Balanced Phono-Amps: An Extension to the 'The Sound of Silence' Editions
This e-book offers the layout, research and checking out of totally balanced RIAA phono amps and size instruments. The content material of this ebook extends a typical reference approximately RIAA phono amps “the sound of silence” via Burkhard Vogel. the following, the space is stuffed among a semi-balanced engine (RIAA Phono-Amp Engine I) and an absolutely balanced engine, the RIAA Phono-Amp Engine II. during this new publication available, “fully balanced” signifies that each one phono-amp degree leads to a balanced - or in different phrases symmetrical - resolution, differentially amplified. Un-balanced / single-ended ideas should not within the scope.
selected series is very beneficial in accordance with the overload query: ahead of the excessive frequencies (up to appr. +20 dB at 20 kHz) input the important Amps three or four they received damped by way of the seventy five µs lp to the max. a hundred mVrms point. furthermore, it damps noise from the linear enter Amps 1 & 2 too. i've got selected the Fig. 1.2 layout since it permits the RIAA move production with utmost precision and it fulﬁls the overload target in either sign paths. determine 1.3 exhibits an enter substitute with absolutely.
level elevated by means of the achieve of the third achieve degree (here, with equivalent Rs it’s two), therefore, en.o.tot turns into en:o:tot ¼ qﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ e2n:o:2nd G23rd þ e2n:o:3rd ð4:27Þ therefore, we receive Amp4’s enter referred noise voltage density en.i.tot as follows: en:i:tot ¼ 4.3.4 en:o:tot Gamp4 ð4:28Þ Noise and SN Calculations in keeping with Fig. 1.2 The calculation of the noise voltage of Amp4 on my own is senseless, so long as there are influential elements no longer taken into.
1 GT2 2 T2 Fig. 5.3 Bode plot of GT2(f) 10 three a hundred four 1 10 f [Hz] 4.2 T1 = 3180 s, T3 = 318 s : P4 five 1 10 1.438476 10 1 10 three C12 227.142857143 10 Fig. 5.4 T1 & T3 defining community Succ-apps of C12 & P4 may still usher in line the values of T1 & T3 with the mandatory RIAA community values: T3 C12 R35 RT1.eff T1 C12 3.08 R31 R35 T3 R32 P4 RT1.eff R33 1 R34 R1amp5 318 10 RT1.eff 1 R36 1 1 R2amp5 1 T1 R37 6 s 14.416 1 3.18 1 10 10 1 three s three 1 nine F [dB].
A( f) Ge.loss( R0) 75.005 SN ne.i.a 20 R1000 1 three 2 10 Hz 3180 10 1 R( f) 1 2 2 f 3180 10 1 B1 SN riaa.i( R0) 20 log three 6 1 6 1 1 2 three 2 10 Hz seventy five 10 2 R1000 2 6 f seventy five 10 6 R1000 2 s 20000Hz en.i.amp1( f R0) 2 R( f) 2 df 20Hz Ge.loss( R0) vi.nom SN riaa.i 20 1 B1 SN ariaa.i( R0) 20 log 9.898 s 2 s 2 s [dB(A)] s 2 s f 318 10 6 6 10 Hz 318 10 V df vi.nom 2 12 2 20Hz 1 10 1 737.9Hz 20000Hz 1 B1 SN ne.i.a( R0) df 1 1.259 A( f) 2.
Impedances, eg in Wz suggestions impedance enter impedance enter load impedance achieve of a triode µ-follower (also as subscript) Symbolises resource, eg R0 = resource resistance resource (subscript) Reference of a sound-programme point (here: zero dBV) Double-triode method one (subscript) Double-triode method (subscript), and so on. i/p load of five Ω (subscript) 10 Hz (subscript) i/p load of 20 Ω (subscript) 33 0.33 rpm (vinyl checklist) i/p load of forty Ω (subscript) i/p load of forty three Ω (subscript) forty five rpm (vinyl record).