WiMo W2IHY Operating instructions

Brand: WiMo

Model: W2IHY

Category: Microphones

Type: Operating instructions

W2IHY

8BAND

AUDIOEQUALIZER

AND

NOISEGATE

OPERATINGMANUAL

W2IHY 8BAND AUDIO

EQUALIZER AND

NOISEGATE

OPERATINGMANUAL

October2003

JuliusD.Jones

19VanessaLane

Staatsburg,N.Y.(12580)

(845)889-4253

E-mail:Julius@W2IHY.COM

HomePage:http://www.w2ihy.com

c2000W2IHY, ALL RIGHTSRESERVED

-2-

TECHNOLOGIES

W2IHY

MICOUT&POWERCABLEWIRING

-27-

TENTEC

DRAKETR7

DRAKET4XB

COLLINS32S1,32S3

COLLINSKWM2A

COLLINS32V2,32V3

KWS-1

Hallicrafters

E.F.Johnson

HI-Z

Kenwood

TS520/TS530

TS820/TS830

+Mic

-Mic

+Mic

-Mic

PTT

GND

4PinMicConnectorPin3

4PinMicConnectorPin2

4PinMicConnectorPin3

4PinMicConnectorPin2

4PinMicConnectorPin3

4PinMicConnectorPin1

4PinMicConnectorPin3

4PinMicConnectorPin1

2PinMicConnectorPin1

2PinMicConnectorPin2

2PinMicConnectorSpring/Case

4PinMicConnectorPin2

4PinMicConnectorPin1

4PinMicConnectorPin4

Equalizer/NoiseGateMicOuttoXcvrcablewiring

Power GND

+7to14Vdc

ShieldofCable

DINconnectorsshownonthesidetobesoldered

DONOT SOLDER TOSHIELDOFDIN

TABLEOFCONTENTS

Introduction...........................6

FrontPanelControls.....7-9

-Pictorial

-PowerOnLED

-EqualizerOn/Off

-EqualizerControls

-NoiseGateOn/OffSwitch

-NoiseGateLED

-NoiseGateLevel

-NoiseGateDelay

-MicGainLED

PowerOn/Off/PhoneVolumecontrol

-3-

RearPanelControls..10,11

-Pictorial

-MicSelect

-MicInput(8pin)

-MicInput(XLR)

-MicInput(RCA)

-PTTInput(RCA)

-MicOutputSelect

-MicOutput A

MICOUT&POWERCABLEWIRING

-26-

AlincoDX77

Kenwood

TS130/140

TS430/440

TS850/TS870

TS930/940/950

SG2020

JapanRadio

JST-135

JST-245

Yaesu

FT990/ft992

FT1000MP/M-V

+Mic

PTT

GND

ICOM

735

745/746

756/756PRO

775

781

KACHINA

Gnd

PTT

+Mic

Gnd

PTT

-Mic

+Mic

8PinMicConnectorPin8

8PinMicConnectorPin5

8PinMicConnectorPin3

8PinMicConnectorPin1

8PinMicConnectorPin7

8PinMicConnectorPin5

8PinMicConnectorPin6

ShieldofCable

8PinMicConnectorPin2

8PinMicConnectorPin6

8PinMicConnectorPin7

8PinMicConnectorPin1

8PinMicConnectorPin8

+Mic

PTT

GND

-Mic

8PinMicConnectorPin6

8PinMicConnectorPin7

ShieldofCable

8PinMicConnectorPin8

ICOMBALANCED

MODULATOR

746

756/756PRO

775

781

910H

+Mic

PTT

GND

-Mic

8PinDINConnectorPin3

8PinDINConnectorPin2

ShieldofCable

8PinDINConnectorPin4

DINconnectorsshownonthesidetobesoldered

DONOT SOLDER TOSHIELDOFDIN

Yaesu

FT102/107

FT707/747/757/767

FT847

FT1000/1000D

TABLEOFCONTENTS

-4-

RearpanelControls...........12

-MicOutputB

-Phones

-Power

BottomPanelControls...13

-Pictorial

-MicInGain

-MicOutputLevel

-Micinputimpedance

Schematics

-8bandMotherBoard...14,15

-8BandEQPotBoard…16

GettingStartedTutorial..18,19

- AdjustingMicInLevel

- AdjustingMicOutLevel

- AdjustingNoiseGateLevel

- AdjustingNoiseGateDelay

- AdjustingtheEqualizer

ChangingEQBandpass

CenterFrequencies........17

-25-

MICOUTWIRINGOPTIONS

MICOUT A/B

5PinMaleDIN

Dinconnectorsshown

onsidetobesoldered Gnd

PTT

-Mic

+Mic Balanced

Output

Hi-ZOutput

LowImpedanceBalancedOutputtoLowImpedanceRadio

5PINDINMICOUTPUTCONNECTION

LowImpedanceUnbalancedOutputtoLowImpedanceRadio

LowImpedanceUnbalancedOutputtoHighImpedanceRadio

HighImpedanceUnbalancedOutputtoHighImpedanceRadio

DONOTCONNECTMICWIRESHIELDTOSHIELDOFDINCONNECTOR

CONNECTONLY ASSHOWN

MICOUT A/B

5PinMaleDIN

Dinconnectorsshown

onsidetobesoldered Gnd(Miccableshield)

PTT

-Mic

+Mic Balanced

Output

MICOUT A/B

5PinMaleDIN

Dinconnectorsshown

onsidetobesoldered Gnd(Miccableshield)

PTT

+Mic Unbalanced

Output

MICOUT A/B

5PinMaleDIN

1KOhm

Dinconnectorsshown

onsidetobesoldered Gnd(Miccableshield)

PTT

+Mic

MICOUT A/B

5PinMaleDIN

1KOhm

Dinconnectorsshown

onsidetobesoldered Gnd(Miccableshield)

PTT

HI-Z

INTERNAL WIRING

-24- -5-

TABLEOFCONTENTS

PCBoardsandParts

-MotherBoard...................21

-8BandEQBoard.............22

-RearConnectorBoard....23

Internalwiring........................24

PreliminaryEqualizerSettings...20

MicOutandPowerCableWiring

-MicOutWiringOptions....25

-MicOutandPwrCableWiring26,27

MICIN

Shortest

Lead

Shortest

Lead

Shortest

Lead

Shield

not

Connected

J16 C41-.01uf

MICIN

PIN1

PIN7

PHONES

PIN1

PIN2

J1-3

J1-1

J1-15

J1-2

J1-16

J1-14

J1-13

10“

16-1/2“

10“

6“

10“

E17

NotethatJ1-Xistheflatribbon

cableshownonpage15

Shield

INTRODUCTION

W2IHY AUDIOEQUALIZER

AND

NOISEGATE

Analoganddigitaltechnologyhaveformanyyearsbeenusedinthe

audioindustrytodoaudioequalizationandnoisereduction.Many

amateurshavepurchasedaudioequalizersandotherequipmentwith

thehopeofimprovingtheirtransmittedaudiosignal. Theamateurswho

havesucceededhaveinmanycaseshadtopaypremiumpricesfor

audioequipmentthatnotonlyrequiredmodifying,toproperly

interfacewiththeiramateurstations,butalsohadtobehardenedto

tolerateR.F.

TheW2IHY 8Band AudioEqualizerandNoiseGatesolvestwobasic

problemsmanyhamsexperience. The AudioEqualizerallowsthe

usertochangethetransmittedaudiofrequencyresponsewithout

changingmicrophonesormicrophonecartridges. Transmittedaudio,

withsubstantialhighfrequencycontent,canbeusedtoworkDXor

communicateinbandconditionswherethereisasignificantamount

ofnoise. A balancedfrequencyresponsemaybemoredesirablein

strongsignal,fullnoisequietingenvironments.Manyamateuroperators

transmitaudioinhighambientnoiseenvironments. Typicalhighnoise

sourcesincludelinearamplifierfans,dehumidifiers,roomair

conditioners,roadandwindnoiseduringmobileoperation,etc..

TheNoiseGateeliminatestheaforementionednoisefrombeing

transmitted.Ontheairtestsinhighambientnoiseconditionshave

showntheNoiseGatetobeveryeffective. Theremovalofmoderate

toveryhighlevelsofambientnoise,fromthetransmittedaudiosignal,

resultsinaudiowithincreasedclarityandpresence.

ExtensivetestingwasdoneoftheNoiseGateandEqualizer. Theunit

hasbeendesignedtoworkinhighRFenvironments.Wefeelso

confidentthatyouwillbedelightedwiththeunit

TheW2IHY Audio

EqualizerandNoiseGaterepresentsaffordableaudiotechnology

designedforamateurradiouse.

weoffera30day

moneyback,noquestionsasked,guarantee.

-6- -23-

8BANDEQREARCONNECTOR

PCBOARDLAYOUT ANDPARTS

C41,C42-.001ufmylar

C40-.01mylar,

C7,C13,C37,C39-.1uFceramicmonolithic

C39-4.7uftantalumelectrolytic

J2,J4,J5-Male5PinDIN

R33,R34-47Kohm¼watt5%resistor

RFC2,RFC3-100uhR.F.choke

RFC4,RFC5-470uhR.F.choke

S4-4pole3positionrotaryswitch

S5-4PDT slideswitch

T1-600ohm:600ohmaudiotransformer

FRONTPANEL CONTROLS

This sectiondescribes each ofthecontrols onthefrontpanel. You

can readthroughthis sectionnow.Someofthedescriptions

willbemoremeaningfulafteryou first work throughthegetting

startedtutorial.

This switchandpotentiometer(Pot.)turns theunit's poweronand

offandis also used toadust theaudiolevel intothePhonejack (18)

This LEDgoes onwhenpoweris onintheunit.

This switchturns theequalizer onandoff.Whentheequalizer is

offadjusting theequalizer's controls has noeffect ontheoutput

audio.

(1)

(2)PoweronLED(LED3)

(3)Equalizer On/OffSwitch(S3)

PowerOn/OffSwitch(S1)/Phones(monitor)VolumeControl(R29)

-7-

8BANDEQBOARD

PCBOARDLAYOUT ANDPARTS

*MountedonpinsideofP.C.board

-22-

C15-.1uFmylar

C16-.1uFmonolithic

C17-.18uFmylar

C18-19-4.7uF Tantalumelectrolytic

C20-100uFelectrolytic

R1-10ohm¼watt5%Res

R2-R31Kohms¼watt5%Res

R4-3.3kohm10pin9RESSIP

R5-R6-3.3Kohm10Pin5ResSIP

R7-15.0Kohm¼watt1%Res

R8-100Kohm10Pin9ResSIP

R9-R1010Kohm¼watt5%Res

R11-R18,R20100KohmSlidePots*

R195KohmSlidePot*

R21-1Mohm10Pin9ResSIP

R22-R231m10PinResSIP

U1-U3 Tl074orJRC2060(14PinDIP)

J1(16PinDIP)

C1-300pFmylar

C2-390pFmylar

C3-560pFmylar

C4-.0012uFmylar

C5-.003uFmylar

C6-.0022uFmylar

C7-.0039uFmylar

C8-.0047uFmylar

C9-.0056uFmylar

C10-.01uFmylar

C11-.012uFmylar

C12-.018uFmylar

C13-.022uFmylar

C14-.047pFmylar

FRONTPANEL CONTROLS

(4)Equalizer CONTROLS(R11-R18)

(5)NoiseGateOn/OffSwitch(S2)

(6)NoiseGateLED(LED1)

These slide potentiometers work only whentheEqualizer On/Off

Switch S3is intheonposition. Thepotentiometers control

theoutputof8bandpass filters. Thecenter frequency ofthese

filters are50Hz, 100Hz, 200Hz, 400Hz, 800Hz, 1600Hz,

2400Hz and3200HZ. Thescale,forsetting these potentiometers,

is calibrated between-16db.to+16dB.Pushing apotentiometer

forward(up)willincreasetheoutputoftheequalizer withinthe

bandpass ofthefilterwhose slide potentiometeris changed.

Pushing apotentiometerbackward(down)willdecreasethe

outputoftheequalizer withinthebandpass ofthefilterwhose

slide potentiometeris changed. Settingall8potentiometers atthe

zero marking willproduce audioataboutthesame outputlevel

as whentheEqualizer On/OffSwitch S3(3)is intheoffposition.

Adjusting theequalizer 50Hz, 100Hz and200Hz slide pots

affects theheaviness /weightoftheaudio. Adjusting theequalizer

400Hz and800Hz slide pots affects thewarmthoftheaudio.

Adjusting theequalizer 1600Hz, 2400Hz and3200Hz slide

pots affects theclarity andpresenceoftheaudio.

This switchturns thenoise gateonandoff.Whenthenoise

gateis offchanging thegatedelay orlevel controls has

noeffect ontheaudio.Whenthenoise gateis offaudiois

always beingpassed(gated)throughthenoise gatetotheoutput.

This LEDis used tohelpproperly adjust thenoise gatelevel

control andtoindicate whenaudiois beingsent (gated)tothe

output. TheLEDbeingon(green)indicates thataudiois being

gatedthroughtheunittotheoutput. TheLEDbeingoffindicates

thataudiois notbeingpassed(gated)throughtotheoutput.

WhentheNoise GateOn/OffSwitch (5)is intheoffposition the

noise gateLEDis on.

-8-

8BANDEQMOTHERBOARD

PCBOARDLAYOUT ANDPARTS

-21-

*PartsmountedonpinsideofP.S.Board

C1,C3,C4,C6,C14,C25-C28,C334.7uFradialelectrolytic

C7*,C13*,C16,C17,C32.1uFceramicmonolithic

C8-22uFradialelectrolytic

C9,C29-4.7uFnonpolarizedradialelectrolytic

C10,C11,C12,C15,C31-100uFradialelectrolytic

C2,-10uFradialelectrolytic

C4-1uFradialelectrolytic

C18-C20-.1uFmylar

C5-.033uFmylar

C23-C24-470uFradialelectrolytic

C21,C34-.01uFmylar

C36-120pfceramic

C22,C35-.001uFmylar

D1,D2-1N914

D3-1N4001

LED1-GreenLED;LED2-RedLED;LED3- Amber

Q1-2N3417

REG1-7805withheatsink

Rfc1-470uHR.F.choke

R1,R2,R22-10Kohm5Resistor10pinSIP

R3-100ohm5Resistor10pinSIP

R4-1Kohm5Resistor10PinSIP

R5,R6,R27,R30-10ohm¼watt5%Resistor

R7,-6.8Kohm¼watt5%Resistor

R8,R9-5.6Kohm¼watt5%Resistor

R10-10Kohm¼wattResistor

R11-2.2Kohm¼wattResistor

R12-100KohmhorizontalPotmountedonPCboard

R13-20KohmhorizontalPotmountedonPCboard

R19-33Kohm¼watt5%Resistor

R14-75Kohm¼watt5%Resistor

R15*-R17*-25KohmSlidePot

R18*-5KohmSlidePot

R21-680ohm5Resistor10PinSIP

R23-200ohm¼watt5%Resistor

R20,R24,R25,R33*.R34*-47K¼watt5%Resistor

R26-0Ohms(Pieceofwire)

R28-22Kohm5Resistor10pinSIP

R29*-10KPotwithSwitch(Usedforvolumecontrol)

R31-1Kohm¼wattResistor

R32-33Kohm¼watt5%resistor

U1,U5- Tl074orJRC2060;U2-74HC00;

U3-74LS123;U4-74HC4053;U6-LM386-1

FRONTPANEL CONTROLS

(7)NoisegateLevel(R19)

(8)NoiseGateDelay(R20)

(9)MicGainLED(LED2)

Thisslidepot.worksonlywhenthenoisegateison. Thispot.

setsthelevelatwhichbackgroundnoisewillbenotgatedtothe

audiooutput.Pushingthiscontrolupwillmaketheunitless

sensitivetohigherbackgroundambientnoise.Pushingthis

controldownwillmaketheunit,moresensitivetobackground

noise.

Thiscontroladjuststhelengthoftimeaudiowillbegatedtothe

outputafterthenoisegatehasautomaticallyturnedoff(Noisegate

LEDoff).Pushingthedelayslidepot.upincreasesthedelay

(decay)time.Pushingthepot.downdecreasesthedelaytime.

ThisLEDisusedtohelpadjusttheMICInGainpot.Whenthe

LEDgoesonthisindicatesthattheEQisbeingoverdriven.

ThisLEDshouldnevergoon.

-9-

-20-

PRELIMINARY EQUALIZERSETTINGS

-10-

(10)MicSelect(S4)

(11)MicInput(J8)

ThisthreepositionswitchselectstheICOM,KENWOODor

YAESUmicrophonepluggedintothe8pinMicInputJ8(11).

8Pinmicrophonemaleconnector.Donotusethisconnector

whenMicinJ6(13)orMicInJ9(12)arebeingused.

REARPANEL CONTROLS

IcomKen Yaesu

+Mic+Mic

+5VPTT+5V

PTT+5V

PTT

Gnd-MicGnd

Gnd+Mic

PTT

Gnd

14 16 19

13 17 18

The controlsetsthedecaytimeofthetrailing

edgeofthe Audio,whenthenoisegateturnsoff. This

circuitryexponentiallyreducestheaudiooutputwhenthereisno

audiopresentinthe .(Thedelaycircuitryhelpstomakethe

transitionsofgatingandnotgatingofaudiosmoothandmore

pleasingtotheear.) Thedurationoftheexponentialdecay

isdependentonthesettingofthe control. The

delaycontrolsetataminimumvalue(theslidepotalltheway

down)willexponentiallydecaytheaudioinabout100milliseconds.

Thedelaycontrolsetatamaximumvaluewillallowtheaudioto

decayoverafewseconds.Ontheairtestsshowthewhitebarpart

oftheNoiseGateDelayrangegivesverypleasingaudiotransitions.

(decaytimeofabout.3to.5second). Youcanexperimentonyour

owntofindthebestsettingforyou.

Ifyouhavemedium-to-highlevelsofambientnoisepresentwhen

youaretransmitting,withthe intheoff

position,whenyoustoptalkingyourpowermeterwillindicateR.F.

stillbeingtransmitted.(setpowermeteronavg.powertodothis

experiment).Whenthenoisegateisturnedonandproperly

adjustedwhenyoustoptalkingthepoweroutputwilldroptothe

bottomofthescale(nopoweroutput).Peoplewholistentoyour

signalwillbeabletohearthedifferenceandtheywillwonderwhere

thenoisewent.

Turnthe on.Setall8equalizerslide

potentiometerstothe0dbpoint(markedonthecase).Refertothe

PreliminaryEqualizerSettingtableonpage20.Usethistable,asa

guidetodetermineinitialstartingpointsforequalizersettings.Itis

suggestedthatthephonesmonitorbeutilizedtoassistinadjusting

theequalizer. Asyoumodifyyourequalizersettings(todeterminewhat

theoptimalsettingisforyou)itisrecommendedthatyoumake

changesstartingatthehighestaudiofrequency(3200Hz)firstand

changethenextlowestfrequency(band)nextuntilthelowestfrequency

(50hz)isadjusted.Ontheairexperimentationwillberequired

tofindtheoptimalsettingsbasedupontheusersvoice

characteristicsandbandconditions.

NoiseGateDelay

MicOut

MicIn

NoiseGateDelay

NoiseGateSwitch

EqualizerSwitch

AdjustingThe AudioEqualizer

-19-

GETTINGSTARTEDTUTORIAL

REARPANEL CONTROLS

-11-

(12)MICInput(J9)

(13)MicInput(J6)

This3pinXLRfemaleconnectorworksindependent

ofthemicselectswitchandmaybeusedasanothermicsource.

DonotusethisconnectorwhenMicInJ6orJ8isbeingused.

ThisRCA femaleconnectorisusedasanauxiliary

microphoneinput. Thisconnectorworksindependentofthemic

selectswitchandmaybeusedforanotheraudiosourceor

microphone. Thisinputisalsolowimpedance.Donotuseifmic

isconnectedtoJ8(11)orJ9(12).

(14)PTTINPUT(J7)

(15)MICOutSelect A/B(S4)

(16)MicOutput A (J5)

RCA femaleconnectorforauxiliarypushtotalkcontrol. A foot

switchorothercontrolmaybeconnectedtothisconnector.

Groundingthecenterjackoftheconnectorgroundsthepush

totalklineontheMicOut.

Thistwopositionslideswitchdirectsaudiotothe5PinDIN

MicOut A (16)orthe5PinDINMicOutB(17).

5PinfemaleDINconnectorthathasnoisegate/equalizer

audiopluspushtotalkoutputted. Thisconnectorisactive

onlywhentheMicOutSlideSwitchS4(15)isinthe

MicOutSelect A position.

XLR PIN Description.

1 gnd. / shield

2 + Mic

3 - Mic

-18-

Beforepluggingthepowertransformer intothewallpreset the

followingcontrols as indicated:

and switches alloff.

toselectmicrophone you willbeusing.

Connect your microphone intothe rearconnector.Plugthe

powertransformer (module)intothewallandintothe

connectoroftheunit. Attach themicrophone cable betweenyour

transceiver/transmitterandthe oftheunit.Ifthemicrophone

beingused is anelectret mic (ICOMHM12,SM6,...)andrequires

D.C.onthemic lineplugtheshorting jumpersupplied ontothe

pins atthebottomofthecaseotherwise leave itoff. Turn

the switchon. Theorange/yellow should goon.

,using ascrewdriver,turnthe

(located atthebottomoftheunit)clockwise

untilthe just goes on.NowturntheMic inLevel control

counterclockwise suchthat whenyou

speak intothemic.

,using ascrewdriver,turnthe

control clockwiseuntiltheaudiolevel, as shown by

your transceiver's/ transmitters meteringis attheproperlevel. If

you areusing push totalk onyour transceiver you willhave to

push thePTT switchonyour microphone whilemaking this

adjustment.

Turnthe on.(Please notethatwhenthe

is offthe should always go

onindicating audiois beingsent /gatedtothe .Whenthe

is turnedonthe may beon

oroffdependingontheposition ofthe control

andthe audiolevel.) Adjust theNoise GateLevel control until

theNoise GateLEDjust goes off.

(Ifaudiois coming fromyour

transceiver's/ receiver's speakeryou should turnofftheaudio.)

Whenyou nowtalk intoyour microphone the

should goonindicating audiois beingsent tothe When

you stop talking the should turnoffindicating

thataudiois notbeingsent andbackgroundnoise is notbeing

sent /gatedtothe .

Power,Equalizer NoiseGate

MicSelect

MicIn

Power

MicOut

MIC

Jumper

Power PoweronLED

MicInLevelControl

MicLED

MicOutLevel

NoiseGateSwitch

NoiseGateSwitch NoiseGateLED

MicOut

NoiseGateSwitch NoiseGateLED

NoiseGateLevel

MicIn

NoiseGateLED

MicOut.

MicOutLED

MicOut

AdjustingtheMicLevels

theLEDnevergoeson

Whiletalking intothemicrophone

This adjustment should bemade

withthelevel ofambientnoise thatwillbepresent whenyou will

betalking intothemicrophone.

NoiseGate Adjustments

GETTINGSTARTEDTUTORIAL

-12-

(18)Phones(J3)

(19)Power

1/4“Stereoheadphoneconnectorusedtomonitoraudiofrom

theequalizer. Theoutputlevelofthisconnectoriscontrolledby

phonevolumecontrolR29(1)

(Aninlineadapter

shouldbeusedwithheadsetsthatdonotuse1/4“stereo

connectors.StoreslikeRadioShackhaveaudioplugadapters

available.)

5PinDinconnector.7-14VDCinputat100ma.

Headphonesusingotherthan

1/4“stereoconnectorsmaynotoperateproperlywhen

pluggedintostereophonesconnectorJ3.

+7to14V

GND

Power

5PinMaleDIN

Dinconnectorsshown

onsidetobesoldered

(17)MicOutputB(J4)

5PinfemaleDINconnectorthathasnoisegate/equalizer

audiopluspushtotalkoutputted. Thisconnectorisactive

onlywhentheMicOutSlideSwitchS4(15)isintheMicOut

selectBposition.

Gnd

PTT

-Mic

+Mic Balanced

Output

Hi-ZOutput

MICOUT A/B

5PinMaleDIN

Dinconnectorsshown

onsidetobesoldered

REARPANEL CONTROLS

-17-

C2-.1uf

100Hertz

C1-.01uf

3.3K R2

3.3K

R5-100K

U2b

TL074

100K

1M R4

1M

EachEQbandpassfilterisverysimilar.Thecenterfrequencies,ofeach

bandpassfilterisdeterminedbythevaluesofthecapacitorsand

resistorsused.Theequationsbelowdefinewhatcapacitorvaluesare

requiredforagivencenterfrequency.Belowisaschematicofa

bandpassfilterwithacenterfrequencyof100Hz.

C1=(.9046)/(FreqinHz.)<=Inuf=>C2=C1x10

Theaboveequationsarevalidforonlytheresistorvaluesshowninthe

schematicabove.

Thebandpassfilterintheschematichasacenterfrequencyat100hz.

example:Thecapacitorvaluesrequiredtoobtainabandpassfiltercenter

frequencyof4800hziscalculatedasfollows:

C1=.9046/FREQ=.9046/4800=,0001885UF=188.5PF

C2=C1x10=.0018858uf

Theclosestrealvaluecapacitorsthatcanbepurchasedareasfollows

-C1calculatestobe188.5pf.Theclosestrealvaluethat

canbepurchasedis180pf

-C2calculatestobe.001885uf.Theclosestrealvaluethat

canbepurchasedis.0018uf

CHANGINGEQBANDPASS

FILTERCENTERFREQUENCIES

BOTTOMPANEL CONTROLS

(20)MicJumper

(21)MicInGain(R12)

Microphonecartridgeswith

verylowoutput(LikeaHeilHC4orHeilHC5)mayrequire

theMicInGainControltobeadjustedtomaximumgain.

(22)MicOutputLevel(R13)

(23)MicInputImpedance

Pluggingthejumper(shortingblock)puts+5VontheMicIn

lineofthemicrophone'scartridge(11,12&13).Requiredformic's

suchasICOM’sHm12,HM36andSm6andtheHeilHmiandMH2

(madefortheElecraftradio’s)andotherelectretmicrophones.

Thispot.,whenturnedclockwise,increasesthemicrophone

amplifier'sgain. Thegainshouldbechangedwhilespeaking

intomicrophoneuntilMicLED(10)justbarelygoesonNow

turnthepotcounterclockwise,whilespeakingintothemictil

theLEDNEVERgoeson.(TheLEDgoingonindicatesthat

theEQisbeingoverdriven.)

Changestheunit'saudiooutput.(Clockwiserotationincreases

output.)

Insertionofoneofthesejumpers(shortingblocks)selects

200or600ohminputimpedance.

Nojumpersconnectedselects

highimpedance

-13-

20 23 21

8 Band Equalizer Pot Board with Noise Gate Pots

Audio IN

C7 - .0039 uf

U3b

TL074

390 pf

C20 - 100 uf C16 - .1 uf R1

R16 - 100 K

R8f

100 K

R17 - 100 K

R21g

R23c

R4g

3.3K

R6b

3.3K R6c

3.3K

+5 V

U3c

TL074

+R2

1K R3

R8G

100 K

R23b

1 M

315

C17 -.18uf C15 - .1uf C14 - .047uf C13 - .022uf

400 Hertz

.0022uf

200 Hertz

100 Hertz

C10 - .01uf

C8 - .0047uf

R8a

100K

+5V

14.3K

R4b

3.3K R5b

3.3K

R4c

3.3K

R5c

3.3K

R4d

3.3K

R14 - 100 K

R21d

R22c

R21c

1M R8c

100K

R21A

R22a

R11 - 100 K R12 - 100 K R13 - 100 K

C12 - .018uf

U1a

TL074

U2a

TL074

U2b

TL074

U2c

TL074

---

C9 - .0056 uf

C11 - .012 uf

C5 - .003 uf

2400 Hertz

3200 Hertz

1600 Hertz

800 Hertz

10K

R10

10K

C19

4.7 uf

+5V

11 1

C18

4.7 uf

R8b

100K

R21B

1 M R22b

1 M

R5a

3.3K 1

R8d

100K

R22d

50 Hertz

U2d

TL074

U3a

TL074

+14

+5V

300 pf

J1-7

J1-6

R15 - 100 K

R21e

1 M

R23a

1 M

R4e

3.3K

R6a

3.3K

R8e

100 K

R21h

1M R23d

R4f

3.3K R6d

3.3K

J1- 12

J1- 4

J1- 5

J1- 9

R4h

3.3K

R18 - 100 K

R20 - 5K

R19 - 100 K

560 pf

.0012 uf

U3d

TL074

Audio Out

+ 5V

GND

R8h

100 K

R21f

1 M

R5d

3.3K

R4a

3.3K 1

5 7 8

J1-10

J1-11

Noise Gate

Delay Control

Noise Gate

Level Control

Note: Slide Pots are mounted on Pin side of the board

Julius Jones REV 1 6 -14-99 Note: J1 goes to a 16 pin DIP socket

WiMo W2IHY Operating instructions

Brand: WiMo

Model: W2IHY

Category: Microphones

Type: Operating instructions

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WiMo W2IHY Operating instructions

WiMo W2IHY Operating instructions

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