August 2010

This month’s highlights

PIC-based Flexitimer

This easily programmed low-cost timer module offers up to 54 different timing periods, with independent on-off periods ranging from one second to over three days. One-shot or continuous modes, relay output. 12V operations.

Ultra Low Distortion 200W power amplifier (Part 1)

A truly exceptional new class-AB design using Thermatrak power transistors for maximum stability and protection. Producing high power levels (200W into 4R, 135W into 8R) at very low distortion (rated <0.008% from 20Hz to 20kHz @ 8 ohm). Input sensitivity 1.26V rms, 12k. Finely-tuned double sided pcb design eliminates unwanted magnetic fields to enhance its terrific performance.

DSP Musicolour Part 4: Adding a Remote Control

With a very small PCB add-on, the DSP Musicolour can be operated via an infra-red remote control.

Special feature: Making your own PCBs

Focusing on the user-friendly Seno GS Etch-in-a-bag to make printed circuitboards.

UV Light box for PCBs

A PIC-based digital timer and UV tube set makes for an exposure unit that helps produce more consistent results. Full details of a 4-tube UV unit are included.

Also in this issue:

PIC n MIX – the Propeller processor
Interface – for PC users – Visual Basic 2010
Net Work – the Internet column highlights anti virus packages that fail to detect a potential threat
Circuit Surgery – EPE’s in-house considers potential dividers, and introduces Thévenin’s Theorem.