Täysiaaltoilmaisin

Täysiaaltoilmaisin, also known as a full-wave rectifier detector, is an electronic circuit used to detect and measure the amplitude of an alternating current (AC) signal. Unlike half-wave rectifiers which only utilize one half of the AC waveform, a full-wave rectifier converts both the positive and negative halves of the AC signal into a pulsating DC output. This pulsating DC signal is then typically passed through a filter, often a capacitor, to smooth out the pulsations and produce a more stable DC voltage. The smoothed DC voltage is proportional to the amplitude of the original AC signal, allowing for its detection and measurement.

The primary function of a täysiaaltoilmaisin is to extract the envelope or amplitude information from an AC signal. This is particularly useful in radio receivers, where the information is often modulated onto a carrier wave. The täysiaaltoilmaisin demodulates the signal by effectively removing the high-frequency carrier and leaving behind the lower-frequency modulating signal, which carries the audio or other data. It is also employed in various measurement instruments where the AC voltage needs to be converted to a DC equivalent for easier reading by analog or digital meters. The efficiency of a full-wave rectifier is generally higher than that of a half-wave rectifier because it utilizes both halves of the input waveform, leading to a more consistent and powerful output.