Dynamics
How to choose the circuit capacitance
Source：http://hyskcn.cnRelease time：2015-08-31 09:54:28Views：Keywords：
capacitance
How to select circuit capacitors in audio circuits generally include filtering, coupling, bypass, frequency and other capacitors, how to more effectively select circuits using various types of capacitors for audio quality
Typically the audio circuit includes a filter, coupling, bypass, dividing capacitors, etc., how to more effectively select circuits using various types of capacitors having a large influence on the improvement of the sound quality.
1. The filter capacitor
Due to the large capacitance of the capacitor after the rectifier filter use, it must use electrolytic capacitors. Filter capacitor for the power amplifier, its value should be 10000μF above, when used in a preamplifier, a capacity of about 1000μF can.
When the power is supplied directly to the filter circuit amplifier, the greater its capacity, the better the sound quality. But large-capacity capacitor impedance will start to rise from the vicinity of 10KHz. At this time it should take several smaller capacitors in parallel capacitance should also be larger than a few film capacitors in parallel, next to the large capacitor to suppress the rise of high-frequency impedance, as shown in the following figure.
2. The coupling capacitor
Coupling capacitor capacity is generally between 0.1μF ~ 1μF, to use mica, acrylic, ceramics and other losses smaller capacitors sound better.
3. The pre-amplifier, crossover, etc.
Preamplifiers, audio controller, capacitors used on the divider, its capacity between 100pF ~ 0.1μF, and the speaker crossover network generally use LC capacity between 1μF ~ 10μF several large capacitance, the current high-end crossover CBB capacitor is used in the majority.
Mica should adopt when small capacity styrene capacitor. The LC capacitor network usage, the capacity is large, you should use metalized plastic film or non-polar electrolytic capacitor, wherein the inorganic electrolytic capacitors such as the use of non-etching formula, the better to get excellent sound quality.
