Hello,
If there is AVD supply and DVD supply (I suppose its DigitalVDD and AnalogVDD), how about GND pins? Isn't it better to connect some of them to 'digital' ground, and others to 'analog' one? If so, which ones?
Ground separation
Moderator: frank
Re: Ground separation
Ground is tied together in the chip so it doesn't matter. What is important is to have a good, solid ground plane.
Frank Thomson
Experimental Noize
Experimental Noize
Re: Ground separation
Ok. I have a problem with oscillations (?) of FV1. I've recorded it, could you listen?
https://files.fm/f/qxuajeg9n
It oscillates even without audio source connected, but I think it's not a preamp problem bacause if I switch to bypass (FV-1 is bypassed, only input preamp to output preamp) there's no oscillations. Previously, pins 7, 11, 19, 24 were connected to the digital ground, and pin 4 and 25 to the analog ground, but after your last answer I unsoldered all of the digital ground, leaving only pins 4 and 25 soldered to analog ground. It didn't solve the problem.
https://files.fm/f/qxuajeg9n
It oscillates even without audio source connected, but I think it's not a preamp problem bacause if I switch to bypass (FV-1 is bypassed, only input preamp to output preamp) there's no oscillations. Previously, pins 7, 11, 19, 24 were connected to the digital ground, and pin 4 and 25 to the analog ground, but after your last answer I unsoldered all of the digital ground, leaving only pins 4 and 25 soldered to analog ground. It didn't solve the problem.
Re: Ground separation
Reconnect the pins, I did not say to not connect them. That is very different from running separate planes.
Without schematics and PCB layout there is nothing I can comment on.
Without schematics and PCB layout there is nothing I can comment on.
Frank Thomson
Experimental Noize
Experimental Noize