This handy little tool uses an inexpensive Raspberry Pi Pico microcontroller board and not much else to generate and analyse audio signals. It has oscilloscope and spectrum modes and can run a sweep to plot a frequency response or perform harmonic analysis to check signal quality. It fits in the palm of your hand, is portable and battery powered. by Tim Blythman
This simple device for the home or office will automatically restart your modem or router if it stops working. It can’t stop your internet connection from dropping out, but it will save you the hassle of pulling the power to see if it’s the router at fault (which is often the case, unfortunately). by Nicholas Vinen
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This Test Oscillator produces signals in the 2m band (144-148MHz) even though that is well above its 80MHz oscillator frequency. It can produce a CW signal at three different levels and optionally add frequency modulation. by Andrew Woodfield, ZL2PD
This mighty monoblock amplifier uses a prebuilt module and some relatively inexpensive switchmode supplies to deliver well over 1kW into 2Ω loads and substantial power into 3-8Ω loads. It can be built for around $1000 (that’s more than 1W per dollar) and fits into a metal toolbox, so it’s even portable! by Allan Linton-Smith