I wanted to hear an amplifier with current feedback, only gain 3 stages, negative second harmonic and a sound character like a single ended triode. Wanted a bit of power into 4r so I went with the pucks because of the higher power dissipation capability.
As power supplies I got some used 350w/48V meanwell smps.
I set them for 48v and the bias at 2.3a which brings the heatsinks(40x26x4cm) quite hot.
The amp can work from a single 40 to 60vdc power supply and it has a voltage gain of ~9.5x
For the moment I am using this schematic
Opto IC1 acts as a servo the keep the output of the amp at 1/2Vcc+2V.
I did some thd measurements into 4r
Higher output power is possible but you will need some serious heatsinking
Here it is looking shinny
There was some debugging to be done but everything was close to what the simulation shown.
Now it`s time for some tracks
As power supplies I got some used 350w/48V meanwell smps.
I set them for 48v and the bias at 2.3a which brings the heatsinks(40x26x4cm) quite hot.
The amp can work from a single 40 to 60vdc power supply and it has a voltage gain of ~9.5x
For the moment I am using this schematic
Opto IC1 acts as a servo the keep the output of the amp at 1/2Vcc+2V.
I did some thd measurements into 4r
Higher output power is possible but you will need some serious heatsinking
Here it is looking shinny
There was some debugging to be done but everything was close to what the simulation shown.
Now it`s time for some tracks
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