Does the buzz go away when the laptop is running on battery power?
Tom
Tom
Does the buzz go away when the laptop is running on battery power?
Tom
No. Actually the Modulus-86 is about 27-28 dB better than the Akitika based on the measurements shown for THD at 40 W (Modulus-86) and 53 W (Akitika).
Note that the graph for the Akitika is relative to 53 W, i.e. 0 dB on the graph is the voltage of the fundamental. The Modulus-86 measurement is in dBV. I.e. 0 dB on the graph is 1 V RMS. Thus, to compare the two graphs, subtract 25 dB from my measurement.
The result is:
Akitika THD: -97 dB (0.0014 %)
Modulus-86 THD: -124 dB (0.000061 %)
Tom
There's a price to pay for succeeding. It sounds like the nonstop teakettle whistle of tinnitus. That power level is not recommended for home use. You're on the fast track for that; but, is it needed? I do not know if that is needed. That way, you can find out when you have enough power. But, unfortunately, that's when you also find out not to use a concert power amplifier indoors.Oh, I'm reading! I've told several folks that I'll have the 200 W design ready this coming spring. I'm making good progress on clearing the road blocks that are in the way, so it's looking up.
200 W is the stretch goal. 150 W committed. I'm sure I can make 200 W happen in the simulator. The question is how much reality and physics will agree with me. The power dissipation in a 200 W class AB amp is not for the faint of heart. I will be wearing safety glasses during the initial testing!
Tom
There is certainly no lack of high power AB projects in the solid state forum. Heck, the forum is pushing a 150W/8r project on newbies with the honey badger.