Ultra Low Wattage, High Gain Tube Amplifier: 13 Cov Kauj Ruam (nrog Duab)

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

Rau chav pw rockers zoo li kuv, tsis muaj dab tsi phem dua li kev tsis txaus siab suab nrov. Ntawm qhov tod tes, nws yog kev txaj muag kom muaj 50W lub tshuab hluav taws xob txuas rau lub nra tawm yuav luag txhua yam hauv tshav kub. Yog li ntawd kuv tau sim tsim kom muaj kev nce qib ua ntej, raws li lub npe nrov mesa lub tshuab hluav taws xob siv qee lub raj me me rau qhov tso zis qis tshaj.

Kauj Ruam 1: Txheej txheem cej luam, Cov Cuab Yeej thiab Cov Khoom

Cov ntawv qhia no yuav yog cov qauv raws li:

1. Lub ntsiab lus ntawm Circuit Court: Tus amplifier
2. Txheej txheem cej luam ntawm Circuit: SMPS
3. Daim ntawv teev npe
4. Hloov cov cua sov
5. Daim npog qhov ncauj
6. Etching
7. Ua tiav
8. Ntxiv qhov nyob
9. Sib dhos cov laug cam
10. Kho cov trimpots
11. Txhim kho txhua yam hauv qhov thaiv
12. Qhov kawg thiab Soundcheck

Muaj qee cov cuab yeej xav tau los tsim lub tshuab hluav taws xob no:

• Laum tes, nrog cov khoom siv sib txawv (yog tias koj xav laum PCB nrog kev siv tes koj xav tau 0.8-1 hli laum ntsis, tsis nquag pom hauv cov khoom siv).
• Soldering hlau
• Khaub ncaws hlau
• Multimeter
• Sanding cov ntaub ntawv
• Nkag mus rau lub tshuab luam ntawv toner
• Lub thawv yas rau kos

Thiab qee cov ntaub ntawv

• Sanding ntawv (200, 400, 600, 1200)
• Tsuag xim (dub, meej)
• PCB Txheej tsuag
• Ferric Chloride Etching Tshuaj
• Solder

Kauj Ruam 2: Circuit Overview: Amplifier

Subminiature leeg rau roj teeb

Txog qhov haujlwm no kuv siv 5678 thiab 5672 raj. Lawv tau siv hauv xov tooj cua lub roj teeb nqa tau, qhov twg tam sim no cov ntsiab lus muaj teeb meem. Cov raj no tsuas xav tau 50mA rau lawv cov filaments, ua rau lawv muaj txiaj ntsig ntau dua li 12AX7. Qhov no ua rau kev siv tam sim no qis, xav tau lub zog me me. Hauv qhov no kuv xav kom lawv nrog 9v 1A fais fab mov, raws li siv feem ntau nrog cov ntiv tes taw.

Lub 5678 raj muaj mu ntawm kwv yees li 23, uas ua rau nws qis qis hauv kev sib piv nrog 12AX7, tab sis tej zaum nrog qee qhov kev hloov pauv txawm tias qhov no tuaj yeem txaus. Kev nce qib siab tau paub tias muaj kev lim ntau ntawm cov theem, qhov twg yuav luag feem ntau ntawm cov teeb liab tau luv rau hauv av. Tej zaum yuav muaj cua los ua si nrog.

Qhov 5672, ntawm qhov tod tes, muaj lub suab ntawm 10, tab sis feem ntau siv los ua lub raj fais fab hauv cov khoom siv pab hnov lus, thiab twb tau siv hauv qee qhov lwm lub tshuab ua suab nrov me me (Tua ib qho thiab Vibratone, los ntawm Zaus Hauv Zej Zog). Nws tuaj yeem tsim tawm txog 65mW huv si … ish. Tsis txhob ntshai nrog lub zog qis, nws tseem nrov nrov thaum cuam tshuam! Cov ntawv qhia meej 20k tso zis hloov pauv rau lub raj no.

Raws li tau tsim yav dhau los, yuav siv lub 22921 reverb transformer.

Kev ntxub ntxaug

Ib qho ntawm cov teeb meem yog kev tsis ncaj cov hlab no yam tsis siv roj teeb sib txawv, vim tias lawv tau ncaj qha ua kom sov cathodes. Kuv tsis xav ua qhov nyuaj dua, yog li kuv yuav tsum siv kev teeb tsa tsis ncaj ncees. Qhov no, ntawm qhov tod tes, tso cai siv cov filaments hauv koob, txo kev siv tag nrho cov filament. Nrog 6 lub raj, txhua qhov poob qis 1.25V, Kuv tau zoo nkauj ze rau 9V ntawm lub zog xa khoom, nws tsuas yog xav tau me me tiv thaiv, uas tseem txhim kho kev tsis ncaj ncees ntawm thawj theem. Qhov no txhais tau tias tag nrho cov ntsiab lus tam sim no tsuas yog 50mA!

Zoo nkauj heev rau lub zog pedal.

Txhawm rau nws ua haujlwm, qee cov theem muaj trimpot los kho qhov xav tau tsis ncaj ncees. Kev tsis ncaj ncees raug xam raws li qhov sib txawv ntawm qhov hluav taws xob ntawm qhov tsis zoo ntawm cov ntsiab lus (f-) thiab kab sib chaws ntawm lub raj. Lub trimpot hloov kho DC qhov hluav taws xob ntawm kab sib chaws ntawm lub raj, tso cai rau kev teeb tsa kev sib txawv sib txawv thiab hla dhau los ntawm lub peev xwm loj, ua haujlwm luv rau hauv av rau lub teeb liab.

Theem thib peb, piv txwv li, muaj kev ntxub ntxaug ze rau qhov txiav tawm ntawm lub raj ntawm -1.8V, ua tiav raws li qhov sib txawv ntawm f- (tus pin 3) ntawm kwv yees li 3.75V thiab kab sib chaws, ntawm 1.95V. Cov theem no ua raws cov theem txias txias pom nyob rau hauv cov khoom siv tau nce siab, xws li lub soldano lossis ob lub rectifier. 12AX7 nyob rau hauv ob lub rectifier siv 39k resistor kom ua tiav qhov no. Lwm theem yuav luag nruab nrab qhov tsis txaus ntseeg, kwv yees li 1.25V.

Kauj Ruam 3: Circuit Overview: SMPS

Cov khoom siv hluav taws xob siab

Hais txog lub phaj hluav taws xob, cov raj no ua haujlwm zoo nrog cov phaj hluav taws xob ntawm 67.5V, tab sis kuj tseem ua haujlwm nrog 90V lossis 45V roj teeb. Cov roj teeb ntawd loj heev! Lawv kuj nyuaj tuaj thiab kim. Tias yog vim li cas kuv xaiv rau qhov hloov pauv lub zog fais fab (SMPS) hloov chaw. Nrog SMPS Kuv tuaj yeem txhawb 9V txog 70V thiab ntxiv qee qhov kev lim dej loj ua ntej tso zis hloov pauv.

Kev siv hluav taws xob hauv cov lus qhia no yog ua raws 555 nti, ua tiav siv hauv kev tsim yav dhau los.

Kauj Ruam 4: Daim Ntawv Teev Npe

Ntawm no koj muaj cov ntsiab lus ntawm cov ntu tsim nyog:

Mainboard

C1 22nF / 100V _ R1 1M_V1 5678C2 2.2nF / 50V _ R2 33k_V2 5678C3 10uF / 100V _ R3 220k_V3 5678 C4 47nF / 100V _ R4 2.2M _ V4 5678 C5 22pF / 50V _ R5 520k_V5 5678C6 1nF / 100V _ R6 470k_V6 5672C7 10uF / 100V _ R7 22k_TREBBLE 250K Tawm 9 mmC8 22nF / 100V _ R8 100k_MID 50k Tawm 9 hli C9 10uF / 100V _ R9 220k_BASS 250K Tawm 9 mmC10 100nF / 100V _ R10 470k_GAIN 250K nkag mus / suab 9 mmC11 22nF / 100V _ R11 80k_ muaj 100k Tawm 9 hli C12 470pF / 50V _ R12 100k_VOLUME 1M nkag mus / suab 9 mmC13 10nF / 50V _ R13 15k_B1 10 k trimpotC14 22nF / 50V _ R14 330k_B2 50k trimpotC15 680pF/50V _ R15 220k_B4 50k trimpotC16 2.2nF/50V _ R16 100k_SW1 micro DPDTC17 30pF/50V _ R17 80k_J1 6.35 mm Mono nkausC18 220u F / 16V _ R18 50k_J2 DC JackC19 220uF / 16V _ R19 470k_J3 6.35 hli Mono-hloov jackC20 220uF / 16V _ R20 50k_SW2 SPDTC21 220uF / 16V _ R21 100k_LED 3 mmC22 100uF / 16V _ R22 22k_3 hli LED holderC23 100uF / 16V _ R23 15R / 25R C24 220uF / 16V _ R24 15k C25 10uF / 100V _ R25 100R C26 10uF/100V _ R26 1.8k C27 220uF/16V _ R27 1k C28 100uF/16V _ R28 10k C29 47nF/100V _ R29 2.7k (LED resistor, kho kom ci) C30 22nF/100V _ R30 1.5k

Tshwj xeeb mloog mus rau qhov ntsuas qhov ntsuas hluav taws xob. Cov hluav taws xob hluav taws xob siab yuav tsum tau 100V cov khoom siv hluav taws xob, txoj kev teeb liab tom qab kev sib txuas hluav taws xob tuaj yeem siv qhov txiaj ntsig qis dua, hauv qhov no kuv siv 50V lossis 100V txij li zaj duab xis capacitors muaj tib tus lej sib nrug. Cov filaments yuav tsum tau txiav tawm, tab sis vim tias qhov hluav taws xob siab tshaj plaws ntawm cov filaments yog 9V ib 16V eletrolytic capacitor yog nyob rau sab nyab xeeb thiab txoj kev me dua li 100V ib qho. Resistors tuaj yeem yog hom 1/4W.

555 SWB

C1 330uF/16V _ R1 56k_IC1 LM555NC2 2.2nF/50V _ R2 10k_L1 100uH/3A C3 100pF/50V _ R3 1k _Q1 IRF644 C4 4.7uF/250V _ R4 470R_R1 4R2R2F1R4F1R2F4R1V2R2F1R4R2F1R1V2F4R2R1F1R2F4R1F1R2K4R4R2R1V2R2R1

Ua tib zoo saib rau kev hloov diode! Nws yuav tsum yog hom ultra nrawm, txwv tsis pub nws yuav tsis ua haujlwm. Rau SMPS qis ESR capacitors kuj xav tau. Nyob rau hauv rooj plaub ib txwm 4.7uF/250V lub tshuab hluav taws xob tau siv cov khoom siv hluav taws xob ntxiv ntawm 100nF ua ke pab txhawm rau hla kev hloov pauv ntau zaus.

Cov no yog cov ntu uas yooj yim dua los nrhiav thiab tuaj yeem tau txais los ntawm ib qho khoom siv eletronic. Tam sim no, qhov tsis yooj yim yog:

OT 3.5W, 22k: 8ohm transformer (022921 lossis 125A25B) Banzai, Tubesandmore

L1 100uH/3A inductor Ebay, tsuas yog tsis txhob yuav lub toroidal zoo li tus. Koj tseem pom nws ntawm Mouser/Digikey/Farnell.

Tsis txhob hnov qab yuav:

• Cov tooj liab clad board, 10x10 mm yuav ua rau ob qho tib si
• 2 x 40 tus pin ntsaws qhov rau cov raj
• A1590B cov ntaub ntawv
• Qee qhov 3 hli ntsia hlau thiab txiv ntseej
• Roj hmab taw
• 5 hli roj hmab hlau grommets
• Rau qhov 10 hli pob qhov rooj

Kauj Ruam 5: Hloov Thermal

Txhawm rau npaj PCB thiab lub thawv ntawv kuv siv cov txheej txheem raws li hloov pauv toner. Cov tshuaj toner tiv thaiv cov nplaim los ntawm cov kws tshawb fawb, thiab vim li ntawd tom qab da dej da dej peb muaj PCB nrog cov tooj liab los yog cov ntaub thaiv zoo nkauj. Cov txheej txheem ntawm kev xa cov toner thiab npaj rau kev kos muaj xws li:

• Luam qhov txheej txheem/duab nrog lub tshuab luam ntawv toner siv cov ntawv ci.
• Xuab zeb nto ntawm lub thawv ntawv thiab ntawm lub rooj tsav tooj liab siv cov ntawv xuab zeb nrog cov pob zeb 200 txog 400.
• Txhim kho cov duab luam tawm rau PCB/lub thawv ntawv siv daim kab xev.
• Ua kom sov thiab siab nrog cov khaub ncaws hlau li 10 feeb. Ua qee qhov txav mus ntxiv nrog qhov ntxeev ntawm cov hlau ntawm cov ntug, cov ntawd yog qhov chaw tsis zoo qhov twg lub toner yuav tsis lo.
• Thaum daim ntawv tab tom nrhiav xim daj nws hauv lub thawv yas ntim nrog dej kom txias nws, thiab cia cov dej tsau rau hauv daim ntawv.
• Tshem daim ntawv ua tib zoo. Nws zoo dua thaum nws tawm los hauv txheej, tsis txhob tshem txhua yam hauv ib zaug.

Tus qauv laum pab txheeb xyuas qhov chaw ntawm cov khoom, koj tsuas yog xav ntxiv koj tus kheej daim duab, thiab koj zoo mus.

Kauj Ruam 6: Daim npog qhov ncauj

Rau qhov thaiv, npog qhov chaw loj dua nrog ntsia thawv ntsia hlau. Txij li cov tshuaj tiv thaiv nrog txhuas muaj zog dua li tooj liab, tuaj yeem muaj qee qhov pitting hauv thaj chaw loj dua.

Muab kev tiv thaiv ntxiv lav tias yuav tsis muaj cov cim los rhuav lub thawv ntawv.

Kauj ruam 7: Etching

Txog cov txheej txheem kos kuv nyiam siv lub khob yas ntim nrog cov etchant thiab ib qho nrog dej los yaug ntawm cov theem.

Ua ntej, qee qhov lus qhia txog kev nyab xeeb:

• siv hnab looj tes roj hmab los tiv thaiv koj txhais tes
• ua haujlwm ntawm qhov tsis yog xim hlau
• Siv chav uas muaj cua nkag tau zoo thiab zam kev nqus cov pa
• Siv qee daim ntawv los tiv thaiv koj lub chaw ua haujlwm los ntawm kev nchuav tau

Ntawm no kuv tsuas yog qhia cov cim ntawm lub thawv ntawv, tab sis PCB tau kos rau hauv tib qho kev daws teeb meem. Qhov sib txawv tsuas yog tias rau PCB Kuv tsuas yog tos txog ib teev txog thaum tag nrho cov tooj liab uas tsis muaj kev tiv thaiv tau ploj mus. Nrog cov txhuas yuav tsum muaj qee qhov kev saib xyuas ntxiv, txij li peb tsuas yog xav txhawm rau sab nraum lub thawv.

Txog qhov thaiv kuv tuav lub thawv hauv qhov sib tov sib xyaw rau li 30 vib nas this, kom txog thaum nws sov vim qhov tshuaj tiv thaiv yaug nws hauv dej. Kuv rov ua cov kauj ruam no ntxiv 20 zaug, lossis kom txog thaum lub qhov tob tob txog 0.5 hli tob.

Thaum cov ntawv nplaum tob txaus ntxuav lub thawv nrog dej thiab xab npum kom yaug tawm tag nrho cov tshuaj ntxiv. Nrog lub thawv ntxuav cov xuab zeb thiab cov ntsia thawv txhuam tawm. Rau cov ntsia thawv ntsia hlau koj tuaj yeem txuag qee cov ntawv xuab zeb los ntawm kev siv acetone, tab sis nco ntsoov ua kom chav nyob muaj cua nkag tau zoo!

Kauj ruam 8: Ua tiav

Hauv cov kauj ruam no kuv tau siv 400 daim ntawv xuab zeb los ua kom tiav qhov huv, zoo li hauv daim duab thib peb. Qhov no huv txaus rau cov kauj ruam drilling. Kuv drilled txhua qhov sib txawv me me qhov, thiab siv cov ntaub ntawv los ua lub qhov rau cov hlab ntsaws. PCB yuav tsum tau dhau ib qho dhau lawm, Kuv 0.8 hli laum me ntsis rau cov khoom siv thiab 1-1.4 hli rau cov xaim qhov. Hauv qhov kev tsim no kuv kuj tau siv 1.3 hli laum rau lub raj ntsaws.

Nrog rau qhov drilling thiab ua tiav kuv muab lub thawv rau lub tsho dub ntawm cov xim tsuag thiab cia nws qhuav rau 24 teev. Nws yuav muab qhov sib piv zoo dua ntawm cov ntawv thiab lub thaiv. Pom tseeb, cov kauj ruam tom ntej yog xuab zeb nws tawm. Lub sijhawm no kuv mus ntawm 400 mus rau qhov zoo tshaj plaws. Kuv hloov daim ntawv sandng thaum ib qho zom tawm cov kab ntawm ib qho dhau los. Sanding hauv kev sib txawv dirrections ua rau nws yooj yim los txheeb xyuas thaum tag nrho cov cim dhau los ploj mus. Nrog lub thaiv ci ntsa iab Kuv thov 3 txheej ntawm lub tsho ntshiab thiab tos kom txog thaum nws qhuav rau lwm 24h. PCB tuaj yeem tiv thaiv los ntawm kev xeb los ntawm kev siv txheej tiv thaiv. Raws li koj tuaj yeem pom hauv ob daim duab kawg kuv nyiam kom muaj xim ntsuab tsaus. Cov txheej no xav tau sijhawm ntev dua kom qhuav. Kuv tau tos 5 hnub kom tsis txhob muaj cov ntiv tes luam tawm ntawm lub rooj tsav khoom thaum siv cov khoom sib xyaw.

Kauj Ruam 9: Ntxiv Qhov Ntsuas

Soldering Qhov (Socket)

Raws li qhov teeb tsa, cov raj tau muab tso rau ntawm sab tooj liab ntawm lub rooj tsavxwm. Txoj hauv kev no pawg thawj coj tuaj yeem txav los ze zog rau cov ntaub ntawv thiab tau txais txiaj ntsig los ntawm qee qhov kev tiv thaiv ntxiv tiv thaiv kev ua phem phem EMI los ntawm SMPS. Tab sis kev siv tooj liab sab ntawm lub rooj tsav khoom kom sib xyaw cov khoom muaj qee qhov tsis zoo, xws li tooj liab dhau los ntawm lub rooj tsavxwm. Txhawm rau zam qhov no, tsis txhob siv lub qhov tso rau hauv lub raj, Kuv tau ua qhov loj dua qhov twg lub qhov rooj tuaj yeem nias tau. Txog qhov no kuv tau siv lub tshuab ua haujlwm zoo li tus pin, tsis muaj cov qauv yas, yuam cov hlau hlau hauv lub qhov thiab muab tshuaj txhuam rau ntawm ob sab (ntawm cov khoom sab nws zoo li blob ntawm cov laug, tab sis nws pab ua kom tus pin nyam), raws li qhia hauv thawj 3 daim duab. Cov duab 4 thiab 5 qhia tag nrho lub qhov (socket) thiab cov dhia dhia tau teeb tsa.

Soldering lwm txheej ntawm qhov (socket), lub sijhawm no nrog cov qauv yas, rau cov hlab txhim kho kev txuas mus rau lub rooj tsavxwm thiab ua rau nws ruaj khov dua. Thawj tus pin ntawm cov raj yog nyias heev, uas tuaj yeem ua rau qee qhov kev sib cuag tsis zoo lossis txawm tias poob tawm ntawm lub qhov rooj. Los ntawm kev muab lawv txuas rau hauv qhov hluav taws xob peb daws qhov teeb meem no, txij li tam sim no lawv muaj qhov sib haum. Kuv xav tias lawv yuav tsum tau los nrog cov koob kom raug ntawm thawj qhov, zoo li cov raj loj dua!

Kauj Ruam 10: Sib dhos Cov Rooj Sib Tham

Txhawm rau ua kom cov khoom sib txuas Kuv pib nrog cov neeg tawm tsam, thiab txav mus rau qhov loj dua. Cov hluav taws xob hluav taws xob tau muag thaum kawg, vim tias lawv yog cov khoom siv siab tshaj plaws ntawm lub rooj tsavxwm.

Nrog lub rooj tsav xwm npaj nws yog lub sijhawm ntxiv cov xov hlau. Muaj ntau qhov kev sib txuas sab nraud ntawm no, los ntawm lub tonestack mus rau qhov hluav taws xob siab thiab cov xov hluav taws xob. Txog cov teeb liab xov tooj Kuv tau siv kab thaiv kab thaiv, thaiv hauv av hauv qab ntawm lub vaj huam sib luag sab, ze rau qhov nkag.

Cov xov hlau tseem ceeb nyob ib puag ncig thawj theem, los ntawm lub qhov nkag, thiab mus rau qhov nce potentiometer. Ua ntej peb tuaj yeem tsim txhua yam hauv lub thawv peb yuav tsum sim nws, yog li peb tseem tuaj yeem nkag mus rau sab tooj liab ntawm lub rooj tsavxwm rau qee qhov kev debug, yog tias tsim nyog.

Rau qhov ntsuas hluav taws xob siab Kuv tau ntxiv lwm lub lim RC hauv lub rooj tsav xwm me, tau teeb tsa ib qho rau ntawm pawg thawj coj, zoo li pom hauv daim duab. Txoj hauv kev no hauv av, qhov hluav taws xob siab thiab txuas hluav taws xob sib txuas tau yooj yim dua nrog rau pawg thawj coj saib mus rau lub thawv ntawv thiab tuaj yeem muab muag tom qab.

Tsim lub tonestack

Txawm hais tias kuv yuav mus sim lub rooj tsavxwm sab nraum lub thawv ntawv Kuv twb tau tsim lub tonestack hauv lub thawv. Txoj hauv kev no txhua tus potentiometers raug tsau thiab ua kom raug. Kuaj lub voj voog nrog lub zog tsis muaj zog (tsawg kawg yog daim thaiv sab nrauv) tuaj yeem ua rau muaj suab nrov txaus ntshai. Ib zaug ntxiv, rau kev sib txuas ntev dua Kuv tau siv kab thaiv kab thaiv, hauv av ze rau ntawm lub qhov nkag.

Hmoov tsis zoo hauv qhov no tsim cov potentiometers yeej nyob ze ua ke, ua rau nws nyuaj siv lub rooj tsavxwm nrog cov khoom siv. Hauv qhov no kuv tau siv qhov taw tes-rau-taw qhia rau qhov ib feem ntawm Circuit Court. Lwm qhov teeb meem yog tias kuv tsuas muaj PCB style 9 mm 50K potentiometer, yog li kuv yuav tsum tau thauj nws mus rau cov potentiometers nyob sib ze (vaj huam sib luag mount style).

Tam sim no tseem yog lub sijhawm zoo los teeb tsa lub teeb rau/tawm thiab LED nrog 2.7k resistor.

Raws li qhov tshwm sim ntawm ob kab ntawm lub hwj chim kuv tau ua cov phab ntsa sab hauv ntawm lub hau, raws li qhia hauv daim duab, kom lub thawv yuav kaw.

Kauj Ruam 11: Kho Trimpots

Kho 555 SMPS

Yog tias SMPS tsis ua haujlwm tsis muaj qhov hluav taws xob siab thiab lub Circuit Court yuav tsis ua haujlwm raug. Txhawm rau ntsuas SMPS tsuas yog txuas nws mus rau 9V lub zog txuas thiab txheeb xyuas qhov ntsuas hluav taws xob ntawm qhov tso tawm. Nws yuav tsum nyob ib puag ncig 70V, txwv tsis pub nws yuav tsum tau kho nrog lub trimpot. Yog tias qhov hluav taws xob tso tawm yog 9V muaj teeb meem nrog lub rooj tsavxwm. Txheeb xyuas qhov tsis zoo mosfet lossis 555. Yog tias lub trimpot tsis ua haujlwm txheeb xyuas cov lus tawm tswv yim ib puag ncig ntawm lub transistor me dua. Qhov zoo ntawm SMPS no yog suav tsawg ntawm cov khoom, yog li nws yooj yim me ntsis txhawm rau txheeb xyuas qhov ua yuam kev lossis cov khoom tsis raug.

Kho lub mainboard trimpots

Thaum lub sijhawm xeem yog lub sijhawm zoo los kho qhov kev tsis ncaj ncees nrog cov trimpots. Nws tuaj yeem ua tiav tom qab, tab sis yog lub suab nrov mus rau qhov tsaus ntuj lossis kom ci nws yog qhov yooj yim los hloov tam sim no.

Thawj trimpot tswj hwm qhov tsis ncaj ncees ntawm qib thib ob, thib peb thiab theem tso tawm thiab yog li ntawd qhov tseem ceeb tshaj plaws. Kuv hloov kho qhov trimpot no los ntawm kev ntsuas qhov tsis ncaj ncees ntawm theem peb, cov khaub thuas txias. Yog tias kev tsis ncaj ncees siab dhau theem yuav raug txiav tawm tag nrho, muab cov khoom nyoos, txias, ntxig rau. Yog tias nws yog qhov kub dua qhov tso tawm theem yuav kub dhau, ntxiv qee lub zog theem cuam tshuam, thiab khiav lub raj kom ze rau qhov siab tshaj plaws. phaj dissipation Hauv qhov no, sab qis ntawm tus tswv ntim yuav tsum txuas nrog rau qhov tsis zoo ntawm thawj theem, yog li kev tsis ncaj ncees tseem nyob ib puag ncig 5.9V. Hauv kuv qhov xwm txheej nws zoo dua thaum cov theem tso tawm tau khiav ntawm 5.7V hloov ntawm 6.4V.

Tsuas yog ntsuas qhov tsis ncaj ntawm theem peb (nruab nrab lub raj hauv kab tom qab) thiab txheeb xyuas tias nws nyob ib puag ncig 1.95V Qhov thib ob trimpot tsuas yog yuav tsum tau hloov kho kom saj, lossis ze li qhov nruab nrab ntawm 1.2V (ntsuas ntawm pins 3 thiab 4). Ib yam li tus trimpot thib peb kuj tau hloov kho rau kwv yees. 1V.

Kev ntsuas qhov ntsuas ntawm lub raj pins 1 (phaj) rau 5 (filament) yog:

V1:

V2:

V3:

V4:

V5:

V6:

Nco ntsoov tias cov ntaub ntawv hauv 5672 rov qab dua li hauv 5678, yog li cov hlab tsis tuaj yeem pauv tau. Lwm qhov tseem ceeb los xav txog yog lub raj tsim khoom. Kuv pom tias tung-sol tubes ua suab zoo dua hauv thawj txoj haujlwm, dua li cov raj raytheon. Ntsuam xyuas nws nrog oscilloscope nws pom tau tias cov hlab tung-sol tau nce ntau dua li cov raj raytheon uas kuv muaj.

Tam sim no tseem yog lub sijhawm los ntsuas lub Circuit Court thiab saib nws lub suab zoo li cas, yog tias nws hnyav dhau lawm kuv hais kom hloov 47nF lub capacitor nruab nrab ntawm theem ob thiab thib peb mus rau 10nF, uas yuav lim qee cov ntses bass thaj tsam los ntawm thawj theem thiab txhim kho lub suab. Yog tias nws tau nyias dhau, tsuas yog nce lub peev xwm no mus rau 22nF thiab ntxiv rau.

Kauj Ruam 12: Txhim Kho Txhua Yam Hauv Qhov Rooj

Kuv pib ntxiv cov ntsia hlau rau lub hauv paus. Ntawm sab hauv kuv ntxiv cov roj hmab xaim grommets, kom muab qee qhov kev tshem tawm ntawm lub rooj tsavxwm thiab cov thawv thiab tseem ua rau qee qhov kev co. Los ntawm kev ua thawj theem hauv hom pentode qhov no tuaj yeem pab yog tias lub raj tau txais microphonic. Tom qab ntawd kuv tau ntxiv lub rooj tsavxwm thiab ntswj nws nrog cov txiv ntoo, txuas nrog lub tonestack, tso lub qhov nkag thiab txuas cov xov hlau uas seem.

Nrog lub hauv paus tseem ceeb hauv txoj haujlwm kuv tau ntxiv lub tshuab hluav taws xob tso tawm, hloov kho qhov ntev ntawm cov xov hlau thiab tso lub tso zis thiab lub hwj chim tso.

Txij ntawm no kuv pom tias kuv lub SMPS pawg thawj coj saib yuav tsis haum rau txoj haujlwm uas xav tau (ntawm phab ntsa ib sab, nrog cov khoom sib dhos sib dhos rau phab ntsa no) vim tias kuv ntxiv lub hwj chim rau ntawm qhov tsis raug ntawm lub qhov tso tawm … txhawm rau kho qhov no kuv pom SMPS lub rooj tsavxwm ntawm sab nkag, tshem tawm cov inductor thiab lub capacitor, thiab muab cov khoom tso rov qab rau lub rooj tsavxwm tig los ntawm 90 degrees, raws li qhia hauv daim duab. Kuv sim SMPS dua kom pom tias nws tseem ua haujlwm, thiab ua tiav los ntawm kev txuas qhov hluav taws xob siab mus rau lub rooj tsavxwm tseem ceeb, dhau ntawm RC lim lub rooj tsavxwm.

Kauj ruam 13: Soundcheck

Tam sim no tsuas yog ntsaws lub tshuab hluav taws xob rau koj nyiam 8 ohms txee (hauv kuv qhov xwm txheej 1x10 nrog lub hnub qub ntsuab ntsuab) thiab siv koj lub hwj chim pedal los ua si ntawm qib tsis lag ntseg!

Los ntawm txoj kev, yog tias koj nyiam lub suab ntawm koj lub amp tawm tswv yim thaum koj nres ua si thaum kawg ntawm lub suab, tos rau ib nrab ntawm cov vis dis aus, nws tawm tswv yim tau yooj yim thaum zaum ntawm lub tsheb tav xis.

Qhov khoom plig thib ob hauv Pocket Sized Contest