For RD100 AMP. from WOLF2, just to experiment (and because I have unused RD16 and RD100 transistors):
As I don’t need LPF here, just sawed it 
As I have had some unused parts for DDC/DUC transceiver, I was searching for some schemes I can assemble. Decided to assemble Wolf transceiver, partially (without filters/amp. part for the first time):
Transistors block to control relays on LPF:
PCBs to IC2 interface extender — PCA9555:
