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Silicon Chip February 2014

In the February edition of Silicon Chip Electronics Magazine, build a Super Smooth Full Range Motor Speed Controller for brush motors. This unit features start of the art technology, with a microcontroller-powered full wave rectifier circuit to give exceptional performance at low-speeds all the way up to the maximum speed of the motor. The unit is ideal for use with Electric Drills, Lawn Edgers, Circular Saws and Routers. The unit is designed for 230Vac motors with currents up to 10A. Also this month, build a Stereo Echo and Reverb unit for sound recordings and PA systems. The unit has fully adjustable echo with an inveral of 0-640ms and delay and attenuation adjustable via the front panel controls together with excellent signal to noise performance. The unit has a separate microphone input with also audio input and output sockets. Finally this month, build a high performance entertainment centre based a car radio with coaxial speakers. Car radio units can be purchased quite cheaply and some units have excellent radio units and sound performance, housed in an attractive box, they make an ideal Mini Entertainment Center. All projects come complete with circuit diagram and electronic parts list.

This month's articles cover a miniature satellite controlled by a PICAXE microcontroller unit. Also a look at some of the new Ribidium Frequency Standards Units, now available for under $150. Finally a look at replacing some of the power hungry Mercury lights in a factory, with low power LED units. Plus all the regular columns, including the Circuit Notebook, Serviceman's Log and Vintage Radio are included, providing stacks of great reading.

Part Code: SILCHIPFEB2014


  • PICAXE in Space, Controlling a Miniature Satellite
  • Rubidium Frequency Standards: How They've Shrunk
  • High-Bay LED Lighting for Warehouses
  • Review: Triacrchy USB Mini Spectrum Analyser


  • 230V 10A Speed Controller for Universal Motors, Part 1
  • PortaPAL-D: A Powerful, Portable PA System, Part 3
  • Stereo Echo & Reverberation Unit
  • Build a Start-Of-The-Art Mini Entertainment Unit

Great Value at only $7.90