Simple Touch-Sensitive Switch

Solidstate Signal Lamp

Garage Light and Security Control

LED Sand-Glass Timer

LINE-BREAK DETECTOR

Intelligent Water Pump Controller with Water-level Display

220V AC Lamp Toggle Switch Circuit

Frequency Doubler with 4011

Timed Beeper

Plants Watering Watcher

24 Second Shot Clock

28 LED Clock Timer

Piezo Buzzer Driver Circuit Diagram