During more than 20 years. the author, as a collaborator with American, European and Latin American electronics magazines, has published a large assortment of practical circuits using oommon parts.  Now many of those projects and also new projets are included ln this site, most of which you can build in one evening.

 The prolects range from fun types through practical types to amusement types.  Of course, there are other devioes that can be used to teach you something about circuits or oomponents. An important feature of theses projects are the coments intended for students Iooking for projects in science or to use in practical research. 

We can oonsider this book as a source book of the easiest and fun-to-make of the hundreds of projects created and published by the author during these last years. 

But, as the projects are in a wide range of types, we should separate the Electronics experimenters into two groups: the ones who want to improve or expand some other area of their electronics interest, such as computers, radio, instrumentation, audio, security and even games; and the ones who want to Iearn something about electronic circuits and devices or want new ideas to use in scienoe projects.

Most of the projects described herein can be stand-alone as individual accessories; wherever possible the circuits have been designed so that they can be ganged with one or more other projects. For example, many projects of audio effects or generators can be ganged with audio ampliñers or high-porwer output stages. AII the projects are simple, with few Iow-cost components that can be made in one evening of work. To make it easy for the reader to choose the projects we added codes after each titie to indicate the klnd of experimenter for whom they are intended. The code “P" (Practical) indicates a project built for practical use. The code “E“ (Experimental) indicates that the project is lntended for the experimenter to teach somethlng about circuits or devices.

Of course, you can also find projects with both codes (E and P) which can either be mounted to teach something orland be used for a practical end. The presentations of the projects are practical. Electronics components are listed with each circuit diagram and can be found at Mouser, our main advertiser. But secondary parts such as sockets, chassis, enclosures, miscellaneous hardware and so on, are not specified, since the reader is free to choose these non-critical items according to his preferences and demands.

The manner in which the circuits work and can be modified is explained in practical terms so the reader can acquire some knowledge of practical electronics as he progresses through their studies. Although many of the projects we enjoyed constructing as they are described here, you maythink of possible modifications.

We just recommend that you go ahead and modify the circuits to your personal ends. There is a wide latitude in circuit modifications and most of them wiII be of value to the experimenter who wants to see how things work, even though each project's primary intent is for the builder who desires a functional item of equipment as the result of his work. As the section includes easy-to-build projects, the author hopes it wiII help you to Iearn many of the fundamentals of electronics in an easy and fun way, and, if you're a student, provide a source for school projects.