Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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The entries are in alphabetical order by magazine name and then in chronological sequence.
To obtain a copy of any magazine article contact your local public library or the publisher.

Quadpod D encoder. A four-channel microphone preamp/encoder. Records main stereo signals and rear ambient information on two sound channels.
AUDIO AMATEUR 3/1971 [Apr 1972] (v.2#3) pg. 8

Circuit for a low-noise transformerless 40 dB mike preamp.
AUDIO AMATEUR 1/1975 [Jun 1975] (v.6#1) pg. 42
Correction AUDIO AMATEUR 4/1975 [Mar 1976] (v.6#4) pg. 40

The Advent MPR-1 microphone preamplifier. A construction project for a high quality outboard preamp that is no longer in production. Can be adapted for use with equipment other than the Advent model 201 cassette recorder.
AUDIO AMATEUR 2/1979 [Apr 1979] (v.10#2) pg. 5
Added Info AUDIO AMATEUR 2/1980 [Mar 1980] (v.11#2) pg. 50
Added Info AUDIO AMATEUR 3/1982 [Aug 1982] (v.13#3) pg. 24

Peak limiter circuit for use between a mike preamp and mixer, or, between a mixer and a tape deck or amplifier. The limiting range is 20dB with a threshold of about 0dB.
AUDIO AMATEUR 2/1982 [May 1982] (v.13#2) pg. 40

More on microphone mixers and preamps.
AUDIO ELECTRONICS 3/1998 [Jun 1998] (v.29#3) pg. 10
Added Info AUDIO ELECTRONICS 4/1998 [Aug 1998] (v.29#4) pg. 43

A splended new microphone preamplifier that is relatively easy and inexpensive to build. Use it anywhere a low-coloration, low-sonic-impact preamp is desired.
AUDIO ELECTRONICS 1/1999 [Jan 1999] (v.30#1) pg. 10

A simple twin-channel microphone preamplifier.
AUDIO ELECTRONICS 1/2000 [Jan 2000] (v.31#1) pg. 54

A switching power supply for a microphone preamp.
AUDIOXPRESS Nov 2001 (v.32#11) pg. 32
Added Info AUDIOXPRESS Apr 2002 (v.33#4) pg. 67
Correction AUDIOXPRESS May 2002 (v.33#5) pg. 67, 72

Big mike and the jimmy. A tube-based microphone preamp design. Part 1.
AUDIOXPRESS Feb 2002 (v.33#2) pg. 6

Big mike and the jimmy. A tube-based microphone preamp design. Part 2. Power supply.
AUDIOXPRESS Mar 2002 (v.33#3) pg. 22
Added Info AUDIOXPRESS Nov 2002 (v.33#11) pg. 64 (Electrolytic bypasses)

Big mike and the jimmy. A tube-based microphone preamp design. Part 3. Construction.
AUDIOXPRESS Apr 2002 (v.33#4) pg. 16

A high performance microphone preamp. Design and construction of a very low noise unit that was optimized using SPICE software.
AUDIOXPRESS Oct 2002 (v.33#10) pg. 10
Added Info AUDIOXPRESS Mar 2003 (v.34#3) pg. 69

Circuit for a variable gain microphone preamplifier with built-in squelch. Uses the LM170 AGC/Squelch chip.
CQ. THE RADIO AMATEUR'S JOURNAL Sep 1979 (v.35#9) pg. 72

Microphone preamp for use with CB produces a 15 to 20 dB gain. Est. cost: $10.
ELECTRONICS ILLUSTRATED Mar 1968 (v.11#2) pg. 57

Preamp for CB microphones with impedances from 50 to 1000 ohms. Will add 10 to 20 dB additional gain.
ELECTRONICS ILLUSTRATED May 1969 (v.12#3) pg. 63

Audio preamplifier is a high-gain, low-output impedance circuit that is equalized for general-purpose mike, magnetic phono, or tape head use. Uses an integrated circuit.
ELECTRONICS WORLD Jul 1968 (v.80#1) pg. 26

Simple circuit to insert between mike and speech amplifier to improve the sound by boosting the bass and treble by 18 dB.
ELECTRONICS WORLD Oct 1968 (v.80#4) pg. 92

MOFSET utility 20-dB preamp for oscilloscope, AC voltmeter or VTVM. Also usable with microphones.
ELECTRONICS WORLD Aug 1970 (v.84#2) pg. 62

Big Boost, a self-contained mike/guitar/keyboard preamplifier you can plug directly into the amplifier, the mike, or the electronic musical instrument.
ELEMENTARY ELECTRONICS Mar-Apr 1980 (v.20#2) pg. 27

A stereo balanced transformer input microphone preamp. Can be used to drive the line input of most solid-state, reel-to-reel and cassette tape decks. Utilizes 3 vacuum tubes.
GLASS AUDIO 0/1988 (v.1) pg. 21
Added Info GLASS AUDIO 1/1989 (v.1#1) pg. 28

Microphone preamp circuits for a condenser capsule. (1) 417A/5842 tube. (2) 6CW4 nuvistor. (3) 5687 tube gain stage with direct-coupled cathode follower output.
GLASS AUDIO 1/1998 (v.10#1) pg. 67

Audio booster amp. 20-dB booster is battery powered. Use it to provide extra power to microphone circuit, add an extra microphone input to an amplifier, convert a utility amplifier into an audio-signal tracer, etc.
HANDS-ON ELECTRONICS Summer 1984 (v.2#1) pg. 74

Linear CMOS micropower IC op amps and comparators. Includes circuits for a microphone preamp, function generator, and window comparators.
MODERN ELECTRONICS [2] Dec 1988 (v.5#12) pg. 58

An integrated circuit amplifier powered by four 1.5-volt penlight cells. Suitable as a phonograph or microphone preamplifier, or a boost amplifier in a receiver IF or RF stage, etc. Est. cost: $6.
POPULAR ELECTRONICS [1] Oct 1966 (v.25#4) pg. 57

Multipurpose FET signal tracer. Can be used as a millivoltmeter, output meter, microphone preamplifier, auxiliary audio amplifier, tape recorder monitor, etc., as well as a sensitive signal tracer.
POPULAR ELECTRONICS [1] Apr 1967 (v.26#4) pg. 43

Microphone preamp offers a voltage gain of up to 700 dB.
POPULAR ELECTRONICS [2] Apr 1989 (v.6#4) pg. 25

Simple high impedence microphone preamplifier boosts incoming audio signal by 10 to 20 dB.
POPULAR ELECTRONICS [2] Mar 1990 (v.7#3) pg. 72

Super gain amplifier for miniature microphone uses perf-board construction. Est. cost: $4.
RADIO-TV EXPERIMENTER #814 Dec 1966-Jan 1967 (v.21#3) pg. 69

Battery-powered microphone preamplifier for citizens band should provide a gain of 10 dB with a flat frequency response from 20 to 15,000 Hz.
RADIO-TV EXPERIMENTER Oct-Nov 1968 (v.25#2) pg. 39

Microphone preamplifier for CB transceivers. Output level is adjustable.
SCIENCE & ELECTRONICS [1] Dec 1970-Jan 1971 (v.28#6) pg. 43

Combo-Amp, a combination microphone preamplifier, line amplifier, and volume level meter. Enables you to control tape recorder or P.A. volume level from the microphone position.
SCIENCE & ELECTRONICS [2] Mar-Apr 1981 (v.21#2) pg. 73

Combo-Amp, a combination microphone preamplifier, line amplifier, and volume level meter. Enables you to control tape recorder or PA. volume level from the microphone position.
SCIENCE & ELECTRONICS [2] Mar-Apr 1981 (v.21#2) pg. 73

Combo-Amp, a combination microphone preamplifier, line amplifier, and volume level meter. Enables you to control tape recorder or PA volume level from the microphone position.
SCIENCE & ELECTRONICS [2] Mar-Apr 1981 (v.21#2) pg. 73

How to modify the Advent MPR-1 mike preamp to have switchable gains of 28 and 40dB.
SPEAKER BUILDER 5/1990 [Sep 1990] (v.11#5) pg. 84

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