relay based attenuator

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This is the initial drawing of the digital board, I guess this is pretty much standard.
First I opted for a PIC controller, but changed to Atmel after a tip from mcs 🙂
Still need to check the values for the resistors on both sides of the optocouplers 🙂
And there is no IR receiver connected, because I couldn't find the correct drawing for the component.

An externally hosted image should be here but it was not working when we last tested it.
 
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