Master Handbook of 1001 Practical Electronic Circuits , edited by Kendall Webster Sessions

The handbook covers a vast range of applications, including: Audio & Radio

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Overview of the Book

However, if you are an educator or a professional, it is highly recommended to seek legal digital archives (like the Internet Archive) where you can "borrow" the scan legally. The "hot" aspect of the search often implies that users are looking for a rapid, free download link—but always respect the creator's rights if you intend to profit from the designs.