DIY transceiver: bandpass & lowpass filter

This is an introduction to electronic filters and part of DIY HAM radio Maker-Blog of HB9GZE witch you find here: https://hb9gze.ch This series covers in different videos: 1. Introduction to electronic filters:    • Introduction to electronic fiilters   2. Designing an analog bandpassfilter :    • DIY transceiver: bandpass & lowpass filter   3. Designing a crystal filter:    • DIY transceiver: Crystal ladder filter   4. Do some experiments with active filters:    • Active filter experiments   5. Setting up a digital IIR filter on a STM32F4:    • Digital filter experiments on STM32F4   see also: 1. Introduction of DIY homebrew HF transceiver,    • Introduction to DIY HAM radio transceiver   2. Antenna amplifier,    • DIY transceiver: Antenna amplifier   3. Bandpass filters,    • DIY transceiver: bandpass & lowpass filter   4. RF mixer,    • RF mixers   5. Crystal filter,    • DIY transceiver: Crystal ladder filter   6. Preamplifier,    • Preamplifier design and test   7. Power-amplifier,    • HF Power-Amplifier MRF101   8. CPU, still open to do... Pls. find documentation, schematics and code on www.hb9gze.ch. There you also fin all the links to the tools I used. Find the code of the digital filter here: https://github.com/HB9GZE/Pub_STM32_A...