Samuel Groner

    Zürich, Switzerland
  • Posts: 2935
META - Microphone Preamplifiers
« on: October 08, 2005, 02:52:33 AM »
META - Microphone Preamplifiers

This is a meta-thread, made to allow you to keep track of the posts concerning this single issue. All should be contained in this first post - which is re-edited regularily. Everyone is welcome to reply with comments and pointers to things they consider relevant. This will be copy/pasted into the first post, if the meta-keeper finds it relevant. (We deeply dislike censorship, but here it seems necessary for the sake of overview). On a regular basis, a moderator will delete all posts but this first one, and bump the thread to the top.

Transformerless Input:

IC Based Designs:
www.groupdiy.com/index.php?topic=2104
INA 217 replacement -- with a good section on noise calculation.

www.groupdiy.com/index.php?topic=6987
Care to review an aplication-specific preamp design for me? -- preamplifier for a soundfield microphone.

www.groupdiy.com/index.php?topic=7528
B-Format buffer preamp, Mk.II -- follow-up to the above thread.

www.groupdiy.com/index.php?topic=10179
INA 163 low noise inputs -- discussion of the INA163 regarding noise and stability.

www.groupdiy.com/index.php?topic=18134
A Direct-Coupled Input-Capacitorless Active Mic Preamp -- using a THAT 1510/1512 IC without input coupling capacitors.

www.groupdiy.com/index.php?topic=19888
Small mic pre/mixer -- simple design based on a THAT1512.

www.groupdiy.com/index.php?topic=20291
IC micpre schematic check -- IC frontend an discrete OPA275-based output stage.

www.groupdiy.com/index.php?topic=22694
Portable Mic/Pre for field recording -- simple electret preamp.

Hybrid Transistor/IC Designs:
www.groupdiy.com/index.php?topic=73
Millenia hv 3 -- short discussion of this design by John La Grou.

www.groupdiy.com/index.php?topic=344
SM Pro PR8 Mic Preamps -- reverse engineering and modding the PR8.

www.groupdiy.com/index.php?topic=4004
AMEK 2500 mic pre: how does it work? -- discussion of the 2500 circuitry and similar designs.

www.groupdiy.com/index.php?topic=4317
Amek Neve 9098/9098i Query -- discussion of the 9098/9098i circuitry.

www.groupdiy.com/index.php?topic=6926
Matching Transistors for Valley People MicPre -- good information on how to match transistors for a low-noise frontend and discussion of the Trans Amp.

www.groupdiy.com/index.php?topic=7661
Preamp Project -- evolution of a transformerless microphone preamplifier project.

www.groupdiy.com/index.php?topic=9718
supergreen: I did it! -- slighty altered implementation of the 9098/9098i.

www.groupdiy.com/index.php?topic=10726
Qs for AES PrePrint 2106 (Cohen Transformerless Mic Pre) -- discussion of this famous design.

www.groupdiy.com/index.php?topic=10757
Double balanced microphone preamp project -- same topic as the above thread.

www.groupdiy.com/index.php?topic=11144
This Works -- simple design with a discrete frontend and an opamp-based second stage.

www.groupdiy.com/index.php?topic=15916
Valley People Op Amp -- documentation for these amplifiers.

www.groupdiy.com/index.php?topic=18029
N E V E 5 0 1 2 -- short and informal discussin of this rather new commercial design.

www.groupdiy.com/index.php?topic=20038
Mic Preamp Schematic Collection -- several design ideas. Good discussion of the famous "Cohen" transformerless topology.

www.groupdiy.com/index.php?topic=20223
Another hybrid mic preamp -- bipolar transistors and a dual opamp.

www.groupdiy.com/index.php?topic=22419
Benchmark Mic Pre Schematic from 1984 -- the name says it all.

Discrete Transistor Designs:
www.groupdiy.com/index.php?topic=1503
Discrete opamps in the instrumentation config. -- good discussion of typical transformerless preamplifier topologies.

www.groupdiy.com/index.php?topic=1964
why are there so few discrete transformerless mic preamps? -- discussion of some transformerless preamplifier topologies.

www.groupdiy.com/index.php?topic=2043
Transformerless discrete balanced micamp -- a few solutions to the discret transformerless preamplifier problem.

www.groupdiy.com/index.php?topic=2074
[DESIGN] Original(?) mike-amp design -- unfinished design, but a lot of good reading here on many issues with transformerless preamplifiers.

www.groupdiy.com/index.php?topic=4510
Different differential -- simple preamplifier.

www.groupdiy.com/index.php?topic=5984
Transformerless JFet mic preamp -- short discussion of the Borbely Audio preamplifier.

www.groupdiy.com/index.php?topic=7511
Simple Single Ended Mic Pre -- unbalanced preamplifier for a 5 V wall wart.

www.groupdiy.com/index.php?topic=8144
Exploring the monster (trafoless mic pre input) -- another possible topology.

www.groupdiy.com/index.php?topic=12480
INA134 instead of input transformer???? -- a simple discrete frontend.

www.groupdiy.com/index.php?topic=20060
Mic pre module thing -- a simple discrete frontend.

www.groupdiy.com/index.php?topic=21050
Altec 1578A octal mic-pre plug-in ** now with circuit ** -- the name says it all.

Tube Designs:
www.groupdiy.com/index.php?topic=4137
Transformerless tube mic preamp schem -- design with two ECC83/12AX7. Suggested improvements by knowledgable people.

Hybride Tube Designs:
www.groupdiy.com/index.php?topic=8050
FETCODED -- JFETs and tubes combined.

www.groupdiy.com/index.php?topic=20156
Hybrid As Always -- BJTs and tubes.

www.groupdiy.com/index.php?topic=20366
Another transformerless mic preamp -- again bipolar frontend and tubes.


Transformerbalanced Input:

IC Based Designs:
www.groupdiy.com/index.php?topic=1221
Captain Kraplin Mic Pre-amp -- a battery-powered design based on a Sowter input transformer and an OP27. Good information on zobel networks for input transformers as well.

www.groupdiy.com/index.php?topic=4485
Any one know the Focusrite mic pre topology? -- good information on the ISA110.

www.groupdiy.com/index.php?topic=6419
my new mic pre-comments please -- simple design based on a Neutrik NTM4 and OPA604.

www.groupdiy.com/index.php?topic=8438
Constructing A Klein + Hummel Mic Preamp - Can Anyone Help? -- how to use a Beyerdynamic TR/BV35806 input transformer.

www.groupdiy.com/index.php?topic=8543
Can Someone Check This Mic Pre Schematic Please? -- follow-up to the above thread.

www.groupdiy.com/index.php?topic=16537
Preamp Project: Samuel Groner's Shared Gain Preamp -- follow-up to the above thread.

www.groupdiy.com/index.php?topic=18300
Solving Oscillation In An Opamp-based Mic Pre....??? -- follow-up to the above thread.

www.groupdiy.com/index.php?topic=8624
Opamp Mic Pre Design (Transformer In/Out) -- simple design with an OPA604 gain stage.

www.groupdiy.com/index.php?topic=8626
Jung mic pre - anyone tried it? -- discussion of the Jung design which uses a Jensen JT-16-A/B, a LT1115 and a LT1010. ICs are biased into class A.

www.groupdiy.com/index.php?topic=9683
St*der D19 Mic Pre -- discussion of an interesting topology which includes the input transformer in the feedback network for reduced distortion.

www.groupdiy.com/index.php?topic=9727
fully differential transformer balanced mic pre? -- evolution of a design which started with two OPA2604s and ended with one of them. Good information on balanced transformer loading by Bill Whitlock.

www.groupdiy.com/index.php?topic=13280
Low-noise opamp for battery-powered preamp. -- battery powered two-stage design.

www.groupdiy.com/index.php?topic=15640
MCI mic pre -- Jensen input transformer and one high-voltage IC.

www.groupdiy.com/index.php?topic=18939
Sad Mike Amp /Xformer balanced in/out DC servo -- input transformer, SSM2019 and an OPA275.

www.groupdiy.com/index.php?topic=19621
OPA2228 Based MicPre -- how to use an OPA2228 for a microphone preamplifier.

www.groupdiy.com/index.php?topic=20038
Mic Preamp Schematic Collection -- several design ideas.

Hybrid Transistor/IC Designs:
www.groupdiy.com/index.php?topic=20038
Mic Preamp Schematic Collection -- several design ideas.

Discrete Transistor Designs:
www.groupdiy.com/index.php?topic=2929
992 opamps application, doubt -- design based on a Jensen JT-16-B and a JFET-992.

www.groupdiy.com/index.php?topic=3808
Melcor AML-27 Preamp questions -- some info on the Melcor AML-27.

www.groupdiy.com/index.php?topic=5439
So I've got these 990s.... -- excellent information on how to build a Twin Servo preamplifier and on the 990C.

www.groupdiy.com/index.php?topic=6231
high microphone level output, microphone preamp -- about as simple as it gets.

www.groupdiy.com/index.php?topic=6440
My first schematic. -- based on a JH-990C discrete opamp and a Cinemag CMMI-8-PCA.

www.groupdiy.com/index.php?topic=6573
Great River OpAmp -- discussion of the MP-2/MP-4 circuitry.

www.groupdiy.com/index.php?topic=7793
Beyer micpre - circuit analysis & sims -- short discussion of a three-transistor preamplifier.

www.groupdiy.com/index.php?topic=7934
Darlington spinoff: bcarso's preamp circuits -- interesting design with JFET-frontend.

www.groupdiy.com/index.php?topic=8537
TZ81 Transistor -- schematics for the Altec 1588B microphone preamplifier.

www.groupdiy.com/index.php?topic=9537
fet boy -- microphone preamplifier based on Hamptone JFP gain modules.

www.groupdiy.com/index.php?topic=10047
anyone got a schemo for this pre and or EQ -- some info on the Avalon M3.

www.groupdiy.com/index.php?topic=12130
Calrec1061 PREAMP redesign schematic - thoughts? -- interesting redesign.

www.groupdiy.com/index.php?topic=14725
v72t -- schematic for this early transistorised preamplifier.

www.groupdiy.com/index.php?topic=160359
Bryston BMP-2 Mic Preamp -- some info on this preamp.

www.groupdiy.com/index.php?topic=17219
characteristics input trafo -- simple two-transistor design.

www.groupdiy.com/index.php?topic=17701
312 preamp in my way -- a variation of this most famous preamplifier.

www.groupdiy.com/index.php?topic=18107
Studer mic preamp - modified diy -- simple discrete design.

www.groupdiy.com/index.php?topic=18356
DIY DUAL GERMANIUM MIC PRE-EQ BASED ON NEVE EARLY DESIGNS -- tha name says it all.

www.groupdiy.com/index.php?topic=11466
Racking Spectra Sonics 101 -- how to use these cards.

Tube Designs:
www.groupdiy.com/index.php?topic=1948
Another tube preamp/lineamp circuit -- preamplifier with a 12AV7 and a 12BH7A.

www.groupdiy.com/index.php?topic=3397
Collins 6q-1 mic preamp pics and schemo -- two tubes per channel.

www.groupdiy.com/index.php?topic=3452
Let's try this again - Al's Mic Pre... -- another tube design with something to learn from.

www.groupdiy.com/index.php?topic=3923
High-Gain Amplifier Circuit -- high gain with three dual tubes.

www.groupdiy.com/index.php?topic=3987
Very simple tube preamp -- one 12AX7 does it!

www.groupdiy.com/index.php?topic=6204
Single-tube preamp revisited -- follow-up to the above thread.

www.groupdiy.com/index.php?topic=6711
One-Bottle Preamp -- follow-up to the above two threads.

www.groupdiy.com/index.php?topic=7292
R*E*D Forty Seven -- some info on this famous tube preamplifier.

www.groupdiy.com/index.php?topic=11051
Extra simple valve preamp with a good sound? -- follow-up to the above three threads.

www.groupdiy.com/index.php?topic=9361
ef 86 / ecc 81 mic pre -- a pentode and a dual triode to be found here.

www.groupdiy.com/index.php?topic=9825
second mic pre finished *pics* -- follow-up to the above thread.

www.groupdiy.com/index.php?topic=10075
mic-pre #3 -- one with an EF83, an EF11 and a ECC82.

www.groupdiy.com/index.php?topic=11456
io micpre #4 -- another tube preamp.

www.groupdiy.com/index.php?topic=11554
Simple tube Mic preamp help -- how to design a tube pre as simple as possible.

www.groupdiy.com/index.php?topic=12546
Western Electric 417A Tube Preamp -- design with one bottle.

www.groupdiy.com/index.php?topic=12637
6SN7 / 6CG7 preamp -- design with three triodes.

www.groupdiy.com/index.php?topic=12676
micpre#5 -- three pentodes in it.

www.groupdiy.com/index.php?topic=13167
Microphone preamp idea -- simple tube preamp ideas.

www.groupdiy.com/index.php?topic=13171
Slow Blow pre? -- another tube preamplifier.

www.groupdiy.com/index.php?topic=13355
Aikido microphone preamp -- tube preamp with four bottles.

www.groupdiy.com/index.php?topic=14185
mic pre #7 -- three tubes here.

www.groupdiy.com/index.php?topic=14136
6EM7 Mic Preamp -- design with two tubes.

www.groupdiy.com/index.php?topic=14327
One Tube Pre -- another one with two tubes.

www.groupdiy.com/index.php?topic=14341
WE 407A Push-Pull Mic Preamp -- oh hell, tubes as well!

www.groupdiy.com/index.php?topic=15024
mic pre with feedback limiter. -- simple microphone preamplifier with built-in limiter.

www.groupdiy.com/index.php?topic=15169
V76 Hack !!! -- simplified V76.

www.groupdiy.com/index.php?topic=16326
Pre/DI -- a tube operation amplifier used as microphone preamplifier.

www.groupdiy.com/index.php?topic=16624
A Pre for your Ribbons -- a design with a lot of gain.

www.groupdiy.com/index.php?topic=17215
WE417A / 12B4A mic pre schematics -- big case here...

www.groupdiy.com/index.php?topic=17301
micpre#9 -- tubes without feedback.

www.groupdiy.com/index.php?topic=17847
R*E*D*D*ish mic preamp -- more tubes!

www.groupdiy.com/index.php?topic=17898
Tube Decibel Meter into Mic Preamp -- converting a level meter into a microphone preamplifier.

www.groupdiy.com/index.php?topic=18121
Another interesting mic preamp -- fully balanced and with interstage iron.

www.groupdiy.com/index.php?topic=18772
My new tube mic pre... and... I´m out for getting married! -- tubes and a 1:18 input transformer!

www.groupdiy.com/index.php?topic=21405
Nuke-'Em E2 Octal Tube Mic Pre -- another tube amplifier circuit.

www.groupdiy.com/index.php?topic=23591
tube mic pre with small-ratio input transformer -- looking for a circuit to use a 1:3 transformer.

www.groupdiy.com/index.php?topic=23466
Interesting schematic -- transformer feedback with tubes.

Hybride Tube Designs:
www.groupdiy.com/index.php?topic=22725
Simple Pre -- iron, vacuum and   silicone.


Microphone Splitter:
www.groupdiy.com/index.php?topic=18501
Active Mic Splitter Ideas -- collecting mic splitter ideas.

www.groupdiy.com/index.php?topic=23873
Mic Splitter with Haufe RK284 transformers -- passive splitter design.


General Design Discussions:

BigMicPreThread - from the old place [on it's way]

www.groupdiy.com/index.php?topic=1421
Interviews with some of the best designers -- thread with links to interviews with well-known designers.

www.groupdiy.com/index.php?topic=3291
mic pre concepts -- a lot to read on microphone preamplifier design.

www.groupdiy.com/index.php?topic=7982
trafoless microphone preamp wish list -- many design ideas, nothing finished!


Phantom Power:

www.groupdiy.com/index.php?topic=280
slow rise phantom power schem -- collecting ideas on how to implement a slow-rise phantom power circuit.

www.groupdiy.com/index.php?topic=2881
Why 48V for phantom power? Who started this convention? -- the name says it all.

www.groupdiy.com/index.php?topic=3079
slow ramp 48v phantom -- discussion of a specific slow-rise phantom power circuit.

www.groupdiy.com/index.php?topic=5139
Barry Porter phantom powering schem -- discussion of a specific slow-rise phantom power circuit by Barry Porter.

www.groupdiy.com/index.php?topic=5591
48v power supply -- the name says it all.

www.groupdiy.com/index.php?topic=6330
What's the deal with phantom power and patchbays? -- the name says it all.

www.groupdiy.com/index.php?topic=6641
Phantom resistor buffer -- resistor value for phantom power and a little reading on forming voltage for electrolytic caps.

www.groupdiy.com/index.php?topic=7881
DC on mic-input transformer primaries -- issues with phantom power and input transformers.

www.groupdiy.com/index.php?topic=7920
Phantom powering: history, specs, and pitfalls -- good article on phantom power.

www.groupdiy.com/index.php?topic=11154
Phantom Powered Mic Box?? -- good links on phantom powering.

www.groupdiy.com/index.php?topic=11844
Phantom power and transformer - how does that work? -- phantom power trough center tap.

www.groupdiy.com/index.php?topic=12614
6AL5 for Slow Start Phantom -- a tube abused for a slow start phantom power supply.

www.groupdiy.com/index.php?topic=12646
Phantom Blocking Caps -- value of input coupling caps.

www.groupdiy.com/index.php?topic=12807
Phantom pwr from a DC to DC converter? -- the name says it all.

www.groupdiy.com/index.php?topic=136454
Some Quick Mic Pre Input Transformer Questions -- why (not) to feed phantom power through a center tab.

www.groupdiy.com/index.php?topic=14746
48v slow regulator question... -- another go on the slow rise phantom power topic.

www.groupdiy.com/index.php?topic=16804
+48 volt phantom supply -- clear but dangerous idea.

www.groupdiy.com/index.php?topic=17075
Phanthom from B+ ? -- how to get 48 V from a high voltage supply (and why not to do so).

www.groupdiy.com/index.php?topic=17779
Phantom power from battery -- get 48 V from 1.5 V.

www.groupdiy.com/index.php?topic=17809
Phantom LED indicator -- make a LED indicating phantom power.

www.groupdiy.com/index.php?topic=18406
TL783 Bypass Reference Pin Or Not -- the name says it all.

www.groupdiy.com/index.php?topic=18538
pm1000 phantom problem -- troubleshooting phantom power.

www.groupdiy.com/index.php?topic=20108
9 V To 48 V DC-DC Converter Design -- two different DC-DC converter design for getting phantom power from either +9 V or +15 V.

www.groupdiy.com/index.php?topic=21244
Phantom power voltage -- general discussion on phantom power voltage.

www.groupdiy.com/index.php?topic=22325
Phantom current -- how much current can a mic draw?

www.groupdiy.com/index.php?topic=22596
Noisy phantom rail...? -- LM317 stability problems in a phantom power supply.

www.groupdiy.com/index.php?topic=23902
Ramped phantom power project -- the name says it all.


Microphone Input Transformers:

www.groupdiy.com/index.php?topic=1221
Captain Kraplin Mic Pre-amp -- a battery-powered design based on a Sowter input transformer and an OP27. Good information on zobel networks for input transformers as well.

www.groupdiy.com/index.php?topic=5408
OEP transformer measurements -- some measurements on the A262A2E.

www.groupdiy.com/index.php?topic=5513
Microphone Input Transformer Characteristics -- what makes a good input transformer and how to use a power transformer for audio.

www.groupdiy.com/index.php?topic=6045
Zobel network for OEP mic transformer -- best zobel network for the A3E.

www.groupdiy.com/index.php?topic=7881
DC on mic-input transformer primaries -- issues with phantom power and input transformers.

www.groupdiy.com/index.php?topic=12107
Mic TX winding variations -- what about bifilar windings on mic input transformers?

www.groupdiy.com/index.php?topic=12590
high-gain tube mic pres -- good discussion on input transformers for tube preamplifiers.

www.groupdiy.com/index.php?topic=23584
Correct output transformer termination for LL1517? -- the importance of zobel networks.


Input Impedance Of Microphone Preamplifiers:

www.groupdiy.com/index.php?topic=3003
Variable Impedence Mic Input -- some reading on microphone input transformers for variable input impedance.

www.groupdiy.com/index.php?topic=4553
Mic transformer load question -- how does transformer loading affect input impedance?

www.groupdiy.com/index.php?topic=9659
Looking for a variable impedance transformer. -- some ideas for a variable input impedance input transformer.

www.groupdiy.com/index.php?topic=11843
Microphone Impedance Matching -- discussion on microphone loading.


Mixed:

www.groupdiy.com/index.php?topic=6909
Input attenuator help -- how to design a variable input pad.

www.groupdiy.com/index.php?topic=7272
Your mic preamp philosophy -- open discussion about microphone preamplifiers.

www.groupdiy.com/index.php?topic=7725
SSL 9k - background -- good info from the designer itself.

www.groupdiy.com/index.php?topic=9344
How to do a pre shootout, need advice. -- the name says it all.

www.groupdiy.com/index.php?topic=10471
EMI/RFI with Mic preamps (Inductors, Common Mode, etc.) -- how to do RFI protection with transformerless preamplifiers.

www.groupdiy.com/index.php?topic=11968
Question about multistage preamps -- how to distribute gain amongst two stages.

www.groupdiy.com/index.php?topic=12133
AMEK2500 preamp Troubles -- how to measure noise of a microphone preamplifier.

www.groupdiy.com/index.php?topic=17799
Mic Pre Workshopping... -- hints for a microphone preamplifier workshop.

www.groupdiy.com/index.php?topic=17859
Mic Switcher w/48V -- transformer balanced mic switcher.

www.groupdiy.com/index.php?topic=18216
990 noise measurement -- about noise measurement and optimum source impedance.

www.groupdiy.com/index.php?topic=18375
John Hardy 990 vs. 2520: color or no color? -- why do they sound different?

www.groupdiy.com/index.php?topic=18404
Consider the mic amp -- a discussion by Ted Fletcher.

www.groupdiy.com/index.php?topic=18673
Hum madness, driving me wild... how do you fair? -- ideas for reducing hum in a microphone preamplifier.

www.groupdiy.com/index.php?topic=19570
Line into mic pre - how is it designed? -- adding a line input to a microphone preamplifier.

www.groupdiy.com/index.php?topic=20907
DPA HV Microphone (discrete) Power Supply -- how to build a high voltage supply.

www.groupdiy.com/index.php?topic=22683
Mic Pre Front-End PCB -- EMI filter, phantom power, PAD, polarity and high pass filter.

www.groupdiy.com/index.php?topic=22770
using plastic for a chasis to hold a mic pre -- the name says it all.

www.groupdiy.com/index.php?topic=14468
Software audio analyzer to mic pre... impedance issues? -- on measuring microphone preamplifiers.

www.groupdiy.com/index.php?topic=13441
Proper Way to Measure Preamp Gain -- the name says it all.


Related METAs:

www.groupdiy.com/index.php?topic=263
META - API312

www.groupdiy.com/index.php?topic=281
META - Discrete Opamps

www.groupdiy.com/index.php?topic=287
META - Schematic collection links

www.groupdiy.com/index.php?topic=467
META-Transformers

www.groupdiy.com/index.php?topic=2665
META-Power Supplies

www.groupdiy.com/index.php?topic=5150
META - Green Pre

www.groupdiy.com/index.php?topic=8852
META - SSL 9K Preamp

www.groupdiy.com/index.php?topic=42650
META - G9 Tube Micpre


Commercial Inside Views:

www.groupdiy.com/index.php?topic=3005
Pics of that high woltage opamp... -- SPL Gainstation 1.

www.groupdiy.com/index.php?topic=3633
Gear Pr0n !!! pics inside -- Millennia HV-3D.

www.groupdiy.com/index.php?topic=5188
Avalon 747sp inside pics posted -- the name says it all.

www.groupdiy.com/index.php?topic=5236
Avalon M5 Pics -- the name says it all.

www.groupdiy.com/index.php?topic=13304
INSIDE a Red8 -- the name says it all.

www.groupdiy.com/index.php?topic=15674
Inside the Groove Tubes BRICK -- the name says it all.

www.groupdiy.com/index.php?topic=18407
ua l*a* 6 1 0 inside pics -- the name says it all.

www.groupdiy.com/index.php?topic=17530
Sytek? What's inside? -- the name says it all.

www.groupdiy.com/index.php?topic=19330
SSL XLogic Channel -- the name says it all.


External Links:

www.gracedesign.com/support/tech3.pdf -- design philosophy of Michael Grace.

www.johnhardyco.com/pdf/MicPreampEval.pdf -- how to evaluate microphone preamplifiers, by John Hardy.

www.johnhardyco.com/pdf/OutboardMicPreamps.pdf -- John Hardy on preamplifier design.

www.prorec.com/prorec/articles.nsf/files/656897186E8BD823862568D700669DD0 -- interview with John Hardy on different design aspects.

www.mil-media.com/docs/articles/preamps.shtml -- The Design of Microphone Preamplifiers, by John La Grou.


Listening Comparisons:

www.3daudioinc.com
3D Audio -- a well made microphone preamplifier comparison CD ready to order.

www.thelisteningsessions.com
The Listening Sessions -- a ton of mp3s to download.


Literature:

Books that cover microphone preamplifier design directly:
Audio IC Op-Amp Applications
Walter G. Jung
Howard W. Sams & Co., 3rd edition, 1986
ISBN: 0-672-22452-6

Microphone Engineering Handbook
Michael Gayford
Focal Press, 1994
ISBN: 0-7506-1199-5
Chapter 8 (Microphone amplifiers and transformers)

Handbook For Sound Engineers
Glen M. Ballou
Focal Press, 3rd edition, 2002
ISBN: 0-240-80454-6
Chapters 11 (Audio transformer basics), 21 (Preamplifiers and mixers) and 25 (Consoles and computers).

Op Amp Applications Handbook
Walter G. Jung
Newnes, 2005
ISBN: 0-7506-7844-5
www.analog.com/library/analogDialogue/archives/39-05/op_amp_applications_handbook.html

Books with related information, mostly on low-noise design:
Low-Noise Electronic Design
C. D. Motchenbacher and F. C. Fitchen
John Wiley & Sons, 1973
ISBN: 0-471-61950-7

IC Op-Amp Cookbook
Walter G. Jung
Howard W. Sams & Co., 3rd edition, 1987
ISBN: 0-672-22453-4
Part I (Introducing the IC Op Amp) and Part II, Chapter 7 (Amplifier Techniques)

Low-Noise Electronic System Design
C. D. Motchenbacher and J. A. Connelly
John Wiley & Sons, 1993
ISBN: 0-471-57742-1

Audio Electronics
John Linsley Hood
Newnes, 2nd edition, 1999
ISBN: 0-7506-4332-3
Chapter 3 (Preamplifiers and input signals)

Self On Audio
Douglas Self
Elsevier, 2000
ISBN: 0-7506-4765-5
Chapter 10 (Design of moving-coil head amplifiers)

Application notes:
High-Performance Audio Applications of The LM833
www.national.com/an/AN/AN-346.pdf
Section 4 (Transformerless Microphone Preamplifiers)

Microphone Preamp using a THAT 120 Transistor Array
www.thatcorp.com/datashts/dn109.pdf

Configuring gain with the THAT 1510 and 1512
www.thatcorp.com/datashts/dn138.pdf


bobschwenkler

Re: META - Microphone Preamplifiers
« Reply #1 on: December 12, 2008, 04:04:38 PM »
I have an Excel chart designed to be used for calculating the feedback resistor values in a 12 step switched op amp based mic preamp. For download at the top of the page: www.bicyclerecordings.com/312. Direct link: www.bicyclerecordings.com/312/files/GainChartRev.2.xls
Complete 312 to M1 type preamps, and anything in between - hundreds sold - The Hybrid 312: www.schwenkleraudio.com/312

www.dubnarcotic.com
www.schwenkleraudio.com

Svart

Welcome to the GroupDIY leper colony! when something falls off, we just replace it with a tube!
occupation: General Electron Mayhem

Alesis X2 information repository:
http://www.theopiumdenproductions.

Re: META - Microphone Preamplifiers
« Reply #3 on: September 29, 2010, 11:39:43 AM »
Apologies if im posting in the wrong place, first post on this forum.

Quick question, if anyone can help. I am putting together a G9 and found a Transformer with a 15V 1A winding on it. I intend to use this for the phantom power. Does anyone have a problem with this? Is 1A overkill?

Cheers

Charlie

bobschwenkler

Re: META - Microphone Preamplifiers
« Reply #4 on: September 29, 2010, 02:12:43 PM »
1A is way overkill for PP. But also, 15V won't get you to 48V even with a tripler, not even accounting losses from regulation, etc.

The Lab forum is actually the more appropriate place for questions like this. This thread is meant to serve as a convenient aggregation of mic preamp threads, it does not technically function as a thread itself.
Complete 312 to M1 type preamps, and anything in between - hundreds sold - The Hybrid 312: www.schwenkleraudio.com/312

www.dubnarcotic.com
www.schwenkleraudio.com


 

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