EXF1 Circuit Kit

The EXF1 is a premium microphone circuit kit designed to give vintage character to electret capsules. Combine this circuit with our medium-diaphragm capsule to build a microphone with rich tonality, in an easy-to-build package. If you don't already have your own compatible donor mic body, you can buy an all-inclusive microphone kit with high-quality metalwork here; see the T-25 microphone kit. About the Audio Circuit The EXF1 uses a similar circuit design as our best-selling T-84 transformer coupled circuit kit. Both are based on the Neumann KM84. Both utilize custom-wound transformers that help give the circuit its sound. Both rely on manually, individually biased NOS JFETs that we include with each kit. The EXF1 is optimized for use with electret capsules, and was designed to be very easy to build — without compromising audio quality. See the many 5-star reviews on the T-25 product page.   Included In The EXF1 Kit Audio PCB (US-made, high quality, ENIG process, 2-layer) Transforme