Simplest LIRC alsa-audio receiver

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I see simple way for receiving and testing IR remote here: http://www.lirc.org/ir-audio.html But there is even simpler receiver, containing only 1 element! All computer microphones are electret type. They need power to work and in computer microphone input there is provided power just as in this image: This power is…

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Constant impedance attenuator

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To provide attenuation for balanced input of my power amplifier I have to use constant impedance logarythmic attenuator. I decide to use relay switched resistors for best performance. In the Internet there are a lot of relay attenuators, but they aren’t logarythmic or with constant impedance. After hours of thinking…

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