Boucherot cell

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A boucherot cell (named after Paul Boucherot) is a filter, typically consisting of a resistor and capacitor in series, that is usually placed across a load, for stability.

The Boucherot cell is commonly used in audio amplifiers to dampen out high frequency oscillations that might occur in the absence of loads at high frequencies. It usually consists of a series resistor-capacitor combination located directly at the output of the driver stage. Typical values are 5-10 ohms in series with 10 nano-Farad. The network limits the rising impedance of a loudspeaker at higher frequencies, due to the speaker coil inductance.

[edit] Typical uses of boucherot cells

The documentation for power op amps, such as L272, suggest the use of a "boucherot cell between outputs and ground or across the load".

Additionally, boucherot cells are sometimes used across the tweeter of a speaker system, in order to maintain a more constant driving point impedance as "seen" by a passive crossover. In this specific arrangement, the boucherot cell is sometimes also known as a Zobel network.