o Simple, two-wire,
remote monitoring unit
o Three-LED level
display, 9V battery powered
o Beeper or flashing
LED alert
o 1.5V battery powered
portable unit
o Suitable for computer
cooling fans
o LED motor speed
indicator
o Useful for power
lines control
o Simple,
transformerless circuitry
o Suitable for any
Infra-red emitting device
o 3V battery supply
o Water reservoir
automatic level control
o Simple circuitry -
12V supply
o Compact,
transformerless circuitry
o No relays employed
o Alternative version
of the popular circuit
o 3V battery supply -
Still operating at 1.3V
o Powered by two AA
NI-CD batteries
o Four switchable
options
o Clap sensitive on-off
Relay
o 3V Battery operated,
small portable unit
o Detects and counts
inputs and outputs
o Suited to control
Lamps, Household Appliances etc.
o 15 seconds delayed
switch-off
o A good idea for bedroom
lamps
o Hangs up on the
door-handle
o Beeps when someone
touches the door-handle from outside
o 30 minutes operation
o Blinking LED signals
6 last minutes before turn-off
o Beeps 7.5 seconds
after a preset time
o Adjustable time
settings: 15 s. 30 s. 1 min. 2 min. & others
o Gradually increases
speed as temperature increases
o Widely adjustable
temperature range
o Detects if the
door-bell has rung in your absence
o Also suitable for
different electric appliances
o Compact circuitry
using small-size parts only
o Can be wired in
parallel to existing switches
o High sensitivity,
portable temperature comparator
o Detects draughts
around doors, windows, etc.
o Detects if a device
is not properly connected to its supply
o Suitable for battery
chargers, portable appliance supplies etc.
o Detects 1.8 to 220
Volts DC or AC
o Minimum parts
counting
o Remote sensor sends
data via mains supply
o Temperature range:
00.0 to 99.9 °C
o Tests 1.5 to 15 Volt
cells
o Two-LED display, no
power supply required
o One LED monitors
three levels: 50, 70 & 85 dB
o Useful to detect too
noisy environments
o Ultra-low current
drawing
o 1.5V battery supply
o Useful for liquids
level detection and proximity devices
o Up to 50 cm. range,
optional relay operation
o A low-rate flashing lamp
drives away undesired visitors
o Automatic on-off
operation
o Detects the presence
of a live mains conductor
o Minimum parts
counting
o Controlled by indoor
and outdoor temperature
o Simple, high
reliability design
o Beeper and/or LED remotely-operated
via mains supply line
o Simple circuitry,
easy to build units
o Flashes a LED when
detecting an incoming call
o Powered by one 1.5V
cell
o Senses high
current-flow into power cables
o No wire-cutting,
three versions available
o Mains sockets
switched automatically by a Control Socket
o Up to 1000W switched
power
o Beeps if you leave
open the door over 20 seconds
o 3V battery operation,
simple circuitry
o A flashing LED
signals the necessity to water a plant
o Very low current
consumption - 3V powered circuit
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