Abstract: A communications receiver squelch circuit for use in frequency modulation systems which has tight squelch sensitivity. The squelch circuit includes two audio limiters and provides improved squelch sensitivity and squelch action that is independent of carrier modulation and significantly minimizes squelch clamping and squelch boost characteristics.
Abstract: A unitary retainer is disclosed for mounting and holding a printed circuit board onto a support panel, another printed circuit board or the like. A retaining channel receives a forward portion of a board inserted thereinto at a corner of the board. The channel locates a side edge of the board and clamps opposite faces of the board. A lead-in guides the board into the channel. A locking portion holds the board in the retainer.
Abstract: The invention is a controlled ferroresonant power supply with an improved feedback circuit resulting in improved output stability. The feedback circuit is responsive to the low voltage secondary output of the power supply to provide a variable output signal to activate the switch which controls the resonant winding circuit. The improved feedback circuit is responsive to the rectified AC low voltage secondary output for only a portion of its frequency period.