Pacific Research BMX-III-18 Operation And Technical Manual Download Page 114

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REVISION C

BMX SERIES III CONSOLE

106

PACIFIC RESEARCH & ENGINEERING

DESCRIPTION

PR&E#

Diodes

1N4001

11-7

1N4004

11-17

1N914B

11-13

MBR 350, 50V, 3A

11-39

Zener, 51V, 1N4757A

11-21

DIP Switches

1 DPDT

26-11

1 SPST

26-7

2 SPDT

26-12

2 SPST

26-10

4 SPST

26-13

8 SPST

26-8

Dual Capacitor Shield (for .25 diameter radial capacitors)

80-525

Fader Assemblies

Monaural

90-348-2

Rotary, 5K

24-113

Stereo

90-348-1

Function Modules

Instrumentation Input

95-123

Output Amplifier

95-119

990

95-120

Heatsinks

For TO-220, PC Mount

31-6

+12V, Power Supply

80-508

With Two Mating Positions

80-202-3

Heatsink Assemblies

Dual Regulator, Power Supply

90-338

Single Regulator, Power Supply

90-339

Insulator for TO-220AB, Silpad

31-3

Integrated Circuits

Dual D flip-flop, 4013

21-43

Dual Monostable, 4538

21-76

Dual 5-input Majority Gate, 4530

21-89

Dual 4-input AND, 4082

21-91

Dual 4-input OR, 4072

21-92

Dual SPDT CMOS Analog Switch

21-93

Function Generator, 2206

20-38

Hex Inverter, 4584

21-46

Hex Buffer, Non-Inverting, 4050

21-47

Op Amp, DIP, NE5534N

20-28

Op Amp, Dual, LF353N

20-32

Op Amp, Dual, 8-pin DIP, NE5532N

20-53

Op Amp, Dual, 8-pin DIP, NE5532, Ceramic

20-61

Summary of Contents for BMX-III-18

Page 1: ...el 760 438 3911 FAX 760 438 9277 E Mail info pre com Internet http www pre com P A C I F I C R E S E A R C H E N G I N E E R I N G C O R P O R A T I O N BMX 18 Mainframe PR E 99 260 3CU BMX 22 Mainfra...

Page 2: ...s discard the old pages and post the new status page in the front of this manual NOTE It may be desirable to retain replaced status pages in order to have a record of document changes If deemed necess...

Page 3: ...Monitor Module Connection 23 2 7 7 Monaural Line Output Amplifier Connection 24 2 7 8 Telco Mix Module Connection 25 2 7 9 Send And Return Module Connection 26 2 7 10 Slate Talkback Test Osc Module Co...

Page 4: ...59 3 10 Send And Return Module 60 3 11 Monaural Output Telco Mix Send And Return Module 61 3 12 Slate Talkback Test Oscillator Module 62 3 13 Meter Switcher Module 63 3 14 Remote Line Selector Module...

Page 5: ...7 4 15 VU Meter Buffer Amplifier 87 4 15 1 Function 87 4 15 2 Circuitry 87 4 16 Power Supply Assembly 87 4 16 1 Function 87 4 16 2 Circuitry 87 5 0 OPTIONS AND MODIFICATIONS 89 5 1 Phantom Microphone...

Page 6: ...Schematic 146 7 8 Two Studio Monitor Module Schematic 149 7 9 Monitor Module Switching Schematic 153 7 10 Monaural Line Output Amplifier Schematic 154 7 11 Monaural Output Telco Mix Module Schematic 1...

Page 7: ...nel 202 8 2 Clocks And Timers 203 8 2 1 TD 2 Digital Clock 203 8 2 2 TD 171 Digital Slave Clock 204 8 2 3 DT 4 Digital Timer 205 8 3 PPM Meter 206 8 4 Redundant Power Supply Coupler Unit 206 8 5 Logic...

Page 8: ...6 14 Dual Relay Interface 228 8 6 15 Cassette Skimmer Interface 229 8 6 16 99 38 Console To Interface Cable 230 8 6 17 99 464 Console To TI 2 Interface Cable 231 8 6 18 99 465 Console To CI 2 Interfa...

Page 9: ...nd maintain the BMX III Broadcast Console It is assumed that the reader has a working knowledge of audio control consoles systems and installation practices The BMX III is a very sophisticated device...

Page 10: ...s as well as the overall console system and can be very useful in determining how to best utilize your BMX III The BMX III has been designed functionally mechanically and electronically to provide the...

Page 11: ...odule Adjustable from 12 dBu to 4 dBu Return Module Adjustable from 15 dBu to 4 dBu Monitor Module Inputs Nominal 4 dBu 4 dBu Input Headroom Greater than 30 dB above nominal input MAIN OUTPUTS Load Im...

Page 12: ...se with one microphone 76 dB below output reference 4 dBu 150 ohm channel ON fader at 15 dB source 20 kHz bandwidth Input sensitivity at 50 dBu Output Noise with one line 80 dB below output reference...

Page 13: ...red 520 watts NOTES A These specifications are for the basic signal paths per channel with either or both channels of a stereo pair operating and with 600 ohm loads connected to the program outputs B...

Page 14: ...t manufactured by another shall be warranted only to the extent provided by the other manufacturer C Thermalfilamentdevicessuchaslampsandfusesareexpresslyexcludedfromthiswarranty D The warranty period...

Page 15: ...tor kit which contains all of the Molex connector housings and pins necessary to prepare the audio input output and logic cables as described in Section 2 2 The console is physically installed by sett...

Page 16: ...ive rectifier regulator heat sinks located on opposite sides of the chassis Large heat sinks were chosen over the use of fans to eliminate the problems of dust circulation noise and potential mechanic...

Page 17: ...TE When using the ratchet type Molex Crimping Tool HTR 1719 C PR E 70 5 place a pin into slot B with the long ears on the B of the tool and pointing toward the letter B Place the wire into the tool fr...

Page 18: ...and blank panels will be installed in these positions when no modules are present Any unused optional module positions may be used for the installation of customer designed special purpose panels OPTI...

Page 19: ...he AUXILIARY meters are also used to meter CUE and SOLO signals The built in electret condenser microphone is used as the Control Room source for Slate and Talkback operations NOTE Blank filler panels...

Page 20: ...nd are available for the installation of remote control connectors special purpose panels etc The OPTION connectors labeled A through E on Figure 2 5 are pre wired with 24 pin logic cables which are r...

Page 21: ...12 CONTROL ROOM MONITOR LOGIC PIN ASSIGNMENT Function Pin Number 1 2 3 4 5 6 7 8 9 Logic Common Logic 12 VDC TALKBACK MUTE DIM WARNING TALLY Logic Common DIM Control Room Monitors MUTE Control Room Mo...

Page 22: ...les tied to the station s technical ground If isolated ground receptacles are not available when grounding the BMX III observe the following guidelines A Shields of cables connecting the console to au...

Page 23: ...plicing a longer length to the existing cable Cable lengths up to twenty feet may be fabricated using 14 gauge wire Cables longer than 20 feet are not recommended It is very important to check and dou...

Page 24: ...olex connectors As viewed from the rear of the console the shields are always connected to the left pins the low wires black to the center pins and the high wires red to the right pins While this insp...

Page 25: ...hese are outlined below Control Outputs Tally light Provides a 12 VDC continuous source when activated Pulse Provides a 12 VDC pulse source when activated Sink An open collector that provides a connec...

Page 26: ...on 7 10 8 11 9 12 NOTES A The Patch Send is unbalanced the Patch Return is balanced B The PATCH connector must be wired so that the Patch Send is connected through to the Patch Return If no external p...

Page 27: ...as a Telco hybrid to a Stereo Line Input Module connect the signal to the left input channel and insert jumpers between pins 1 and 4 2 and 5 and 3 and 6 B The Patch Sends are unbalanced the Patch Retu...

Page 28: ...e connected through to the Patch Returns If no external processing or patch bay equipment is connected a mating connector with jumpers from pins 2 to 8 3 to 9 5 to 11 and 6 to 12 must be installed AUD...

Page 29: ...7 AUDIO PIN ASSIGNMENT Signal Connector Shield Low High Input 1 Left Input 1 Right Input 2 Left Input 2 Right Input 3 Left Input 3 Right Input 4 Left Input 4 Right INPUT 1 INPUT 2 INPUT 3 INPUT 4 1 2...

Page 30: ...nitor Module and consists only of the source selected on the 12 station Monitor Input switch However Talkback signals may be assigned to this output reference Section 2 9 3 B The Talkback outputs cons...

Page 31: ...or Output is the direct output of the Two Studio Monitor Module and consists only of the source selected on the 12 station Monitor Input switch B The Talkback Output consists of the respective Talk To...

Page 32: ...SIGNMENT Signal Connector Shield Low High Main Output Auxiliary Output Monaural Meter Source No Connection MAIN OUT MONO SEND METERS AUX OUT 1 2 3 1 2 3 1 2 3 4 5 6 Pin Number Send 1 Meter Source Send...

Page 33: ...Number NOTES A Telco Outputs are routed to the telephone hybrid s B The Fixed and Variable Monitor Outputs consist of only those callers assigned to the Telco Mix System C The Telco Mix Module receiv...

Page 34: ...end 2 ON TALLY Return ON Return OFF Return ON TALLY Return OFF TALLY No Connection No Connection No Connection No Connection No Connection NOTE Consult Section 2 8 5 when connecting Send And Return Mo...

Page 35: ...LK to Studio 1 TALK to Studio 2 TALK to Control Room No Connection No Connection TALK No Connection NOTE Consult Section 2 8 6 when connecting Slate Talkback Test Oscillator Module remote controls AUD...

Page 36: ...2 Right Input 3 Left Input 3 Right Input 4 Left Input 4 Right INPUT 1 INPUT 2 INPUT 3 INPUT 4 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 Pin Number Input 5 Left Input 5 Right INPUT 5 1 2 3 4 5 6...

Page 37: ...Shield Low High Input 1 Left Input 1 Right Input 2 Left Input 2 Right Input 3 Left Input 3 Right Input 4 Left Input 4 Right INPUTS 1 2 INPUTS 3 4 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12...

Page 38: ...INEERING 2 7 13 Timer Control Connection LOGIC PIN ASSIGNMENT Function Pin Number 1 2 3 4 5 HOLD Logic Common RESET START STOP TIMER CONTROL 1 3 2 5 4 1 3 2 5 4 A B 1 3 2 5 4 C NOTE These output comma...

Page 39: ...s which may not exist in a particular installation delete any inappropriate talk buttons The INHIBIT command disables module CUE and SOLO functions for as long as the PRIVACY button is engaged This fa...

Page 40: ...ost or news turret positions and ON OFF CUE and SOLO buttons adjacent to turntables and tape recorders R STOP LAMP R RECORD OR FAST WIND LAMP 1N914 READY 7 AUDIO OFF reset 8 STOP PULSE 11 START PULSE...

Page 41: ...ction of the Control Room Monitor Module Typical applications include equipping the Control Room door with a door open switch or a telephone set with an off hook switch to automatically dim the Contro...

Page 42: ...nto the headphone and monitor circuits Such headphone and or monitor systems are usually provided to co host and news positions in a Control Room The MUTE control output is a current sinking open coll...

Page 43: ...N4001 12 VDC NOTES A Button switches are momentary action B Lamps are 12 14 volt 80 mA C Relay is 12 volt DC 100 mA maximum D When DIM and MUTE tallies are connected as shown above switch lamps will b...

Page 44: ...lkback signal into the headphone and monitor circuits Such headphone and or monitor systems are usually provided to the host and co host positions The MUTE control output is a current sinking open col...

Page 45: ...ich consists of controlling and tallying the ON OFF status of both Send circuits and the Return circuitry LOGIC COMMON 1 10 RETURN OFF TALLY RETURN OFF 8 9 RETURN ON TALLY RETURN ON 7 SEND 2 ON TALLY...

Page 46: ...e Control Room TALK control inputs route the Producer s Microphone Input signal to the selected location The schematic below illustrates the full remote control capability of this input NOTES A Button...

Page 47: ...ity of this input The TALKBACK control output is a current sinking open collector which is active low whenever the external location is receiving Talkback from another location Typical applications in...

Page 48: ...udio 2 ON CLOSED Assign to External ON CLOSED Assign to Control Room 1 2 3 4 5 6 7 8 Input A A A A B B B B 2 9 MODULE INTERNAL OPTION SWITCHES Some BMX III console modules are equipped with PCA mounte...

Page 49: ...h S206 is only found on modules with the Sends option The Sends normally follow the ON OFF status of the module For applications that require continuous Sends such as on or off air telephone contestre...

Page 50: ...Function C1 Down Direct Output follows module ON OFF C2 Up Direct Output continuous S206 Logic Assignment Selector OFF OPEN Sends follow ON OFF ON CLOSED Sends always active with PRE fader selection...

Page 51: ...ir telephone contestrecording thePRE faderSendaudiocantobeset on andavailableatalltimesbyclosingS206 This setting engages the Send relay whenever the PRE button is engaged regardless of the ON OFF sta...

Page 52: ...be dimmed while the Control Room is receiving incoming Talkback communication Note that the Control Room speakers already dim when the Control Room is talking to another location Switch S200 3 allows...

Page 53: ...tting any module into CUE switches the console operator s headphones from the normal stereo source monitor selection to one of two user assigned Auto Cue modes Mode 1 stereo Cue audio is fed to both h...

Page 54: ...m function to block incoming Talkback signals to Studio 1 Closing S202 2 causes the Studio 2 dim function to block incoming Talkback signals to Studio 2 Since the dim function is the result of the stu...

Page 55: ...ers limit the frequency response to the range typically within the null capabilities of professional grade hybrid systems The filters may not be required nor desirable for non hybrid mix minus applica...

Page 56: ...her the Send 2 local and or remote ON OFF buttons are momentary or maintained action When momentary action is selected for the local and or remote ON OFF buttons Send 1 is active only as long as the b...

Page 57: ...ck Test Oscillator Module has one internal option switch which sets the External Talk audio input to be either microphone or line level The illustration below provides the location of this switch and...

Page 58: ...ter Switcher Module has one internal option switch which sets the priority of the AUXILIARY meter display between CUE and SOLO The illustration provides the location of this switch and defines its fun...

Page 59: ...solution control with a reference line at the 15 dB point The reference is the nominal position for a properly adjusted input level to achieve 0 VU on the console output meters The electronic alternat...

Page 60: ...he stereo sound field The mixing fader is a stepless infinite resolution control with a reference line at the 15 dB point The reference is the nominal position for a properly adjusted input level to a...

Page 61: ...nnels RIGHT Right input is routed to both output channels SUM Left and right inputs are summed to both output channels The mixing fader is a stepless infinite resolution control with a reference line...

Page 62: ...ld The INPUT MODE selector determines the module mode as follows STEREO Discrete stereo channels LEFT Left input is routed to both output channels RIGHT Right input is routed to both output channels S...

Page 63: ...PACIFIC RESEARCH ENGINEERING 3 5 STEREO LINE OUTPUT AMPLIFIER LEFT GAIN TRIM RIGHT The recessed LEFT and RIGHT GAIN TRIM controls set the gain of the line output distribution amplifiers These control...

Page 64: ...ly when the Control Room is muted CUE controls the level of the Control Room Cue output INPUT MODE sets the module s monitor and headphone outputs as follows STEREO Discrete stereo is output LEFT The...

Page 65: ...controls the level of Talkback communications received in Studio 1 TALK OVER MUTE is an alternate action switch which when engaged down allows communication to Studio 1 even when there is a live micr...

Page 66: ...rce Selection for the Mono Main and Aux Outputs and the gain trim for these outputs The recessed GAIN TRIM control sets the gain of the monaural line output distribution amplifier This control is for...

Page 67: ...lity UTL bus is normally assigned as the base mix bus for Telco operations by configuring the console as follows 1 Assign all Input modules to be included in the base mix to the UTL bus Do Not assign...

Page 68: ...djust the two Send levels The OUTPUT buttons assign the stereo Return audio to any combination of the PROGRAM AUDITION and UTILITY output buses PAN controls when the INsert switch is down the left rig...

Page 69: ...0 0 MIX SOLO ON RETURN 1 2 MONO SOURCE GAIN TRIM PGM UTL AUD PGM AUD UTL SEND TO TELCO INPUT MONITOR TELCO 2 TELCO 1 0 0 0 TELCO MIX This optional multi function module combines the independent funct...

Page 70: ...EXTERNAL INPUT sets the level of the External Talkback Input PRODUCER MIC sets the gain of the Producer Input preamplifier CONSOLE MIC sets the gain of the meter panel electret microphone SLATE LEVEL...

Page 71: ...the Meter inputs are used to meter the Utility UTL and Audition AUD buses On the 18 and 22 input mainframes Input 5 the bottom input selects UTL metering On the smaller 10 and 14 input mainframes the...

Page 72: ...stalled in the BMX III mainframe The ten Remote Inputs are common between the two RLS modules A ten station switchbank selects one input source from among the ten Remote Inputs The stereo output from...

Page 73: ...nates to tally its ON status When AUTO is disengaged button up tally off the Timer is manually controlled through the panel buttons RESET resets the timer to zero 00 00 0 If the timer is already runni...

Page 74: ...nic components in the mainframe are the VU meter power regulator assembly and the meter buffer amplifiers These are described in detail in Sections 4 14 and 4 15 respectively The meter buffer amplifie...

Page 75: ...xcept for the presence or absence of the Send circuitry the two Microphone Input Modules function identically The additional Send circuitry is described at the end of the audio and logic circuit descr...

Page 76: ...e high provided by the flip flop will give a high output to the tally lamp and audio relay drive circuits U213A Q229 and U216B Q228 The input to U216B is delayed with a 40 millisecond network consisti...

Page 77: ...down the Control Room mute bus to prevent feedback The change of state is also routed to network C219 and R220 through U209B to reset CUE bistable U210A if the CUE function was engaged The low at pin...

Page 78: ...s are located in Chapter 7 4 3 1 Function Both Stereo Line Input Modules will accommodate nominal input levels from 12 dBu to 8 dBu The A B input selector allows for the selection of either of two ste...

Page 79: ...ct on the A B input selector switch is routed to integrated circuit switches U206 U200 U212 and U201 U206 selects the A B logic status of the module as determined by programming switches S200 U200 the...

Page 80: ...UE tally output switch U201 Pressing the module or the selected input s remote control SOLO button causes a high to appear at the output of U202C which is connected to U210B Circuit U210B is connected...

Page 81: ...locking monitor selector The module consists of five sections monitor SOLO CUE Talkback and headphone Each section has a relationship with the others that can be best appreciated by reviewing the modu...

Page 82: ...this stage may be increased to 6 dB with the installation of R61 and C44 as shown in the schematic LOGIC The Control Room monitor system may be muted by a low applied to the MUTE CR logic bus or by a...

Page 83: ...Talkback to Studio circuits Each section of each Studio s monitor circuitry has a relationship with the others which can best be appreciated by reviewing the module block diagram located in Chapter 7...

Page 84: ...EMOTE MUTE COMMAND transistor Q200 through inverter U203E to warning lamp driver circuit Q202 and Q203 and to front panel TALK OVER MUTE switch S200 The Studio 1 monitor system may be dimmed by a low...

Page 85: ...switchable filters for improved hybrid operation reference Section 2 9 5 NOTE In order to assign a caller to the PROGRAM AUDITION and or UTILITY output buses such as the PROGRAM bus for on air Telco...

Page 86: ...bus signal is summed and inverted by amplifiers U101A and U101B which are operating at unity gain The output of U101B is routed through Send on off relay K100 and the front panel SEND 1 master fader...

Page 87: ...ts of circuitry For clarity and simplicity only the left channel is described below The input signal is buffered by balanced differential amplifier U300B operating with a gain of 8 dB The output of U3...

Page 88: ...cribed in Section 4 7 the Telco Mix section is described in Section 4 8 and the Send And Return section is described in Section 4 9 4 11 SLATE TALKBACK TEST OSCILLATOR MODULE 4 11 1 Function The Slate...

Page 89: ...or switches slate relay K7 on Therefore when the slate tone is requested K7 immediately switches on and 200 milliseconds later the output of the bandpass filter builds up and provides tone into the sl...

Page 90: ...or Positive feedback around this amplifier is via the frequency determining network The output of U10 is applied to the top end of the network and the midpoint of the network is fed back to the non in...

Page 91: ...of about 0 05 at 20 kHz When the test oscillator is not selected it is muted by injecting a voltage into the AGC loop at R71 to cancel oscillation The output of the oscillator is connected through th...

Page 92: ...ng Q3 to pull down the Talk to STUDIO 1 logic control bus The high output of U15F is also routed through delay circuit R131 C103 and U19D to Talk to Studio 1 relay K3B which routes the Talkback signal...

Page 93: ...o to the Talk to External audio bus Any signals on that bus are summed and inverted by amplifiers U6B and U6A These amplifiers provide a balanced push pull output to the TALK TO EXTERNAL terminals The...

Page 94: ...by R19 These amplifiers along with their unity gain inverters U1B and U2B provide balanced outputs through the meter relay to the AUXILIARY meters 4 13 REMOTE LINE SELECTOR 4 13 1 Function The Remote...

Page 95: ...ules a bipolar 22 volt audio supply a 12 volt logic supply and a 48 volt phantom supply Each module has its own magnetic circuit breaker power transformer and regulator circuitry Color coded voltage t...

Page 96: ...ntheleftsideofthepowersupply as viewed from the front NOTE The regulator heat sink assemblies used for the audio and logic supplies are each capable of delivering up to 10 amps of current to the BMX I...

Page 97: ...rence the schematic located in Chapter 7 for more information 5 2 OUTPUT LEVEL CONVERSION 4 dBu to 8 dBu All consoles are set for a 4 dBu output level at the time of factory test unless a 8 dBu level...

Page 98: ...mplifiers are located on the module PC assembly R5 and R19 and are accessible by removing the adjacent modules or by using an extender board Apply a 1 kHz test signal at 10 dBu to the left and right P...

Page 99: ...tally of the Stereo Line Input Module being used as a Telco input When the input module is turned ON the caller is placed on air and is fed the Telco output When the module is turned OFF the caller is...

Page 100: ...connect Telco Outputs 1 and 2 and the Send 1 and Send 2 outputs to the two telephone hybrids as shown in Figure 5 2 on the following page Once this has been accomplished assign signal sources to the...

Page 101: ...ole operator s headphones the CUE buttons will reset when the module is turned ON When connecting an external speaker use a relay driven by the Control Room Warning Tally so that the speaker will mute...

Page 102: ...and its circuitry are described below INSTALLATION The Talkback Intercom module is installed in the mainframe position reserved for the Two Studio Monitor module see Figure 2 3 page 10 and uses the ST...

Page 103: ...KBACK MUTE DIM WARNING TALLY Logic Common TALK to Control Room TALKBACK w Mute 1 9 8 7 6 5 4 3 2 LOGIC The schematic below illustrates the full remote control capability of each Studio DIM 5 4 MUTE TA...

Page 104: ...muted NOTE The TALKBACK WITH MUTE output will function identically to the TALKBACK output by cutting the jumpers between points E1 and E2 for Studio 1 and E3 and E4 for Studio 2 on the Talkback Interc...

Page 105: ...this NOR gate is inverted to drive TALK TO CONTROL ROOM bus switch Q14 These logic functions allow received Studio 1 Talk to connect to the console TALK TO CONTROL ROOM bus The five external commands...

Page 106: ...hould be within 0 5 volts of its specified DC voltage The outputs should also be checked periodically for ripple and noise using a sensitive AC voltmeter The reading should be less than 350 microvolts...

Page 107: ...y take considerable force to remove the button so exercise caution Carefully snap the replacement button onto the switch shaft 6 1 4 Collet Knob Removal The knobs used for the console s rotary control...

Page 108: ...alog and logic components are socketed for ease of replacement WARNING The CMOS logic devices are susceptible to destruction from static discharge while being handled It is recommended that considerab...

Page 109: ...AMPLIFIER CALIBRATION The gain trim control for each VU meter buffer amplifier is located on the buffer amplifier PC assembly PROGRAM AUDITION and UTILITY meters Apply a 1 kHz test signal at 10 dBu 6...

Page 110: ...5 SPARE PARTS KIT The following Spare Parts Kit PR E 76 21 is supplied with each console This kit is excluded from the limited warranty and is provided to support initial installation only DESCRIPTION...

Page 111: ...24 PNP MJE171 2 8 1 PNP MPSA63 2 8 4 PNP MPSU95 2 8 6 PNP 2N3638A 2 8 8 PNP MPS2907 2 8 16 Voltage Regulators Variable 1 5A Pos LM317T 1 20 49 Variable 1 5A Neg LM337T 1 20 59 Variable 5A LM338K 1 20...

Page 112: ...PR E Blank Panels 6 inch 99 209 10 inch 99 271 16 inch 99 259 Buttons Rectangular White 25 771 Rectangular White PRE 25 771 1 Rectangular White OSC 25 771 5 Rectangular White 100 25 771 6 Rectangular...

Page 113: ...0 F 25V NP 60 87 Electrolytic 100 F 63V 60 53 Electrolytic 220 F 16V 60 44 Electrolytic 220 F 16V NP 60 83 Electrolytic 220 F 25V 60 78 Electrolytic 470 F 80V 60 40 Electrolytic 16 000 F at 50WVDC 60...

Page 114: ...119 990 95 120 Heatsinks For TO 220 PC Mount 31 6 12V Power Supply 80 508 With Two Mating Positions 80 202 3 Heatsink Assemblies Dual Regulator Power Supply 90 338 Single Regulator Power Supply 90 33...

Page 115: ...for 11 mm knob 32 124 Green for 11 mm knob 32 122 Orange for 11 mm knob 32 127 Orange for 21 mm knob 32 140 Red for 21 mm knob 32 139 Lamps 12V 0 7W bi pin 1099BPE for CUE and SOLO 12 46 14V 08A 658 f...

Page 116: ...24 108 Single 10K CW Log 24 98 Power Supply Assembly 120 Volts 99 238A PPM Meter 3 5 with Buffer Amplifier 99 224 1 Regulator Board PCAs 12V Power Supply 95 89 22V Power Supply 95 91 Relays DPDT 12 vo...

Page 117: ...7 21 NPN 80V 0 5A MPSA06 7 24 NPN 100V 2A TIP112 7 23 NPN LM394H 10 2 PNP MPSA63 8 4 PNP MPSU95 8 6 PNP PN3638A 8 8 PNP PN4250A 8 12 PNP MPS 2907 8 16 Transistor Diode Assemblies MJE171 1N914B 90 119...

Page 118: ...Input Module Schematic 7 5 Stereo Line Input Module With Sends Schematic 7 6 Stereo Line Output Amplifier Schematic 7 7 Control Room Monitor Module Schematic 7 8 Two Studio Monitor Module Schematic 7...

Page 119: ...oom Monitor Module 7 27 9 Two Studio Monitor Module 7 27 10 Monaural Amplifier Output 7 27 11 Telco Mix 7 27 12 Send And Return 7 27 13 Slate Talkback Test Oscillator Audio 7 27 14 Slate Talkback Test...

Page 120: ...atedremotecontrol Y cablesformostcommercialcartandtapemachines are available from PR E 8 1 1 Cart Recorder Remote Control Panel Thecartrecorderremotecontrolpanel PR E 99 240 cancontroltherecord tertia...

Page 121: ...as shown in Figure 8 1 Toadjusttheclock placetheendoftheadjustingmagnetagainstthepanelintheappropriatearea Usethe FAST SET switch to advance the hours and the SLOW SET switch to advance the minutes T...

Page 122: ...danarrowpulse 65microseconds representsabinary zero The data rate is 60 Hz Demodulation is accomplished using shift registers U3 U4 and U5 The incoming data is buffered by transistor Q2 and gate U1 be...

Page 123: ...1throughQ7 whilethedigitsareselectedbytransistorsQ8through Q12 Power up circuit R13 CR1 and C9 resets U4 to zero and sets start stop flip flop U2A and U2C so that theNOTRUNlineishigh AnexternalSTARTco...

Page 124: ...dantPowerSupplyCouplerUnit PR E 99 76 isusedwheneverredundantpowerisdesired When two power supplies are connected to the unit the power supply voltages are diode coupled with thehighestofthetwovoltage...

Page 125: ...r 99 165 99 125 0 99 125 1 99 111 99 110 99 143 99 419 99 410 Cassette recorders General purpose switching mute contacts Studio and Control Room warning lights Turntables Reel to reel tape machines w...

Page 126: ...9 38 or 99 464 for TI 2 I F 99 453 9 pin or 99 454 12 pin for TI 2 Machine Y Cable Cart Tape or Cassette Recorder 99 455 Optional Remote Control Panel or 99 465 for Studer A725 A727 and A730 CD Player...

Page 127: ...llyispresentatcartconnectorJ4 currentflowsthroughU1 sLED turningonitsoutputtransistor andpullingtheAUDIORESETlinetoconsoleLOGICCOMMON When the STOP LIGHT tally is present at cart connector J4 U2 will...

Page 128: ...pulseinputviaCR1willturnonrelayK1 startingthecartridgemachine CurrentfedtoisolatorcircuitCR5 8 R1 R3 C1 and U1 will force the NOT AUDIO RESET line low A STOP pulse input via CR2 will turn on relay K2...

Page 129: ...Without a cartridge loaded the CART line is low which via U5B and U5C presets U6B such that the NOT START ENABLE line is low After insertion of a cartridge CART line is high a start pulse input will...

Page 130: ...the zero crossing point of the AC source to minimize noise transients 8 5 7 Dual Relay Interface TheDualRelayInterface PR E 99 419 consistsoftwoseparatelycontrolledrelays whichcanbeused for audio or c...

Page 131: ...rough CR9 and R3 When ON TALLY voltage is removed C5 is discharged slowly through R2 and R1 Schmidt inverter squares up and inverts this signal and sends it to monostables that generate the PLAY and P...

Page 132: ...2A Cartridge Interface 8 6 10 CI 2CartridgeInterface 8 6 11 TI 2 Tape Interface 8 6 12 TT 3TurntableInterface 8 6 13 WL 2 Warning Light Interface 8 6 14 Dual Relay Interface 8 6 15 CassetteSkimmerInt...

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Pacific Research BMX-III-18, Operation And Technical Manual, Page: 114 / 132

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Summary of Contents for BMX-III-18

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