Slotted Foil Capacitors

Slit Foil

Modern electrolytic capacitors are designed for use in power supplies so most aspects of their design have been optimised. Some of the advances in the design may not be beneficial in audio applications where the requirements of the capacitors are very different.

BHC, in collaboration with an audio research company, DNM Design, have produced the Slit Foil Capacitor specifically for audio applications. This is a  patented design which eliminates circulating currents in the aluminium foils. This spurious current flow on the capacitor plates is known to occur, but is not apparent in most applications.

Slit foil capacitor research has also indicated that improvements in the general construction of the capacitors give better results in audio where the fidelity of the wave shape is very important. Great attention has been paid to the construction details which can affect the performance, i.e. foil type, its connections and mechanical construction.

BHC manufacture a range of capacitors for this type of application in screw terminal, solder tag or snap-in configurations. Details of capacitance and case sizes available are available from our sales office and DNM Design.

T-Network

A new generation of audio capacitors are now available from BHC - T-Network Capacitor (TNC). The TNC has been designed specifically for audio applications by DNM Design and is manufactured in the UK by BHC.

In a normal capacitor unwanted resistance and inductance force the input and output together electrically, making its unwanted characteristics very critical for performance.

Figure.1. Conventional Capacitor:

The new TNC behaves differently because the input must flow along the capacitor plate to reach the output. The signal is forced into pure capacitance with most of the unwanted resistance and inductance appearing on each side of the bulk capacitance. The residual defects, therefore, tend to assist the capacitance filtering in the T-Network design.

Figure.2. T-Network Capacitor:

The TNC is designed for the most demanding filtering situations and it will redefine performance standards in many non-audio applications. For use in audio amplifiers, the TNC incorporates current slit foil technology to produce the ultimate audio capacitor. These capacitors give excellent results against standard components on a direct replacement.  However TNC high frequency performance is so enhanced that the  H.F. compensation of test amplifiers may need resetting for best results.

BHC manufacture a range of capacitors for this type of application in a 4 pin configuration. Details of capacitance and case sizes available are available from our sales office and DNM Design.

Download the T-Network Datasheet