CircuitWerkes RP-1 User manual

1
CircuitWerkes
Technical Manual
CircuitWerkes
3716SW3
rd
Place· Gainesville, FL 32607
[phone] · Fax [phone]
RemotePak Studio Extension
RP-1
© 1992-1996CircuitWerkes AllRightsReserved. Allinformationcontainedwithinisproprietary.
NopartofthismanualmaybereproducedorcopiedwithouttheexpresswrittenconsentofCircuitWerkes.
Preliminary
Manual

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Bal. Program
amplifier out
mic pre
1kHz osc
Aux In
Balanced
Cue In
LED Meter
PGM
Cue
TheCircuitWerkesRP-1 is describedin the theblock diagram offigure 1.
Sidetone
Headphone Amp
Aux
IN Phones
-20 -10 -7 -5 -3 -1 0 +1 +2 +3 CW
CircuitWerkes
RemotePack
Studio Extension
PTT Mic / Osc Power
Off / On
Pgm
Cue
Meter
Volume
Cough
1
2
374
5
6
8
FrontPanelControls andConnections
Figure2. The RP-1'sfront panel layout.
1)MicInconnector. XLRconnector for miclevelinputsignals. Thisinputis normallybalancedand
capableofaccomodatingmost microphone outputlevels.Rearmostpotentiometeronleft sidecontrolsmic
inputlevel.
2)Aux inconnector. !/8" monophone jack acceptsunbalanced signalsfrom casstte decks,portable DATs,
orotherline levelsources. Frontmostpoton leftsidecontrols Aux-in level.
3)HeadPhone Jack. 1/4"stereo headphonejack, bothchannels drivenmono. Since both channelsare
drivenfromthesame amp,insertingamonoplug intothisstereojackwill shorttheoutput. Continued
operationinthismodewillresultinpartsgettingwrminside the unit,andstillnosoundwillcomefromthe
headphones. Ifyouusesingle-muff headphones, wirethemtip-sleeveonatip-ring-sleeve plugandleave
theringfloating. Goodfor 1/2Watt maximum atmediocredistortionspecs.
4)Power switch. OffandOn. Pretty Simple. Leaveit onovernight;kill thebatteries. Remember to turn
offthepower whentheunitis notinuse.

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5)MeterSelect Switch. Switchesthemetering circuitryfromProgram output toCueinput. The scalefor
themetering LEDstracks closelyandis referencedto 0dBm(In /Out) at 0vu.
6)Headphonevolumecontrol.
7)Mic/Oscswitch. Youguessedit; switchesbetweenmicand Oscillatorfunctions. TheOscillatorlevel
comespreset fromCircuitWerkesat 0dBm,but youmay readjustit with theOSC levelpot onthe backof
theunit. When the oscillatoris engaged, theMIC is muted. Whenthe Mic isselected the Oscillatoris
disabled. Auxinputaudiois alwaysavailableifpottedup.
8)Cough /PTT switch. Ifyou orderedyour RP-1equipped with 4pin XLRsinstead of3 pin,its default
setforPush-To-Talk actiononthis switch. Allotherunits are jumperedforthis switchtobe a"cough"
switch.
SidePanelContols
TheLeftsideof theboxiswhereyou'll findthemicleveltrim andtheaux-inleveltrim. These twocontrols
determinehowmuch ofeachsourcegets mixedintothe PROGRAM output.
RearSurface ControlsandConnectors
Theprogram outconnectoris abalancedoutput, nominally0dBm, designed todrive a600ohm load. The
wiringofthe XLR3 (male)followsindustrynorms with1beingshield/ground, 2-audio,3 +audio. On
AtlantaTestsets(with 4pinXLR males)pins 1&2 arethe balancedheadphonecue-audio input;pins 3&
4 are balanced PROGRAM audio + and - out.
Theheadphone balancedcue inputis a1/8" 3conductor jack wiredtip +,ring -,sleeve ground. Thiscue
inputhasan inputimpedenceofat least20kOhms. It'slevel into theheadphoneamp circuitiscontrolledby
itsassociatedlevel pot. This controldoesnoteffect themeteringcircuit.
Theoscillator levelis alsocontrolledfrom aback panelpot. It ispreset to 0dBm.
MicLevel Aux In Level
CW
Headphone Amp
CircuitWerkes
RemotePack
Studio Extension
Program Out
IN
Level Oscillator
Level

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Operation
MicandOscillatorfunctions aremutuallyexclusive. TheAux-In sourceisunaffectedby the MIC/OSC
switch. Becarefulabout flippingtheMIC/OSC switchintoOSC with headphoneson. Theoscillator can
bequiteloud.
Metering. Themetering can monitorthe headphone Cueinput or theProgram output. The Metering
Selectswitch doesnoteffect whatfeedsthe headphoneamp or theprogram audiooutput.
PTT and Cough. The "SW MODE" jumper located just behind the PTT/Cough switch selects which
function the switch performs. If the jumper is placed between the center pin and the pin closest to the
headphone jack, the switch will be a Push-To-Talk switch, in the other position, the switch is a Cough switch
which kills the mic preamp for as long as you press.
Batteryreplacement. Remove thebattery cover door.. Thebatteries(two alkalinenine volts)go in the
batteryholder clipsbeside thepcboard. For bestfit, orientthe batterieswith the roundterminal closer to
thebottomof theenclosure.
Care & Feeding
Keeptheunit outofrain, sleetandsnow,active volcanoes, etc. Extremelyheavyhandling (dropkicks,
uncaughttossesand the like)mayknockthe batteriesoutoftheir holders;ifyoufeel orhearanything
bouncingaroundinsidetheboxturnoffthepowerimmediatelyandinvestigate.
Mostparts on theboard thatcould conceivably"go bad" aresocketed. If youmust removethe PC board
fromtheenclosure, you'llhavetoremove thecover, removethefrontXLR copnnector(itscables easily
unplugfromthe PCB (notetheirplacementand orientation),removetheknobs fromthefiveboard-edge
pots,remove the fourscrews holding theboard down andthe board willcome out woithoutmuch more
difficulty. You'llfindthat itiseasier toremoveif thecornerclosestto VR1,theMIC pot)comesout first.
Reassembleinreverse order.
A note about the Potentiometer shafts: they are actually pretty easy to remove. The back of the shaft
portrudesever-so-slightlyfrom thebackof thepotbody; where itissplit. you justgentlysqueeze thesplit
endofthepot together withneedle-noseplierswhilepullingthe shaftout. Whenreassembling,theyjust
snapback in. Now, isn'tscience wonderful?
RP-1 PC Board
Layout

5

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REPAIR OR SERVICE INFORMATION
Intheeventoftheneedforserviceorrepair,callCircuitWerkesat(352)335-6555foraReturnMerchan-
diseAuthorizationnumber(RMA). Thencarefullypackagetheunitalongwithanoteoftheproblemand
sendittotheaddressbelow. ClearlyindicatetheRMAnumberontheoutsideofthebox. Wecannot
acceptreturnswithoutanRMA. Besuretoincludeyouraddress(notaPObox),telephonenumberand
besttimetocall.
CircuitWerkes
ATTN: CUSTOMER SERVICE DEPT.
3716SW3rd Place
GAINESVILLE, FL 32607
CircuitWerkesLimitedWarranty
This product is warranted against defects for two years from date of
purchasefromCircuitWerkesandCircuitWerkesauthorizeddistributors.
Within this period, we will repair it without charge for parts and labor.
Proofofpurchase-daterequired. Warrantydoesnot covertransportation
costs,oraproductsubjectedtomisuse,accidentaldamage,alteration
(exceptas authorizedbyCircuitWerkes), improperinstallation,or
consequentialdamages.
Exceptas providedherein,CircuitWerkesmakesnowarranties,express
or implied, including warranties of merchantability and fitness for a
particularpurpose. Some statesdo notpermit limitationor exclusionof
impliedwarranties;therefore,theaforesaidlimitation(s)orexclusion(s)
may not apply to the purchaser. This warranty gives you specific legal
rightsand you may also haveother rightswhich vary from state tostate.