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The Hi-Fi Section - DIY Projects, from Hi-Fi and Recording magazines etc
 
DIY Projects are listed in Chronological order
 

For the sake of "Readability", most files are in JPG format, however, some maybe in GIF format.. 

File type / size shown in brackets
 
L. N. Hully - An Improved Transistor Amplifier - Hi-Fi News - March 1966
  DIY Project - Part 1   (jpg / 256K)
  DIY Project - Part 2   (jpg / 291K)
  Circuit Diagram   (jpg / 78K)
 
Reginald Williamson - All Silicon Transistor Stereo Control Unit - Hi-Fi News - May 1967
  DIY Project - Part 1   (jpg / 304K)
  DIY Project - Part 2   (jpg / 237K)
  DIY Project - Part 3   (jpg / 291K)
  DIY Project - Part 4   (jpg / 240K)
  DIY Project - Part 5   (jpg / 272K)
  Circuit Diagram   (jpg / 95K)
 
Reginald Williamson - The Twin 20 - Power amplifier - Hi-Fi News - August 1967
  DIY Project - Part 1   (jpg / 275K)
  DIY Project - Part 2   (jpg / 315K)
  DIY Project - Part 3   (jpg / 228K)
  DIY Project - Part 4   (jpg / 314K)
  Specifications   (jpg / 36K)
  Circuit Diagram - Power Amplifier   (jpg / 77K)
  Circuit Diagram - Power Supply   (jpg / 68K)
 
John Crabbe - A Concrete Horn Loudspeaker System Mk II - Hi-Fi News - October / November 1967
  DIY Project - Part 1   (jpg / 194K)
  DIY Project - Part 2   (jpg / 183K)
  DIY Project - Part 3   (jpg / 270K)
  DIY Project - Part 4   (jpg / 261K)
  DIY Project - Part 5   (jpg / 277K)
  DIY Project - Part 6   (jpg / 279K)
  DIY Project - Part 7   (jpg / 234K)
  DIY Project - Part 8   (jpg / 221K)
  DIY Project - Part 9   (jpg / 282K)
  DIY Project - Bass Horn Shape and Dimensions   (jpg / 115K)
  DIY Project - Details of Mid-range Horn   (jpg / 38K)
  DIY Project - Crossover Circuit   (jpg / 16K)
 
Reginald Williamson - Postscript to the Twin 20 - Power amplifier - Hi-Fi News - February 1968
  DIY Project - Postscript   (jpg / 338K)
 
D. R. Driver - Transcription Uni-pivot Pick-up Arm - Hi-Fi News - July 1968
  DIY Project - Part 1   (jpg / 160K)
  DIY Project - Part 2   (jpg / 392K)
  DIY Project - Part 3   (jpg / 148K)
  DIY Project - Part 4   (jpg / 352K)
 
H. E. Owen - Hi-Fi Transistor Microphone - Practical Electronics - November 1968
  DIY Project - Part 1   (jpg / 195K)
  DIY Project - Part 2   (jpg / 167K)
  DIY Project - Part 3   (jpg / 144K)
  DIY Project - Part 4   (jpg / 154K)
  Circuit Diagram   (gif / 8K)
 
D. A. Petty - Stereo Beacon for the QUAD tuner - Hi-Fi News - January 1969
  DIY Project - Part 1   (jpg / 270K)
  DIY Project - Part 2   (jpg / 217K)
  DIY Project - Part 3   (jpg / 271K)
  DIY Project - Part 4   (jpg / 218K)
  Circuit Diagram   (jpg / 22K)
 
Reginald Williamson - The Twin Twenty Mark 2 - Control Unit & Power amplifier - Hi-Fi News - March 1969
  DIY Project - Part 1   (jpg / 258K)
  DIY Project - Part 2   (jpg / 176K)
  DIY Project - Part 3   (jpg / 250K)
  DIY Project - Part 4   (jpg / 285K)
  DIY Project - Part 5   (jpg / 133K)
  DIY Project - Part 6   (jpg / 321K)
  Circuit Diagram - Control Unit   (jpg / 97K)
  Circuit Diagram - Power Amplifier   (jpg / 62K)
  Circuit Diagram - Power Supply   (jpg / 60K)
 
Frank Jones - Pre-amplifier Noise - Using bi-polar transistors to improve older amp's - Hi-Fi News - December 1969
  DIY Project - Part 1   (jpg / 300K)
  DIY Project - Part 2   (jpg / 296K)
  DIY Project - Part 3   (jpg / 159K)
  Circuit Diagram - Modification - Leak Varislope One   (jpg / 64K)
  Circuit Diagram - Modification - QUAD 22 - Circuit Diagram   (jpg / 87K)
 
M. J. Gay - Hi-Fi Stereo - Tri-amp'ed using SL403 IC's - Practical Electronics - December 1969 / January 1970
  DIY Project - Part 1   (jpg / 177K)
  DIY Project - Part 2   (jpg / 100K)
  DIY Project - Part 3   (jpg / 191K)
  DIY Project - Part 4   (jpg / 150K)
  DIY Project - Part 5   (jpg / 163K)
  DIY Project - Part 6   (jpg / 147K)
  DIY Project - Part 7   (jpg / 213K)
  DIY Project - Part 8   (jpg / 218K)
  DIY Project - Part 9   (jpg / 106K)
  DIY Project - Part 10   (jpg / 200K)
  DIY Project - Part 11   (jpg / 146K)
  DIY Project - Part 12   (jpg / 190K)
  DIY Project - Part 13   (jpg / 195K)
 
Nigel Thornbory - A Gimbal Mounted Pickup Arm - Hi-Fi News - February 1970
  DIY Project - Part 1   (jpg / 89K)
  DIY Project - Part 2   (jpg / 247K)
  DIY Project - Part 3  (jpg / 290K)
  DIY Project - Part 4   (jpg / 141K)
  DIY Project - Part 5   (jpg / 198K)
  Parts   (jpg / 226K)
 
Alan C. Ainslie - Variable Speed Turntable Drive - Hi-Fi News - June 1973
  DIY Project - Part 1   (jpg / 245K)
  DIY Project - Part 2   (jpg / 204K)
  DIY Project - Part 3  (jpg / 257K)
  DIY Project - Part 4   (jpg / 270K)
  Circuit Diagram   (jpg / 63K)
 
Reginald Williamson - Octave Equaliser - Hi-Fi News - August 1973
  DIY Project - Part 1   (jpg / 304K)
  DIY Project - Part 2   (jpg / 237K)
  DIY Project - Part 3   (jpg / 291K)
  DIY Project - Part 4   (jpg / 240K)
  DIY Project - Part 5   (jpg / 272K)
  Circuit Diagram   (jpg / 79K)
 
Stephen Hutton - Simple Universal 4-Channel Decoder - Hi-Fi News - December 1973
  DIY Project - Part 1   (jpg / 187K)
  DIY Project - Part 2   (jpg / 53K)
  Circuit Diagram - Main Circuit   (jpg / 82K)
  Circuit Diagram - QS and SQ Networks   (jpg / 25K)
 
L. R. Frisby - A No-compromise Loudspeaker - Hi-Fi News - February 1974
  DIY Project - Part 1   (jpg / 233K)
  DIY Project - Part 2   (jpg / 168K)
  DIY Project - Part 3   (jpg / 279K)
  Dimensions and Cross sectional views   (jpg / 160K)
  Circuit Diagram - X'over   (jpg / 30K)
 
J. Dinsdale - Horn Loudspeaker Design - Wireless World - May / June 1974
  Development of Design Theories - Pages 1 to 12
  DIY Project - Part 1   (jpg / 374K)
  DIY Project - Part 2   (jpg / 260K)
  DIY Project - Part 3   (jpg / 129K)
  DIY Project - Part 4   (jpg / 364K)
  DIY Project - Part 5   (jpg / 286K)
  Tables 1 to 10   (jpg / 437K)
  Table 14 & 15   (jpg / 36K)
  Circuit Diagram   (jpg / 66K)
  Cross Section of Horns   (jpg / 188K)
 
Chris' Rogers - Build this monitor speaker (Transmission line design) - Hi-Fi Answers - August 1975
  DIY Project - Part 1   (jpg / 296K)
  DIY Project - Part 2   (jpg / 202K)
  DIY Project - Part 3   (jpg / 214K)
  DIY Project - Part 4   (jpg / 285K)
  DIY Project - Part 5   (jpg / 196K)
  Figure 1   (jpg / 45K)
  Figure 2   (jpg / 25K)
  Figure 3   (jpg / 23K)
  Figure 4   (jpg / 6K)
  Figure 5   (jpg / 10K)
  Figure 6   (jpg / 4K)
  Figure 7   (jpg / 7K)
  Figure 8   (jpg / 5K)
  Figure 9   (jpg / 13K)
  Figure 10   (jpg / 5K)
  Circuit Diagram - X'over   (jpg / 29K)
 
P. Atkinson - State of the Art Loudspeaker - Hi-Fi News - April 1976
  DIY Project - Part 1   (jpg / 242K)
  DIY Project - Part 2   (jpg / 242K)
  DIY Project - Part 3   (jpg / 268K)
  Circuit Diagram - X'over   (jpg / 41K)
 
R. W. Lawrence - Stereo Digital PPM with LED display - Practical Electronics - October 1976
  DIY Project - Part 1   (jpg / 156K)
  DIY Project - Part 2   (jpg / 181K)
  DIY Project - Part 3   (jpg / 67K)
  DIY Project - Part 4   (jpg / 170K)
  DIY Project - Part 5   (jpg / 175K)
  DIY Project - Part 6   (jpg / 151K)
  DIY Project - Part 7   (jpg / 156K)
  DIY Project - Part 8   (jpg / 148K)
  DIY Project - Part 9   (jpg / 174K)
 
Chris' Rogers - Valves are back - Sirac Mk1 Valve power amplifier - Practical Hi-Fi & Audio - October / November 1977
  DIY Project - Part 1   (jpg / 231K)
  DIY Project - Part 2   (jpg / 364K)
  DIY Project - Part 3   (jpg / 422K)
  DIY Project - Part 4   (jpg / 265K)
  DIY Project - Part 5   (jpg / 415K)
  DIY Project - Part 6   (jpg / 307K)
  DIY Project - Part 7   (jpg / 277K)
  DIY Project - Part 8   (jpg / 317K)
  DIY Project - Part 9   (jpg / 246K)
  DIY Project - Part 10   (jpg / 221K)
  DIY Project - Part 11   (jpg / 235K)
 
Yuri Miloslavskij - Audio amplifier with no T.I.D - Wireless World - August 1979
  DIY Project - Part 1   (jpg / 266K)
  DIY Project - Part 2   (jpg / 191K)
  DIY Project - Part 3   (jpg / 284K)
  DIY Project - Part 4   (jpg / 191K)
  Circuit Diagram   (jpg / 75K)
 
L. F. Fearby - The Fearby Front-end - Hi-Fi News - December 1979
  DIY Project   (jpg / 188K)
 
Ben Duncan - A versatile Active Crossover - Hi-Fi News - February / March / April / May 1981
  DIY Project - Part 1 - The basic design requirements   (jpg / 318K)
  DIY Project - Part 2   (jpg / 286K)
  DIY Project - Part 3   (jpg / 246K)
  DIY Project - Part 4   (jpg / 244K)
  DIY Project - Part 5 - The circuit design   (jpg / 338K)
  DIY Project - Part 6   (jpg / 142K)
  DIY Project - Part 7   (jpg / 315K)
  DIY Project - Part 8   (jpg / 355K)
  DIY Project - Part 9   (jpg / 226K)
  DIY Project - Part 10 - A suitable PPM circuit   (jpg / 291K)
  DIY Project - Part 11   (jpg / 237K)
  DIY Project - Part 12   (jpg / 258K)
  DIY Project - Part 13 - Conclusion   (jpg / 274K)
  DIY Project - Table 1   (jpg / 55K)
  DIY Project - Table 2   (jpg / 48K)
  DIY Project - Table 4 & 5   (jpg / 89K)
  DIY Project - Table 6   (jpg / 39K)
  DIY Project - Figure 9   (jpg / 140K)
  DIY Project - Figure 10   (jpg / 28K)
  DIY Project - Figure 15   (jpg / 41K)
  DIY Project - Figure 18 & 19   (jpg / 73K)
 
Per Hojlev - Moving Coil Amplifier - Circuit Ideas - Wireless World - March 1984
  DIY Project   (jpg / 143K)
 
Circuit Diagrams - For various Audio equipment
 
This list is being "Up-dated" at all times
 
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