|Projects in the May
2000 issue of EPE Magazine
this gadget will test your outdoor PIR-controlled lamp, offering a
0-9 digital count of how many times it triggered during the night. Great
for setting up and fault-finding.
Teach-In Part 7 - Op.amps
Onwards we go with our educational series which uses free interactive
software with your PC, to demonstrate electronic principles. This month
our tutor provides an in-depth look at operational amplifiers, describing
many different configurations of this ubiqituous building block. Solderless
breadboard experiments connect directly to the parallel port for on-screen
demos and measurements.
Low-Cost Capacitance Meter is a simple starter project that lets
you measure most capacitors in the range 1nF to 10µF. Switchable range,
moving coil meter display. Stripboard construction, battery operated.
Mic/ Audio Preamp
In the February
2001 issue we suggested FML Electronics as a source of the pre-amp chip
who had a few in stock, call 01677 425840.
Using the new Analog Devices SSM2166 chip, this easy to build but highly
versatile project offers automatic gain control, compression, limiting
and noise reduction. The SSM2166 is designed for processing microphone
inputs to computers but finds itself at the heart of this adaptable constructional
2-Wire Transmission System
Our PIC-based 8 to 16 channel 2-wire on-off signalling system offers a multitude
of applications in security monitoring, alarm systems, model railroad control
and lots more besides! Separate add-on (see June 2000) allows for a complete
voice communication system to be constructed. Free source codes available
from our FTP site.
Our intrepid time travellers describe the plethora of computing developments
during the period 1900-1999, aided and abetted by many interesting photographs
from the pioneering era of computer evolution. Immense in its detail,
the article commences with mechanical computing machines and progresses
onto valve (tube) powered monoliths, ending with today's modern personal
computer. Don't miss our fascinating free wall poster too, listing all
the key developments from 1500- 1999.
Also in this issue, New Technology Update
talks about low voltage MPUs, Circuit Surgery wraps its mini-series on
op.amp chips and Net Work (The Internet Page) examines the latest crop
of free Internet offerings for UK users.