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1-100 Transistor circuits.pdf

Go to: 101 - 200 Transistor Circuits Go to: 100 IC Circuits

See TALKING ELECTRONICS WEBSITE
email Colin Mitchell: talking@tpg.com.au

INTRODUCTION

This e-book contains 100 transistor circuits. The second part of this e-book will contain a further 100 circuits. Most of them can be made with components from your "junk box"and hopefully you can put them together in less than an hour. The idea of this book is to get you into the fun of putting things together and there's nothing more rewarding

than seeing something work. It's amazing what you can do with a few transistors and some connecting components. And this is the place to start. Most of the circuits are "stand-alone" and produce a result with as little as 5components. We have even provided a simple way to produce your own speaker transformer by winding turns on a piece of ferrite rod. Many components can be obtained from transistor radios, toys and other pieces of discarded equipment you will find all over the place. To save space we have not provided lengthy explanations of how the circuits work. This has already been covered in TALKINGELECTRONICS Basic Electronics Course, and can be obtained on a CD for $10.00 (posted to anywhere in the world) See Talking Electronics website for more details: http://www.talkingelectronics.com Transistor data is at the bottom of this page and a transistor tester circuit is also provided. There are lots of categories and I am sure many of the circuits will be new to you, because some of them have beendesigned recently by me. Basically there are two types of transistor: PNP and NPN. All you have to do is identify the leads of an unknown device and you can build almost anything. You have a choice of building a circuit "in the air," or using an experimenter board (solderless breadboard) or a matrix board or even a homemade printed circuit board. The choice is up to you but the idea is to keep thecost to a minimum - so don't buy anything expensive. If you take parts from old equipment it will be best to solder them together "in the air" (as they will not be suitable for placing on a solderless breadboard as the leads will be bent and very short). This way they can be re-used again and again. No matter what you do, I know you will be keen to hear some of the "noisy" circuits in operation.Before you start, the home-made Speaker Transformer project and Transistor Tester are the first things you should look at. If you are starting in electronics, see the World's Simplest Circuit. It shows how a transistor works and three transistors in the 6 Million Gain project will detect microscopic levels of static electricity! You can look through the Index but the names of the projects don't giveyou a full description of what they do. You need to look at everything. And I am sure you will.

KIT OF PARTS
Talking Electronics supplies a kit of parts that can be used to build the majority of the circuits in this book. The kit costs $15.00 plus postage.

In many cases, a resistor or capacitor not in the kit, can be created by putting two resistors or capacitors in series or parallel or thenext higher or lower value can be used. Don't think transistor technology is obsolete. Many complex circuits have one or more transistors to act as buffers, amplifiers or to connect one block to another. It is absolutely essential to understand this area of electronics if you want to carry out design-work or build a simple circuit to carry out a task.

THEORY

Read the full article HERE Thefirst thing you will want to know is: HOW DOES A TRANSISTOR WORK?

Diagram "A" shows an NPN transistor with the legs covering the symbol showing the name for each lead. The transistor is a "general purpose" type and and is the smallest and cheapest type you can get. The number on the transistor will change according to the country where the circuit was designed but the types we refer to are...