab nrov/ripple qib. Nov yog zaj dab neeg tseeb rau txhua qhov khoom siv fais fab.

Kauj Ruam 8: Daim duab 8, Lub Suab nrov nrov ntawm Lub Hwj Huam (nyob hauv Tsis Muaj Kev Thauj Khoom)

Lub zog hluav taws xob ntawm R1 thiab R2 resistors piav qhia cov zis tam sim no. Yog li kuv xaiv 3W resistors. Tsis tas li, yog tias koj npaj siab kos qhov siab tam sim no lossis qhov sib txawv ntawm qhov sib txawv ntawm cov tswv yim thiab cov zis ntawm tus tswj hwm siab, tsis txhob hnov qab teeb tsa lub rhaub dej haum tsim nyog ntawm IC1 thiab IC2. Koj tuaj yeem cia siab tias yuav tau txais 500mA (max) los ntawm kev siv 3W resistors. Yog tias koj siv 2W resistors, tus nqi no ib txwm txo qis mus rau 300mA (qhov siab tshaj).

[4] Cov ntaub ntawv

Daim duab 9 qhia txog daim nqi ntawm cov khoom siv.

Kauj Ruam 9: Daim duab 9, Cov Nqi Khoom

Kauj ruam 10: Cov neeg ua tim khawv

Tau qhov twg los:

[1] LM317 Cov Ntawv Teev Npe:

[2] LM337 Cov Ntawv Teev Npe:

[3]: Schematic Symbol thiab PCB hneev taw rau LM317:

[4]: Schematic Symbol thiab PCB hneev taw rau LM337:

[5]: Altium Plugin: