1. - + PTT GREEN +12V YELLOW MIC (out) MIC RED PTT BLUE GND PTT GND RED
6800Ω - +
PTT
GND
RED
BLUE
board side
PTT button
lightblue
YELLOW
GREEN
MIC
+12V

4. MIC in 1u
560
BC547
8k2
BC547
47k
10k
470
8k2
3k3
10uH
33k

5. MIC gnd + to green connector via 10uH inductor 33uF 16V 6k8 0.1uF 10%
BC547
connects to yellow
BC547
BC547
47k
100p
4n7
47Ω
4n7 +
1uF
3k9
BC557
22Ω
10k
10uH
1k8
22Ω
GREEN
39u
light blue
YELLOW

6. 33u 16V C7 MICROPHONE 0.1/10/100 BC547 TS1 BC547 C8 TS2 BC547 TS6
560 R1
6k8
R16 c b e
0.1/10/100
BC547
TS1
8k2 R3
MICROPHONE c b e
BC547
TS2 C8
470 R4
10k R2 e b c
BC547
TS6
3k3 R5
BC557
TS5
0.33u C2
47k
R10
8k2 R6
10uH L1
BC547
TS3 e b c
BAW62
GR1 ak
47k
R13
10k R8 1u C3
47Ω R7 c b e 1u C5
33k R9
100p C9
3u3 C6
3k9
R12 c b e
22Ω
R15
10uH L2
22Ω
R14
39u C4
BC547
TS4
4n7
C10
1k8 R9
+12V
- via PTT
MIC OUT

7. light blue
GREEN
+12V
YELLOW
OUT
PTT
RED
BLUE
GND
MC1
microphone 1u C1
560 R1
10k R2
10u L1 L2
8k2 R3
470 R4
3k3 R5
0.33u C2 R6 47 R7 C3
1k8
R11 22
R15
3k9
R12
BAW62
GR1
47k
R13
R14 R8
3u3 C6 C5
BC547
TS1
TS2
TS3
BC557
TS5
TS4
TS6
33u 16V C7
100p C9
100n C8
6k8
R16
39u C4
4n7
C10
R10
33k R9
colors connection cable differ from original schematic

9.
A simple low-current voltage doubler may be built with the 7660 chip. A similar circuit can also be built with the more popular 74HC4053 chip as shown on the following drawing:
The 74HC4053 requires just a few capacitors and resistors to operate as a low-current (1mA) negative-voltage doubler. The first switch of the 74HC4053 is used as a non-inverting amplifier for the oscillator operating at around 70kHz. The second switch acts both as an inverting amplifier for the oscillator and as an output driver. Finally the third switch operates as a synchronous rectifier for the negative output voltage.

10. 4053 Voltage inverter computer USB +5V VDD GREEN +12V 3.5mm plug
RED
YELLOW
BLUE
GND
PTT
MIC (out)
MIC
VDD
3.5mm plug
computer in
4053
Voltage inverter
VEE (-5V)
VSS
3.5mm plug
computer gnd
computer USB GND
(do not connect)