kohacraft's blog

Created a High-Loudness ECM Microphone Amplifier that Operates on Phantom Power

Imadeamicrophoneamplifierthatcanrunonphantompowerandcanhandlehighvolume.CircuitCircuitdiagramThisisamicrophoneamplifierc...

2021.05.22

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Electronics

Got the PCB I ordered from PCBWay in just six days! and assembled the IV-6VFD clock!

IorderedPCBsfortheIV-6VFDclockfromPCBWaylastweek,andtheyarrivedinjust6days.HerearethedetailsaboutthePCBIordered.Fromorde...

2021.05.21

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Electronics

Using PCF2129, a real-time clock IC, with ESP32

PCF2129Operatesat3.3VThePCF2129isareal-timeclockICthatcanrunat3.3V,andisconnectedtothemicrocontrollerviaI2CorSPI.DS3231i...

2021.05.15

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Electronics

All the numbers were displayed by dynamically lighting them with the beautiful and transparent VFD display tube IV-27M

Inthepreviousarticle,Idisplayedonlyonedigit,butthistimeIwouldliketodynamicallylightupanddisplayalldigits.Hereistheprevio...

2021.05.12

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Electronics

Displaying a single digit number with the beautiful and transparent VFD display tube IV-27M

ThistimeIwouldliketocontroltheIV-27MwithESP32anddisplaythenumbers.HereisthepreviousexperimentalarticlewhereItriedthisout...

2021.05.12

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Electronics

Shining the beautiful and transparent VFD display tube IV-27M

IlituptheIV-27M,whichIbarteredwitharetrodisplaytubeenthusiastinUkraine.FormoreinformationabouttheVDFIbarteredwith,please...

2021.05.12

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Electronics

The 3rd Try My Luck at Buying Unlabeled Junk Famicom Cassettes at a Recycle Shop

ThisisasectionwhereIbuyunlabeledcassettesfromthejunkFamicomcassettesectionofHardOffandtrytoplaythem.Thistime,Ifoundapurp...

2021.05.11

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Famicom

Designed a clock PCB for VFD display tube IV-6 and MM5316N and ordered it from PCBWay

NowthatIhavecompletedtheclockusingIV-6andMM5316N,IwouldliketoconvertittoPCBandorderitfromPCBWay.Hereisthepreviousarticle...

2021.05.11

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Electronics

VFD display tube IV-6 and MM5316N clock in alarm clock style

TheVFDclockImadetheotherdaywasbuiltintoanalarmclocktomakeitlooklikeanalarmclock.Thepreviousarticleishere.SolderingRemove...

2021.05.11

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Electronics

I made neon tubes glow with an inverter transformer and blocking oscillation

Theblockingoscillationcircuitisasimplehigh-voltagegeneratorcircuitthatcanbemadeusingonlyatransformer,transistor,andresis...

2021.05.11

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Electronics

VFD display tube IV-6 and MM5316N with clock source added to become a clock

Inthisarticle,IwouldliketoaddaclocksourcetothepreviouscircuittomakeitaVFDclock.Thepreviousarticleishere.50HzclockThecloc...

2021.05.11

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Electronics

I made a ring oscillator using transistors

Imadearingoscillatorcircuitwithtransistors,wheretheLEDslightupinsequence.RingoscillatorIfyouconnectanoddnumberofNOTgates...

2021.05.11

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Electronics

Making a clock using VFD display tube IV-6 and MM5316N

I'mgoingtomakeawatchoutofanIV-6thatIbarteredwitharetrodisplaytubeenthusiastinUkraine.PuttingtheVFDontheboardTheIV-6sIbar...

2021.05.04

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Electronics

Made a compact DCDC converter that generates high voltage for Nixie tubes from 5V

WehavecompletedaDCDCconverterthatgeneratesthehighvoltagerequiredforNixietubesfrom5V.Here'salookattheprocessofmakingit.Th...

2021.05.02

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Electronics

Blinking Neon Tube with Arduino

Hi,I'mkohanii.OurshopmakeshighvoltageDCDCconvertersforNixietubes.Youcanfinditat↓ThisDCDCconvertercanboosta5Vpowersupplyt...

2021.05.02

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Electronics

How to convert an Nintendo Famicom to video output super easily with FCAV

Here'showtouseFCAVtoconvertyourNintendoFamicom(NESJapanVersion)tovideooutputinasupereasyway.TheFCAVhasthemeritofreducing...

2021.05.01

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ElectronicsFamicomInstruction Manual

Lithium-ion battery-powered compact flashlight I made

Bycombiningalithium-ionrechargeablebatterywithaninexpensivecharge/dischargeboard,acompactflashlightwascreated.Configurat...

2021.05.01

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3D PrinterElectronics

I turned on the VFD indicator tube IV-6

IlitupaVFDindicatortubeIV-6thatIbarteredwitharetroindicatortubeenthusiastinUkraine.Herearethedetailsofthebarter.Specific...

2021.05.01

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Electronics

ESP32 reduced current consumption during DeepSleep by putting HX711 into power down mode.

IconfiguredascalewithHX711andmadeamailboxthatnotifiesmewhenthereismail.ByreplacingtheregulatorwithaDCDCconverterandtheUS...

2021.04.28

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Electronics

A retro display tube enthusiast from Ukraine and I exchanged my Nixie tube clock kit for his display tube!

IwascontactedbyaretrodisplaytubeenthusiastfromUkraine.HesaidhewasveryinterestedinalarmclockstyleNixietubeclocks.Hewanted...

2021.04.28

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Electronics

Modification of DPS605U, a Chinese regulated power supply with constant current function, almost eliminated the ripple.

WhenIexperimentedbyconnectingalargeloadtotheDPS605U,therewasquiteabitofripplenoiseonit.Pleaseseehereforthereviewandloade...

2021.04.28

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Electronics

Trying a different step-up circuit to see if a small high current transformer can be used as a power supply for Nixie tubes.

LasttimeItriedconnectingittotheNixieDCDCvoltageboostcircuit,butitdidn'tboostthevoltageproperly,soItriedadifferentcircuit...

2021.04.27 2021.04.28

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Electronics

I got a small high-current transformer, so I experimented to see if I could use it to power a Nixie tube.

IfoundatransformerthatcancarrythreetimesmorecurrentthantheoneusedintheNixieDCDC,soIexperimentedtoseeifIcouldincreasetheo...

2021.04.27

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Electronics

The LCD panel of the iPhone broke, so I replace it by myself.

TheLCDpanelofIphonecanberepairedatacostofabout20US$ifyoureplaceitbyyourself.SoItriedtoreplaceitbymyself.BuyinganLCDpanel...

2021.04.27

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ElectronicsiPhone

ESP32-DevKitC's DeepSleep is consuming quite a bit of current, so I investigated the cause.

TheESP32-DevKitCisaboardthatmakesiteasytousetheESP32.IoftenusenottheEspressifSystemsgenuineESP32-DevKitC,butitscompatibl...

2021.04.27 2021.04.28

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Electronics

A convenient item that makes the tip of a soldering iron that has become black and no longer soldered shiny

Ifyouuseitforalongtimeorleaveitpluggedinforalongtime,thetipofthesolderingironwillturnblackandthesolderwillnotstickatall....

2021.04.25

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Electronics

Added thermometer to NTP calendar & clock of Canon Canola L1211 display

IaddedathermometertoanindicatorthatwasmanufacturedduringtheshortperiodbeforethetransitionfromNixietubestoVFDs.SEPTANIXJ4...

2021.04.25

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Electronics

Revenge of buck-boost DCDC converter circuit to operate ESP32 with two batteries

Inthepreviouscircuit,whentheESP32triedtoconnecttoWiFi,thevoltagedroppedandtheESP32rebooted.Thistime,I'llchangetoaDCDCcon...

2021.04.25

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Electronics

Make a circuit using CH340C for ESP32 writing (success).

ThecircuitImadetheotherdaycouldnotrecognizeCH340Konmycomputer,soIusedCH340Ctomakethecircuit.Hereisarecentarticleonfailed...

2021.04.18

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Electronics

Make a circuit using CH340K for ESP32 writing (failed).

InordertowritetheESP32fromtheArduinoIDE,aUSBserialconversionICisrequired.ThistimeIwouldliketomakeacircuitusingCH340KasaU...

2021.04.17

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Electronics

The NTP calendar & clock was completed by controlling the display of Canon Canola L1211 with ESP32.

MakingtheclockwithaCanonCanolaL1211displayunitIwouldliketomaketheclock,sincetheworkIhavedoneuntiltheotherdayhasallowedme...

2021.04.14

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Electronics

The display of Canon Canola L1211 was dynamically lit with ESP32, and 11-digit numbers could be displayed.

EachsegmentofthedisplayunitofCanonCanolaL1211canbeturnedonandoffbyESP32Lasttime,Iwasabletoturnthesegmentonandoff,andIama...

2021.04.14

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Uncategorized

Canon Canola L1211's display unit controlled by ESP32 to display a single digit number.

EachsegmentofthedisplayunitofCanonCanolaL1211canbeturnedonandoffbyESP32.FormoreinformationaboutJRC(JapanRadioCo.,Ltd.)SE...

2021.04.14

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Electronics

Light up the indicator on an old calculator from the 1970s, Canon Canola L1211.

CanolaL1211TheCanolaL1211wasadesktopcalculatorsoldbyCanoninthe1970s.Itisconnectedtoanelectricaloutletandhasanorangeindic...

2021.04.14

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Electronics

I bought DPS605U, a Chinese regulated power supply, with constant current function and modified it a little.

TheDPS605Uisaregulatedpowersupplywithaconstantcurrentfunctionthatcanoutputupto60V5A.Thefour-digitdisplayofvoltageandcurr...

2021.04.14

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Electronics

The mailbox with a built-in "scale" that notifies me by e-mail when a mail arrives has been completed!

Ihavecompletedamailboxthatdetectsthearrivalofmailbyweightandnotifiesmebye-mail.WeighingwithHX711UsingastraingageandtheHX...

2021.04.14

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Electronics

A very easy way to accurately align the stencil with the PCB

ThisarticleisacontributiontoPCBWayPCBDesignTutorial.SMDStencilBeforesurfacemountcomponentscanbemountedonaboard,itisneces...

2021.04.13

kohapepe

Electronics

Make a power supply circuit (step-up/step-down DCDC converter) to run ESP32 on about two batteries.

ESP32isamicrocontrollerthatoperatesatabout3Vto3.3V.I'mgoingtomakeaDCDCconvertercircuittorunonabouttwobatteries.Toseewhat...

2021.04.07

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Electronics

Make a stand to stand the Nintendo switch with a 3D printer

OnthebackoftheNintendoSwitch,thereisasmallstandthatallowsyoutostandtheswitchupandplaywithit.However,itwouldoftencomeoff,...

2021.04.07

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3D PrinterElectronicsLeaser Cutter

Make a flat light emitting lighting by processing acrylic into a light guide plate with a laser cutter

Iwantedtomakeaplaneluminescentlight.Thisisthesamemechanismusedinthebacklightingoflaptopcomputers,whereapatternisdrawnont...

2021.04.07

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ElectronicsLeaser Cutter

Eliminate The noise mixed in with the HX711 readings

IamcheckingthestabilityofascalemadewithHX711andastraingauge,andabnormalvaluesaremeasuredquiteoften.Iammeasuringtheweight...

2021.04.01

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Electronics

Designed a circuit to automatically switch the power supply from the two power sources (nothing designed to).

I'mdesigningabattery-poweredESP32-DevkitC.TheESP32-DevkitCcanbepoweredintwoways:fromUSBorfromanexternalpowersupply.Forth...

2021.03.31

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Electronics

Designed a power supply circuit to operate the ESP32 with two batteries (actually, I did not design it)

IwantanESP32-DevKitCthatrunsonbatteriesESP32-DevkitCisaboardthatallowsyoutouseESP32easily.ESP32-DevkitCcanbeoperatedbyUS...

2021.03.28

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Electronics

Easy Modification Nintendo Famicom Controller USB Kit is now available!

AlittleoveraweekafterIplacedmyorder,myNintendoFamicomcontrollertoUSBconversionboardarrivedfromPCBWay!Thankyouforeverythi...

2021.03.28

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ElectronicsFamicom

Sending measurement data to Ambient to check the stability of strain gauge "scales".

Iwouldliketoleavethe"scale"Imadetheotherdayoutdoorsforafewdaystocheckthefluctuationsinthereadings.Therefore,Iimprovedthe...

2021.03.27

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Electronics

See if I could measure the correct weight with a "scale" made from a strain gauge.

Ididanexperimenttoseeifthe"scale"andtheprogramImadetheotherdaycouldmeasureweightcorrectly.Here'sthe"scale"Imadetheotherd...

2021.03.27

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Electronics

Make the PCB that can be used with Nintendo Famicom controllers for a PC from PCBWay.

IwanttoplaygameswithanNintendoFamicomcontrollerWhenplayingonaPCwithanemulatorsuchasNES,youwillbeplayingwithagamepadthati...

2021.03.27

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ElectronicsFamicom

Making a mailbox with a built-in "scale" to let you know when the mail arrives.

Ifyourmailboxisoutdoors,youwillnotknowifyourmailhasbeendelivered.Often,wedon'tevennoticeforawhilethatthemailwe'vebeenwai...

2021.03.21

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ElectronicsInstruction ManualLeaser Cutter

Modify the circuit of the HX711 module to operate at 3.3V and measure the weight with ESP32

HX711moduleis5VspecificationTheHX711modulesoldonAmazonisdesignedtoworkwitha5Vpowersupply.SincetheESP32hasasupplyvoltageo...

2021.03.21

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Electronics

GPS Nixie tube clock that looks like an alarm clock

IassembledtwoNixietubeclockswithGPSintheformofalarmclocks.Inthisarticle,weareassemblingtheproducthere👇👇.SolderingSoldert...

2021.03.17 2021.04.18

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Electronics

How to use the GPS-equipped e-paper clock.

ApplypowerPrepareaUSBchargerathomeoraUSBchargersoldata100yenstore.PlugtheUSBconnectorintotheUSBcharger.Dothisnearawindow...

2021.03.10 2021.03.17

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Electronics

How to set the time zone of the GPS-equipped e-paper clock

LearnhowtosetthetimezoneforyourGPS-equippede-paperclock.Youwillneedasmartphonetosetthisup.Thee-paperwatchwithGPSisnowava...

2021.03.10 2021.03.17

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Electronics

GPS e-paper control PCB is placed in a photo frame and GPS e-paper clock is completed.

Inthisproject,IwouldliketointegratetheGPSe-papercontrolPCBintoaphotoframeandmakeitintoaGPSe-paperclock.Here'sa👇👇descript...

2021.03.10 2021.03.17

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Electronics

Made the e-paper control PCB with GPS function.

Imadeacontrolboardforane-paperthathasaGPSmoduleandcankeepaccuratetimeatanytime.PrintingsolderpasteIhadthePCBandstencilma...

2021.03.10 2021.03.17

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Electronics

JLCPCB charges for the same design panelizing

Inthepast,JLCPCBdidnothavetopayextraforimpositionoftwoexactlythesamecircuitsona10x10cmboard,butwhenIorderedthistime,Ihad...

2021.02.15

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Electronics

Stamp with the CO2 laser cutter EtcherLaserPro.

Whenyouusealasercuttertomakeastamp,youusuallyusesiliconerubber.ThistimeIwouldliketomakeastampbycuttingMDFwithalasercutte...

2021.02.06

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Leaser Cutter

Make a wooden key chain by engraving and cutting with CO2 laser cutter

ImadeakeychainfromMDFandveneer,engraved&cutwithEtcherLaserPro.PreparingtheprocessingdataFirst,convertmydogEva'sphototobl...

2021.01.10

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ElectronicsLeaser Cutter

Record the sound source of the actual Nintendo Famicom in stereo [MOTHER]

MOTHERspoileralert?Hi,I'mkohanii.ThissitesellsakittoturnyourNintendoFamicomintoapseudo-stereosystem.Thispseudo-stereotak...

2021.01.10

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Famicom

How to fix a Bose QuietComfort QC25 that has lost sound on one side for about $30.

DoBoseNCheadphoneshaveatendencytobreakthespeakerononeside?TwoofthembrokeIhavetwoQC25s,andoneofthespeakersstoppedworkinga...

2021.01.02

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ElectronicsInstruction Manual

I made a dynamic microphone with the speaker unit of headphones! & I also tried it with ordinary speakers!

Hi,I'mkohanii.Inthefollowingblog,IhadrepairedthespeakersoftheBoseQuietComfortQC25headphones.WhenIrepairmyheadphones,Ibuy...

2021.01.02

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Electronics

How to distribute video to Windows 10, Mac, Android in LAN with OBS Studio

Hi,I'mkohanii.IntroducinghowtodistributevideofromawebcamorotherdevicetoanotherPC,Android,etc.SettinguptheOBSStudioMyOSis...

2021.01.02

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ElectronicsInstruction Manual

Make the large 8x8 LED dot matrix even brighter

Hi,Konaniihere.It'sHalloweentoday.ImadeaLarge8×8LEDDotMatrixbefore.TheresistorattachedtolimitthecurrentoftheLEDis100Ω.Wh...

2021.01.01

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Electronics