DI-box circuits ( 62 ) :

DI-box is an electronic device for helping to interface electronic music instruments (like electric guitar and syntetizer) to mixing desks.
 

• General information

• A Direct Box can be inDIspensible - DI-box converts high impedance signal to a low impedance and converts unbalanced signal to balanced   
   

• Transformer isolated DI box designs

• AV-1 Tech Sheet (Direct box) - DI-box product datasheet which includes full circuit diagram, has line level and speaker level inputs, pdf file   
• AV-1PV Tech Sheet - DI-box with line level and speaker level inputs, with input volume control, data sheet with circuit diagram, pdf file   
• CB-1 Direct Box - unixersal DI-box product which works with guitar and keyboards, product datasheet with circuit diagram in pdf format   
• DB-1 Direct Box - DI-box with instrument and speaker level inputs, product datasheet with circuit diagram in pdf format   
• DB-4 Direct Box - four channel DI-box with keyboard or dum machnine inputs, product datasheet with circuit diagram in pdf format   
• Direct Injection Box for Recording & PA Systems - passive and active DI-box designs   
• Jensen Direct Box Transformers - data sheets have example circuit diagrams   
• JT-DB-E Standard Musical Instrument or Synthesizer "Direct Box"   
• JT-10KB-D Isolates and Converts Speaker Drive to Line Level   
• JT-11-FL provides Isolated Line Output from Guitar Amplifier   
• JT-11-FL Isolates & Converts Guitar Amp Speaker Out to Line Output   
• JT-11P-1 Conversion of Unbalanced Input to Balanced   
• JT-DB-E Full-featured "Direct Box" Application Schematic   
• JT-DB-E "Direct Box" for Very High Level Signals - takes high level line signal and outputs balanced microphone level signal   
• JT-DB-E Standard Musical Instrument or Synthesizer "Direct Box"   
• Tillverka din egen DI-box - This document tells you how to build a transformer isolated DI box. The text in this document is in Swedish.   
   

• Active Di box designs

• Direct Injection Box for Recording & PA Systems - passive and active DI-box designs   
• Electric Crayons, Anyone? (A Vacuum Tube Microphone Preamp / Direct Box Project) - published in January97 EQ Column   
• Mike Pads and Other Small Gadgets - includes Active Direct Box circuit   
• JT-11B-1 + "Phantom" Buffer Provide Balanced Guitar Output   
   

• Signal splitters

• JT-11P-1 in 4-Way Active "Guitar Splitter" - from one guitar to up to 4 guitar amplifiers  
• JT-10B-D Used in Line Level 2-Way Splitter/Isolator - active line level splitter circuit with input and output isolation   
• JT-11P-1 in 2-Way Passive "Guitar Splitter" - from one guitar to two guitar amplifiers   
• MS-2 Mic Splitter - send signal from one microphone to two mixers, product datasheet with circuit diagram in pdf format   
• MS-82P Microphone Splitter with Phantom Power Buss - 8 channel microphone splitter which can inject phantom power to microphone, product datasheet with circuit diagram in pdf format   
• Theory and Construction of Mic "Splitters" - 5 page booklet in pdf format   
• Transformer Coupled Splitter - active amplified transformer isolated signal splitter that enables hum-free connection of one guitar to more than one amp as well as having a direct output   
   

• Signal isolation boxes

• IT-1 Inline 600/600 ohm line transformer - audio signal isolation transformer, product datasheet with circuit diagram in pdf format   
• IT-4 four channel isolation transformer unit - audio signal isolation transformer, product datasheet with circuit diagram in pdf format   
• JT-11-DM Basic Hum Stopper Transformer isolation box - simple isolator for 600 ohm balanced audio lines   
• JT-11P-1 Unbalanced Automotive or Consumer Application - isolation transformer box for unbalanced consumer audio line signals   
• JT-11P-1 Conversion of Unbalanced Input to Balanced   
• JS-11SSP-6M 150 ohm line to 600 ohm load application - isolation transformer with impednace conversion    Rate this link
• JT-11SSP-6M 600 Ohm Line Isolation Application - isolation transformer for 600 ohm balanced audio line   
• JS-11SPP-6M 600 ohm line isolator with line termination switch - for used with long 600 ohm lines which need termination   
• JT-11SSP-6M Universal Patchbay Isolation Application - for use with professional low impedance sources and high impedance loads   
   

• Signal combining

• Dual JT-MB-C Microphone Combining Circuit - connect two microphones to one microphone input   
• JT-11SSP-6M Passive Stereo Matrix for M-S Mic Technique   
• MC-2 Microphone Combiner - product datasheet with circuit diagram in pdf format   
• Simple line mixer - mix two line level sources to one signal, includes separate volume controls for both signals, passive circuit   
• Simple two line output combiner - convert consumer equipment stereo signal to mono or combine audio signal from two different equipments to one input   
• Stereo to Mono Combiner for Balanced Systems   
   

• Conversion between professional and consumer equipments

• Interconnection of Balanced and Unbalanced Equipment - 4 page booklet in pdf format   
• JT-10KB-D & JT-DB-E Provide "J-Box" Consumer to Studio Interfaces - from -10dBV unbalanced to 150 ohm balanced microphone level (-45dBu) signal and from +4dBu balanced signal to -10dBV unbalanced signal   
• JT-10KB-D & JT-6110K-B "Pro" to "Consumer" Interfaces - from +4dBu balanced output to -10dbV consumer equipment input   
   

• Other related circuits

• Audio Transformer: The Ultimate Noise Killers - application note article on audio transformers   
• Grounding and Shielding - describes basic audio transformer uses like balanced in/out and signal splitters   
• Internal Modification to Mic Inputs of the Mackie 1604 Mixer Eliminates RFI Problems - adding transformer isolation increases common mode rejection and eliminates RF interference, pdf document   
• Jensen Transformers Application Schematics   
• JT-11P-1 as "Phase Splitter" with Symmetrical Outputs   
• JT-10KB-D Isolates and Converts Speaker Drive to Line Level   
• JT-11P-1 used as Unbalanced Polarity Inverter   
• JT-11-DM Converts Unbalanced Output to Balanced   
• JT-11SSP-6M Bi-directional Lo-Z Long Line Application - this circuit isolated and impedance matches under 100 ohm source to long cable line and that to over 10 kohm input   
• JT-6110K-B Isolates "70 Volt" Line and Converts to Line Level   
• JT-DB-E Converts Consumer Stereo Inputs to Mono Balanced Mic Output   
• JT-MB-C Isolates both Mic and Line Inputs of Inexpensive Mixer   
• JT-MB-C "Real" Mic Inputs & Phantom Power for Sony DAT   
• JT-MB-C Mic Input Isolation for Mackie Mixers    Rate this link
• JT-MB-D Converts 600 Ohm Unbalanced Mic to 150 Ohm Balanced Mic Line   
• Mixed feedback drive circuits for audio output transformers - technical paper from   

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