Got a super fun package from Ian at Bolt Industries today - he doesn’t have much social presence but has been doing cool and fun maker PCBs as small Kickstarter campaigns for several years. These reference circuits are great - nice cards that introduce you to electrical components and circuits, some with USB connectors and a functional example of the component/circuit. You can get Vols 1 & 2 on his website and 0 thru Kickstarter. https://www.boltind.com/