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.
Sub
System |
Processes
|
See
Inputs
See Outputs |
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High
Gain Transistor Drives low power output devices. |
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High
Gain Transistor
- Inverter Makes its output voltage opposite to its input voltage. |
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High
Gain Transistor
- Logic Buffer Provides a digital output that switches between low and high logic levels. |
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Darlington
Pair Transistor - High
Gain High Power Amplifier Buffer to drive higher powered output devices. |
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Darlington
Pair Transistor - Electronic
Switch Turns on an output subsystem or P8 when a rising voltage has reached a certain level. |
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RC
Timer
- Delay unit / Timer Creates a variable short delay before something turns on or turns off. |
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RC
Timer
- Analogue Event Counter Makes a voltage steadily rise according to the number of times an input has switched on and off. |
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P3 |
RC
Timer - Frequency to Voltage converter Converts a pulsing input signal into a steady voltage (this is known as an integrator). |
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P4 |
Thyristor
- Circuit Latch Turns a process or output device on permanently once it has been triggered. It may be reset. |
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P4 |
Thyristor
- Memory Store Indicates, until reset, if an event has taken place. |
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|
P5 |
Output
Transistor - Power Amplifier Buffer used to supply more power/current to an output device or "switch on" another Process Subsystem. |
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|
P5 |
Output
Transistor
- Inverter Converts the "sourcing" output of a process module into a "sinking" output. |
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|
P6 |
Op
Amp Comparator - Signal Comparer
Compares a sensor's output voltage with a reference voltage and "switches on" if it is greater. |
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|
P6 |
Op
Amp
Comparator
- Analogue to Digital Interface Takes a varying analogue input voltage and produces at its output a signal that is either a logic "high" or a logic "low". |
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|
P7 |
555
Astable - Clock/Pulse Generator
Produces a pulsing signal that turns on and off at a chosen rate or frequency. |
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|
P7 |
555
Astable - Alert Controller Repeatedly switches a warning device on and off. |
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P7
|
555
Astable - Variable Tone Generator Generates tones with a wide range of frequencies. This device can be set up to produce musical notes. |
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555
Monostable - Timer/ Momentary Latch Switches an output or process subsystem on for a short specified time (manually resettable during this period). |
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P8 |
555
Monostable - Switch Debouncer
Gets rid of the multiple pulses produced within a switch when it is operated. |
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Sub
System |
Outputs
|
See
Inputs
See Processes |
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OP1
Sourced Sinked |
Filament
Lamp |
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|
OP1
Sourced Sinked |
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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OP1
Sourced Sinked |
On/Off
Flashing L.E.D.'s Flashes two LED's on and off alternately to get attention. |
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OP1
Sourced Sinked |
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. |
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OP2 |
Electromagnetic Counter A pulsed counter that registers events or simply counts up. |
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D.C
Motor 9-12 Volt Drives medium torque motors with "smoothing" against noise and protection against "Back emf". |
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OP2 |
D.C.Motor
3 Volt Drives small low torque motors with "smoothing" against noise and protection against "Back emf". |
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Mini
Loudspeaker 64 ohm Produces a wide range of clearly audible tones when supplied with a pulsing signal. |
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OP2 |
Piezo
Siren Alarm A siren which produces an ear piercing warbling sound. |
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OP3 |
Relay
(Double Pole Double throw D.P.D.T.) Allows seperate control of two different electrical circuits. They power up to 5 amp/ 24volt. |
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OP3 |
Motor
Reverser Changes the direction of rotation of a medium torque motor by the use of a relay. |
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See
Inputs
See Processes |
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Sub
System |
Inputs |
See
Processes
See Outputs |
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Light
Sensor
- Light Dependent Resistor Detects when it has become brighter or if it is light. |
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Dark
Sensor - Light
Dependent Resistor Detects when it has become dimmer or if there is darkness |
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Heat
Sensor
- Thyristor (SCR)
Senses when a rising temperature has reached a certain point |
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Cold
Sensor
- Thyristor
(SCR)
Senses when a falling temperature has decreased to a certain level. |
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Moisture
Sensor
- Moisture Probe
Measures the dampness of a material or senses water. |
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Touch
Sensor Detects the touch of a finger. |
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Angle
Sensor
- Potentiometer Indicates when something has turned through a required angle. |
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IP2 IP3 |
Key
Switch - Latching Type Produces safety or security by the use of a key. |
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|
IP2 IP3 |
Micro
Switch
- Non Latching Type Used to detect the opening, closing, pushing, pulling of an object. |
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|
IP2 IP3 |
Push
to Break Switch - Non
Latching Type Detects if something has been let go or if an object has been removed. |
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|
IP2 IP3 |
Membrane
Switch - Push
to Make / Pressure Switch Responds to being hit, pressed, walked on or detects an object being put into position. |
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IP2 IP3 |
Magnetic
Switch - Reed Switch Detects a magnetic field avoiding the need for physical contact. |
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IP2 IP3 |
Slide
Switch - Latching
Type Operates when slid to the side. |
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IP2 IP3 |
Tilt
Switch - Non-Ltching Momentary Type Detects something falling or leaning over. |
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