If you saw the end of my previous thread, you might know I am using this schematic:
To calculate the gain on this it is R3/R4. So for this, it would be 2000/200 = 2. It was suggested I use a 100R potentiometer which is a good idea because I can stop audio clipping with this by adjusting it if the volume is too loud.
The problem is, where I wanted to position my Arduino is out of reach and so using a pot would be difficult. I could run wires to and from the Arduino and place the pot somewhere else but it would be a lot of wire and it couldn't be easily moved around. I then thought - ok - how can I make this wireless? It occurred that I should use an IR remote with a receiver.
The main con is how am I supposed to adjust a pot with an IR pulse? I could use a servo to turn the pot but that's like a plan Z. I did a bit of research on it and found what's called a 'digital potentiometer'. Unfortunately, (looking on RS, Digikey, and Mouser) the lowest value of digital pot is 1K and RS was the only one selling a DIP package; all others were SMD - I need a 100R pot.
I looked around more but I couldn't find any lower than 1K. I also could not find a way to lower the value. It looks like the simple method of adding a resistor in parallel won't work.
What can I do to lower the value of this digital pot? Or is there a better approach to this?
FYI: here's the chip: https://uk.rs-online.com/web/p/digital-potentiometers/9215848/
Bod
To calculate the gain on this it is R3/R4. So for this, it would be 2000/200 = 2. It was suggested I use a 100R potentiometer which is a good idea because I can stop audio clipping with this by adjusting it if the volume is too loud.
The problem is, where I wanted to position my Arduino is out of reach and so using a pot would be difficult. I could run wires to and from the Arduino and place the pot somewhere else but it would be a lot of wire and it couldn't be easily moved around. I then thought - ok - how can I make this wireless? It occurred that I should use an IR remote with a receiver.
The main con is how am I supposed to adjust a pot with an IR pulse? I could use a servo to turn the pot but that's like a plan Z. I did a bit of research on it and found what's called a 'digital potentiometer'. Unfortunately, (looking on RS, Digikey, and Mouser) the lowest value of digital pot is 1K and RS was the only one selling a DIP package; all others were SMD - I need a 100R pot.
I looked around more but I couldn't find any lower than 1K. I also could not find a way to lower the value. It looks like the simple method of adding a resistor in parallel won't work.
What can I do to lower the value of this digital pot? Or is there a better approach to this?
FYI: here's the chip: https://uk.rs-online.com/web/p/digital-potentiometers/9215848/
Bod