Hi,
I'd like to add a SCART/RGB input to the RPi5 GPIO but am struggling a bit to work out exactly what's needed. This is what I'm planning:
Use an MCP3008 ADC for the R, G, B, Left Audio and Right Audio inputs. I think I need a 75ohm resistor to ground to provide the impedence expected by the output device. However I can't work out what I need for the audio lines which are 0.5V RMS. I think perhaps 1K.
The 100ohm resistors between the SCART lines and the ADC inputs are a rough guess.
I couldn't find a symbol for the adjustable version of the MCP1825 regulator, but it's capable of outputting 1V from a 3.3V input. I'm assuming this is needed rather than a simple voltage divider but it would be nice to do away with it if not.
Does this seem sensible? Perhaps there's a different, better approach altogether?
Thanks for any help!
I'd like to add a SCART/RGB input to the RPi5 GPIO but am struggling a bit to work out exactly what's needed. This is what I'm planning:
The 100ohm resistors between the SCART lines and the ADC inputs are a rough guess.
I couldn't find a symbol for the adjustable version of the MCP1825 regulator, but it's capable of outputting 1V from a 3.3V input. I'm assuming this is needed rather than a simple voltage divider but it would be nice to do away with it if not.
Does this seem sensible? Perhaps there's a different, better approach altogether?
Thanks for any help!
Statistics: Posted by Moocrow — Sat Aug 10, 2024 12:59 pm — Replies 3 — Views 45