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5
4
3
2
1
D
D
E
B
B
1
R15
100K
SW1
BRIGHT LEAD
U5-1
C6
0.022uF
R11
100K
C7
0.001
R9
470K
2
C8
0.022uF
R14
220K
U5-2
12AX7
U2-1
VR2
250K
6
R6
470K
1
7
U2-2
12AX7
2
VR1
500K
7
R13
330K
R16
1.8K
OI1A
C5
1uF
R10
1M
VTL5C1
C9
1uF
R12
39K
R19
330K
R18
47K
R20
680K
C11
0.022uF
VR5
500K
VR3
1M
4
R8
1.8K
3
8
12AX7
3
12AX7
R17
100K
8
R5
470K
C10
470pF
3
R7
100K
C4
0.001
6
C3
0.0022
C12
0.022uF
A
VR4
25K
3
E
A
R27
100K
R22
100K
R26
220K
U4-2
12AX7
C1
1uF
OI2A
3
2
R4
1.8K
R44
220K
R29
100K
8
12AX7
R1
1M
C16
470pF
1
8
U1-1
12AX7
R25
330K
3
VTL5C1
C15
0.1uF
R31
330K
U6-2
R30
47K
7
C17
0.022uF
4
R23
2.2K
R28
1.8K
VR7
250K
6
R24
680K
7
VR6
500K
R32
680K
OI4A
VR10
500K
U6-1
12AX7
8
R21
470K
12AX7
D
2
C14
0.022uF
7
1
C
3
2
4
U1-2
6
R2
68K
6
U4-1
J1
IN
OI3A
VTL5C1
1
SW2
BRIGHT CRUNCH
4
C13
470pF
1
R3
220K
C2
0.047uF
C
3
4
2
VR8
1M
12AX7
R46
82K
3
VTL5C1
C18
0.022uF
C25
0.1uF
J2
OUT
R43
470K
2
4
VR9
25K
R45
2.2K
R47
2.2K
1
C
C
SW3
BRIGHT CLEAN
B
R40
100K
R33
470K
R36
100K
C22
470pF
C21
120p
C20
0.022uF
R34
470K
U3-1
1
C19
470pF
B
6
U3-2
R38
2.2M
12AX7
7
12AX7
R39
330K
OI5A
VR15
1M
3
R35
39K
VR12
250K
R42
47K
2
VR11
500K
R41
2.2K
C23
0.022uF
3
8
VR13
1M
4
VTL5C1
R37
2.2K
C24
0.022uF
VR14
25K
A
A
Title
SOLDANO X88R
Size
C
Date:
5
4
3
2
Document Number
1
Rev
1
Friday, July 12, 2002
Sheet
1
1
of
1
5
4
3
2
1
D
D
D
R5
10K 2W
A
F1
1A SLO BLO
Hammond 269BX
2
SW1
POWER
D3-D6 MUR1100E
R2
1K 2W
C5
22uF 450V
B
D1
R3
1M
-
6
+
Vref
R1
150K 2W
150VAC
+
C1
47uF 450V
+
C2
47uF 450V
C
D2
R4
100K
8
9
1
+
R6
10K 2W
D3-D6
1
C
Filament reference supply
C4
22uF 450V
+432V
5
T1
150VAC
J1
AC PWR
3
D1, D2 1N5368B
+
R7
10K 2W
C3
+
C
4
100uF/100V
6.3VAC
+
C6
22uF 450V
+
C7
22uF 450V
R9
100
10
F6
F5
F4
F3
F2
F1
R8
10K 2W
Vref
E
D1 and D2 depend on how much voltage the transformer is
putting out and might not even be necessary The voltage
measurement on C1 should be less than its voltage rating by
around 18-20V. This measurement is taken without connecting
the B+ supplies to tubes, but with filaments wired and
connected.
R10
100
To minimize inductive coupling wire filaments in this order. F1 is the filament of V1
D3-D6 can be replaced with similar 1000V fast recovery
rectifiers
D7-D10
1N4007
SWITCH/INDICATION
POWER SUPPLY
U1
-
D11-D13 1N4148
+
LS1-LS3 - HASCO HS212 or similar
+5V
7805
C8
+
C9
LS1
+
LS2
4
4700uF 16V
D12
6
5
8
D13
6
6
7
1
2
All voltages for switching circuits are specified relative to their
floating ground. This floating ground should NOT be connected
to the signal ground.
3
5
8
7
B
4
3
5
8
D11
LS3
4
3
4700uF 16V
7
1
2
R12
390
1
2
R13
43
R15
390
R16
180
B
R17
43
R19
390
OI2A
VTL5C1
OI5A
TLP227
Footswitch capabilities can easily be added to this schematic by
putting a SPST switch before SW2 so that it could be turned off when
footswitch is enabled and wiring the gates of Q1-Q3 to a footswitch
connector. Alternatively a 4 position rotary channel switch can be
used with one position left unwired.
D14
CLEAN
OI4A
TLP227
R20
180
R21
43
OI1A
VTL5C1
D15
CRUNCH
OI3A
TLP227
D16
LEAD
SW2
D14-D16 are red LEDs w 4V voltage
drop and 25mA current rating
CHANNEL
Q1
2N7000
R11
47K
Q2
2N7000
Q3
2N7000
R14
47K
R18
47K
A
A
Title
X88R POWER SUPPLY, SWITCHING AND INDICATION
Size
C
Date:
5
4
3
2
Document Number
2
Rev
1
Tuesday, August 20, 2002
Sheet
1
1
of
1
A
B
C
D
E
REV:
Initial design: Randall Aiken
VCC
4
1
4
R1
CHANNEL INDICATORS
2
2
2
2
330
D1
D2
2
S1
CHANNEL1
1
2
SW SPST
4
3
R0
S0
6
7
R1
S1
S2
CHANNEL2
1
2
S3
CHANNEL3
1
R E SET LOGIC
2
SW SPST
VCC
TO AMPLIFIER SWITCHING LOGIC
1
J1
Q0
13
Q1
9
12
11
R2
S2
Q2
10
14
15
R3
S3
Q3
1
5
EN
NC
2
SW SPST
1
1
U1
3
Q3
2N7000
2
16
47K
VDD
47K
VSS
47K
Q2
2N7000
2
VCC
2
R4
2
R3
2
FOOTSWITCHES
R2
1
Q1
2N7000
1
1
1
SWITCH LATCHES
CHANNEL3
3
VCC
RED LED
CHANNEL2
1
VCC
CHANNEL1
3
VCC
D3
YELLOW LED
3
1
GREEN LED
CHANNEL1
CHANNEL2
CHANNEL3
VCC
1
2
3
4
5
3
(SELECTED CHANNEL HIGH,
ALL OTHERS LOW)
CON5
5-PIN DIN (MIDI) CABLE
R E COMMENDED
8
U2A
1
1
CD4044
3
D?
VCC
2
2
1
CD4081
1N4148
U2B
P O W E R - U P RESET
2
C?
0.1uF
5
4
6
CD4081
2
TYPICAL RELAY INTERFACE CIRCUIT
K1
U2C
8
2
6
10
4
9
8
CD4081
11
13
U2D
9
+ 5V
12
1
16
1
11
13
D4
CD4081
G5V-2-H-DC5
3
2
1N4148
Q4
2N7000
2
1
CHANNEL1
1
N O TES:
1
(1) ALL SWITCHES ARE MOMENTARY CONTACT SPST
AIKEN AMPLIFICATION
(2) VCC SUPPLY CAN RANGE FROM 5V TO 15V
1 0 8 3 6 C L E M S O N B L V D . . #208
S E N E C A , S C 2 9 678
F A X : 8 6 4 - 6 2 4 - 9 797
T E L: 864-624-9796
(3) OUTPUT CONTROL SIGNALS ARE CMOS-COMPATIBLE LEVELS
(CAN SOURCE/SINK AROUND 0.5mA MAX AT 5V).
(4) LED CURRENT LIMITING RESISTOR VALUE IS FOR 5V. IT MAY
NEED TO BE LARGER FOR HIGHER VCC VOLTAGES
(5) ALL PARTS AVAILABLE FROM DIGI-KEY (1-800-DIGIKEY)
Title
Size
Date:
A
B
C
D
3-CHANNEL FOOTSWITCH CONTROLLER
Document Number
Rev
A
Tuesday, June 22, 1999
Sheet
E
1
of