Ears and Speakers Protector

Sometimes the output volume of amplifier is too high and hurts our ears. As well as hurting your ears, this incident could damage your loudspeaker. The circuit below can be used to protect both our ears and our loudspeakers from destructive output signal of amplifier, works by deactivating the amplifier when high level signal is detected. This circuit will disable […]

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General-Purpose AF Power Amplifier

This is a schematic diagram of general-purpose audio frequency (AF) amplifier circuit. This circuit uses cheap 1/4-W  resistors, no high precision needed so 5%-tolerance of carbon or metal film units is good enough. This circuit has frequency response range from 16Hz to 30kHz.  This amplifier also accepts standard automotive battery supply voltage range: 12 to 14 V. The gain of […]

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