A popular part of ham radio is building equipment. Many hams delight in making contacts with a radio they built themselves. 

• High Sensitivity Crystal Set by Bob Culter, N7FKI  QST January 2007, pp 31-33
• A Simple Regen Radio for Beginners
  QST September 2000, pp 61-64
  A good project for the beginner, a school science project and Scout Radio Merit Badge. The author after receiving correspondence has additional information he has graciously provided Notes. Authors Web page.
• How to Tune In A Regenerative Receiver
• High Performance Regenerative Receiver Design
  QEX November 1998, pp. 24-36
  A discussion about regenerative receiver design and construction. Warning--the AD745JN has been replaced by the AD745KR which has a different pinout. Fortunately, many single 8 pin DIP op amps, such as the NE5534, can be substituted with no changes to the circuit.
• A Regenerative Receiver for Beginners
  ARRL Handbook 1995, pp. 17.68-17.72
  A modern version of the classic regenerative receiver.
• The WBR Receiver
  QST August 2001, pp. 34-37
  Build a simple receiver between the regenerative and the direct-conversion receivers.
  Feedback: QST September 2001, p. 105 (Included in above article) 
• A Broadband HF Amplifier Using Low-Cost Power MOSFETs--Part 1
  QST March 1999, pp. 40-43
  So you finished building your K-2 or K-1. Now what? One watt will get you 40 with this 160- to 10-meter amplifier.
  Note: Kits, as indicated in Note #9, are no longer available from Mouser. PCBoard template: kossor.pdf
• A Broadband HF Amplifier Using Low-Cost Power MOSFETs--Part 2
  QST April 1999, pp. 43-46
• A Binaural I-Q Receiver
  QST March 1999, pp. 44-48
  A receiver replaces the narrow filters and interference-fighting hardware and software of a conventional radio with a wide-open binaural I-Q detector. Picture listening to a chunk of the band in stereo with the signal you want smack in the middle.
• An HF 50-W Linear Amplifier
  ARRL Handbook 1995, pp. 17.93-17.97
  If your QRP transmitter runs 1 to 2 watts, and you would like a little more power. Build this amplifier using a pair of Motorola MRF477s. This part is out of production and may be difficult to find, even though it was around for many years. Template available
• A High Performance Communications Receiver 
  ARRL Handbook 1990, pp. 30-8 to 30-15
  A 5-band, ssb receiver construction project.
• The Principles and Building of SSB Gear -- Part 1
  QST September 1985, pp. 17-19
  This intermediate-level series is aimed at those who want to build a small SSB transmitter and learn how SSB equipment operates. A practical project is described throughout the series.
  Feedback QST November 1985, p. 43 (included in above PDF file)
• The Principles and Building of SSB Gear -- Part 2
  QST October 1985, pp. 27-30
  We'll examine the speech amplifier, balanced modulator, filter, IF amplifier and carrier generator of an SSB generator.
  Feedback QST March 1986, p. 46 (included in above PDF file)
• The Principles and Building of SSB Gear -- Part 3
  QST November 1985, pp. 16-19, 43
  This installment treats the SSB-generator mixer and subsequent low-level, class-A amplifier stages.
• The Principles and Building of SSB Gear -- Part 4 
  QST December 1985, pp. 37-40
  Let's discuss VFOs and examine a practical circuit for use with our SSB transmitter. Emphasis is on stability and purity of the VFO signal.
• The Principles and Building of SSB Gear -- Part 5
  QST January 1986, pp. 29-32
  Man does not live by milliwatts alone! So let's learn how to increase our SSB exciter output power through linear amplification.  
• A Multimode Phasing Exciter For 1 to 500 MHz 
  QST April 1993, pp. 27-31
  A simple transmitter that generates SSB, CW and more. (a mate to High-Performance, Single-Signal Direct-Conversion Receivers )
• Sam Kennedy, KT4QW, shows how to build your own condenser microphone in the December 2003 QST, pages 28-32.

• "Software for hams, engineers and technicians from Jim Tonne W4ENE"
• Jim Garland, W8ZR’s web page has a control box for rigs and amplifiers, a receiver multicontroller, and a sophisticated automatic antenna tuner.
  
• NTE Numeric Semiconductor Specification Sheet List