November 2007 Issue
A summary of this month's contents.
TEACH-IN 2008 — PART 1 OF OUR FLAGSHIP EDUCATIONAL SERIES, STARTING IN THE NOVEMBER 2007 ISSUE!
Your very own electrocardiograph that can display your ECG on a home computer. Using our design you can take a look at your own ECG and store samples for reference. Quite simple to build, based on a PIC16F84 microcontroller. USB computer interface. Windows software included. This article also outlines some of 'electrical' operation of the human heart for general interest.
THIS DESIGN IS NOT A SUBSTITUTE FOR CORRECT MEDICAL DIAGNOSIS FROM A QUALIFIED PRACTITIONER. IT IS INTENDED AS AN INSTRUCTIONAL AND EDUCATIONAL DEVICE ONLY. NOT TO BE USED IF A PACEMAKER IS FITTED.
Vehicle Multi-Voltage Monitor
An adaptable bargraph LED voltmeter that is ideal for monitoring a variety of voltage levels in a modern car. Its scale can be trimmed as appropriate - eg. 0-1V for an oxygen sensor or 0-5V for an airflow meter or 10-14V for a car battery.
The multicolour bargraph helps warns of possible malfunction. LM3914 based, +12V operation.
Experimenter's Audio System
A combination of useful modules for radio circuit experimenters. Our project comprises:
- high gain audio pre-amplifier
- switchable audio filters
- power amplifier
- DC stabilised supply
The objective is to achieve high quality and low noise, whilst using easy to source components in a low cost design. The perfect companion for radio circuitry experimenters.
Inductance and Q Factor Meter (Part 2)
This unique projects demonstrates what can be achieved with a relatively simple circuit and some clever programming. With only an ATMEL microcontroller and a handful of components, it functions as a wide range multifrequency inductance and Q-factor meter.
Source codes 1107.zip
PCB artwork pcb1107.zip
As from July 2013 issue PCB artwork is available free to subscribers only.
Non-subscribers may purchase artwork files for a nominal sum. Please contact our Orders Dept for information or to place an order.
EPE Printed Circuit Boards
We can supply ready-made printed circuit boards (8-digit order codes) to the original design specification via mail order or from our Online Shop.