Here is a muting circuit that provides about a 15 second mute delay during turn-on for the Grounded Grid Preamp or any audio device that has 12 volts DC available. The circuit draws only 60 mA at 12 VDC allowing it to be installed in most any component. The circuit board is prewired. All that is required is to mount the board and terminal strip with three components and wire it up. The device does not interfere with the audio signal at all. Upon shut down, the mute function operates immediately thereby preventing any transients as circuits power down. The device is recommended for use with solid state power amplifiers.