Dorrough Electronics
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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
"
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-
- Technical Instruction Manual Dorrough Loudness Monitors Models 40-A, B, C2 10-A, B, C2 12-A, B, C2 20-A,B, C2 240-A, B, C-2 400-A, B, C2
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