Please consider this DIY phono pre-amp.
The text states, that resistors R9 and R22 may be exchanged for potentiometers for gain control.
Since the circuit uses 1.2k? resistors for R9 and R22, I was wondering what kind of potentiometer I'd need. I was thinking of a logarithmic 10k? pot. However I'm not sure. In case there's a formula for computing this kind of resistance, please let me know.
The arrow "-VA" at IC1 (pin 4) should connect to the "-VA" point above C2, right? Likewise on the right channel.
The text states, that resistors R9 and R22 may be exchanged for potentiometers for gain control.
Since the circuit uses 1.2k? resistors for R9 and R22, I was wondering what kind of potentiometer I'd need. I was thinking of a logarithmic 10k? pot. However I'm not sure. In case there's a formula for computing this kind of resistance, please let me know.
The arrow "-VA" at IC1 (pin 4) should connect to the "-VA" point above C2, right? Likewise on the right channel.