Tutorial de 555

PCB Wizard 3 Tutorial 2
Drawing a 555 timer circuit
Step 1 of 10: Introduction
This tutorial shows you how to design and make an electronic circuit with PCB Wizard. You should
follow this tutorial to learn the basic skills you will need to use PCB Wizard effectively.
Difficulty Level:

Medium (suitable for moderately experienced users)

Getting started
In this tutorial you will create a555
astable timing circuit similar 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
Convert the circuit into a PCB layout
Add text to the PCB
View how the finished PCB will look

Components
To make this circuit you will need:
8-pindual-in-line (DIL) socket
555 timer integrated circuit (IC)
Red LED
1K ohm resistor:
Brown, Black, Red and Gold (4 band)
Brown, Black, Black, Brown and Gold (5 band)

680 ohm resistor:
Blue, Grey, Brown and Gold (4 b and)
Blue, Grey, Black, Black and Gold (5 b and)

10K ohm variable resistor
100µF electrolytic capacitor
PP3 battery and clip
Single pole, single toggle (SPST) switch
plussuitable PCB mak ing equipment

Copyright © 1997-2003 New Wave Concepts Limited. All rights reserved. w w w .ne w -wave-concepts.com

PCB Wizard 3 Tutorial 2
Drawing a 555 timer circuit
Step 2 of 10: 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 willlearn how to use the Gallery to add components
to your circuit. If the Gallery is not currently open, click on the
Gallery button on the top toolbar to open it. Select the Circuit
Symbols option.
In the Circuit Symbol Gallery window, you will be able to see
all the components that are available within PCB Wizard.
Components within the Gallery are grouped according to their function. At thetop 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 do this:
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 themouse 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 Input Components 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.
Itwill 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 Select mode 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 canhelp produce a much neater circuit diagram.

Copyright © 1997-2003 New Wave Concepts Limited. All rights reserved. w w w .ne w -wave-concepts.com

PCB Wizard 3 Tutorial 2
Drawing a 555 timer circuit
Step 3 of 10: 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 toptoolbar.
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 mouse
button. With the mouse button still held
down, move the mouse to place a wire.

(b)
(a)

To complete the wire, release the mouse
button over the left pin of switch SW1 (b).
When...