Barrett 2022 - Page 5

1 2 34
A B C D
4
321
D
C B A
R1 1K
R3 390K
R5
5K6
R7 10K
VPSU VPSU
C1 0U1
R2 1K
R6 24K R8 39K
VBatt
VBatt
312
2
5 4
U1A LM339-2
1
7 6
U1B LM339-2
14
9 8
U1C
LM339-2
13
11 10
U1D LM339-2
Battery switches out at 11V and stays latched until Mains returns or battery is replaced
PSU switches out at 10.5v PSU switches in at 11v
R13 15K
Vin
R10 15K
R11 1K
VPSU
+13V8 VBatt
R12 1K
VBatt
R14 1K
VBatt
R16 100K R17 100K
PSU+ PSU-
BATT-BBATT-G
D7 LED Green
GREEN RED
D9
HLMP-0800
D8 BAV70
Vin
U2 LM4040DIM3-50
U3
LM4040DIM3-50
R18 3K9
R19 82K
Q1 BSP17
C2 10U
C3
47U
Q3
2N7002
R4 10K
VPSU Q2
NDT456
D1 BAV70
C4
0U1
1 2 3 4 5 6
P1 CON6
Rear Panel
VBattVPSU+13V8
Speaker Control
VBatt VPSUVin
D2 BAV70
1 2
SPK1 CON2
1 2
SPK2 CON2
C5 0U1
R9 1K
Barrett 2022 Power Supply Front Panel Schematic Drawing No: 2022D02-A2
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