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 additional components. And this
is the place to start.
Most of the circuits are "stand-alone" and produce a result with as little as 5 parts.
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 TALKING ELECTRONICS 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 been designed recently by me.
Basically there are two types of transistor: PNP and NPN.
We have labelled the NPN transistor as BC547. This means you can use ANY NPN transistor, such
as 2N2222, BC108, 2N3704, BC337 and hundreds of others. Some circuits use TUN for Transistor
Universal NPN and this is the same as our reasoning - the transistor-type is just to let you know
it is not critical.
BC557 can be replaced by: 2N3906, BC327 and many others.
Don't worry too much about the transistor-type. Just make sure it is NPN, it this is the type
needed.
If it is an unknown transistor-type, you need to identify the leads then put it in the circuit.
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 the cost 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 8 Million Gain project will detect microscopic levels of static
electricity! You can look through the Index but the names of the projects don't give you a full
description of what they do. You need to look at the circuits. 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
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