DX blame + TMC improved

[dado]

Evo prijedloga za jednostavno, ali odlicno pojacalo.Sigurno ste mnogi culi za DX blame ST. To klasicno pojacalo s bootstrapped VASom. Ja sam pokusao izvuci malo vise iz tog pojacala pa sam napravio ugrade slijedeceg:1. Umjesto jednostavn Miller kompenzacije koristio sam TMC (Transient Miller Compensation).2. Promjenio sam malo CCS (constant current source)za diferencijalni ulazni par. Umjesto 100pF spojenih izmedju kolektora i baze Q1 tranzistora spojio sam 1nF izmeju baze i negativnog napajanja. to je smanjilo izoblicenja na visim frekvencijama.TMC je takodjer smanjio izoblicenja. To sam malo promjenio paralelnim spajanjem R24 od 200koma sa C22. Na taj nacin izbjegnut je grba kod opel loop gaina.U prilogu su slijedece fajle:DX-blame-ST-TMC-schematic PDF sema pojacalaPCB stampana plocica za foto postupakPCB mirror stampana plocica za izradu metodom laser printera i vruce peglePCB-pogled odozgo raspored elemenatajos su to FFT printovi za razne frekvencijeprmjer izoblicenja simulirao. Nemam odgovarajuce uredjaje za stvarno mjerenje izoblicenja. Mjerio samsa sinusnim signalom i cetvrtatim za razna opterecenja 1nF do 1uF paralelno s 8 ohma inije bilo osciliranja. Zavojnica paralelno 10 ohma na izlazu je dovoljna od 1uH.Uzivam i danas slusajuci ovo pojacalo.Fourier components of V(vout)DC component:-0.0910827Harmonic Frequency Fourier Normalized Phase Normalized Number [Hz] Component Component [degree] Phase [deg] 1 1.000e+03 1.378e+01 1.000e+00 -0.13° 0.00° 2 2.000e+03 1.319e-05 9.573e-07 92.93° 93.06° 3 3.000e+03 6.095e-06 4.423e-07 5.66° 5.80° 4 4.000e+03 1.097e-06 7.959e-08 90.62° 90.76° 5 5.000e+03 8.402e-07 6.096e-08 6.49° 6.62° 6 6.000e+03 4.986e-07 3.618e-08 83.08° 83.21° 7 7.000e+03 8.097e-07 5.875e-08 15.78° 15.91° 8 8.000e+03 2.516e-07 1.826e-08 55.72° 55.85° 9 9.000e+03 6.498e-07 4.715e-08 23.24° 23.38°Total Harmonic Distortion: 0.000106%Fourier components of V(vout)DC component:-0.0910831Harmonic Frequency Fourier Normalized Phase Normalized Number [Hz] Component Component [degree] Phase [deg] 1 1.000e+04 1.378e+01 1.000e+00 -1.32° 0.00° 2 2.000e+04 1.222e-05 8.872e-07 133.10° 134.42° 3 3.000e+04 8.633e-06 6.266e-07 41.58° 42.90° 4 4.000e+04 1.471e-06 1.067e-07 -122.33° -121.01° 5 5.000e+04 5.209e-06 3.780e-07 125.79° 127.12° 6 6.000e+04 2.563e-06 1.860e-07 -105.56° -104.23° 7 7.000e+04 1.469e-05 1.066e-06 138.49° 139.81° 8 8.000e+04 2.784e-06 2.021e-07 -102.15° -100.82° 9 9.000e+04 2.129e-05 1.545e-06 138.07° 139.39°Total Harmonic Distortion: 0.000222%Fourier components of V(vout)DC component:-0.0910939Harmonic Frequency Fourier Normalized Phase Normalized Number [Hz] Component Component [degree] Phase [deg] 1 2.000e+04 1.377e+01 1.000e+00 -2.65° 0.00° 2 4.000e+04 2.008e-05 1.458e-06 -172.01° -169.36° 3 6.000e+04 1.232e-05 8.950e-07 43.89° 46.53° 4 8.000e+04 9.964e-06 7.237e-07 -94.72° -92.07° 5 1.000e+05 2.182e-05 1.584e-06 98.94° 101.59° 6 1.200e+05 1.330e-05 9.660e-07 -102.93° -100.29° 7 1.400e+05 5.226e-05 3.796e-06 115.25° 117.90° 8 1.600e+05 1.319e-05 9.576e-07 -111.15° -108.50° 9 1.800e+05 7.341e-05 5.332e-06 112.36° 115.01°Total Harmonic Distortion: 0.000712%dado

DX-blame-st-TMC-schematic.pdf

PCB.pdf

PCB mirror.pdf

PCB-pogled odozgo.pdf

[Zen Mod]

nice:cheers: