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Choose
the subsystems you require from the table below; you will
be shown options to choose from.
Use a Block Diagram pop-up window to write down the subsystems you select.
Click here
to create one.You
can either start with the inputs or outputs first. When you have seen one
that you would like to use, single click on
the button in the left hand column: this will "signpost" all the
other subsystems that can directly connect to it. Choose your next subsystem
by looking through the "signposted"
inputs, processes and outputs. Select the one you
want, then repeat until all the subsystems have been chosen.Clicking
on the train above will also help you to piece your system together by taking
you to the circuit selector where you can assemble and check your Block
Diagram as a circuit diagram.You
can also get electronic information about these Input, Process and Output
modules by double clicking on the radio buttons
on the left hand side.
PROCESS
|
Description
of Subsystem
|
Connects with.... |
Current
Amplifier |
Drives low power output devices. | ![]() |
Inverter |
Makes its output voltage opposite to its input voltage. | ![]() |
Logic
Buffer |
Provides a digital output that switches between low and high logic levels. | ![]() |
High
Gain High Power Amplifier |
Output buffer to drive higher powered output devices. | ![]() |
Darlington
Pair |
Turns on an output (or outputs) when a rising voltage at its input reaches a certain level. | ![]() |
Delay
unit / Timer |
Creates a variable short delay before something turns on or turns off. | ![]() |
Analogue
Event Counter |
Makes a voltage steadily rise according to the number of times an input event has occurred. | ![]() |
Integrator
P3 |
Converts a pulsing input signal into a steady voltage (known as a frequency to voltage converter). | ![]() |
Circuit
Latch
P4 Thyristor Control |
Turns an output device on permanently after it has been triggered. It may be reset. | ![]() |
Memory
Store
P4 |
Indicates, until reset, if an event has taken place. | ![]() |
Power
Amplifier
P5 Transistor |
An output Buffer used to supply more current to an output device. | ![]() |
Output
Inverter
P5 |
Converts the "sourcing" output of a process module into a "sinking" output. | ![]() |
Signal
Comparer
P6 Op Amp |
Compares an input voltage with a reference voltage and "switches on" if it is greater. | ![]() |
Analogue
to Digital Interface
P6 |
Takes a varying analogue input voltage and produces at its output a signal that is either a logic "high" or a logic "low" | ![]() |
Clock
Generator
P7 555 Astable |
Produces
a pulsing signal that turns on and off at a chosen rate or specific
frequency.
|
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Alert
Controller
P7 |
Repeatedly switches a warning device on and off. | ![]() |
Variable
Tone Generator
P7
|
Generates different pitched sounds with a wide range of frequencies. This device can be set up to produce musical notes | ![]() |
Timer/
Momentary Latch
P8 Monostable |
Switches an output or process subsystem on for a specified amount of time (the device may be manually reset during this period). | ![]() |
Switch
Debouncer
P8 |
Gets
rid of the multiple pulses produced within a switch when it is operated.
|
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|
OUTPUT
|
Description
of Subsystem
|
Connects with.... |
Filament
Lamp |
Use as an indicator to show that something has happened or to illuminate. |
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Light
Emitting Diode |
Use as a visual indicator to show if something is on or off, or if something has happened. |
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On/Off
Flashing L.E.D.'s |
Flashes two LED's on and off alternately to get attention. |
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Piezo
Sounder (variable tone) |
Used to produce a wide range of quiet tones or musical notes. |
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Buzzer
(mechanical fixed tone) |
Produces a clearly audible alerting sound. |
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Solenoid |
Use to make electronic locks or to move something in and out. |
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Electromagnet |
Picks up materials that are Ferrous using a magnetic field. | ![]() |
Counter
OP2 |
A pulsed electromagnetic counter that registers events or simply counts up. | ![]() |
D.C Motor
|
Drives medium torque / low voltage motors with "smoothing" against noise and protection against "Back emf". | ![]() |
D.C.Motor
3 Volt OP2 |
Drives small low torque / low voltage motors with "smoothing" against noise and protection against "Back emf". | ![]() |
Mini
Loudspeaker |
Produces a wide range of clearly audible tones when supplied with a pulsing signal. | ![]() |
Piezo
Siren
Alarm OP2 |
A siren which produces an ear piercing warbling sound. | ![]() |
Relay
(Double Pole Double throw D.P.D.T.) OP3 |
Allows seperate control of two different electrical circuits that use higher powered output devices (eg car headlamps).These devices may be up to 5 amp/ 24volt. | ![]() |
Motor
Reverser
OP3 |
Changes the direction of rotation of a medium torque motor by the use of a relay. | ![]() |
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|
Sub
System |
Description
of Input
|
Links
with |
Light
Sensor |
Detects when it has got brighter or if it is light. | ![]() |
Dark
|
Detects when it has got dimmer or if there is darkness | ![]() |
Heat
|
Senses when a rising temperature has reached a certain point | ![]() |
Cold
|
Senses when a falling temperature has decreased to a certain level. | ![]() |
Moisture
Sensor |
Measures the dampness of a material or senses water. | ![]() |
Touch
Sensor |
Senses the touch of a finger. | ![]() |
Angle |
Indicates when something has turned through a required angle. | ![]() |
Key
Switch IP2/3 |
Produces safety or security by the use of a key. | ![]() |
Micro
Switch IP2/3 |
Used to detect the opening, closing, pushing, pulling of an object. | ![]() |
Push
to Break
Switch IP2/3 |
Detects if something has been let go or if an object has been removed. | ![]() |
Push
to Make/ Membrane
Switch IP2/3 |
Responds to being hit ,pressed, walked on or detects an object being put into position. | ![]() |
Magnetic
Reed Switch IP2/3 |
Detects a magnetic field avoiding the need for physical contact. | ![]() |
Slide
Switch IP2/3 |
Operates when slid to the side. | ![]() |
Tilt
Switch IP2/3 |
Detects something falling or leaning over. | ![]() |
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