Tag Archives: Pre-Amplifier

Magnetic Phono Preamp Has Ultra Low Noise Figure

Posted on December 31, 2010 by Rend

This circuit is a ultra low noise magnetic phono preamp. This circuit uses an LM381/1A. This circuit also includes RIAA equalization. This circuit has ultra low noise. The DC voltage level at the output of this circuit is about 16.5V, … Continue reading →

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FET Hydrophone Pre-Amplifier

Posted on December 20, 2010 by Rust

Unwanted noise is eliminated by FET. FET also added capacitance caused by long cobias connecting hydrophone to shore station. Voltage gain is unity. Hydrophone preamp can be used with cables up to 3000 feet long. Use 1 Meg resistor between … Continue reading →

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Basic Audio Mixer Using Op-Amp

Posted on December 6, 2010 by Rust

Audio mixer is used to mix several audio signal from many channel into one channel, in analog form. The basic requirement of an audio mixer is that the mixed signal is a product of simple addition. When connected to several … Continue reading →

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