This circuit is from the 1990 Motorola Linear Databook, which can be developed with more modern equivalent operating systems. The 1 uF capacitor should be of good quality polyester with small leaks
This low hysteresis circuit was obtained from old documentation. The circuit must be powered by a...
This National Semiconductor circuit uses integrated circuits that are uncommon today. The circuit...
Old phones with dials can be used in a simple home intercom system, as this circuit from Popular...