I've been toying around for a while with current source amps and I found some interesting threads when lurking around: https://www.diyaudio.com/community/threads/better-amp-configuration.108208/post-1298721
My idea is to combine that concept with a current source amplifier as the flea amp instead of a voltage amp. Basically use this topology (https://www.current-drive.info/9, https://www.current-drive.info/projects/45) but instead of having a modest -1.15x gain on the bridging amp to have say -10x gain.
If I've understood correctly I should be able to basically just take any off the shelf half bridge voltage amp with sufficient closed loop gain (I have a few 20x (26 dB) gain Class D amps lying around) and just hook up the following topology and it will just work?
I don't want to have to modify the bridge amplifier. I've done experiments where I've tried to wrap feedback loops around closed loop class D voltage amps but they have all been pretty unstable. If I as much breathe on them they starts to oscillate like crazy.
This topology would in theory be much more simple. No complex current feedback and I could even build the flea amp without feedback making it even more simple.
But will it work? The original amp is DC coupled, this on is capacitively coupled but should still work right? And if it should work, do the resistors seem appropriate? I just copied them from https://www.current-drive.info/projects/45 but adjusted the R1/R2 ratio to get a ratio of 10x gain instead of 1.15x.
My idea is to combine that concept with a current source amplifier as the flea amp instead of a voltage amp. Basically use this topology (https://www.current-drive.info/9, https://www.current-drive.info/projects/45) but instead of having a modest -1.15x gain on the bridging amp to have say -10x gain.
If I've understood correctly I should be able to basically just take any off the shelf half bridge voltage amp with sufficient closed loop gain (I have a few 20x (26 dB) gain Class D amps lying around) and just hook up the following topology and it will just work?
I don't want to have to modify the bridge amplifier. I've done experiments where I've tried to wrap feedback loops around closed loop class D voltage amps but they have all been pretty unstable. If I as much breathe on them they starts to oscillate like crazy.
This topology would in theory be much more simple. No complex current feedback and I could even build the flea amp without feedback making it even more simple.
But will it work? The original amp is DC coupled, this on is capacitively coupled but should still work right? And if it should work, do the resistors seem appropriate? I just copied them from https://www.current-drive.info/projects/45 but adjusted the R1/R2 ratio to get a ratio of 10x gain instead of 1.15x.