Ralph Vinton Lyon Hartley (November 30, 1888 – May 1, 1970) was an electronics researcher. He invented the Hartley oscillator and the Hartley transform, and contributed to the foundations of information theory.

https://en.wikipedia.org/wiki/Ralph_Hartley

Vladimir Aleksandrovich Kotelnikov (Russian Владимир Александрович Котельников, scientific transliteration Vladimir Alexandrovič Kotelnikov, 6 September 1908 in Kazan – 11 February 2005 in Moscow) was an information theory and radar astronomy pioneer from the Soviet Union. He was elected a member of the Russian Academy of Science, in the Department of Technical Science (radio technology) in 1953. From 30 July 1973 to 25 March 1980 Kotelnikov served as Chairman of the RSFSR Supreme Council.

https://en.wikipedia.org/wiki/Vladimir_Kotelnikov

Harry Nyquist (born Harry Theodor Nyqvist /ˈnaɪkwɪst/, Swedish: [nyːkvɪst]; February 7, 1889 – April 4, 1976) was a Swedish-born American electronic engineer who made important contributions to communication theory.

https://en.wikipedia.org/wiki/Harry_Nyquist

https://en.wikipedia.org/wiki/Wildman_Whitehouse

https://github.com/someburner/esp-rfm69

• 3.3V:
  • Voltage regulators: KB33, S20K, F34V, L0RA, L0RB
  • Oscillators: 80e., 80'0
• 5V:
  • Voltage regulators: KB50, L05, L0UA, L0UB
  • Oscillators: R160JAC6s, 16.000-30, A1, A'N, A'a

https://arduino.stackexchange.com/questions/8511/how-to-identify-arduino-mini-pro-5v-vs-3-3v

https://www.allaboutcircuits.com/projects/introduction-to-the-rfm69hw-transceiver/

https://github.com/LowPowerLab/RFM69

https://secondlifestorage.com/t-LG-LGDB218650-Cell-Specifications

John Robinson Pierce (March 27, 1910 – April 2, 2002), was an American engineer and author. He worked extensively in the fields of radio communication, microwave technology, computer music, psychoacoustics, and science fiction.^[1] As a sideline to his professional career he wrote science fiction for many years under various names: John Pierce, John R. Pierce, and J. J. Coupling. Born in Des Moines, Iowa, he earned his PhD from Caltech, and died in Palo Alto, California from complications of Parkinson’s Disease.

https://en.wikipedia.org/wiki/John_R._Pierce