Contents
Foreword Introduction Switches Key to symbols Switches and how they are used
Materials required Taking care with soldering irons
Building a circuit with copper tape
Why we use circuit diagrams
Building a membrane switch Developing graphics ideas for membrane switches
Designing a game Getting started with graphics Two design sheets for developing your own game and switch ideas
Designing an electronic quiz Developing a motorised toy L.E.D.s L.E.D.s - light emitting diodes
Materials required Preventing damage to L.E.D.s
Making and testing the circuit
Circuit diagram Capacitors and time delays
Developing the circuit
Using the circuit Design Ideas Two design sheets for developing your own ideas
Investigating bi-colour L.E.D.s Investigating tri-colour L.E.D.s Flashing L.E.D.s FFlashing L.E.D's MMaterials required Protecting Flashing L.E.D.s
Making and testing the circuit
Circuit diagram Investigating the flashing L.E.D. circuit
Developing the circuit Using the circuit Construction Techniques Two design sheets for developing your own ideas
Ideas for card modelling
The Thyristor
The Thyristor
Materials required Protecting the thyristor
Making and testing the circuit
Circuit diagram
Investigating the circuit
Developing the circuit
Using the circuit Input Control and Output
Two design sheets for developing your own ideas
Other ways to trigger the circuit Sensing light or dark
The Transistor
The Transistor Materials required Protecting the transistor
Making and testing the circuit
Circuit diagram Investigating the circuit
Developing the circuit
Using the circuit
The potential divider
Two design sheets for recording and making notes on possible applications Increasing circuit sensitivity
Pulsed outputs
Index