This circuit was already assembled and tested use to automatic turn off radio / Stereo / CD player / Amplifier when no sound signal.

After radio / Stereo has no sound signal to the speaker within 15 minutes this board will shut down the stereo ( Hard shut down, no electrical current flow to the radio / Stereo, this is for safety power off , better than you set the timer in radio to turn off due to it is only soft shut down, still have small current flow. Please see below image how to connect.

Technical information:

- Require 12VDC Supply AC or DC current consume 40mA
- Automatic shut down if no sound signal in 15minutes
- 2 LED indicator to show power on / Sound signal presented
- [NO] relay 5A / 250VAC max
- Comes with the schematic diagram
- PCB size 7.3cm x 8.5cm