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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.
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Super buff. This tape monitor buffer is used to mate hostile impedances and keep distortion from leaking into your tape output.
AUDIO AMATEUR 4/1977 [Dec 1977] (v.8#4) pg. 18
Correction AUDIO AMATEUR 3/1978 [Sep 1978] (v.9#3) pg. 56
Added Info AUDIO AMATEUR 4/1983 [Nov 1983] (v.14#4) pg. 30

Buffer. Provides a wideband high-Z (high-impedance) input and low-Z (low-impedance) output. Features unity gain and plenty of drive capability for any load (such as high capacitance cables).
AUDIO AMATEUR 1/1988 [Feb 1988] (v.19#1) pg. 23
Added Info AUDIO AMATEUR 3/1988 [Aug 1988] (v.19#3) pg. 51
Added Info AUDIO AMATEUR 4/1988 [Oct 1988] (v.19#4) pg. 52
Added Info AUDIO AMATEUR 1/1989 [Feb 1989] (v.20#1) pg. 53
Added Info AUDIO ELECTRONICS 5/1997 [Oct 1997] (v.28#5) pg. 49

A balanced line design. Send and receive modules to convert unbalanced signals to balanced and back again. Can be built to incorporate gain if required and to match any reasonable impedance.
AUDIO AMATEUR 3/1990 [Aug 1990] (v.21#3) pg. 38
Added Info AUDIO AMATEUR 1/1993 [Mar 1993] (v.24#1) pg. 40
Added Info AUDIO AMATEUR 3/1993 [Sep 1993] (v.24#3) pg. 39
Added Info AUDIO AMATEUR 1/1994 [Mar 1994] (v.25#1) pg. 45

Enhanced audio quality on transmit. (1) Circuit for a simple microphone step-down impedance matcher for using a 50K ohm microphone with a modern transmitter that has a 600 ohm microphone input circuit. (2) Microphone selection. (3) Microphone amplifier circuits with bass and treble boost circuitry. (4) Speech processing, etc.
CQ. THE RADIO AMATEUR'S JOURNAL Feb 1994 (v.50#2) pg. 82

A catalog of practical circuits. Part 1. (1) Audio amplifier. (2) Microphone Z matcher.
CQ. THE RADIO AMATEUR'S JOURNAL Nov 1997 (v.53#11) pg. 56

Impedance. How to hook anything to anything.
ELECTRONICS ILLUSTRATED Jul 1965 (v.8#4) pg. 36

One-transistor amplifier will match low-impedance microphones with high-impedance equipment.
ELECTRONICS NOW Apr 1994 (v.65#4) pg. 11
Added Info ELECTRONICS NOW Jul 1994 (v.65#7) pg. 18
Added Info ELECTRONICS NOW Aug 1994 (v.65#8) pg. 12

Audio system integration. A knowledge of impedance matching and an understanding of spec sheets will help you integrate a high-quality public address system.
ELECTRONICS NOW Aug 1996 (v.67#8) pg. 27

A solid-state microphone transformer. Construction of a two-stage, direct-coupled, operational amplifier to match low impedance amplifier inputs. This battery-powered unit is almost noiseless.
ELECTRONICS WORLD Mar 1967 (v.77#3) pg. 68

Circuit designed to match a low-impedance microphone to a tube-type public address amplifier requiring a high-impedance input.
ELEMENTARY ELECTRONICS May-Jun 1977 (v.17#3) pg. 52

Basic building-block circuits are made from the same low-cost IC, the LM324 quad op-amp. (1) AC voltage-follower. (2) Inverting amplifier. (3) Buffer amplifier. (4) Squarewave generator. (5) Instrumentation amplifier (formed by combining the above four circuits).
HANDS-ON ELECTRONICS Feb 1988 (v.5#2) pg. 76

Build an adapter box to interface a sound motion picture projector (or a radio, stereo, phonograph, etc.) to a public address system. Est. cost: $20.
PHOTOMETHODS Jul 1985 (v.28#7) pg. 6

Impedance-matching preamp that will allow you to use an old crystal microphone with a transmitter, PA system, or tape recorder.
POPULAR ELECTRONICS [2] Aug 1990 (v.7#8) pg. 81

High-input-impedance to low-output-impedance converter circuit.
POPULAR ELECTRONICS [2] Sep 1995 (v.12#9) pg. 75

Simple single-transistor circuits. (1) Voltage regulator outputs 6-volts DC. (2) Constant-current output. (3) Simple audio amplifier. (4) Impedance-matching circuit. (5) LED-control circuits turn either off or on in the presence of a DC voltages from 5- to 9-volts. (6) Relay-driver circuit has a latching feature that keeps the relay on once energized.
POPULAR ELECTRONICS [2] Dec 1995 (v.12#12) pg. 77

Preamp circuit provides a transformerless match for low impedance microphones and can drive most system amplifiers.
POPULAR ELECTRONICS [2] Jul 1997 (v.14#7) pg. 67

Computer-designed audio networks. BASIC program eliminates the hard work in designing impedance-matching networks and attenuators for audio systems.
RADIO-ELECTRONICS Nov 1984 (v.55#11) pg. 11 (ComputerDigest)
Correction RADIO-ELECTRONICS Jan 1985 (v.56#1) pg. 5 (ComputerDigest)

"Transi-Match", a one-transistor circuit whose sole function is to match a very high impedance to a very low impedance. Est. cost: $4.
RADIO-TV EXPERIMENTER #780 Apr-May 1966 (v.20#2) pg. 73