reading on fivefishes blog something about there being a few mV of oscillationHere's my blog and go read ahead. FYI... this is like May of 2007, the SC-1 pre was just an idea on it's first prototype.
http://www.fivefish.net/diy/sc1/This is the development blog of my SC1.
Photo of first prototype.
As bad as this prototype looks, it can already do 100Khz!
On testing the VERY FIRST PROTOTYPE.. I had a part there where I mentioned .
Noticed some slight oscillation at the 5th, 6th, and 7th gain settings of the selector switch. So finally fixed that with additional bypass capacitors on the supply rails. We're talking about less than 0.2Volts oscillation on top of a 30Vpp output. So it's insignificant. But still, it's gone now.
As I said, this is Rev1.00 PCB I'm working on and it looks like on my Rev3.00 PCB, I've already incorporated those caps in the design.
Then connected the mic pre circuit output to the balanced line driver. And what do you know... the less than 0.2Volt oscillation fixed itself. The addtl caps weren't needed.
And then a few days later, I posted
VU meter readings are better... especially at the 11th and 12th position. Oscillation at the higher gain settings fixed too.
I am curious in fivefishes response to this statementMy comment.... if they're gonna comment about some oscillations I mentioned, man! READ THE ENTIRE STUPID BLOG and preferably have some READING COMPREHENSION. i.e. don't just pick and choose what I said one day and ignore what I posted later on... pick also the part where I said the problem was fixed during the later days. If you have ADHD, don't read my development blog. Just read the last page where everything is fixed, and ready for sale.
The whole blog is my daily diary of what's happening in the course of development and prototyping.