The Music Mixer circuit board incorporates core electronics concepts suitable for A-level Physics students.
The circuit combines two audio signals, for example music from mobile phones, enabling users to control the volume by experimenting with different electronic components, learn about electronic sensors (e.g. LDRs) and resistor dividers.
The design aims to expose all components and demystifies electronics for students.
The board also has dedicated sections for determining Planck’s constant – by measuring and plotting the voltage and current through four differently coloured LEDs – and experimenting with capacitor discharge.
This introduces potential dividers using an audio mixer circuit. The board has two audio input channels that are mixed together using an amplifier. The volumes of the two channels are controlled by potential dividers where the resistor values can be changed or exchanged with LDRs, or other resistive elements, to control the level of each channel.
This tutorial video walks viewers through the typical use of the Music Mixer and the experiment described in the accompanying exercise notes.
This allows students to explore the discharging of series and parallel capacitors through different resistances. Jumpers J1 and J2 allow the capacitors to be connected in series or parallel.
This tutorial video walks viewers through the typical use of the Capacitor Discharge Section part of the kit, and the experiment described in the accompanying exercise notes.
This allows students to estimate Planck’s Constant by measuring the voltage and current characteristics of a range of different colour light emitting diodes (LEDs). A spreadsheet is provided for students to enter measured values, and estimate Planck’s Constant.
This tutorial video walks viewers through the typical use of the Planck’s Constant part of the kit, and the experiment described in the accompanying exercise notes.
The videos below enable you to find out more about the Music Mixer kit, and the electronic engineering principles that make it work.
This video explores the potential dividers on the Music Mixer kit, how they are used to mix the two input channels, and the wider applications of this technology.
This video explores the functionality of an operational amplifier, how it is used in the Music Mixer kit, and some of the other uses of this widely used electronic component.
If the Music Mixer does not work, first of all:
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