9v battery – Experimental Engineering

SainSmart Frequency Meter

July 16, 2015July 16, 2015 The Engineer

Thanks to Lewis, M3HHY for lending me this one 🙂 Here’s a quick look at a Sainsmart frequency counter module. These are useful little gadgets, showing the locked frequency on a small LCD display. It’s built around an ATMega328 microcontroller (µC), and an MB501L Prescaler IC. The circuit for this

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A/V Gear

Bandridge VA-315

January 5, 2011January 4, 2011 The Engineer

This is a small audio mixer, marketed for camcorder audio dubbing. I/O Panel on the rear of the unit. Contains a small preamp, but will not drive speakers directly. Power is a 9v battery or plugpack. Front of the PCB removed from the case. Mic preamp bottom right corner. Each

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