Kopfhörerverstärker WNA MKII

[FritzS]

Zuerst mal die unmodifizierten Originalschaltpläne des DIY Projekts.

Ein Kanal dargestellt:


Railsplitter



Modifikationen:

This parts I use:
C5, C6 Nichicon FG 100 uF, 25V
C11, C12 Nichicon KZ 220 uF, 25V
C7 Nichicon KZ 220 uF, 50V
C4 BlackGate NX 1000 uF 25V
C2, C3, C8, C9, C10 Evox Rifa PHE 450 0,1 uF / 250V (follower of PHE 428)
R11 (instead of lamp) 5 OHM Holco
instead of C1 - 1,02 kOHM Holco H4
IC1, IC2 Burson V6 Vivid (now) - in railsplitter LM6171
R4 = J2 Murata Ferrite bead
R1, R2, R3, R5, R6, R12, R13, R14 are Welwyn RC55Y 0.25W 0.1%
R7, R8, R9, R10 are Truohm 0.25W 0.1%
R12, R13, R14 are 0.6W 1% metal film
I1 3.5mA constant current diodes (CRD CurrentSource Semitec)
I2, I3, I4 5.6mA constant current diodes (CRD CurrentSource Semitec)
Potentiometer ALPS blue velvet 2x50 kOHM log. stereo

Currently there is no ZOBEL network, no additional 330 kOHM feedback.
Additional modification:
Bypass the Evox Rifa PHE 450 100nF (C2, C3) with WIMA FKP2 10nF/63V
and the Nichicon FG 100uF (C5, C6) with Evox Rifa PFR 220pF
This caps are mouted on rear side:



Bilder, da sind auch deutlich die beiden BlackGates Elkos (rot) und die beiden Burson V6 Vivid zu sehen: