Raven Luni
- Oct 15, 2011
- 798
- Joined
- Oct 15, 2011
- Messages
- 798
I've come across this term when reading about amplifiers, never experienced it until recently, but cant find any in depth information about the phenomenon (or at least something that doesnt involve a de-railed conversation about b00bs - seriously...)
What causes this?
What the usual remedy?
What I have ruled out:
- Power supply noise
- Damaged power transistors
What I experience:
Very low frequency oscillations (from a few Hz to less than 1 Hz), square in shape, directly connected to the gain control (and this is where it gets weird / why I'm asking here). When the gain control reaches a certain point (going up), the oscillations start suddenly at their fastest but get slower as it continues to go up.
I dont have a recent diagram for you just yet but its basically a later version of this project. The main differences to note are that all the coupling capacitors are 22uF (low ESR), the 100uF across the drivers has been removed (made no difference)
What causes this?
What the usual remedy?
What I have ruled out:
- Power supply noise
- Damaged power transistors
What I experience:
Very low frequency oscillations (from a few Hz to less than 1 Hz), square in shape, directly connected to the gain control (and this is where it gets weird / why I'm asking here). When the gain control reaches a certain point (going up), the oscillations start suddenly at their fastest but get slower as it continues to go up.
I dont have a recent diagram for you just yet but its basically a later version of this project. The main differences to note are that all the coupling capacitors are 22uF (low ESR), the 100uF across the drivers has been removed (made no difference)