I bought both the TTL and CMOS cookbooks by Don Lancaster during my 20s, still have and love them, and spent so many nights building stuff thanks to their examp

I bought both the TTL and CMOS cookbooks by Don Lancaster during my 20s, still have and love them, and spent so many nights building stuff thanks to their examples. Although they might appear outdated to young electronics enthusiats, I would strongly suggest newbies to get them and learn from them; you won't regret it as the knowledge gained there will help a lot also with more modern stuff such as the Arduinos etc. One of my builds which would have been impossible without the stuff learned on those books was an ultrasound motion sensor built around IIRC a 4070 CMOS quad XOR gates chip: one gate worked as oscillator driving a TX ultrasound transducer, one as linear amplifier driven by a RX ultrasound mike, one as phase detector with its inputs connected to the oscillator and input mike, then one as buffer driving a led when an object was moving in front of the ultrasound capsules. I miss those years!