Subwoofer third order passive low pass filter
Project and schematic of a passive circuit made of capacitors and resistors to be placed before an audio amplifier to filter the high frequencies
Subwoofer active low pass filter
A simple circuit based on the LM358 opamp to be placed before an audio amplifier driving a subwoofer loudspeaker.
Cheap measurement of an audio amplifier input impedance
The calculation requires only a multimeter to measure the effective alternating voltage and a sine source, such as a computer or a mobile phone
Subwoofer passive low pass filter
A simple capacitors and resistors network to be placed before a generic audio amplifier in order to filter the high frequencies
Single power supply modular audio mixer
Schematic and printed circuit board for a single power supply audio mixer, made of a master module and many line in or mic modules.
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