HardLabs

THAT MicPre

ojg·thatmicpre·rack/thatmicpre_v2.kicad_pcb

THAT MicPre PCB layout, top view — open source board by ojg

About the THAT MicPre PCB

THAT MicPre is an open source PCB design by ojg, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 140 × 74.2 mm, with 81 components from 45 distinct parts.

Other key parts include the 1512P08-U. By type, the board carries 29 resistors, 18 capacitors, 15 diodes, 10 connectors, 3 switches and 2 transistors.

It belongs with the audio designs in this gallery, and the repository also holds 1 earlier revision of it.

From the project

Microphone Pre-amplifier

ThatMicPre ===== A simple, high-quality DIY microphone pre-amplifier with switched gain.

The background for this project was that I needed a simple but good microphone preamp for doing acoustic measurements. I needed a switched gain to be able to reproduce the gain setting in a more predictable way than what is possible with a potmeter. I could not find any existing DIY designs, so I decided to make one.

THAT MicPre, from the project README
From the project README

Main components on the THAT MicPre

1512P08-U

THAT MicPre bill of materials (BOM)

81 components, 45 distinct parts.

QtyPartRefs
1
1512P08-U
U1
2
BC546CTA
Q1, Q2
1
CON-SOCJ-2155
J1
1
NC3FBH2
J2
1
NC3MBH1
J3
2
Female header
J4, J6
2
Male pinheader
J5, J7
2
Angled pinheader
J8, J10
1
NMJ6HFD2
J9
1
0ZRC0015FF1E
F1
2
DPDT
SW1, SW2
1
SR2612F-0112-38F5B-D8-S
SW3
5
1N4004
D1, D2, D3, D4, D7
6
1N4148
D5, D6, D8, D13, D18, D19
1
LED_Dual_AKA
D9
3
16V
D15, D16, D17
2
10u
L2, L3
2
470p
C1, C2
1
47p
C3
2
47u-63V-BP
C4, C5
Show 25 more
QtyPartRefs
2
100n
C6, C9
6
220u-63V
C7, C8, C10, C11, C12, C18
1
3300u-6V3
C13
2
22u-50V
C14, C16
2
10n
C15, C17
2
1k2-0.1%
R1, R2
2
10R-1W
R3, R4
2
6k8-0.1%-0.5W
R5, R6
3
22k
R7, R10, R11
3
47k
R8, R27, R30
2
10k
R9, R13
1
8K06
R14
1
909R
R15
1
453R
R16
1
237R
R17
1
127R
R18
1
71R
R19
1
39R
R20
1
22R
R21
1
12R4
R22
1
6R81
R23
1
3R9
R24
1
4R99
R25
2
100R
R26, R29
1
4k7
R28

THAT MicPre design files

The KiCad project lives in the ojg/thatmicpre repository on GitHub; these links point at the commit this page was built from.

THAT MicPre: common questions

How big is the THAT MicPre PCB?

The THAT MicPre measures 140 × 74.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the THAT MicPre?

81 components, from 45 distinct parts. The full bill of materials is listed on this page.

Where can I download the THAT MicPre design files?

From the ojg/thatmicpre repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the THAT MicPre design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which ojg chose for the repository.

Earlier revisions in the repo: thatmicpre_v1

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