примеры использования
The microphone signal was amplified by a low-noise preamplifier and was processed by a two-phase lock-in amplifier.
It is possible for the preamplifier to saturate on a strong signal and produce intermodulation products that degrade reception on adjacent channels.
The seismic components of vocalizations were filtered and amplified separately from the acoustic signals to compensate for not having a preamplifier for the geophones.
All raw myoelectric signals were preamplified .
If you're interested in one of these link leads (contains a preamplifier and speaker, does not require a battery), and/or VHF and UHF radios to suit, give me a call or email.
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