Dorrough Electronics

Dorrough Electronics

• http://www.dorrough.com - Dorrough website.
• https://www.dorrough.com/Usermanuals2.html - Manual archive.
• Dorrough Legacy Product Documentation
• 40-A Loudness Monitor.
• 40-A Tech Manual - Also covers 40-B, 10-A(B), 12-A(B), 20-A(B), 21-A(B)
• 1200 Stereo Test Set.

• DAP310 Discriminate Audio Processor. 1973

  • Power Supply Update replaces diode reference with single chip regulator.
  • 1977 Manual, scanned by Mike Phillips. 16MB
  • 1978 Manual

• DAP610 Discriminate Audio Processor. 1982

  • DAP610 Manual

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  Image from WA3VJB. Full Size

• Schematic PC Board #111-404-
• Schematic Peak Hold Circuit PC Board 110-404-
• Revised Meter Calibration Procedure (Series-1 Only!)
• Schematic For PC Board 154-383-
• Instruction Manual Digital Loudness Meters Models 280 & 380 (Digital Reading Meters)
• Schematic For PC Board 155-385-

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