Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
Click on a see also (sa) or tracing (xx) to view detailed entries about a related subject.
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.

Report on constructing and using the SWTP (Southwest Technical Products) headphone amplifier kit.
AUDIO AMATEUR 4/1974 [Apr 1975] (v.5#4) pg. 30

The headphone connection. A compact, ultra clean headphone amplifier using op amps can be optimized for either dynamics or electrostatics.
AUDIO AMATEUR 3/1982 [Aug 1982] (v.13#3) pg. 7
Correction AUDIO AMATEUR 4/1982 [Oct 1982] (v.13#4) pg. 54
Correction AUDIO AMATEUR 5/1982 [Jan 1983] (v.13#5) pg. 53
Added Info AUDIO AMATEUR 1/1983 [Apr 1983] (v.14#1) pg. 54
Added Info AUDIO AMATEUR 5/1983 [Jan 1984] (v.14#5) pg. 57

An electrostatic headphone amplifier. Solid-state high-voltage amplifier for electrostatic transducers. Suitable for driving most electrostatic headphones, as well as electrostatic midrange and tweeter units for loudspeakers.
AUDIO AMATEUR 2/1991 [Apr 1991] (v.22#2) pg. 18

Headphone amplifier designed for headsets with impedances of 40 ohms or higher. It will not drive electrostatics and won't work with low-impedance headphones unless you add a series resistor. Schematic, parts list and construction advice for this prototype.
AUDIO AMATEUR 4/1991 [Oct 1991] (v.22#4) pg. 40

High-quality headphone amplifier that has a wide frequency response, low noise and distortion, can drive drive a pair of headphones of any impedance, protects against short circuits, and can easily be built.
AUDIO AMATEUR 3/1993 [Sep 1993] (v.24#3) pg. 20
Added Info AUDIO AMATEUR 3/1994 [Sep 1994] (v.25#3) pg. 42

How to incorporate the low-impedance, high-quality HeadRoom Corp. headphone amplifier 24-pin module into a control preamplifier for a high-quality headphone signal. A scratchbuilt project from making circuit boards to lettering the chassis panel.
AUDIO ELECTRONICS 6/1997 [Dec 1997] (v.28#6) pg. 8
Added Info AUDIO ELECTRONICS 3/1998 [Jun 1998] (v.29#3) pg. 40
Added Info AUDIO ELECTRONICS 4/1998 [Aug 1998] (v.29#4) pg. 42

The hearing assistant. A useful project to help the hearing-impaired enjoy TV by controlling the sound volume of an audio output jack (headphone jack) separate from the TV speakers.
AUDIO ELECTRONICS 2/2000 [Mar 2000] (v.31#2) pg. 16

Review of the PHONES-01 Headphone Amplifier kit from Old Colony Sound Lab.
AUDIO ELECTRONICS 2/2000 [Mar 2000] (v.31#2) pg. 38

Build a low-voltage tube hybrid headphone/line amp.
AUDIOXPRESS Nov 2002 (v.33#11) pg. 20
Added Info AUDIOXPRESS Apr 2003 (v.34#4) pg. 63
Added Info AUDIOXPRESS Oct 2003 (v.34#10) pg. 66

Headphone amplifier is based on the ideas of Gary Galo and Walt Jung. Est. cost: $300.
AUDIOXPRESS May 2003 (v.34#5) pg. 52

A single-ended Class A headphone amplifier.
AUDIOXPRESS Jun 2003 (v.34#6) pg. 30

Headphone amplifier for CD players which lack a headphone jack.
ELECTRONICS HOBBYISTS HANDBOOK 1990 pg. 112

Headphone amplifier for an electric guitar lets you practice without disturbing others.
ELECTRONICS HOBBYISTS HANDBOOK Fall 1995 pg. 42

Perfect Pitch, a musician's friend. Microprocessor-based instrument tuner, headphone amplifier, and metronome in one unit. Est. cost: $59 (kit).
ELECTRONICS NOW Jun 1993 (v.64#6) pg. 47

Headphone amplifier circuit uses the LM386 op-amp without the high-frequency oscillation problems associated with this device.
ELECTRONICS NOW Jun 1995 (v.66#6) pg. 8
Added Info ELECTRONICS NOW Sep 1995 (v.66#9) pg. 12

A quality electrodynamic headphone tube amplifier. This special headphone amplifier features the high impedance and high drive voltage required by high-quality headphones. Utilizes 4 vacuum tubes.
GLASS AUDIO 0/1988 (v.1) pg. 23
Added Info GLASS AUDIO 1/1990 (v.2#1) pg. 31
Correction GLASS AUDIO 2/1990 (v.2#2) pg. 42
Added Info AUDIOXPRESS Jan 2001 (v.32#1) pg. 94 (Substitute for PCL805 tube)
Added Info AUDIOXPRESS Jun 2001 (v.32#6) pg. 78 (Substitute for PCL805 tube)

A headphone helper. Drive 600-ohm headphones with this simple, output-transformerless, vacuum tube circuit.
GLASS AUDIO 4/1994 (v.6#4) pg. 12

Brute force in a line stage. Plans for an all-tube line stage preamp to power headphones.
GLASS AUDIO 4/1995 (v.7#4) pg. 1
Added Info GLASS AUDIO 6/1995 (v.7#6) pg. 69
Added Info GLASS AUDIO 3/1996 (v.8#3) pg. 62
Added Info GLASS AUDIO 5/1996 (v.8#5) pg. 62
Added Info GLASS AUDIO 6/1996 (v.8#6) pg. 67
Added Info GLASS AUDIO 1/1997 (v.9#1) pg. 50
Added Info GLASS AUDIO 2/1997 (v.9#2) pg. 58
Added Info GLASS AUDIO 1/1998 (v.10#1) pg. 66

Differential vacuum tube amplifier for electrostatic and electret headphones.
GLASS AUDIO 2/1996 (v.8#2) pg. 38
Added Info GLASS AUDIO 1/1997 (v.9#1) pg. 55

A simple Class A headphone amplifier using an inexpensive 6BN6 vacuum tube.
GLASS AUDIO 3/1996 (v.8#3) pg. 64

Futterman headphone amplifier. An analysis of an electrostatic headphone amp made by Julius Futterman (circa 1979-80).
GLASS AUDIO 4/1998 (v.10#4) pg. 14

Tube-MOSFET headphone amp. Build a hybrid headphone amplifier with good measured performance and excellent sonics.
GLASS AUDIO 4/1999 (v.11#4) pg. 30

Headphone amplifier circuit provides a low output impedance, allowing it to drive 8-ohm headphones.
HANDS-ON ELECTRONICS Sep 1987 (v.4#9) pg. 95

Homebrewing a headphone amplifier to listen to a music radio installed in an aircraft.
KITPLANES Aug 1998 (v.15#8) pg. 32

Build a simple hi-fi amplifier for solid-state phono cartridge. Suitable for driving low-impedance dynamic-type headphones.
POPULAR ELECTRONICS [1] Oct 1966 (v.25#4) pg. 65

Two general-purpose, low-level audio amplifier circuits using IC's. Suitable for driving headphones.
POPULAR ELECTRONICS [1] Jan 1968 (v.28#1) pg. 79

Headphone amplifier for CD players without a headphone jack. A 4-way RCA jack panel allows you to connect this auxiliary amplifier to your CD, while still allowing the CD output signal to be fed to an existing stereo system.
POPULAR ELECTRONICS [2] Mar 1989 (v.6#3) pg. 64

Add a stereo headphone amplifier to your CD player and get all the highs and lows that a CD can deliver.
POPULAR ELECTRONICS [2] Jul 1990 (v.7#7) pg. 67

Audio-squelch circuit can be connected between a receiver's audio output and a loudspeaker to suppress the background noise that's present between transmissions and during tuning. The circuit can also be used as a power amplifier for headphone use.
POPULAR ELECTRONICS [2] Oct 1990 (v.7#10) pg. 80

Simple two-transistor, two-stage audio amplifier can be used to boost the output of an earphone for the hearing impaired.
POPULAR ELECTRONICS [2] Dec 1994 (v.11#12) pg. 31

Build a headphone amplifier for your guitar. Est. cost: $50 (kit).
POPULAR ELECTRONICS [2] Mar 1995 (v.12#3) pg. 33

Amplifier circuit designed to boost low power audio signals (such as headphone output of CD players). Use as a stand alone amplifier or as a preamp.
POPULAR ELECTRONICS [2] Aug 1997 (v.14#8) pg. 66

Amplifier for stereo headphones has individual level controls for each channel. Powered by a 9-volt battery. Est. cost: $15.
POPULAR MECHANICS Jan 1974 (v.141#1) pg. 133

An 8-transistor, push-pull circuit stereo amplifier to drive 8-ohm headphones from a crystal pickup.
RADIO-TV EXPERIMENTER Dec 1968-Jan 1969 (v.25#3) pg. 37

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