Tutorial 555

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Livewire Tutorial 2
Drawing a 555 timer circuit
Step 1 of 9: Introduction This tutorial shows you how to draw and simulate an electronic circuit with Livewire. You should follow this tutorial to learn the basic skills you will need to use Livewire effectively. Difficulty Level: Medium (suitable for moderately experienced users)

In this tutorial you will create a 555 astable timing circuitsimilar to the one shown on the right. The circuit will flash an LED on and off. Along the way, you will learn how to: Add components from the Gallery Wire components together Change component values Simulate the circuit View circuit animation Use meters to measure the circuit Record readings using an oscilloscope

Copyright © 2002-2003 New Wave Concepts Limited. All rights reserved. w w w .ne w-wave-concepts.com

Livewire Tutorial 2
Drawing a 555 timer circuit
Step 2 of 9: Adding components You will begin by creating a new (empty) document in which to draw your circuit. To create a new document, click on the New button or choose New from the File menu. Next you will learn how to use the Gallery to add components to your circuit. If the Gallery is not currently open, click on theGallery button on the top toolbar to open it. In the Gallery window, you will be able to see all the components that are available within Livewire. Components within the Gallery are grouped according to their function. At the top of the window, a drop-down list box allows you to select which group is shown. From the Power Supplies group, add a Battery component from the Gallery to your circuit. To dothis: Move the mouse over the Battery symbol. Press and hold down the left mouse button. With the left mouse button still held down, move the mouse to drag the symbol onto the circuit. Finally, release the mouse button when the circuit symbol is in the required position. To make the 555 timer circuit you will also need several other components. Add an SPST Switch and a Variable Resistor the InputComponents group; two Resistors and an Electrolytic Capacitor from the Passive Components group; a 555 Timer from the ICs (Analogue/Mixed) group and finally an LED from the Output Components group. It will help later on if you position the components neatly before you start adding wires to the circuit. You can move components by clicking on the Select button from the top toolbar.

In Selectmode the cursor will appear as a standard pointer:
Pointer cursor

Using the above layout as a guide, try repositioning the components. Thinking about the position of components at the start can help produce a much neater circuit diagram.

Copyright © 2002-2003 New Wave Concepts Limited. All rights reserved. w w w .ne w -wave-concepts.com

Livewire Tutorial 2
Drawing a 555 timer circuitStep 3 of 9: Wiring components together Once the components have been placed, you can start to wire the components together. To do this you must first click on the Select button from the top toolbar. Next, move the mouse over the top pin of the battery (a). As you hold the mouse over the pin you will notice a hint appear describing that particular component pin. Press and hold down the left mousebutton. With the mouse button still held down, move the mouse to place a wire. To complete the wire, release the mouse button over the left pin of switch SW1 (b). When drawing a wire you can add a bend to a wire by releasing the mouse button over or clicking on an empty part of the circuit. You can now wire up the rest of the circuit using the diagram on the right as a guide. Remember that if you getstuck, you can always just click on the Undo button to correct any mistakes: (a)

(b)

Finally, for more detailed help and information on wiring circuits, refer to the topic entitled Wiring components together in the Help.

Copyright © 2002-2003 New Wave Concepts Limited. All rights reserved. w w w .ne w -wave-concepts.com

Livewire Tutorial 2
Drawing a 555 timer circuit
Step 4 of 9:...
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