HardLabs

B3-38A

bfarago·B3-38A·rv_cad/JA972/JA972.kicad_pcb

B3-38A PCB layout, top view — open source board by bfarago

About the B3-38A PCB

B3-38A is an open source PCB design by bfarago, published on GitHub under the LGPL-2.1 license. It is a 2-layer board measuring 160 × 100 mm, with 118 components from 77 distinct parts.

By type, the board carries 55 resistors, 22 capacitors, 21 connectors, 8 transistors, 7 diodes and 2 switches.

It belongs with the sensors and test & measurement designs in this gallery.

From the project

B3-38A Russian Millivoltmeter

REVERSE ENGINEERING ------------------- This repository contains all the collected informations regarding the old russian millivoltmeter instrument. The goal to collect datasheets, schematics, etc.

Technical characteristics ------------------------- Millivoltmeter V3-38A (V3 38A, V338A, b3-38a, b338a, b3 38a)

Designed to measure the rms AC voltage sine wave of 0.1 mV to 300 V in the frequency range from 20 Hz to 5 MHz. The span value of 1 mV, 3mV, 10mV, 30mV, 100mV, 300mV, 1V, 3V, 10V, 30V, 100V and 300V The basic error of ± 2,5%

B3-38A, from the project README
From the project README

B3-38A bill of materials (BOM)

118 components, 77 distinct parts.

QtyPartRefs
7
3107B
Q1, Q2, Q4, Q6, Q7, Q8, Q10
1
kp103l
Q3
1
Conn_Coaxial
J1
1
PGM_SWITCH1
J2
2
PGM_SWITCH2
J3, J5
1
PGM_SWITCH3
J4
1
E1
J6
2
P7
J7, J8
2
P10
J9, J10
1
P11
J11
1
E2
J12
1
E3
J13
1
P6
J14
1
P2
J15
1
P4
J16
1
P1
J17
1
P3
J18
3
P5
J19, J20, J21
1
33k
RV6
1
220k
RV34
Show 57 more
QtyPartRefs
1
1k5
RV57
2
SW_Rotary12
SW2, SW3
4
KD522B
D1, D2, D13, D14
1
D_Bridge_+-AA
D3
2
12V
D11, D12
1
1600 500V 5%
C1
1
2700 500V 5%
C2
1
150 10%
C3
1
2p2
C4
1
2/7
C5
1
0,047uF/400V/10%
C6
1
200u/25V
C7
1
1u/6v3
C8
1
15+-10%/ M47
C9
1
22u/20v
C10
1
200u/25v
C11
1
CTRIM
C12
1
15+-10%/ M47
C13
1
200u/25v
C14
1
100u/6v3
C15
1
x
C16
3
x
C17, C18, C19
1
200u/25v
C21
1
100u/50v
C22
1
50u/100v
C23
1
7k5
R1
1
5k11
R2
1
21,8
R3
1
5M11
R4
1
47k
R5
2
510
R7, R44
1
2M7
R8
1
220k
R9
2
5k6
R10, R35
2
3k
R11, R13
1
51
R12
6
1k
R14, R38, R39, R47, R50, R51
1
402
R15
1
390
R16
1
150
R17
4
56k
R18, R21, R24, R27
5
357
R19, R22, R25, R28, R30
5
240
R20, R23, R26, R29, R52
1
165
R31
1
22k
R32
2
110
R33, R37
1
10
R36
1
33k
R40
1
100
R41
2
2k2
R42, R45
1
15
R43
1
680
R46
1
55,6
R48
1
91
R49
2
1M
R53, R54
2
2,49k
R55, R56
1
6k8
R58

B3-38A design files

The KiCad project lives in the bfarago/B3-38A repository on GitHub; these links point at the commit this page was built from.

B3-38A: common questions

How big is the B3-38A PCB?

The B3-38A measures 160 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the B3-38A?

118 components, from 77 distinct parts. The full bill of materials is listed on this page.

Where can I download the B3-38A design files?

From the bfarago/B3-38A repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the B3-38A design in my own project?

Yes, under the terms of its LGPL-2.1 license, which bfarago chose for the repository.

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