Simple Audio Frequency AF Speech processor

Description

Through a variety of experiments with nodes of coherent reception of radio is very convenient to use a low frequency amplifier with enhanced functionality. In receiving SSB signals requires a low-pass filter (LPF) with adjustable cut-off frequency (to suppress the "tails" from neighboring frequency radios), and for the reception of CW signals is very useful low-frequency bandpass filter (LBPF) at the frequency that provides the most comfortable tone for the operator (typically 650-750Hz, although some hams prefer the tone lower, for example, 500 and even 300 Hz, and others higher, e.g., 900 Hz). Skipping the CW signal through the cascaded LPF and LBPF, it is possible to significantly improve the selectivity of reception.
AF processor can be assembled as a separate, stand-alone device or include it as a unit into the homemade receiver or transceiver. Properly assembled device when the power supply begins to work immediately and in the infusion does not need.
The KIT consists of all necessary components for assembly.