FET Hydrophone Pre-Amplifier

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 gate and ground to suppress low frequency excursions of signals if hydrophone moves in water. [Circuit’s schematic diagram source: seekic.com]

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Basic Audio Mixer Using Op-Amp

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 source, each source should not interfere each other on each input line. If each sources has various DC offset level, […]

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