Intercom with telephone (CB7829E)

Old phones with dials can be used in a simple home intercom system, as this circuit from Popular Electronics from the 90's shows.

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Christmas Allegory (CB23759E)
This circuit was found in Radio Electronics magazine from October 1966. It consists of a rhythmic...
Microchip Launches Its First Sigfox FCC-certified Long-Range RF Transceiver and Connectivity Development Kits for IoT Applications
CHANDLER, Ariz., LABEGE, France - Oct. 26, 2016 – Microchip Technology Inc. (NASDAQ: MCHP), a...
Touch Bistable 4011 (CB16943E)
This circuit can be used as an input shield by removing the signal directly from the second port,...