Fix audio-output to prevent RFI feedback.

README.md

@@ -55,7 +55,7 @@ Please find here the latest **[PCB Rev5 Assembly Manual CLICK HERE] by Manuel, D
 
 This modification consists of a few component changes and wires:
 - **To simplify things, 79 components are no longer needed** (and you could omit them on an unbuilt QCX): IC6-10,R11-40,43,55,R59-64,C1,5,8,C9-28,C31,C52-54,L1-3,D5,Q7,T1,JP1/DVM/FREQ.
-- **SDR receiver**: change R7,10(82k); C4,C7(1nF), remove R11,12,14,15,17,27,29,59,IC10; wire IC2(pin15) to IC10(pin1), insert 470R if you intend to use a headphones; C39(R27/R29 side) to IC5(pin1); C40(IC10 side) to IC5(pin7), and disconnect R50(5V side) and R52(5V side) and wire both to IC2(pin21). If you cannot wire C39,R50 then make the following Rev5 mods in addition: remove IC7, change R11(.1uF), C9(10k), R53(1k); wire 10k from R52(IC2-pin21 side) to IC7(pin5); wire R11 (C9 side) to R27(middle). If you want to build-up the original (analog) QCX receiver, you can skip this step and insert a SPDT switch between C21(+ side) and IC9(pin1) for CW and R27(pin2) for SSB (as was done in [original QCX-SSB modification]).
+- **SDR receiver**: change R7,10(82k); C4,C7(1nF), remove R11,12,14,15,17,27,29,59,IC10; place 10nF between IC10 pin 2 and pin 4; wire IC2(pin15) to IC10(pin1), insert 470R if you intend to use a headphones; wire C39(R27/R29 side) to IC5(pin1); C40(IC10 side) to IC5(pin7), and disconnect R50(5V side) and R52(5V side) and wire both to IC2(pin21). If you cannot wire C39,R50 then make the following Rev5 mods in addition: remove IC7, change R11(.1uF), C9(10k), R53(1k); wire 10k from R52(IC2-pin21 side) to IC7(pin5); wire R11 (C9 side) to R27(middle). If you want to build-up the original (analog) QCX receiver, you can skip this step and insert a SPDT switch between C21(+ side) and IC9(pin1) for CW and R27(pin2) for SSB (as was done in [original QCX-SSB modification]).
 - **SSB transmitter**: change D4,R56 (10k); R58 (.22uF); C32 (10uF), remove C31; wire IC2(pin21) to pin R57(side DVM-pin3); wire IC2(pin20) to DVM(pin2); wire IC2(pin18) to junction D4-C42-R58; install a microphone to tip (+ of electret) and sleeve GND of paddle-jack; PTT-switch to ring and sleeve ([X1M-mic]).
 - **Multiband support**: remove C1,5,8,R64,T1; at T1 landing pattern (see [QCX Assembly instruction] T1) install R (1k) over 6-8; R (1k) over 3-4; C (10nF) over 4-8; change C30 (30pF); L4 (1uH/16t); replace C25-28,L1-L3 with LPFs for different bands.
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