May 2018 Issue

A summary of this month's contents.

High Performance RF Prescaler

Used in conjunction with your frequency counter (10MHz or so), even if it’s built into your digital multimeter,  you can boost its performance to measure into the gigahertz range.


A frequency divider selector has ratios 10:1 through to 1000:1 which enables the RF Prescaler to interpret higher frequencies and display them accurately on a lower-frequency counter.  The design is good for measuring frequencies of 6GHz or more.

Surface mount design needs good soldering skills


Micromite Backpack V2

The Micromite LCD BackPack (described in the May 2017 issue) is a low cost single board computer programmed in BASIC and, thanks to its low-cost LCD touchscreen, it can be dedicated to interfacing and controlling many systems. The original Micromite BackPack has been a huge hit but it does require an external USB-serial converter before you could load and run programs. A PIC32 programmer is also needed to load or update the MMBasic firmware.

Version 2 of the Micromite Backpack described this month does away with these disadvantages. It includes both the USB/ Serial interface and PIC32 programming capability in a single additional chip, dubbed the ‘Microbridge’, described separately in EPE this month.




The Microbridge has been created as a tool for use in conjunction with the Micromite family of products but it can also be used as a standalone PIC32 programmer and/ or a USB/serial converter for other processors such as Arduino or Raspberry Pi.

Thanks to the Microbridge, Micromite enthusiasts can now add this functionality onto their Micromite, and of course they can also utilise the new Micromite Backpack V2 which incorporates these desirable features.


Teach-In 2018 – Get Testing! Electronic test equipment and measurement techniques.

Part 8: Digital measurements

In the penultimate part of our Teach-In series, our tutors describe how digital data can be read, captured and analysed. Basic logic truth tables are included along with typical discrete logic family parameters. Finally a handy logic probe is also described that you can build yourself on stripboard. If you’re keen to explore the basics of digital logic, Teach-In 2018 is the place to be!


Also in this month’s issue:


  • Techno Talk – how your broadband speed could be affected by interference from elsewhere
  • Net Work – Amazon’s Echo Spot breaks cover in the UK, and reflections on the misfortunes of UK retailer Maplin Electronics
  • PIC n’ MIX – More on FFT (Fast Fourier Transform) and suggestions for a practical DSP (Part 2)
  • Circuit Surgery -  our in-house surgeon explains switching power supply source impedance and regulator stability
  • Audio Out - a bumper edition of the popular column for practical audio enthusiasts, we continue with an analysis of variable audio filters,  looking at voltage-controlled filters.


Next month:


10-Octave Stereo Graphic Equaliser; Arduino-based Digital Inductance/ Capacitance Meter; Low=cost Electronic Modules (Part 5) - a 16x2 LCD display; Teach-In Part 9. Contents may be subect to change.


EPE is packed with practical electronics projects and theory for the hobbyist. You can order a printed copy of EPE for delivery to your door (worldwide), or try the PDF Version (needs Adobe Reader for Windows), or the Pocketmags for your mobile device. Subscribe now!



Source code file


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The May 2008 issue had an electric mobility buggy monitor 'trip computer' by the late John Becker, a Mini Theremin (Part1), and installation notes for the Studio Series preamp series.


PCB artwork


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.

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