diff --git a/.DS_Store b/.DS_Store deleted file mode 100644 index 0d44d3a9855ad71891b5f9f068aa490a204c815b..0000000000000000000000000000000000000000 Binary files a/.DS_Store and /dev/null differ diff --git a/basic_concepts/imgs-filippos/Supply_filter_caps.png b/basic_concepts/imgs-filippos/Supply_filter_caps.png new file mode 100644 index 0000000000000000000000000000000000000000..3de757a9bb1174257e5f7623eac69057bb48b3ea Binary files /dev/null and b/basic_concepts/imgs-filippos/Supply_filter_caps.png differ diff --git a/basic_concepts/imgs-filippos/cap_loading.jpg b/basic_concepts/imgs-filippos/cap_loading.jpg new file mode 100644 index 0000000000000000000000000000000000000000..a9ec074a678a7ceb1925282988236f84f8c797f7 Binary files /dev/null and b/basic_concepts/imgs-filippos/cap_loading.jpg differ diff --git a/basic_concepts/imgs-filippos/cap_txrx.jpg b/basic_concepts/imgs-filippos/cap_txrx.jpg new file mode 100644 index 0000000000000000000000000000000000000000..4bc5d59237bd6ee305a06fba2a61531000218d14 Binary files /dev/null and b/basic_concepts/imgs-filippos/cap_txrx.jpg differ diff --git a/basic_concepts/imgs-filippos/lp_hp.jpg b/basic_concepts/imgs-filippos/lp_hp.jpg new file mode 100644 index 0000000000000000000000000000000000000000..5edf74eddcfe0020f24351370764a0f233db9f48 Binary files /dev/null and b/basic_concepts/imgs-filippos/lp_hp.jpg differ diff --git a/basic_concepts/imgs-filippos/mosfets.jpg b/basic_concepts/imgs-filippos/mosfets.jpg new file mode 100644 index 0000000000000000000000000000000000000000..2b214ec5381267c77ffe70c921c53c2d67dcdeb2 Binary files /dev/null and b/basic_concepts/imgs-filippos/mosfets.jpg differ diff --git a/basic_concepts/imgs-filippos/nmosfet.jpg b/basic_concepts/imgs-filippos/nmosfet.jpg new file mode 100644 index 0000000000000000000000000000000000000000..f2ad8e88f024ee8f208014cbb4a57215d1c0b836 Binary files /dev/null and b/basic_concepts/imgs-filippos/nmosfet.jpg differ