| article | author | page | issue | |
| 75-Hz wide audio filter | W2OBJ | 14 | Jan 90 | + |
| A deep notch resonant filter | W0THM | 63 | Feb 90 | + |
| Active filters | K6JM | 70 | Feb 78 | + |
| Add-on selectivity for communications receivers | G4GMO | 41 | Nov 81 | + |
| Advanced CW processor | W6NRW | 25 | Dec 86 | + |
| An improved AGC Circuit | W8WFH | 72 | Sep 89 | + |
| Audio agc principles and practice | WA5SNZ | 28 | Jun 71 | |
| Audio amplifier and squelch circuit | W6AJF | 36 | Aug 68 | |
| Audio CW filter | W7D1 | 54 | Nov 71 | + |
| Audio filter building blocks | KB0CY | 74 | Jul 83 | + |
| Audio filter design, computer-aided | KE2J | 15 | Oct 85 | + |
| Audio filter design, elliptic lowpass | W3NQN | 20 | Feb 84 | + |
| Audio filter, tunable, for weak-signal communications | K6HCP | 28 | Nov 75 | + |
| Audio filters, aligning (HN) | W4ATE | 72 | Aug 72 | |
| Audio filters, inexpensive | W8YFB | 24 | Aug 72 | |
| Audio fitter mod (HN) | K6HIL | 60 | Jan 72 | |
| Audio mixer (HN) | W6KNE | 66 | Nov 76 | + |
| Audio module, a complete | K4DHC | 18 | Jun 73 | + |
| Audio oscillator to pulse generator conversion (HN) | W0DLO | 50 | Oct 84 | + |
| Audio processor, communications for reception | W6NRW | 71 | Jan 80 | + |
| Audio response, tailoring (HN) | N1FB | 42 | May 82 | + |
| Audio to microwave amplifier, build your own | Gruchalla, Michael | 12 | Mar 84 | + |
| Audio transducer (HN) | WA1OPN | 59 | Jul 75 | + |
| Audio-oscillator module, Cordover | WB2GQY | 44 | Mar 71 | |
| Audio-oscillator module, Cordover | Correction | 80 | Dec 71 | + |
| Audio-power integrated circuits | W3FQJ | 64 | Jan 76 | + |
| Aural vco provides relative metering | K1ZJH | 97 | Jan 87 | + |
| Automatic gain control, an audio | K7NM | 24 | Sep 84 | + |
| Better audio for mobile operation | K6GCO | 48 | Feb 81 | + |
| Binaural CW reception, synthesizer for | W6NRW | 46 | Nov 75 | + |
| Binaural CW reception, synthesizer for | Comment | 77 | Feb 77 | + |
| Build a QSO "beeper" | KF6CU | 38 | Jan 88 | + |
| Code practice oscillator (weekender) | N2DCH | 65 | Oct 88 | + |
| Compressor, dual channel | W2EEY | 40 | Jul 68 | |
| Converting mobile microphones for handheld VHF transceivers | KD8KZ, WB3JCC | 79 | Mar 86 | + |
| CW acoustical filter | W7BI | 22 | Jan 83 | + |
| CW and RTTY, digital audio filter for | W1OER | 60 | Aug 83 | + |
| CW and RTTY, digital audio filter for | Short circuit | 199 | Aug 84 | + |
| Distortion and splatter | K5LLI | 44 | Dec 70 | |
| Duplex audio-frequency generator with AFSK features | WB6AFT | 66 | Sep 79 | + |
| Dynamic microphones (C&T) | W1DTY | 46 | Jun 76 | + |
| Extended-range VU meter | WB6JNN | 59 | Sep 86 | + |
| Filter for CW, tunable audio | WA1JSM | 34 | Aug 70 | |
| Filter, lowpass audio, simple | OD5CG | 54 | Jan 74 | + |
| Filter, simple audio | W4NVK | 44 | Oct 70 | |
| Filter, tunable peak-notch audio | W2EEY | 22 | Mar 70 | + |
| Filter, variable bandpass audio | W3AEX | 36 | Apr 70 | |
| Filter-frequency translator for CW reception, Integrated audio | W2EEY | 24 | Jun 70 | + |
| Gain control IC for audio signal processing | Jung | 47 | Jul 77 | + |
| Ham Notebook: Mobile HT Audio, The Near Ultimate Solution | W9PXP | 68 | Aug 89 | + |
| Handheld transceiver, audio amplifier for | N1RM | 38 | Jul 81 | + |
| Hang agc circuit for ssb and CW | W1ERJ | 50 | Sep 72 | |
| Headphone cords (HN) | W2OLU | 62 | Nov 75 | + |
| Headphones, dual-impedance (HN) | AB9Q | 80 | Jan 79 | + |
| Headphones, lightweight | K6KA | 34 | Sep 68 | |
| Heath HW-2036 mods (letter) | Mosher, E.A. | 8 | Jun 81 | + |
| Impedance match, microphone (HN) | W5JJ | 67 | Sep 73 | + |
| Improving the audio on the ICOM IC-27 | KD8KZ | 61 | Feb 86 | + |
| Increased flexibility for the MFJ Enterprises CW filters | K3NEZ | 58 | Dec 76 | + |
| Intercom, simple (HN) | W4AYV | 66 | Jul 72 | |
| Microphone preamplifier with agc | Bryant | 28 | Nov 71 | + |
| Microphone, using Shure 401A withDrake TR.4 (HN) | G3XOM | 68 | Sep 73 | + |
| Microphones and simple speech processing | W1OLP | 30 | Mar 80 | + |
| Microphones and simple speech processing | Letter, W5VWR | 6 | Sep 80 | + |
| Microphones, muting (HN) | W6IL | 63 | Nov 75 | + |
| Modifying microphones | VE7CB/W6 | 81 | Jan 87 | + |
| Multiband Speech Processor | KL7ISA | 32 | Apr 89 | + |
| Notch filter, tunable RC | WA5SNZ | 16 | Sep 75 | + |
| Notch filter, tunable RC | Comment | 78 | Apr 77 | + |
| Oscillator, audio, IC | W6GXN | 50 | Feb 73 | + |
| Oscillator-monitor, solid-state audio | WA1JSM | 48 | Sep 70 | + |
| Passive audio filter design, part 2: highpass and bandpass filters | Niewiadomski, S. | 41 | Oct 85 | + |
| Passive audio filter design, part 2: highpass and bandpass filters | Comments, W3NQN | 8 | Nov 85 | + |
| Passive audio filter design, part 3 | Stefan Niewiadomski | 29 | Jan 86 | + |
| Phone patch | W8GRG | 20 | Jul 71 | |
| Phone patch using junk-box parts | K7NM | 40 | Oct 80 | + |
| Phone patches, building and using | N6ARE | 34 | Oct 85 | + |
| Power speaker enhances mobile operation | K1ZJH | 83 | Jan 88 | + |
| Pre-emphasis for asb transmitters | OH2CD | 38 | Feb 72 | |
| Processor for code tapes | W4ULD | 61 | Sep 88 | + |
| RC active filters (letter) | W6NRM | 102 | Jun 78 | + |
| RC active filters using op amps | W4IYB | 54 | Oct 76 | + |
| Receivers, better audio for | K7GCO | 74 | Apr 77 | + |
| Repeaters, speech synthesis for | N9EE | 79 | Mar 84 | + |
| Rf clipper for the Collins S-line | K6JYO | 18 | Aug 71 | + |
| Rf speech processor, ssb | W2MB | 18 | Sep 73 | + |
| Sight and sound CW | W6NRW | 10 | Jan 88 | + |
| Simulated carbon microphones, using with Amateur transmitters | W9MKV | 18 | Oct 81 | + |
| Solo-16 Acoustic CW Speaker:The Weekender, | K1BQT | 12 | Mar 89 | + |
| Speaker-driver module, IC | WA2GCF | 24 | Sep 72 | |
| Speech amplifiers, curing distortion | Allen | 42 | Aug 70 | |
| Speech clipper, IC | K6HTM | 18 | Feb 73 | + |
| Speech clipper, IC | Added notes (letter) | 64 | Oct 73 | + |
| Speech clippers, rf | G6XN | 26 | Nov 72 | |
| Speech clippers, rf | G6XN | 12 | Dec 72 | + |
| Speech clippers, rf | Added notes | 58 | Aug 73 | + |
| Speech clippers, rf | Added notes | 72 | Sep 74 | + |
| Speech clipping (letter) | W3EJD | 72 | Jul 72 | |
| Speech clipping in single-sideband equipment | K1YZW | 22 | Feb 71 | + |
| Speech compressor (HN) | Novotny | 70 | Feb 76 | + |
| Speech processing | W1DTY | 60 | Jun 68 | |
| Speech processing technique, split audio band | W1DTY | 30 | Jun 76 | + |
| Speech processing, principles of | ZL1BN | 28 | Feb 75 | + |
| Speech processing, principles of | Added notes | 75 | May 75 | + |
| Speech processing, principles of | Added notes | 64 | Nov 75 | + |
| Speech processing, split-band (letter) | Schreuer, N7WS | 74 | Feb 80 | + |
| Speech processor for ssb, simple | K6PHT | 22 | Apr 70 | |
| Speech processor, audio-frequency | K3PDW | 48 | Aug 77 | + |
| Speech processor, audio-frequency | Short circuit | 68 | Dec 77 | + |
| Speech processor, IC | VK9GN | 31 | Dec 71 | + |
| Speech processor, logarithmic | WA3FIY | 38 | Jan 70 | + |
| Speech processor, split-band (letter) | WA2SSO | 6 | Dec 79 | + |
| Speech processors (letter) | K3ND | 6 | Aug 80 | + |
| Speech systems, improving | K2PMA | 72 | Apr 78 | + |
| Squelch, audio-actuated | K4MOG | 52 | Apr 72 | |
| Synthesizer-filter, binaural | W6NRW | 52 | Nov 76 | + |
| Tape head cleaners (letter) | K4MSG | 62 | May 72 | + |
| Tape head cleaning (letter) | Buchanan | 67 | Oct 72 | |
| Telephone ring indicator, visual (HN) | W2QLI | 62 | Apr 84 | + |
| TR-2400, external microphone for (HN) | WB2IFV | 64 | Mar 82 | + |
| Understanding telephones | N6ARE | 39 | Sep 85 | + |
| Understanding telephones | Comments, KD7WL | 9 | Apr 86 | + |
| Variable-frequency audio filter | W4VRV | 62 | Apr 79 | + |
| Voice-band equalizer | WB2GCR | 50 | Oct 80 | + |
| Voice-operated gate for carbon microphones | W6GXN | 35 | Dec 77 | + |