A sample printed circuit board

Here is a sample of a printed circuit board (parts placement layout) that I found inside the new book: Electronic Circuits Volume 1.1. This one is the 23rd circuit featured inside this book. The quality of the print, the design, and the layout are all excellent. The use of professional CAD and graphic software is obvious. Nothing is hand drawn here. That is good. I like that. Following is a an excerpt from the book about this particular circuit:

A highly reliable doorbell with "touch" switch can be easily constructed with few components. When the "touch" plate is touched by a finger, enough stray power line current is introduced into the transistor T1 so that it conducts. Succeeding transistors T2,T3,T4 also conduct and eventually trigger the doorbell (the bulb lights if one is installed).

The touch switch can be constructed from a copper plate, aluminum foil or similar metallic materials. The supply voltage can be between 6 and 12 volts. The standby current is around 6 mA. Obviously, the circuit can also be applied as an alarm device for metallic objects.

This is interesting for me. It is useful, simple to construct, and the printed circuit board layout is ready made. I just need to photocopy the layout and transfer it on my raw pcb. Super!

New electronic circuits book from Intellin.org available at amazon.com

I found this blog from http://overcupofcoffee.blogspot.com/ about the launching of a new book titled Electronic Circuits Volume 1.1. Since I am an avid electronic hobbyist, I can't resist reading more about it. Here is what the article claims:

The second volume of electronic circuits compilation is packed with 101 electronic circuits. This volume features complete schematic diagrams of the electronic circuits, ready-to-use printed circuit board layouts, and detailed parts placement layouts. Each electronic circuit is explained how it works. Wiring diagrams are also added to help the hobbyist avoid mistakes in the final wiring of the modules.

At the end of the book, numerous tables of electronic parts and replacement information are offered. Electrical characteristics of transistors, diodes, triacs and other components are listed at the appendix. Plus, the printed circuit board layouts are once again printed at the end pages for quick reference purposes.

I think I'm gonna buy a copy of this book and try some of the electronic circuits. The book can be bought conveniently from Amazon.com. Here is the direct link: Electronic Circuits Volume 1.1

The publisher's website is at the www.intellin.org

The first volume titled Electronic Circuits Volume 1.0 is also available from Amazon.com. Click here to get the first volume too.