Radio Design Labs (RDL) ST-GCA1 Automatic Audio Gain Control Amp
The ST-GCA1 Gain Control Amplifier constantly adjusts for changes in input levels; bringing up low levels, and reducing high levels. The ST-GCA1 is the ideal choice anywhere slowly varying audio levels such as music need to be maintained at a constant level. The slow gain-riding maintains the desired average operating levels without introducing any audible compression artifacts. Gating circuitry is used to mute the output when no input signal is present.

Functional Description: A wide range of line-level signals may be connected to the input. The gain of the ST-GCA product automatically adjusts to deliver a uniform output level at all times. The audio level is constantly adjusted to maintain the correct output. This normally slow AGC action is supplemented by a circuit which detects the amount of peak material present and speeds up the AGC correspondingly. The ST-GCA1 helps maintain good overall adjustment without impacting the overall dynamics of the program material. When audio is not present on the input, AGC searching is limited to about 5 seconds. During a sustained period without audio input, the ST-GCA outputs fade to a muted condition. When audio is next applied, the output instantly ramps up to the correct level.

24 Vdc power supply required, but not included. 

Pre-owned, but in excellent condition. Only slight wear on the screw terminals.