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Home related Circuits
- Fridge door Alarm
- Beeps if you leave open the door over 20 seconds
- 3V battery operation, simple circuitry
- Plant Watering Watcher - Version II
- A flashing LED signals the necessity to water a plant
- Very low current consumption - 3V powered circuit
- Ultra-simple Voltage Probe
- Detects 1.8 to 220 Volts DC or AC
- Minimum parts counting
- Digital Remote Thermometer
- Remote sensor sends data via mains supply
- Temperature range: 00.0 to 99.9 °C
- Self-powered Fast Battery-Tester
- Tests 1.5 to 15 Volt cells
- Two-LED display, no power supply required
- Room Noise Detector
- One LED monitors three levels: 50, 70 & 85 dB
- Useful to detect too noisy environments
- Battery-powered Night Lamp
- Ultra-low current drawing
- 1.5V battery supply
- Infra-red Level Detector
- Useful for liquids level detection and proximity devices
- Up to 50 cm. range, optional relay operation
- Nocturnal Animals Whisker
- A low-rate flashing lamp drives away undesired visitors
- Automatic on-off operation
- Live-line Detector
- Detects the presence of a live mains conductor
- Minimum parts counting
- Heating System Thermostat
- Controlled by indoor and outdoor temperature
- Simple, high reliability design
- Mains Remote-Alert
- Beeper and/or LED remotely-operated via mains supply line
- Simple circuitry, easy to build units
- Cellular Phone calling Detector
- Flashes a LED when detecting an incoming call
- Powered by one 1.5V cell
- AC Current Monitor
- Senses high current-flow into power cables
- No wire-cutting, three versions available
- Temperature-controlled Fan
- Gradually increases speed as temperature increases
- Widely adjustable temperature range
- Self-powered Door-bell Watcher
- Detects if the door-bell has rung in your absence
- Also suitable for different electric appliances
- Dark-activated 230V Lamp
- Compact circuitry using small-size parts only
- Can be wired in parallel to existing switches
- Energy Leak Detector
- High sensitivity, portable temperature comparator
- Detects draughts around doors, windows, etc.
- Broken Charger-connection Alert
- Detects if a device is not properly connected to its supply
- Suitable for battery chargers, portable appliance supplies etc.
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Award winner!
Published on
ELECTRONICS WORLD
"Circuit Ideas"
October 1999 issue, page 819
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- Bedside Lamp Timer
- 30 minutes operation
- Blinking LED signals 6 last minutes before turn-off
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- Timed Beeper
- Beeps 7.5 seconds after a preset time
- Adjustable time settings: 15 s. 30 s. 1 min. 2 min. & others
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Award winner!
Published on
ELECTRONICS WORLD
"Circuit Ideas"
April 2001 issue,
page 299
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- Courtesy Light
- 15 seconds delayed switch-off
- A good idea for bedroom lamps
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- Door Alarm
- Hangs up on the door-handle
- Beeps when someone touches the door-handle from outside
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Award winner!
Published on
ELECTRONICS WORLD
"Circuit Ideas"
September 2001 issue, page 708
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Award winner!
Published on
ELECTRONICS WORLD
"Circuit Ideas"
April 2005 issue,
page 52
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