Practical Electronics No 4 2025

Read in the issue 4 Practical Electronics 2025

Calibrated MEMS Microphones by Phil Prosser. MEMS (micro-electromechanical system) microphones have advantages over electret mics, such as operating at ultrasonic frequencies. They also have good frequency response characteristics.
ESR Test Tweezers by Tim Blythman. These ESR Test Tweezers can measure ESR and capacitance while being significantly more compact than our previous ESR meter. ESR meters are great for finding faulty electrolytic capacitors in failed equipment.
Low-Noise Mains Fan Speed Controller, Mk2 by John Clarke. On a hot night, a gentle cooling breeze from a fan can keep you cool and help you to sleep. This new Fan Speed Controller is an effective, noise-free, low-speed fan controller. It works with ceiling, pedestal and box fans.

Practical Electronics Magazine is the No. 1 UK magazine for hobby electronics enthusiasts everywhere. Each month’s issue is packed with practical constructional projects for the hobbyist, special features, advice and adverts from specialist electronics suppliers and more besides.

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