(2) AMPLIFICADOR 2R COMPLETO LYNX-v3-0-QAG

R122/R123 calculation
This is how you calculate R122 and R123 (2W Zener resistors) @ Iz=20mA
(Rail Voltage–ZV)/0.02A=R (example with +/-55VDC Rail Voltage: (55-15)/0.02 = 40/0.02=2000R = 2K
How to make L101
Take app. 15 to 20 cm. of solid 1.5-2 mm thick insulated copper wire.
Carefully wrap the wire 10 times around a round object app. 8-10 mm in
diameter (e.g. a pencil). Make sure the windings are tight and pressed together.
Then carefully bend the ends to fit the 16mm hole distance on the PCB.
Cut the ends, and carefully remove 5mm of the insulating at each end.
Now carefully pull the coil of the object.
PCB pin-layout for transistors
TO-92
TO-126
TO-220AB
TO-3PBL
1=E 2=B 3=C
1=B 2=C 3=E
1=B 2=C 3=E
Q101, 102, 108, 109
Q103 to 107
Q110, 111
Q112 to 119
PCB Pin-layout for R114 Bias trimmer (Bourns are shown)
Pin configuration for Opamp
Pin 1, 5 and 8 has no connection on PCB
Fuse holder for 5x20mm fuse (both types can be fitted on the PCB)
5mm pin spacing (RS Components)
22.5mm pin spacing (Farnell)
Important correction to PCB silk screen!
Q106
This should have
stated
ECB
Q107
This should have
stated
ECB
No that this is only a correction to the silk screen. PCB tracks are correct and match the MJE340/350 transistors.
LYNX v3.0 Power Amplifier by Jan Dupont, Audio Circuit Denmark
www.audio-circuit.dk
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