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Mic Preamp  |  Line Input  |  Line output  |  General Interface  |  Musical Instrument  |  Equipment Upgrade  |  Miscellaneous

Mic Preamp Application Schematics

App #	Title
AS016	Standard Microphone Preamp Input Circuitry
AS017	JT-13K6-C in Simple One IC Stage Mic Preamp
AS018	JT-16-A in Single Stage Low-Noise IC Mic Preamp
AS019	JT-16-A in Single Stage Mic Preamp with Two DC Servos
AS020	JT-115K-E Tube Microphone Preamp Generic Input Stage
AS047	Two JT-115K-E used in Symmetrical Mic Input Stage
AS049	JT-MB-D Converts 600 Ohm Unbal. Mic to 150 Ohm Balanced Mic Line
AS054	JT-115K-E Cascode Tube Microphone Input Stage
AS055	JT-MB-D Passive Stereo Matrix for M-S Mic Technique
AS082	IC Mic Preamp uses Jensen Twin-Servo Circuit Topology
AS083	Famous Twin-Servo 990 Mic Preamp Basic Circuit

Line Input Application Schematics

App #	Title
AS005	JT-11P-1 Receiver for Very Long Line Applications
AS035	JT-MB-C in Low Noise, High Isolation Line Receiver for Low-Z Sources
AS060	JT-11P-1 as “Phase Splitter” with Symmetrical Outputs
AS072	Additional RFI Protection for Line Input Circuits
AS087	JT-11P-1 Generic Tube Line Input Stage
AS088	JT-11P-1 Balanced Tube Line Input Stage
AS089	JT-11P-1 Balanced XLR Input to Unbalanced RCA Output

Line Output Application Schematics

App #	Title
AS021	JT-10K61-1M Line Driver uses Push-Pull Vacuum Tube “Cascode Follower”
AS022	Simple 0 to 24 dB Gain Amplifier and Balanced Line Driver
AS023	20 dB Amplifier and High Current Balanced Line Driver
AS024	12 dB Amplifier and High Current Line Driver with DC Servo
AS025	JT-123-S Line Driver with Feedback Around the Transformer
AS026	JT-11-BM + JT-990-C = Ultra-High Performance Output Stage
AS027	JT-10KB-D + JT-990-C + JT-11-BM = Ultra-High Performance Line Driver
AS029	JT-10KB-D + JT-990-C + JT-123-BL = 50 Ohm Long Line Driver
AS030	JT-11-BM High Level Differential IC Output Stage with DC Servo
AS031	JT-11-BM High Level High Current Differential Output Stage with DC Servo
AS033	Low Noise version of High Level Output Stage in 1031
AS034	JT-123-BL High Level Low Impedance Differential Output Stage with DC Servo
AS051	JT-123-S Differential Line Driver with Feedback Around the Transformer
AS056	JT-11-YZPC in Unbalanced Long Line Driver/Isolator
AS079	High Output Line Driver for Single Ended Power Supply

General Interface Application Schematics

App #	Title
AS001	JT-11P-1 Unbalanced Automotive or Consumer Application
AS002	JT-11P-1 Conversion of Unbalanced Input to Balanced
AS003	JT-11P-1 Upgrade of “Active Balanced” Input to Transformer Balanced
AS008	JT-DB-E “Direct Box” for Very High Level Signals
AS009	JT-11SSP-6M Low-Z Line Isolator with Termination Switch
AS010	JT-11SSP-6M 600 Ohm Line Isolation Application
AS011	JT-11SSP-6M 150 Ohm Line to 600 Ohm Load Application
AS012	JT-10KB-D & JT-6110K-B “Pro” to “Consumer” Interfaces
AS036	JT-11-DM Basic “Hum Stopper” Transformer Isolation Box
AS041	JT-10KB-D used in Line Level 2-Way “Splitter/Isolator”
AS042	JT-11P-1 used as Unbalanced Polarity Inverter
AS046	JT-11SSP-6M Universal Patchbay Isolation Application
AS052	JT-11-DM Converts Unbalanced Output to Balanced
AS053	Dual JT-MB-C Microphone Combining Circuit
AS059	JT-6110K-B Isolates “70 Volt” Line and Converts to Line Level
AS065	JT-11SSP-6M Passive Stereo Matrix for M-S Mic Technique
AS068	JT-10KB-D Isolates and Converts Speaker Drive to Line Level
AS077	JT-11SSP-6M Bi-directional Lo-Z Long Line Application
AS080	Stereo to Mono Combiner for Balanced Systems
AS078	JT-DB-E Converts Consumer Stereo Inputs to Mono Balanced Mic Output
AS081	JT-10KB-D & JT-DB-E Provide “J-Box” Consumer to Studio Interfaces
AS090	JT-6110K-B Converts High Impedance Input to X10 Balanced Audio Input
AS094	JT-11SSP-6M in Wheatstone Bridge Stereo to Mono Combiner Circuit
AS096	JT-DB-E in Ham Radio Line Level to Mic Level Circuit
AS101	“Alway On” Signal Sensing Subwoofer Mute Circuit

Musical Instrument Application Schematics

App #	Title
AS004	JT-11P-1 Isolates “Phantom Powered” Guitar or Instrument Buffer
AS007	JT-DB-E Standard Musical Instrument or Synthesizer “Direct Box”
AS013	JT-11P-1 in 2-Way Passive “Guitar Splitter”
AS045	JT-11-FL provides Isolated Line Output from Guitar Amplifier
AS061	JT-11-FL Isolates & Converts Guitar Amp Speaker Out to Line Output
AS066	JT-DB-E Full-featured “Direct Box” Application Schematic
AS092	JT-11P-1 Balanced Line Level to Unbalanced Guitar Level
AS098	JT-DB-E and JT-11P-1 in Piezo Pickup Amplifier Circuit

Equipment Upgrade Application Schematics

App #	Title
AS006	JT-11P-1 Input to Ultra-Analog 20 Bit A/D Converter
AS015	JT-MB-C Isolates both Mic and Line Inputs of Inexpensive Mixer
AS037	JT-MB-C “Real” Mic Inputs & Phantom Power for Sony DAT
AS039	JT-115K-E90 “Sync” Conversion for Magna-Tech 69C Repro Amplifier
AS043	JT-6110K-B at Input Stage for Crystal A to D Converters
AS057	JT-MB-C Mic Input Isolation for Mackie Mixers
AS058	JT-MB-C Modification for Mic Inputs of Mackie 1604 Mixer
AS062	High CMRR Balanced Interface for Crystal 18 or 20 Bit A/D Converters
AS063	JT-16-A Improves Performance of SSM2015 Mic Preamp IC
AS064	JT-16-A Improves Performance of SSM2017 Mic Preamp IC
AS069	JT-11P-1 Improves CMRR of “Electronically Balanced” Line Inputs
AS070	JT-MB-C Used to “Phantom” Power the Realistic PZM Mic
AS073	External Isolation Transformer Box for Mackie (and other) Mixers Eliminates RFI Problems
AS074	Internal Modification to Mic Inputs of the Mackie 1604 Mixer Eliminates RFI Problems
AS075	Balanced Line Inputs/Outputs for Silicon Graphics Workstations
AS076	Using the JT-16-A with “The Country Boy’s Capacitor Microphone”
AS086	JT-11SSP-6M as Input Transformer for Crystal CS5367 A/D Converter
AS091	JT-11P-1 / JT-10K61-1M Teletronix LA2A Circuitry Modifications

Miscellaneous Application Schematics

App #	Title
AS032	Build the “Hummer” to Find “Pin 1 Problems” in Equipment
AS038	Phantom Power Battery Test Circuit
AS040	Calculating Transformer Related Noise Figure
AS044	Stereo Headphone Driver uses LM6325 Current Booster
AS048	Simplified Measurement of Output Impedance
AS050	High Performance Audio Op-Amp Quick Reference
AS071	“Anti-RIAA” Equalizer for Line to Mag Phono Converter
AS085	Proper Grounding Inside Equipment Avoids Ground Noise Coupling (aka “Pin 1 Problems”)