If you are interested in this type of tech...this is the book to read. https://www.amazon.com/Voice-Crystal-H-Peter-Friedrichs/dp/0967190509 https://www.amazon

If you are interested in this type of tech...this is the book to read. https://www.amazon.com/Voice-Crystal-H-Peter-Friedrichs/dp/0967190509 https://www.amazon.com/Voice-Crystal-H-Peter-Friedrichs/dp/0... There is a second book as well which teaches you to create electronic parts from scratch.