The CAD equitek e3002 multi-pattern condenser microphone

Description

The CAD equitek e300² combines a 1.1-inch 24K gold sputtered externally biased triple pattern (cardioid, omni, figure 8) dual diaphragm capsule with advanced elec­tronics. Typical FET (field effect transistor) condenser microphones use discrete designs. This means they use individual transistors that must be carefully matched for proper char­acteristics. Even with careful matching, discrete designs are in­herently non-linear. CAD equitek microphones use a different approach. We* do not use any discrete FETs. Instead, we use advanced high-speed OpAmps (Operational Amplifiers). These OpAmps are indi­vidually laser trimmed for optimum performance and have very high gain. This allows a large amount of negative feedback to be used to significantly reduce any non-linearity. During transients, these OpAmps may re­quire more current than typical phan­tom power supplies can deliver. The extra current demands are accommodated by our unique power supply design. Instead of using phantom power to operate the microphone, we use it to charge a pair of rechargeable batteries. This system provides a huge current reserve for the micro­phone’s electronics, yet there is no maintenance involved because the micro­phone automatically keeps the batteries charged during use. The use of OpAmps is not the only unique feature of equitek microphones. For example, we also supply servo cir­cuitry to minimize DC offset and eliminate interstage coupling capacitors. If using alkaline 9-volt batteries, do not apply phantom power to the microphone. Doing so could cause permanent damage to the microphone and void your warranty. NOTE: If you normally operate the microphone from phantom power, it is best to leave the micro­phone power switch in the ON position at all times. (The microphone auto­matically shuts off to conserve battery power when phantom power is removed.)