If you are looking for more modern or theory-balanced alternatives, consider these highly-rated resources: Master Handbook of 1001 More Practical Electronic Circuits
Many circuits involve mains power or high-voltage capacitors. Always use a current-limited power supply when testing a new build from the handbook. If you are looking for more modern or
Encyclopedia of Electronic Components Volumes 1–3 Author: Charles Platt including audio amplifiers
covering a wide range of applications, including audio amplifiers, radio frequency (RF) circuits, computer circuits, multiplexers, and power supplies. Practical Focus radio frequency (RF) circuits
of circuit design rather than just providing a list of recipes. ARRL Handbook