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74-Series Chips
RU
EN
ES
Contents
Introduction
History: a computer from the catalogue
Lesson 0. Gates from transistors: for those who start from scratch
0.1. The idea: a transistor is a switch
0.2. Building
0.3. Check
Lesson 0 paste (Cmd+I)
Lesson 1. Logic in packages: 74HC00, 02, 04, 08, 32
1.1. The idea: a chip is a package with gates
1.2. The idea: free inputs go to ground
1.3. The idea: a latch from one chip
1.4. Building
1.5. Check
Lesson 1 paste (Cmd+I)
Lesson 2. Flip-flops in a package: 74HC74 and a frequency divider
2.1. The idea: a flip-flop with set and reset
2.2. The idea: six NANDs inside
2.3. The idea: a divider is a flip-flop that flips
2.4. Building
2.5. Check
Lesson 2 paste (Cmd+I)
Lesson 3. A counter in a package: 74HC390 and a stopwatch
3.1. The idea: ÷2 and ÷5 make ÷10
3.2. The idea: clocking on the fall
3.3. The idea: reset on a one
3.4. Building
3.5. Check
Lesson 3 paste (Cmd+I)
Lesson 4. A decoder in a package: 74HC138 and a running light
4.1. The idea: number → one wire
4.2. The idea: active 0
4.3. The idea: 4 → 16 from two 3 → 8
4.4. Building
4.5. Check
Lesson 4 paste (Cmd+I)
Lesson 5. A shift register: 74HC595 and 8 lamps over three wires
5.1. The idea: bits over one wire
5.2. The idea: a latch shows everything at once
5.3. The idea: the third state
5.4. Building
5.5. Check
Lesson 5 paste (Cmd+I)
Lesson 6. Bus buffers: 74HC244 and 74HC245
6.1. The idea: a bus and the third state
6.2. The idea: a buffer is a double inversion
6.3. The idea: both ways — two 74HC244
6.4. Building
6.5. Check
Lesson 6 paste (Cmd+I)
Lesson 7. An electronic dice
7.1. The idea: a counter to six
7.2. The idea: face number → dots
7.3. The idea: a fair roll
7.4. Building
7.5. Check
Lesson 7 paste (Cmd+I)
Summary
All the parts
Instructions in pictures
Instructions in pictures
Download PDF — the whole book
kh
HARDWARE BASICS
build kits · khanin.info
Building
instructions
HB-05
74-Series Chips
lessons 0–7 · twelve real chips from transistors
simulator: cs.khanin.info
© 2026 Daniil Khanin · khanin.info · HB-05
1
How to read these instructions
3
step number — follow strictly in order
AND
2×
6×
parts for this step: how many to place
AND
A
x
B
y
Y
z
a part with labels on its pins
CLK
CLK
labels with the same name are connected
A
Y
chip ports: input [ and output ]
DFF
blue frame — building a chip
CANVAS
grey tab — the main canvas
low
yellow ring — what has changed
remove a part together with its labels
2×
double-click a label — new name
3
chip built in the lesson with this number
check: this is how it should work
Keys
V
VCC (1)
G
GND (0)
N
transistor
I
switch
O
lamp
L
label
K
clock
U
button
[
port in
]
port out
Ctrl+G — into a chip
on a Mac Ctrl = Cmd
© 2026 Daniil Khanin · khanin.info · HB-05
2
A little history
1964
74 series
1972
Pong
1976
Apple I
1980s
74HC
now
you build it
In 1964 Texas Instruments released the 54/74 series: several gates in one package with pins.
The number told what was inside: 7400 — four NANDs, 7474 — two flip-flops, 7490 — a counter.
Arcade machines were built from such packages with no processor, and in 1976 Steve Wozniak built the Apple I:
a 6502 processor and around it a few dozen 74-series chips chosen from the catalogue.
In the 1980s came 74HC on CMOS: the same numbers and pins, pairs of P and N transistors inside.
Twelve such chips are what you build — with the same pin names as in the datasheet.
7400
7474
7490
74138
Texas Instruments, Apple, Pong are trademarks of their respective owners. This kit is not affiliated with or endorsed by them.
© 2026 Daniil Khanin · khanin.info · HB-05
3
0
Gates (optional)
NOT, NAND, NOR, AND, OR, XOR from transistors
kh
HB-05
NOT
NAND
NOR
AND
OR
XOR
IN
11×
OUT
6×
P
11×
N
11×
∞
Ctrl
+
G
NOT
NAND
NOR
AND
OR
XOR
© 2026 Daniil Khanin · khanin.info · HB-05
4
NOT
1
IN
1×
OUT
1×
P
1×
N
1×
6×
I0
O0
VCC
O0
G
P
I0
O0
GND
G
N
I0
2
Ctrl
+
G
Library
…
Chip N
2×
Library
…
NOT
Enter
NOT
I0
O0
© 2026 Daniil Khanin · khanin.info · HB-05
5
NAND
3
IN
2×
OUT
1×
P
2×
N
1×
9×
I0
I1
O0
VCC
O0
G
P
I0
VCC
O0
G
P
I1
O0
mid
G
N
I0
4
N
1×
3×
mid
GND
G
N
I1
5
Ctrl
+
G
Library
…
Chip N
2×
Library
…
NAND
Enter
NAND
I0
I1
O0
© 2026 Daniil Khanin · khanin.info · HB-05
6
NOR
6
IN
2×
OUT
1×
P
2×
N
1×
9×
I0
I1
O0
VCC
mid
G
P
I0
mid
O0
G
P
I1
O0
GND
G
N
I0
7
N
1×
3×
O0
GND
G
N
I1
8
Ctrl
+
G
Library
…
Chip N
2×
Library
…
NOR
Enter
NOR
I0
I1
O0
© 2026 Daniil Khanin · khanin.info · HB-05
7
AND
9
IN
2×
OUT
1×
P
2×
N
1×
9×
I0
I1
O0
VCC
n
G
P
I0
VCC
n
G
P
I1
n
mid
G
N
I0
10
N
2×
P
1×
9×
mid
GND
G
N
I1
VCC
O0
G
P
n
O0
GND
G
N
n
11
Ctrl
+
G
Library
…
Chip N
2×
Library
…
AND
Enter
AND
I0
I1
O0
© 2026 Daniil Khanin · khanin.info · HB-05
8
OR
12
IN
2×
OUT
1×
P
2×
N
1×
9×
I0
I1
O0
VCC
mid
G
P
I0
mid
n
G
P
I1
n
GND
G
N
I0
13
N
2×
P
1×
9×
n
GND
G
N
I1
VCC
O0
G
P
n
O0
GND
G
N
n
14
Ctrl
+
G
Library
…
Chip N
2×
Library
…
OR
Enter
OR
I0
I1
O0
© 2026 Daniil Khanin · khanin.info · HB-05
9
XOR
15
IN
2×
OUT
1×
OR
1×
NAND
1×
AND
1×
9×
I0
I1
O0
OR
I0
I0
I1
I1
O0
o
NAND
I0
I0
I1
I1
O0
n
AND
I0
o
I1
n
O0
O0
16
Ctrl
+
G
Library
…
Chip N
2×
Library
…
XOR
Enter
XOR
I0
I1
O0
© 2026 Daniil Khanin · khanin.info · HB-05
10
1
Logic in packages
74HC00, 02, 04, 08, 32 and an alarm built from them
kh
HB-05
74HC00
74HC02
74HC04
74HC08
74HC32
IN
38×
OUT
22×
NAND
4×
0
NOR
4×
0
NOT
6×
0
AND
4×
0
OR
4×
0
VCC
1×
GND
1×
0
3×
Q
Q
1×
2×
♪
1×
∞
Ctrl
+
G
74HC00
74HC02
74HC04
74HC08
74HC32
© 2026 Daniil Khanin · khanin.info · HB-05
11
CANVAS
74HC00
1
pin names as in the datasheet; a bar over a name in the picture = active 0, in the simulator without the bar
2
IN
8×
OUT
4×
1A
1B
2A
2B
3A
3B
4A
4B
1Y
2Y
3Y
4Y
3
NAND
3×
0
9×
NAND
I0
1A
I1
1B
O0
1Y
NAND
I0
2A
I1
2B
O0
2Y
NAND
I0
3A
I1
3B
O0
3Y
© 2026 Daniil Khanin · khanin.info · HB-05
12
74HC00 …
74HC02
4
NAND
1×
0
3×
NAND
I0
4A
I1
4B
O0
4Y
5
Ctrl
+
G
Library
…
Chip N
2×
Library
…
74HC00
Enter
74HC00
1A
1B
2A
2B
3A
3B
4A
4B
1Y
2Y
3Y
4Y
6
IN
8×
OUT
4×
1A
1B
2A
2B
3A
3B
4A
4B
1Y
2Y
3Y
4Y
7
NOR
3×
0
9×
NOR
I0
1A
I1
1B
O0
1Y
NOR
I0
2A
I1
2B
O0
2Y
NOR
I0
3A
I1
3B
O0
3Y
© 2026 Daniil Khanin · khanin.info · HB-05
13
74HC02 …
74HC04
8
NOR
1×
0
3×
NOR
I0
4A
I1
4B
O0
4Y
9
Ctrl
+
G
Library
…
Chip N
2×
Library
…
74HC02
Enter
74HC02
1A
1B
2A
2B
3A
3B
4A
4B
1Y
2Y
3Y
4Y
10
IN
6×
OUT
6×
1A
2A
3A
4A
5A
6A
1Y
2Y
3Y
4Y
5Y
6Y
11
NOT
3×
0
6×
NOT
I0
1A
O0
1Y
NOT
I0
2A
O0
2Y
NOT
I0
3A
O0
3Y
© 2026 Daniil Khanin · khanin.info · HB-05
14
74HC04 …
74HC08
12
NOT
3×
0
6×
NOT
I0
4A
O0
4Y
NOT
I0
5A
O0
5Y
NOT
I0
6A
O0
6Y
13
Ctrl
+
G
Library
…
Chip N
2×
Library
…
74HC04
Enter
74HC04
1A
2A
3A
4A
5A
6A
1Y
2Y
3Y
4Y
5Y
6Y
14
IN
8×
OUT
4×
1A
1B
2A
2B
3A
3B
4A
4B
1Y
2Y
3Y
4Y
© 2026 Daniil Khanin · khanin.info · HB-05
15
74HC08 …
74HC32
15
AND
3×
0
9×
AND
I0
1A
I1
1B
O0
1Y
AND
I0
2A
I1
2B
O0
2Y
AND
I0
3A
I1
3B
O0
3Y
16
AND
1×
0
3×
AND
I0
4A
I1
4B
O0
4Y
17
Ctrl
+
G
Library
…
Chip N
2×
Library
…
74HC08
Enter
74HC08
1A
1B
2A
2B
3A
3B
4A
4B
1Y
2Y
3Y
4Y
18
IN
8×
OUT
4×
1A
1B
2A
2B
3A
3B
4A
4B
1Y
2Y
3Y
4Y
© 2026 Daniil Khanin · khanin.info · HB-05
16
74HC32 …
CANVAS
19
OR
3×
0
9×
OR
I0
1A
I1
1B
O0
1Y
OR
I0
2A
I1
2B
O0
2Y
OR
I0
3A
I1
3B
O0
3Y
20
OR
1×
0
3×
OR
I0
4A
I1
4B
O0
4Y
21
Ctrl
+
G
Library
…
Chip N
2×
Library
…
74HC32
Enter
74HC32
1A
1B
2A
2B
3A
3B
4A
4B
1Y
2Y
3Y
4Y
22
free gate inputs in a package — to GND
© 2026 Daniil Khanin · khanin.info · HB-05
17
CANVAS …
23
VCC
1×
GND
1×
0
3×
5×
VCC
VCC
GND
GND
0
ARM
0
DOOR
0
WIN
24
Q
Q
1×
1×
Reset
Reset
RESET
25
74HC32
1×
9×
74HC32
1A
DOOR
1B
WIN
2A
GND
2B
GND
3A
GND
3B
GND
4A
GND
4B
GND
1Y
OPEN
2Y
3Y
4Y
26
74HC08
1×
9×
74HC08
1A
OPEN
1B
ARM
2A
GND
2B
GND
3A
GND
3B
GND
4A
GND
4B
GND
1Y
TRIP
2Y
3Y
4Y
27
74HC04
1×
8×
74HC04
1A
TRIP
2A
RESET
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nTRIP
2Y
nRESET
3Y
4Y
5Y
6Y
© 2026 Daniil Khanin · khanin.info · HB-05
18
CANVAS …
28
74HC00
1×
10×
74HC00
1A
nTRIP
1B
ALQN
2A
nRESET
2B
ALARM
3A
GND
3B
GND
4A
GND
4B
GND
1Y
ALARM
2Y
ALQN
3Y
4Y
29
74HC02
1×
9×
74HC02
1A
OPEN
1B
ALARM
2A
GND
2B
GND
3A
GND
3B
GND
4A
GND
4B
GND
1Y
READY
2Y
3Y
4Y
30
2×
2×
ALARM
READY
31
♪
1×
1×
ALARM
880
© 2026 Daniil Khanin · khanin.info · HB-05
19
CANVAS …
32
Speaker: on the left — «buzzer», the grille — 880
1
ARM
1
DOOR
ALARM
ARM = 1, DOOR = 1 → alarm
DOOR = 0 — the alarm stays
Reset — off
© 2026 Daniil Khanin · khanin.info · HB-05
20
2
Flip-flops: 74HC74
a frequency divider — the lamps blink slower and slower
kh
HB-05
74HC74
Q0
Q1
Q2
Q3
IN
11×
OUT
5×
P
3×
N
3×
Hz
1×
Q
Q
1×
74HC04
1×
1
5×
4b
0
A
1×
∞
Ctrl
+
G
NAND3
74HC74
© 2026 Daniil Khanin · khanin.info · HB-05
21
CANVAS
1
Delete
0
ARM
0
DOOR
0
WIN
Reset
Reset
RESET
ALARM
READY
ALARM
880
2
Delete
74HC32
1A
DOOR
1B
WIN
2A
GND
2B
GND
3A
GND
3B
GND
4A
GND
4B
GND
1Y
OPEN
2Y
3Y
4Y
74HC08
1A
OPEN
1B
ARM
2A
GND
2B
GND
3A
GND
3B
GND
4A
GND
4B
GND
1Y
TRIP
2Y
3Y
4Y
© 2026 Daniil Khanin · khanin.info · HB-05
22
CANVAS …
3
Delete
74HC04
1A
TRIP
2A
RESET
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nTRIP
2Y
nRESET
3Y
4Y
5Y
6Y
74HC00
1A
nTRIP
1B
ALQN
2A
nRESET
2B
ALARM
3A
GND
3B
GND
4A
GND
4B
GND
1Y
ALARM
2Y
ALQN
3Y
4Y
4
Delete
74HC02
1A
OPEN
1B
ALARM
2A
GND
2B
GND
3A
GND
3B
GND
4A
GND
4B
GND
1Y
READY
2Y
3Y
4Y
© 2026 Daniil Khanin · khanin.info · HB-05
23
NAND3
5
IN
3×
OUT
1×
P
3×
9×
A
B
C
Y
Y
VCC
G
P
A
Y
VCC
G
P
B
Y
VCC
G
P
C
6
N
3×
9×
Y
m1
G
N
A
m1
m2
G
N
B
m2
GND
G
N
C
7
Ctrl
+
G
Library
…
Chip N
2×
Library
…
NAND3
Enter
NAND3
A
B
C
Y
© 2026 Daniil Khanin · khanin.info · HB-05
24
74HC74
8
IN
8×
OUT
4×
1RD
1D
1CP
1SD
2SD
2CP
2D
2RD
1Q
1QN
2QN
2Q
9
NAND3
3×
12×
NAND3
A
1SD
B
1n4
C
1n2
Y
1n1
NAND3
A
1n1
B
1RD
C
1CP
Y
1n2
NAND3
A
1n2
B
1CP
C
1n4
Y
1n3
© 2026 Daniil Khanin · khanin.info · HB-05
25
74HC74 …
10
NAND3
3×
12×
NAND3
A
1n3
B
1RD
C
1D
Y
1n4
NAND3
A
1SD
B
1n2
C
1QN
Y
1Q
NAND3
A
1Q
B
1n3
C
1RD
Y
1QN
11
NAND3
3×
12×
NAND3
A
2SD
B
2n4
C
2n2
Y
2n1
NAND3
A
2n1
B
2RD
C
2CP
Y
2n2
NAND3
A
2n2
B
2CP
C
2n4
Y
2n3
© 2026 Daniil Khanin · khanin.info · HB-05
26
74HC74 …
12
NAND3
3×
12×
NAND3
A
2n3
B
2RD
C
2D
Y
2n4
NAND3
A
2SD
B
2n2
C
2QN
Y
2Q
NAND3
A
2Q
B
2n3
C
2RD
Y
2QN
13
Ctrl
+
G
Library
…
Chip N
2×
Library
…
74HC74
Enter
74HC74
1RD
1D
1CP
1SD
2SD
2CP
2D
2RD
1Q
1QN
2QN
2Q
© 2026 Daniil Khanin · khanin.info · HB-05
27
CANVAS
14
2
1Hz
2Hz
10Hz
60Hz
4kHz
…
MAX
15
Hz
1×
Q
Q
1×
2×
1Hz
CLK
Reset
Reset
CLR
16
74HC04
1×
1
7×
74HC04
1A
CLR
2A
GND
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nCLR
2Y
3Y
4Y
5Y
6Y
17
74HC74
1×
12×
74HC74
1RD
nCLR
1D
Q0N
1CP
CLK
1SD
VCC
2SD
VCC
2CP
Q0N
2D
Q1N
2RD
nCLR
1Q
Q0
1QN
Q0N
2QN
Q1N
2Q
Q1
18
74HC74
1×
12×
74HC74
1RD
nCLR
1D
Q2N
1CP
Q1N
1SD
VCC
2SD
VCC
2CP
Q2N
2D
Q3N
2RD
nCLR
1Q
Q2
1QN
Q2N
2QN
Q3N
2Q
Q3
© 2026 Daniil Khanin · khanin.info · HB-05
28
CANVAS …
19
5×
5×
CLK
Q0
Q1
Q2
Q3
20
4b
0
A
1×
4b
0
Q
Q0
Q1
Q2
Q3
Q3 Q2 Q1 Q0 = 0101 → 5
© 2026 Daniil Khanin · khanin.info · HB-05
29
3
Counter: 74HC390
and 74HC86 — a stopwatch 00–99
kh
HB-05
74HC86
74HC390
42
IN
14×
OUT
12×
XOR
4×
0
74HC04
1×
1
74HC02
1×
1
74HC08
2×
1
74HC74
4×
2
Hz
1×
0
1×
Q
Q
1×
4b
0
A
2×
1×
∞
Ctrl
+
G
74HC86
74HC390
© 2026 Daniil Khanin · khanin.info · HB-05
30
CANVAS
1
Delete
1Hz
CLK
Reset
Reset
CLR
CLK
Q0
Q1
Q2
Q3
4b
0
Q
2
Delete
74HC04
1A
CLR
2A
GND
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nCLR
2Y
3Y
4Y
5Y
6Y
74HC74
1RD
nCLR
1D
Q0N
1CP
CLK
1SD
VCC
2SD
VCC
2CP
Q0N
2D
Q1N
2RD
nCLR
1Q
Q0
1QN
Q0N
2QN
Q1N
2Q
Q1
3
Delete
74HC74
1RD
nCLR
1D
Q2N
1CP
Q1N
1SD
VCC
2SD
VCC
2CP
Q2N
2D
Q3N
2RD
nCLR
1Q
Q2
1QN
Q2N
2QN
Q3N
2Q
Q3
© 2026 Daniil Khanin · khanin.info · HB-05
31
74HC86
4
IN
8×
OUT
4×
1A
1B
2A
2B
3A
3B
4A
4B
1Y
2Y
3Y
4Y
5
XOR
3×
0
9×
XOR
I0
1A
I1
1B
O0
1Y
XOR
I0
2A
I1
2B
O0
2Y
XOR
I0
3A
I1
3B
O0
3Y
6
XOR
1×
0
3×
XOR
I0
4A
I1
4B
O0
4Y
7
Ctrl
+
G
Library
…
Chip N
2×
Library
…
74HC86
Enter
74HC86
1A
1B
2A
2B
3A
3B
4A
4B
1Y
2Y
3Y
4Y
© 2026 Daniil Khanin · khanin.info · HB-05
32
74HC390
8
IN
6×
OUT
8×
1CP0
1MR
1CP1
2CP1
2MR
2CP0
1Q0
1Q1
1Q2
1Q3
2Q3
2Q2
2Q1
2Q0
9
74HC04
1×
1
12×
74HC04
1A
1CP0
2A
1CP1
3A
1MR
4A
2CP0
5A
2CP1
6A
2MR
1Y
1c0
2Y
1c1
3Y
1nMR
4Y
2c0
5Y
2c1
6Y
2nMR
10
74HC02
1×
1
10×
74HC02
1A
1Q1
1B
1Q3
2A
2Q1
2B
2Q3
3A
GND
3B
GND
4A
GND
4B
GND
1Y
1d1
2Y
2d1
3Y
4Y
© 2026 Daniil Khanin · khanin.info · HB-05
33
74HC390 …
11
74HC08
1×
1
10×
74HC08
1A
1Q1
1B
1Q2
2A
2Q1
2B
2Q2
3A
GND
3B
GND
4A
GND
4B
GND
1Y
1d3
2Y
2d3
3Y
4Y
12
74HC86
1×
10×
74HC86
1A
1Q1
1B
1Q2
2A
2Q1
2B
2Q2
3A
GND
3B
GND
4A
GND
4B
GND
1Y
1d2
2Y
2d2
3Y
4Y
13
74HC74
1×
2
12×
74HC74
1RD
1nMR
1D
1Q0N
1CP
1c0
1SD
VCC
2SD
VCC
2CP
1c1
2D
1d1
2RD
1nMR
1Q
1Q0
1QN
1Q0N
2QN
1Q1N
2Q
1Q1
© 2026 Daniil Khanin · khanin.info · HB-05
34
74HC390 …
14
74HC74
1×
2
12×
74HC74
1RD
1nMR
1D
1d2
1CP
1c1
1SD
VCC
2SD
VCC
2CP
1c1
2D
1d3
2RD
1nMR
1Q
1Q2
1QN
1Q2N
2QN
1Q3N
2Q
1Q3
15
74HC74
1×
2
12×
74HC74
1RD
2nMR
1D
2Q0N
1CP
2c0
1SD
VCC
2SD
VCC
2CP
2c1
2D
2d1
2RD
2nMR
1Q
2Q0
1QN
2Q0N
2QN
2Q1N
2Q
2Q1
16
74HC74
1×
2
12×
74HC74
1RD
2nMR
1D
2d2
1CP
2c1
1SD
VCC
2SD
VCC
2CP
2c1
2D
2d3
2RD
2nMR
1Q
2Q2
1QN
2Q2N
2QN
2Q3N
2Q
2Q3
17
Ctrl
+
G
Library
…
Chip N
2×
Library
…
74HC390
Enter
74HC390
1CP0
1MR
1CP1
2CP1
2MR
2CP0
1Q0
1Q1
1Q2
1Q3
2Q3
2Q2
2Q1
2Q0
© 2026 Daniil Khanin · khanin.info · HB-05
35
CANVAS
18
1
1Hz
2Hz
10Hz
60Hz
4kHz
…
MAX
19
Hz
1×
0
1×
Q
Q
1×
3×
1Hz
CLK
0
RUN
Reset
Reset
RST
20
74HC08
1×
1
9×
74HC08
1A
CLK
1B
RUN
2A
GND
2B
GND
3A
GND
3B
GND
4A
GND
4B
GND
1Y
TICK
2Y
3Y
4Y
21
74HC390
1×
14×
74HC390
1CP0
TICK
1MR
RST
1CP1
U0
2CP1
T0
2MR
RST
2CP0
U3
1Q0
U0
1Q1
U1
1Q2
U2
1Q3
U3
2Q3
T3
2Q2
T2
2Q1
T1
2Q0
T0
© 2026 Daniil Khanin · khanin.info · HB-05
36
CANVAS …
22
4b
0
A
2×
1×
1×
4b
0
T
4b
0
U
TICK
1
RUN
RUN = 1: 00 → 99
© 2026 Daniil Khanin · khanin.info · HB-05
37
4
Decoder: 74HC138
a running light on 16 lamps
kh
HB-05
74HC138
L0
L1
L2
L3
L4
L5
L6
L7
IN
6×
OUT
8×
74HC04
2×
1
74HC08
2×
1
74HC00
2×
1
Hz
1×
Q
Q
1×
74HC74
2×
2
16×
∞
Ctrl
+
G
74HC138
© 2026 Daniil Khanin · khanin.info · HB-05
38
CANVAS
1
Delete
1Hz
CLK
0
RUN
Reset
Reset
RST
4b
0
T
4b
0
U
TICK
2
Delete
74HC08
1A
CLK
1B
RUN
2A
GND
2B
GND
3A
GND
3B
GND
4A
GND
4B
GND
1Y
TICK
2Y
3Y
4Y
74HC390
1CP0
TICK
1MR
RST
1CP1
U0
2CP1
T0
2MR
RST
2CP0
U3
1Q0
U0
1Q1
U1
1Q2
U2
1Q3
U3
2Q3
T3
2Q2
T2
2Q1
T1
2Q0
T0
© 2026 Daniil Khanin · khanin.info · HB-05
39
74HC138
3
IN
6×
OUT
8×
A0
A1
A2
E1
E2
E3
Y7
Y6
Y5
Y4
Y3
Y2
Y1
Y0
4
74HC04
1×
1
11×
74HC04
1A
A0
2A
A1
3A
A2
4A
E1
5A
E2
6A
GND
1Y
nA0
2Y
nA1
3Y
nA2
4Y
nE1
5Y
nE2
6Y
5
74HC08
1×
1
12×
74HC08
1A
nA1
1B
nA0
2A
nA1
2B
A0
3A
A1
3B
nA0
4A
A1
4B
A0
1Y
t0
2Y
t1
3Y
t2
4Y
t3
© 2026 Daniil Khanin · khanin.info · HB-05
40
74HC138 …
6
74HC08
1×
1
12×
74HC08
1A
nE1
1B
nE2
2A
g
2B
E3
3A
G
3B
nA2
4A
G
4B
A2
1Y
g
2Y
G
3Y
G0
4Y
G1
7
74HC00
1×
1
12×
74HC00
1A
G0
1B
t0
2A
G0
2B
t1
3A
G0
3B
t2
4A
G0
4B
t3
1Y
Y0
2Y
Y1
3Y
Y2
4Y
Y3
8
74HC00
1×
1
12×
74HC00
1A
G1
1B
t0
2A
G1
2B
t1
3A
G1
3B
t2
4A
G1
4B
t3
1Y
Y4
2Y
Y5
3Y
Y6
4Y
Y7
9
Ctrl
+
G
Library
…
Chip N
2×
Library
…
74HC138
Enter
74HC138
A0
A1
A2
E1
E2
E3
Y7
Y6
Y5
Y4
Y3
Y2
Y1
Y0
© 2026 Daniil Khanin · khanin.info · HB-05
41
CANVAS
10
2
1Hz
2Hz
10Hz
60Hz
4kHz
…
MAX
11
Hz
1×
Q
Q
1×
2×
1Hz
CLK
Reset
Reset
CLR
12
74HC04
1×
1
7×
74HC04
1A
CLR
2A
GND
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nCLR
2Y
3Y
4Y
5Y
6Y
13
74HC74
1×
2
12×
74HC74
1RD
nCLR
1D
Q0N
1CP
CLK
1SD
VCC
2SD
VCC
2CP
Q0N
2D
Q1N
2RD
nCLR
1Q
Q0
1QN
Q0N
2QN
Q1N
2Q
Q1
14
74HC74
1×
2
12×
74HC74
1RD
nCLR
1D
Q2N
1CP
Q1N
1SD
VCC
2SD
VCC
2CP
Q2N
2D
Q3N
2RD
nCLR
1Q
Q2
1QN
Q2N
2QN
Q3N
2Q
Q3
© 2026 Daniil Khanin · khanin.info · HB-05
42
CANVAS …
15
74HC138
1×
14×
74HC138
A0
Q0
A1
Q1
A2
Q2
E1
Q3
E2
GND
E3
VCC
Y7
L7
Y6
L6
Y5
L5
Y4
L4
Y3
L3
Y2
L2
Y1
L1
Y0
L0
16
74HC138
1×
14×
74HC138
A0
Q0
A1
Q1
A2
Q2
E1
GND
E2
GND
E3
Q3
Y7
L15
Y6
L14
Y5
L13
Y4
L12
Y3
L11
Y2
L10
Y1
L9
Y0
L8
17
5×
5×
L0
L1
L2
L3
L4
18
5×
5×
L5
L6
L7
L8
L9
© 2026 Daniil Khanin · khanin.info · HB-05
43
CANVAS …
19
5×
5×
L10
L11
L12
L13
L14
20
1×
1×
L15
L0
L1
L2
L3
L4
L5
L6
L7
a "shadow" runs: one lamp goes out
© 2026 Daniil Khanin · khanin.info · HB-05
44
5
Shift register: 74HC595
8 lamps over three wires
kh
HB-05
74HC595
L7
L6
L5
L4
L3
L2
L1
L0
IN
5×
OUT
9×
74HC74
8×
2
74HC04
2×
1
TG
8×
0
2×
Q
Q
3×
8×
9×
∞
Ctrl
+
G
74HC595
© 2026 Daniil Khanin · khanin.info · HB-05
45
CANVAS
1
Delete
1Hz
CLK
Reset
Reset
CLR
L0
L1
L2
L3
L4
L5
L6
2
Delete
L7
L8
L9
L10
L11
L12
L13
L14
L15
3
Delete
74HC04
1A
CLR
2A
GND
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nCLR
2Y
3Y
4Y
5Y
6Y
74HC74
1RD
nCLR
1D
Q0N
1CP
CLK
1SD
VCC
2SD
VCC
2CP
Q0N
2D
Q1N
2RD
nCLR
1Q
Q0
1QN
Q0N
2QN
Q1N
2Q
Q1
© 2026 Daniil Khanin · khanin.info · HB-05
46
CANVAS …
4
Delete
74HC74
1RD
nCLR
1D
Q2N
1CP
Q1N
1SD
VCC
2SD
VCC
2CP
Q2N
2D
Q3N
2RD
nCLR
1Q
Q2
1QN
Q2N
2QN
Q3N
2Q
Q3
74HC138
A0
Q0
A1
Q1
A2
Q2
E1
Q3
E2
GND
E3
VCC
Y7
L7
Y6
L6
Y5
L5
Y4
L4
Y3
L3
Y2
L2
Y1
L1
Y0
L0
5
Delete
74HC138
A0
Q0
A1
Q1
A2
Q2
E1
GND
E2
GND
E3
Q3
Y7
L15
Y6
L14
Y5
L13
Y4
L12
Y3
L11
Y2
L10
Y1
L9
Y0
L8
© 2026 Daniil Khanin · khanin.info · HB-05
47
74HC595
6
IN
5×
OUT
9×
MR
SHCP
STCP
OE
DS
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q0
Q7S ← s7
7
74HC74
1×
2
12×
74HC74
1RD
MR
1D
DS
1CP
SHCP
1SD
VCC
2SD
VCC
2CP
SHCP
2D
s0
2RD
MR
1Q
s0
1QN
sn0
2QN
sn1
2Q
s1
8
74HC74
1×
2
12×
74HC74
1RD
MR
1D
s1
1CP
SHCP
1SD
VCC
2SD
VCC
2CP
SHCP
2D
s2
2RD
MR
1Q
s2
1QN
sn2
2QN
sn3
2Q
s3
© 2026 Daniil Khanin · khanin.info · HB-05
48
74HC595 …
9
74HC74
1×
2
12×
74HC74
1RD
MR
1D
s3
1CP
SHCP
1SD
VCC
2SD
VCC
2CP
SHCP
2D
s4
2RD
MR
1Q
s4
1QN
sn4
2QN
sn5
2Q
s5
10
74HC74
1×
2
12×
74HC74
1RD
MR
1D
s5
1CP
SHCP
1SD
VCC
2SD
VCC
2CP
SHCP
2D
s6
2RD
MR
1Q
s6
1QN
sn6
2QN
sn7
2Q
s7
11
74HC74
1×
2
12×
74HC74
1RD
VCC
1D
s0
1CP
STCP
1SD
VCC
2SD
VCC
2CP
STCP
2D
s1
2RD
VCC
1Q
r0
1QN
rn0
2QN
rn1
2Q
r1
© 2026 Daniil Khanin · khanin.info · HB-05
49
74HC595 …
12
74HC74
1×
2
12×
74HC74
1RD
VCC
1D
s2
1CP
STCP
1SD
VCC
2SD
VCC
2CP
STCP
2D
s3
2RD
VCC
1Q
r2
1QN
rn2
2QN
rn3
2Q
r3
13
74HC74
1×
2
12×
74HC74
1RD
VCC
1D
s4
1CP
STCP
1SD
VCC
2SD
VCC
2CP
STCP
2D
s5
2RD
VCC
1Q
r4
1QN
rn4
2QN
rn5
2Q
r5
14
74HC74
1×
2
12×
74HC74
1RD
VCC
1D
s6
1CP
STCP
1SD
VCC
2SD
VCC
2CP
STCP
2D
s7
2RD
VCC
1Q
r6
1QN
rn6
2QN
rn7
2Q
r7
© 2026 Daniil Khanin · khanin.info · HB-05
50
74HC595 …
15
74HC04
1×
1
TG
1×
10×
74HC04
1A
OE
2A
GND
3A
GND
4A
GND
5A
GND
6A
GND
1Y
en
2Y
3Y
4Y
5Y
6Y
Transmission gate
A
r0
EN
en
B
Q0
16
TG
3×
9×
Transmission gate
A
r1
EN
en
B
Q1
Transmission gate
A
r2
EN
en
B
Q2
Transmission gate
A
r3
EN
en
B
Q3
© 2026 Daniil Khanin · khanin.info · HB-05
51
74HC595 …
17
TG
3×
9×
Transmission gate
A
r4
EN
en
B
Q4
Transmission gate
A
r5
EN
en
B
Q5
Transmission gate
A
r6
EN
en
B
Q6
18
TG
1×
3×
Transmission gate
A
r7
EN
en
B
Q7
© 2026 Daniil Khanin · khanin.info · HB-05
52
74HC595 …
CANVAS
19
Ctrl
+
G
Library
…
Chip N
2×
Library
…
74HC595
Enter
74HC595
MR
SHCP
STCP
OE
DS
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q0
Q7S
20
0
2×
Q
Q
3×
5×
0
DATA
Shift
Shift
SH
Latch
Latch
ST
Clear
Clear
CLRB
0
OFF
21
74HC04
1×
1
7×
74HC04
1A
CLRB
2A
GND
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nCLRB
2Y
3Y
4Y
5Y
6Y
© 2026 Daniil Khanin · khanin.info · HB-05
53
CANVAS …
22
74HC595
1×
14×
74HC595
MR
nCLRB
SHCP
SH
STCP
ST
OE
OFF
DS
DATA
Q1
L1
Q2
L2
Q3
L3
Q4
L4
Q5
L5
Q6
L6
Q7
L7
Q0
L0
Q7S
SO
© 2026 Daniil Khanin · khanin.info · HB-05
54
CANVAS …
23
3×
6×
L0
GND
L1
GND
L2
GND
24
3×
6×
L3
GND
L4
GND
L5
GND
25
2×
4×
L6
GND
L7
GND
26
5×
5×
L0
L1
L2
L3
L4
27
4×
4×
L5
L6
L7
SO
L7
L6
L5
L4
L3
L2
L1
L0
1011 0010 → Latch
© 2026 Daniil Khanin · khanin.info · HB-05
55
6
Bus buffers
74HC244 and 74HC245: shared wires — only one talks
kh
HB-05
74HC244
74HC245
IN
20×
OUT
16×
74HC04
5×
1
TG
8×
74HC00
1×
1
0
15×
74HC32
1×
1
16×
4b
0
A
1×
4×
∞
Ctrl
+
G
74HC244
74HC245
© 2026 Daniil Khanin · khanin.info · HB-05
56
CANVAS
1
Delete
0
DATA
Shift
Shift
SH
Latch
Latch
ST
Clear
Clear
CLRB
0
OFF
L0
GND
L1
GND
L2
GND
L3
GND
2
Delete
L4
GND
L5
GND
L6
GND
L7
GND
L0
L1
L2
L3
L4
© 2026 Daniil Khanin · khanin.info · HB-05
57
CANVAS …
3
Delete
L5
L6
L7
SO
4
Delete
74HC04
1A
CLRB
2A
GND
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nCLRB
2Y
3Y
4Y
5Y
6Y
74HC595
MR
nCLRB
SHCP
SH
STCP
ST
OE
OFF
DS
DATA
Q1
L1
Q2
L2
Q3
L3
Q4
L4
Q5
L5
Q6
L6
Q7
L7
Q0
L0
Q7S
SO
© 2026 Daniil Khanin · khanin.info · HB-05
58
74HC244
5
IN
10×
OUT
8×
1OE
1A0
1A1
1A2
1A3
2A3
2A2
2A1
2A0
2OE
2Y0
2Y1
2Y2
2Y3
1Y3
1Y2
1Y1
1Y0
6
74HC04
1×
1
12×
74HC04
1A
1A0
2A
1A1
3A
1A2
4A
1A3
5A
2A0
6A
2A1
1Y
n1A0
2Y
n1A1
3Y
n1A2
4Y
n1A3
5Y
n2A0
6Y
n2A1
7
74HC04
1×
1
12×
74HC04
1A
2A2
2A
2A3
3A
n1A0
4A
n1A1
5A
n1A2
6A
n1A3
1Y
n2A2
2Y
n2A3
3Y
b1A0
4Y
b1A1
5Y
b1A2
6Y
b1A3
8
74HC04
1×
1
12×
74HC04
1A
n2A0
2A
n2A1
3A
n2A2
4A
n2A3
5A
1OE
6A
2OE
1Y
b2A0
2Y
b2A1
3Y
b2A2
4Y
b2A3
5Y
e1
6Y
e2
© 2026 Daniil Khanin · khanin.info · HB-05
59
74HC244 …
9
TG
3×
9×
Transmission gate
A
b1A0
EN
e1
B
1Y0
Transmission gate
A
b1A1
EN
e1
B
1Y1
Transmission gate
A
b1A2
EN
e1
B
1Y2
10
TG
3×
9×
Transmission gate
A
b1A3
EN
e1
B
1Y3
Transmission gate
A
b2A0
EN
e2
B
2Y0
Transmission gate
A
b2A1
EN
e2
B
2Y1
© 2026 Daniil Khanin · khanin.info · HB-05
60
74HC244 …
11
TG
2×
6×
Transmission gate
A
b2A2
EN
e2
B
2Y2
Transmission gate
A
b2A3
EN
e2
B
2Y3
12
Ctrl
+
G
Library
…
Chip N
2×
Library
…
74HC244
Enter
74HC244
1OE
1A0
1A1
1A2
1A3
2A3
2A2
2A1
2A0
2OE
2Y0
2Y1
2Y2
2Y3
1Y3
1Y2
1Y1
1Y0
© 2026 Daniil Khanin · khanin.info · HB-05
61
74HC245
13
IN
10×
OUT
8×
DIR
A0
A1
A2
A3
A4
A5
A6
A7
OE
B7
B6
B5
B4
B3
B2
B1
B0
14
74HC04
1×
1
8×
74HC04
1A
OE
2A
DIR
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nOE
2Y
nDIR
3Y
4Y
5Y
6Y
15
74HC00
1×
1
10×
74HC00
1A
nOE
1B
DIR
2A
nOE
2B
nDIR
3A
GND
3B
GND
4A
GND
4B
GND
1Y
oAB
2Y
oBA
3Y
4Y
16
74HC244
1×
18×
74HC244
1OE
oAB
1A0
A0
1A1
A1
1A2
A2
1A3
A3
2A3
A7
2A2
A6
2A1
A5
2A0
A4
2OE
oAB
2Y0
B4
2Y1
B5
2Y2
B6
2Y3
B7
1Y3
B3
1Y2
B2
1Y1
B1
1Y0
B0
© 2026 Daniil Khanin · khanin.info · HB-05
62
74HC245 …
17
74HC244
1×
18×
74HC244
1OE
oBA
1A0
B0
1A1
B1
1A2
B2
1A3
B3
2A3
B7
2A2
B6
2A1
B5
2A0
B4
2OE
oBA
2Y0
A4
2Y1
A5
2Y2
A6
2Y3
A7
1Y3
A3
1Y2
A2
1Y1
A1
1Y0
A0
18
Ctrl
+
G
Library
…
Chip N
2×
Library
…
74HC245
Enter
74HC245
DIR
A0
A1
A2
A3
A4
A5
A6
A7
OE
B7
B6
B5
B4
B3
B2
B1
B0
© 2026 Daniil Khanin · khanin.info · HB-05
63
CANVAS
19
0
5×
5×
0
X0
0
X1
0
X2
0
X3
0
Y0
20
0
3×
3×
0
Y1
0
Y2
0
Y3
21
0
2×
2×
0
SEL
0
OFF
22
74HC04
1×
1
7×
74HC04
1A
SEL
2A
GND
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nSEL
2Y
3Y
4Y
5Y
6Y
23
74HC32
1×
1
10×
74HC32
1A
SEL
1B
OFF
2A
nSEL
2B
OFF
3A
GND
3B
GND
4A
GND
4B
GND
1Y
oeX
2Y
oeY
3Y
4Y
© 2026 Daniil Khanin · khanin.info · HB-05
64
CANVAS …
24
74HC244
1×
18×
74HC244
1OE
oeX
1A0
X0
1A1
X1
1A2
X2
1A3
X3
2A3
Y3
2A2
Y2
2A1
Y1
2A0
Y0
2OE
oeY
2Y0
BUS0
2Y1
BUS1
2Y2
BUS2
2Y3
BUS3
1Y3
BUS3
1Y2
BUS2
1Y1
BUS1
1Y0
BUS0
25
3×
6×
BUS0
GND
BUS1
GND
BUS2
GND
26
1×
2×
BUS3
GND
© 2026 Daniil Khanin · khanin.info · HB-05
65
CANVAS …
27
0
5×
5×
0
DIR
0
KS0
0
KS1
0
KS2
0
KS3
28
3×
6×
KS0
K0
KS1
K1
KS2
K2
29
1×
2×
KS3
K3
30
74HC245
1×
18×
74HC245
DIR
DIR
A0
BUS0
A1
BUS1
A2
BUS2
A3
BUS3
A4
UA4
A5
UA5
A6
UA6
A7
UA7
OE
GND
B7
UB7
B6
UB6
B5
UB5
B4
UB4
B3
K3
B2
K2
B1
K1
B0
K0
© 2026 Daniil Khanin · khanin.info · HB-05
66
CANVAS …
31
3×
6×
UA4
GND
UA5
GND
UA6
GND
32
3×
6×
UA7
GND
UB4
GND
UB5
GND
33
2×
4×
UB6
GND
UB7
GND
34
4b
0
A
1×
4×
4×
4b
0
BUS
K0
K1
K2
K3
0
SEL
SEL = 0 → X, SEL = 1 → Y
© 2026 Daniil Khanin · khanin.info · HB-05
67
7
Electronic dice
the finale: a counter to six and seven dots
kh
HB-05
Hz
1×
Q
Q
2×
74HC04
1×
1
74HC08
1×
1
74HC74
2×
2
74HC86
1×
3
74HC32
1×
1
7×
∞
© 2026 Daniil Khanin · khanin.info · HB-05
68
CANVAS
1
Delete
0
X0
0
X1
0
X2
0
X3
0
Y0
0
Y1
0
Y2
0
Y3
0
SEL
2
Delete
0
OFF
BUS0
GND
BUS1
GND
BUS2
GND
BUS3
GND
0
DIR
0
KS0
0
KS1
0
KS2
© 2026 Daniil Khanin · khanin.info · HB-05
69
CANVAS …
3
Delete
0
KS3
KS0
K0
KS1
K1
KS2
K2
KS3
K3
UA4
GND
UA5
GND
UA6
GND
UA7
GND
4
Delete
UB4
GND
UB5
GND
UB6
GND
UB7
GND
4b
0
BUS
K0
K1
K2
K3
© 2026 Daniil Khanin · khanin.info · HB-05
70
CANVAS …
5
Delete
74HC04
1A
SEL
2A
GND
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nSEL
2Y
3Y
4Y
5Y
6Y
74HC32
1A
SEL
1B
OFF
2A
nSEL
2B
OFF
3A
GND
3B
GND
4A
GND
4B
GND
1Y
oeX
2Y
oeY
3Y
4Y
6
Delete
74HC244
1OE
oeX
1A0
X0
1A1
X1
1A2
X2
1A3
X3
2A3
Y3
2A2
Y2
2A1
Y1
2A0
Y0
2OE
oeY
2Y0
BUS0
2Y1
BUS1
2Y2
BUS2
2Y3
BUS3
1Y3
BUS3
1Y2
BUS2
1Y1
BUS1
1Y0
BUS0
74HC245
DIR
DIR
A0
BUS0
A1
BUS1
A2
BUS2
A3
BUS3
A4
UA4
A5
UA5
A6
UA6
A7
UA7
OE
GND
B7
UB7
B6
UB6
B5
UB5
B4
UB4
B3
K3
B2
K2
B1
K1
B0
K0
© 2026 Daniil Khanin · khanin.info · HB-05
71
CANVAS …
7
Hz
1×
Q
Q
2×
3×
1Hz
CLK
Roll
Roll
ROLL
Reset
Reset
RST
8
74HC04
1×
1
8×
74HC04
1A
RST
2A
PAR
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nRST
2Y
DC
3Y
4Y
5Y
6Y
9
74HC08
1×
1
10×
74HC08
1A
CLK
1B
ROLL
2A
Q2
2B
Q1N
3A
GND
3B
GND
4A
GND
4B
GND
1Y
SPIN
2Y
DD
3Y
4Y
10
74HC74
1×
2
12×
74HC74
1RD
nRST
1D
Q2N
1CP
SPIN
1SD
VCC
2SD
VCC
2CP
SPIN
2D
Q0
2RD
nRST
1Q
Q0
1QN
Q0N
2QN
Q1N
2Q
Q1
© 2026 Daniil Khanin · khanin.info · HB-05
72
CANVAS …
11
74HC74
1×
2
10×
74HC74
1RD
nRST
1D
Q1
1CP
SPIN
1SD
VCC
2SD
VCC
2CP
GND
2D
GND
2RD
VCC
1Q
Q2
1QN
Q2N
2QN
2Q
12
74HC86
1×
3
10×
74HC86
1A
Q0
1B
Q1
2A
X01
2B
Q2
3A
GND
3B
GND
4A
GND
4B
GND
1Y
X01
2Y
PAR
3Y
4Y
13
74HC32
1×
1
9×
74HC32
1A
Q0
1B
Q2
2A
GND
2B
GND
3A
GND
3B
GND
4A
GND
4B
GND
1Y
DA
2Y
3Y
4Y
14
lamps in a 3 × 3 square, like the dots of a dice
15
5×
5×
DC
DA
DA
Q2
Q2
© 2026 Daniil Khanin · khanin.info · HB-05
73
CANVAS …
16
2×
2×
DD
DD
17
DA
Q2
DD
DC
DD
Q2
DA
↖ ↘ — DA · ↗ ↙ — Q2
← → — DD · • — DC
Reset — 1
hold Roll — let go
© 2026 Daniil Khanin · khanin.info · HB-05
74
Kit parts
how many times you place each part over all the lessons
N
14×
P
14×
24×
VCC
1×
GND
1×
0
21×
44×
TG
16×
4b
0
A
4×
Hz
4×
Q
Q
9×
♪
1×
IN
105×
OUT
78×
1023×
© 2026 Daniil Khanin · khanin.info · HB-05
75
Kit chips
you build them yourself: each one is made of the ones before
OR
5×
0
NAND
5×
0
AND
5×
0
NOR
4×
0
NOT
6×
0
XOR
4×
0
74HC32
3×
1
74HC08
6×
1
74HC04
13×
1
74HC00
4×
1
74HC02
2×
1
NAND3
12×
2
74HC74
18×
2
74HC86
2×
3
74HC390
1×
3
74HC138
2×
4
74HC595
1×
5
74HC244
3×
6
74HC245
1×
6
© 2026 Daniil Khanin · khanin.info · HB-05
76
Done!
74HC00
74HC74
74HC595
twelve chips — 1,448 transistors, the dice — 268
hold Roll — and let go
© 2026 Daniil Khanin · khanin.info · HB-05
77
Copyright
© 2026 Daniil Khanin, khanin.info. All rights reserved.
These instructions, the drawings and circuits are original work.
Reprinting, publishing online, selling or passing it on to others,
in whole or in part, is prohibited without the written permission of the author.
The latest version is at khanin.info.
kh
khanin.info
HB-05
© 2026 Daniil Khanin · khanin.info · HB-05
78