| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 3B60.00 | Beats | | |
| 3B60.10 | beat forks | PIRA 200 | Two tuning forks differing by about 1 Hz are mounted on resonance boxes. |
| 3B60.10 | beat forks | 3B60.10 | Two tuning forks on resonance boxes, one adjustable. A microphone and scope can be used to display the beat pattern. |
| 3B60.10 | beat forks | S-5a.1 | Two tuning forks differ by 1 Hz but are not mounted on resonance boxes. |
| 3B60.10 | tuning fork beats | Disc 10-18 | Two tuning forks are on resonant boxes. Adjust the frequency of one to be slightly different. |
| 3B60.11 | beat bars | PIRA 1000 | |
| 3B60.11 | beat bars | Si-4 | Two identical bars mounted on resonator boxes are detuned by a movable weight on one. listen to the beats and show on an oscilloscope. |
| 3B60.11 | beat bars | S-4d.2 | The standard tunable bars on a resonance box. |
| 3B60.15 | beat whistles | PIRA 1000 | |
| 3B60.15 | beat whistles | 6C30.15 | Two air whistles can be adjusted to the same pitch. |
| 3B60.15 | beat whistles | Si-5 | Two tunable air whistles are used to demonstrate beats. |
| 3B60.15 | beat notes | S-107 | Start two whistles in unison and change the frequency of one until the difference in frequencies is enough to produce a musical beat note. |
| 3B60.16 | Kipp singing tubes beats | S-5a.2 | Two Kipp singing tubes are tuned to produce beats. |
| 3B60.17 | Galton whistle beats | S-5a.3 | Two Galton whistles can be adjusted to produce "dog beats". |
| 3B60.20 | beats on scope | PIRA 200 | Two audio transformers are fed thru an audio interstage transformer to an oscilloscope and audio amp. |
| 3B60.20 | beats on scope | 3B60.20 | Dual function generators are used to generate a beat pattern that can be amplified and listened to and/or displayed on a scope. |
| 3B60.20 | beats on scope | AJP 29(9),645 | The output of two audio transformers is fed into the secondary of an audio interstage transformer and from there to both an oscilloscope and an audio output transformer. |
| 3B60.20 | beats on scope | 19-5.5 | An interstage audio transformer and an audio output transformer couple two oscillators to an oscilloscope and speaker. |
| 3B60.20 | beats with speaker and oscilloscope | Disc 10-19 | Two function generators are used to make beats that are displayed on a scope and amplified to a speaker. |
| 3B60.22 | beat oscillator switch | AJP 43(12),1103 | A circuit to switch between inputs or the sum of the inputs to allow either the individual frequencies or the beats to be heard. |
| 3B60.30 | beats vs. diff.tone | ref. | see 3C55.35 |
| 3B60.31 | reply to beats misconceptions | AJP 30(11),840 | Beat notes are what the misconceptions are about, beats are just combined frequencies. |
| 3B60.31 | beats vs. difference tones | AJP 30(5),386 | Hey, guys, simple "mixture" of frequencies gives difference tones. Beats are only present when modulation operations are used. |
| 3B60.38 | beat demodulation | AJP 42(7),603 | Two oscillators drive a loudspeaker, switch a diode into the circuit and the modulation frequency can be detected. |
| 3B60.40 | ripple tank beats | PIRA 1000 | |
| 3B60.40 | ripple tank beats | AJP 31(10),794 | Two point sources in a ripple tank run at different frequencies. Theory included. |
| 3B60.40 | ripple tank beats | AJP 50(2),136 | Beats are demonstrated as a moving interference pattern in the ripple tank by using two separate point source generators with variable frequency controls. |