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| Harmonic Oscillators |
| Invention | Inventor | Year | Patent No. |
| Armstrong Oscillator (Tickler Oscillator) | Edwin Howard Armstrong | 1914 | US1,113,149 |
| Clapp Oscillator | James Clapp | 1948 | |
| Colpitts Oscillator | Edwin H. Colpitts | 1915 | |
| Crystal Oscillator | Paul Langevin | 1917 | FR505,703 |
| Hartley Oscillator | Ralph Vinton Lyon Hartley | 1920 | US1,356,763 |
| Phase-Shift Oscillator | Jack S. Kilby | 1958 | |
| Pierce Crystal Oscillator | George W. Pierce | 1923 | |
| RC Oscillator | | | |
| "Twin-T" Oscillator | | | |
| Vackar Oscillator | | | |
| Wien Bridge Oscillator | Max Wien | 1891 | |
| Multivibrators |
| Invention | Inventor | Year | Patent No. |
| Astable Multivibrator (Relaxation Oscillator) | Henri Abraham
Eugène Bloch | 1918 | |
| Bistable Multivibrator | | | |
| Flip-Flop | William Eccles &
F. W. Jordan | 1919 | |
| D Flip-Flop | | | |
| J-K Flip-Flop | | | |
| S-R Flip-Flop | | | |
| T Flip-Flop | | | |
| Monostable Multivibrator | | | |
| Schmitt Trigger | Otto H. Schmitt | 1938 | |
| Miscellany |
| Invention | Inventor | Year | Patent No. |
| Blocking Oscillator | | | |
| Dynatron Oscillator | | | |
| Fessenden Submarine Oscillator | Reginald Fessenden | 1914 | |
| Frequency Synthesizer | | | |
| Mechanical Oscillator | Nikola Tesla | 1894 | US514,169 |
| Multiple Wave Oscillator (MWO) | Georges Lakhovsky | 1928 | US1,962,565 |
| Numerically (Digitally)-Controlled Oscillator (DCO) | | | |
| Quartz Clock | Warren A.. Marrison &
J.W. Horton | 1927 | US1,788,533
US1,690,299 |
| Sawtooth Oscillator | | | |
| Triangular Wave Oscillator | | | |
| Tunable Oscillator | Michael Pupin | 1893 | |
| Variable Frequency Oscillation Generator | William R. Hewlett | 1942 | US2,268,872 |
| Variable Frequency Oscillator (VFO) | | | |
| Voltage-Controlled Oscillator | | | |
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