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WiMo W2IHY, 3 x 4 SWITCH PLUS Operating instructions

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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
HI-Z
Kenwood
TS520/TS530
TS820/TS830
+Mic
+Mic
+Mic
+Mic
-Mic
-Mic
-Mic
-Mic
-Mic
+Mic
+Mic
-Mic
PTT
PTT
PTT
PTT
PTT
PTT
GND
GND
GND
GND
GND
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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
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
ShieldofCable
ShieldofCable
ShieldofCable
ShieldofCable
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
K2
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
Gnd
PTT
PTT
-Mic
-Mic
-Mic
-Mic
+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1
8PinMicConnectorPin7
8PinMicConnectorPin5
8PinMicConnectorPin6
ShieldofCable
ShieldofCable
ShieldofCable
ShieldofCable
8PinMicConnectorPin2
8PinMicConnectorPin2
8PinMicConnectorPin6
8PinMicConnectorPin7
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
J2
MICIN
PIN1
PIN7
J9
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
Shield
Shield
Shield
Shield
Shield
Shield
Shield
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-
1
2
3
4
5
69
8
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
1
2
5
6
7
8
J8
Pin
PTT
PTT
Gnd
Gnd
11
14 16 19
13 17 18
15
10
12
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
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
7
R1
3.3K R2
3.3K
R5-100K
U2b
TL074
+
-
R6
100K
R3
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
22
8 Band Equalizer Pot Board with Noise Gate Pots
Audio IN
C7 - .0039 uf
U3b
TL074
7
C2
390 pf
C20 - 100 uf C16 - .1 uf R1
10
R16 - 100 K
R8f
100 K
R17 - 100 K
R21g
1M
R23c
1M
R4g
3.3K
R6b
3.3K R6c
3.3K
+5 V
U3c
TL074
+
10
9
8
-
+R2
1K R3
1K
R8G
100 K
R23b
1 M
8
8
8
16
5
2
315
6
1
71
4
3
1
4
3
C17 -.18uf C15 - .1uf C14 - .047uf C13 - .022uf
400 Hertz
C6
.0022uf
200 Hertz
100 Hertz
C10 - .01uf
C8 - .0047uf
R8a
100K
+5V
1
35
6
7
2
R7
14.3K
1%
R4b
3.3K R5b
3.3K
R4c
3.3K
R5c
3.3K
R4d
3.3K
R14 - 100 K
R21d
1M
R22c
1M
R21c
1M R8c
100K
R21A
1M
R22a
1M
R11 - 100 K R12 - 100 K R13 - 100 K
C12 - .018uf
U1a
TL074
U2a
TL074
U2b
TL074
U2c
TL074
+
++
13
12
+
10
9
8
---
C9 - .0056 uf
C11 - .012 uf
C5 - .003 uf
2400 Hertz
3200 Hertz
1600 Hertz
800 Hertz
R9
10K
R10
10K
C19
4.7 uf
+5V
4
11 1
3
2
C18
4.7 uf
+
+
-
R8b
100K
R21B
1 M R22b
1 M
R5a
3.3K 1
1
1
2
2
1
1
4
3
2
1
3
3
4
4
3
3
3
53
1
1
4
4
4
1
1
1
5
6
2
56
31
1
2
2
2
R8d
100K
R22d
1M
50 Hertz
U2d
TL074
U3a
TL074
+14
+
3
21
+5V
+
6
5
-
--
C1
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
1M
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
C3
560 pf
C4
.0012 uf
U3d
TL074
14
13
12
+
-
Audio Out
+ 5V
GND
R8h
100 K
R21f
1 M
R5d
3.3K
R4a
3.3K 1
5
5 7 8
1
2
8
7
19
9
9
1
18
7
31
2
7
82
3
1
1
3
2
1
7
7
1
1
6
6
6
2
3
2
1
2
1
2
1
3
1
1
1
1
1
23
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
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