Everything you wanted to know about wideband,
low-frequency transformers:
EDN-Design Ideas / PDF contains multiple
circuits - scroll to find this circuit.
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External Isolation Transformer Box: designed for
Mackie and other Mixers Eliminates RFI Problems
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Grounding & Shielding: describes basic audio
transformer uses like balanced in/out and signal
splitters |
High CMRR Balanced Interface: Uses for Crystal18
or20 Bit A/D Converters. This is a PDF file
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High Output Line Driver for Single Ended Power
Supply: PDF file |
IC Mic Preamp uses Jensen Twin Servo topology:
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Interconnection of Balanced & Unbalanced Equipment:
4 page booklet in PDF format |
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 |
Isolation Transformer Passes millihertz Signals:
EDN-Design Ideas
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IT 4 Four Channel Isolation Transformer unit:
audio signal isolation transformer, product
datasheet with circuit diagram in PDF format
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IT one inline 600 / 600 Ohm Line Transformer:
audio signal isolation transformer, product
datasheet with circuit diagram in PDF format |
Jensen Direct Box Transformers: data sheets have
example circuit diagrams |
Jensen Transformers Application Schematics:
includes many microphone preamplifier related
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JP 11P 1 Input Transformer Improvement for
Electronically balanced Input:
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JS 11SPP 6M 600 Ohm Line Isolator with Line
termination Switch: for used with long 600 ohm
lines that need termination |
JS 11SSP 6M 150 Ohm Line to 600 Ohm Load application:
isolation transformer with impedance conversion
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JT 10B D Used in Line Level 2 Way Splitter /
Isolator: active line level splitter circuit
with input and output isolation
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JT 10KB D & JT 6110K B "Pro" to "Consumer"
Interfaces: from +4dBu balanced output to -10dbV
consumer equipment input |
JT 10KB D & JT DB E Provide "J Box" Consumer to
Studio Interfaces: from -10dBV unbalanced to150
ohm balanced microphone level -45dBu signal and from
+4dBu balanced signal to -10dBV unbalanced signal |
JT 10KB D Isolates & Converts Speaker Drive to Line
Level: |
JT 11 BM High Level Differential IC Output Stage
with DC Servo: |
JT 11 BM High Level High Current Differential Output
Stage with DC Servo: |
JT 11 DM Basic Hum Stopper Transformer Isolation Box:
simple isolator for 600 ohm balanced audio lines
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JT 11 DM Converts Unbalanced Output to Balanced:
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JT 11 FL Isolates & Converts Guitar Amp Speaker Out
to Line Output: |
JT 11 FL provides Isolated Line Output from Guitar
Amplifier: |
JT 11 YZPC in Unbalanced Long Line Driver / Isolator:
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JT 11B 1 + "Phantom" Buffer Provide Balanced Guitar
Output: |
JT 11P 1 as "Phase Splitter" with Symmetrical
Outputs: |
JT 11P 1 Balanced Tube Line Input Stage:
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JT 11P 1 Conversion of Unbalanced Input to Balanced:
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JT 11P 1 in 2 Way Passive "Guitar Splitter":
from one guitar to2- guitar amplifiers
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JT 11P 1 in 4 Way Active "Guitar Splitter": from
one guitar to up to4 guitar amplifiers
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JT 11P 1 Unbalanced Automotive or Consumer
Application: isolation transformer box for
unbalanced consumer audio line signals |
JT 11P 1 used as Unbalanced Polarity Inverter:
passive transformer based audio signal inverter
circuit |
JT 11SSP 6M 600 Ohm Line Isolation Application:
isolation transformer for 600 ohm balanced audio
line |
JT 11SSP 6M as Input Transformer for Crystal CS5367
A / D Converter: transformer balanced passive
input circuit for CS5367 A/D converter, PDF file |
JT 11SSP 6M Bi-Directional Lo Z Long Line
Application: this circuit isolated and impedance
matches less than100 ohm source to long cable line
and that to over10 kohm input |
JT 11SSP 6M Passive Stereo Matrix for M S Mic
Technique: |
JT 11SSP 6M Universal Patchbay Isolation Application:
for use with professional low impedance sources and
high impedance loads |
JT 123 BL High Level Low Impedance Differential
Output Stage with DC Servo: |
JT 123 S Line Driver with Feedback Around the
Transformer: |
JT 13K6 C in Simple 1 IC Stage Mic Preamp: 15KB
PDF |
JT 16 A Improves Performance of SSM2017 Mic Preamp
IC: |
JT 6110K B at Input Stage for Crystal a to D
Converters: high performance transformer
balanced input stage for Crystal A/D converters, PDF
file |
JT 6110K B Isolates "70 Volt" Line & Converts to
Line Level: |
JT DB E "Direct Box" for very High Level Signals:
takes high level line signal and outputs balanced
microphone level signal |
JT DB E Converts Consumer Stereo Inputs to Mono
Balanced Mic Output: |
JT DB E Full featured "Direct Box" Application
Schematic: |
JT DB E Standard Musical instrument or Synthesizer
"Direct Box": |
JT MB C "Real" Mic Inputs & Phantom Power for Sony
DAT: |
JT MB C in Low Noise, High Isolation Line Receiver
for Low Z Sources: |
JT MB C Isolates both Mic & Line Inputs of
inexpensive Mixer: |
JT MB C Mic Input Isolation for Mackie Mixers:
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JT MB C Used to "Phantom" Power the Realistic PZM
Mic: |
JT MB D Converts 600 Ohm Unbalanced Mic to 150 Ohm
Balanced Mic Line: |
JT MB D Passive Stereo Matrix for M S Mic Technique:
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Method sets voltage in multiple-output converters:
EDN-Design Ideas / PDF contains multiple circuits
- scroll to find this circuit. |
Mixed Feedback Drive for Audio Output Transformers:
Technical paper from Lundahl Transformers in PDF
format |
Power Supplies & Transformers: Basic structures
of power supplies |
Power Supplies and Regulators: new low power
discrete switcher |
Step Down Rectifier makes a Simple DC Power Supply:
04/09/98 EDN-Design Ideas - A simple and
useful nonisolated rectifier features voltage
step-down operation, acceptable Class A line-current
harmonics, inherent short-circuit protection, and,
optionally, a regulated output
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Theory & Construction of Mic "Splitters": 5 page
booklet in PDF format |
Transformer Coupled Splitter: Active amplified
transformer isolated signal splitter that enables
hum-free connection of1-guitar to more than1-amp as
well as having a direct output
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Transformers for Audio Interfacing: Discussion
on using audio transformers in equipment
interconnections, read also Line-level transformers
in High-End Audio |