Everyone has different taste, it's very subjective
Personally I don't like audiphile poetry ;-)
I like it and I'm happy that I built this little amplifier
But as always - the whole system and room acoustics play It's different for everyone
I don't have 4 Ohm speakers
I think it should be fine as long as you take care of a large heat sink and a suitable transformer
I built the amplifier according to the values recommended by minek123 so we have 400mA of quiescent current for each transistor. The power supply voltage is 16.9V so we have some heat to dissipate.
I just used a lot of things I already had
I used a recycled heat sink - from an old Denon amplifier (170 x 40 x 80mm) It's warm but not hot
I think you can calculate what heat sink we need.
I also have a transformer from an old project. Mine is 225VA.
I know it's too much but it works fine
I think a 2x12V 80VA -100VA transformer should be enough.
We won't be playing at full power all the time 🙂
10W per channel is really a lot. For everyday use, 2-3W is enough.
ok last silly question ... looking for a cost and size effective power solution ... ... AC 12v wall wort?
look at this
You need a real 2x12V transformer !
https://www.diyaudio.com/community/...mplifier-1-opamp-2-mosfet.416745/post-7773904
On the PCB you have a rectifier (4 diodes) and two filtering capacitors
YOU CANNOT CONNECT A DC POWER SUPPLY!
You need a 2x12V AC transformer!
It's dictated by opamp basically. That offset is very small, 0.2mV, so great 🙂
the voltage swing is limited by the op-amp (minus MOSFET voltage drop). so increasing voltage of output stage has no benefit.
for higher output have a look at lineup's sioux or cheppewa:
https://www.diyaudio.com/community/...att-opa453-with-diamond-buffer-output.417130/
https://www.diyaudio.com/community/threads/sioux-26-watt-opa552-with-diamond-buffer-output.417095/
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Thanks STV for the links.
I am affraid those other two design would not meet my expected distorsion and noise figures.
That is why I am interrested in this design. Are there simulated noise and distorsion data for the other two designs?
Line up, can I use OPA1611(can it deliver enough output current?)? What will be the phase margin?
Can I bridge the design with balanced signal in? And what will be the expected output power?
Sorry for the questions, you guys are great simulators and I can build and measure great stuff.
I am affraid those other two design would not meet my expected distorsion and noise figures.
That is why I am interrested in this design. Are there simulated noise and distorsion data for the other two designs?
Line up, can I use OPA1611(can it deliver enough output current?)? What will be the phase margin?
Can I bridge the design with balanced signal in? And what will be the expected output power?
Sorry for the questions, you guys are great simulators and I can build and measure great stuff.