I would like to build a volume attenuator circuit for my valve amp which will be controlled by an arduino. I have a circuit design thanks to this site
Audio Volume Relay Attenuator with IR Control
I understand how the attenuator works but need some help with the relay sequencing. How do I work out what relay should be on for a set value to give a -1db step volume control. I have a table which gives the voltage out from the attenuator for each db with a supply of 5v on the input. I have put this on a simulator and it could be worked out but with 60 steps this will take a long time. Is there an easier way to work this out? Any help will be appreciated.
Audio Volume Relay Attenuator with IR Control
I understand how the attenuator works but need some help with the relay sequencing. How do I work out what relay should be on for a set value to give a -1db step volume control. I have a table which gives the voltage out from the attenuator for each db with a supply of 5v on the input. I have put this on a simulator and it could be worked out but with 60 steps this will take a long time. Is there an easier way to work this out? Any help will be appreciated.
Thanks i did read through this and the other pages by Jos but being slow I missed the point that each relay represented the db table below the relay network. Its clear now they are connected in a bit formation and i understand how to use the calculator once this was understood. Just needed a push in the right direction. will need to look at programming code on an arduino now, thanks for the help
check this thread.
not relay based, but arduino driven, and very nicely executed.
not relay based, but arduino driven, and very nicely executed.
Cheers ElFishi that gives me another thread to read over. I hove gone through the other two threads and picked up some great help form them. Just ordered my MCP23008 8 bit expander to start practicing on the code. Already have a 16 arduino relay board for practicing. Looking forward to building this, i do like the look of MAXW and Olegsh.
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