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Mini Alarm

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Suitable for doors & windows, Portable anti-bag-snatching unit This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand or the clothes of the person carrying the bag by means… Read more »

Whistling Kettle

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Most electric kettles do not produce a whistle and just switch off when they have boiled. Fitting a box of electronics directly onto an electric kettle (or even inside!) to detect when the kettle has boiled is obviously out of the question. The circuit shown here detects when the kettle… Read more »

Plant Watering Watcher – Version II

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Circuit diagram: Electronic Components: R1,R4________470K 1/4W Resistors R2____________47K 1/2W Trimmer Cermet or Carbon R3___________100K 1/4W Resistor R5_____________3K3 1/4W Resistor R6____________15K 1/4W Resistor R7___________100R 1/4W Resistor C1_____________1nF 63V Polyester Capacitor C2___________330nF 63V Polyester Capacitor C3,C4_________10µF 25V Electrolytic Capacitors D1__________1N4148 75V 150mA Diode D2_____________5mm. Red LED IC1___________4093 Quad 2 input Schmitt NAND… Read more »