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Low noise power probe

blinken·power-rail-probe

Low noise power probe PCB layout, top view — open source board by blinken
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About the Low noise power probe PCB

Low noise power probe is an open source PCB design by blinken, published on GitHub under the CC-BY-SA-4.0 license. It is a 6-layer board measuring 69.7 × 114.8 mm, with 105 components from 43 distinct parts.

Other key parts include the OPA354, ADP7142AUJZ-2.5, MCP73213T-A6SI/MF, ADP7182AUJZ-2.5 and HUSB238. By type, the board carries 35 resistors, 20 capacitors, 15 diodes, 12 ICs, 8 connectors and 7 transistors.

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

From the project

Low-noise oscilloscope power rail probe

An Open Hardware low-noise power rail oscilloscope probe, loosely based on the excellent writeup by Andrew Levido [PDF archive].

The probe allows you to measure millivolt-level ripple on a power rail up to 20V, using a normal oscilloscope, by applying a vertical offset. This open design costs <10% of the price of the Tektronix TPR1000.

Measurement of 60mV p-p ripple on a 20V rail (ie. ripple 19.97V - 20.03V) using an inexpensive Picoscope 2204A

Low noise power probe, from the project README
From the project README

Main components on the Low noise power probe

OPA354ADP7142AUJZ-2.5MCP73213T-A6SI/MFADP7182AUJZ-2.5HUSB238LM334DTLM311DRHY2213DW01A

Low noise power probe bill of materials (BOM)

105 components, 43 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
OPA354
U1, U2
1
ADP7142AUJZ-2.5
U3
1
MCP73213T-A6SI/MF
U4
1
ADP7182AUJZ-2.5
U5
1
HUSB238
U6
1
LM334DT
U7
1
LM311DR
U8
2
HY2213
U10, U13
2
DW01A
U11, U12
1
WSE3099
Q1
6
HL2312
Q2, Q3, Q4, Q5, Q6, Q7
2
Amphenol 901-10138
J1, J2
1
DC-005 2.0
J3
1
USB_C_Receptacle
J4
4
RF Shield Clip
J8, J9, J11, J12
1
Dual_Battery_Cell
BT1
4
SMD1206-050C-24V
F1, F2, F3, F4
1
5k
RV1
1
SW_3PDT_x3
SW1
5
Red 1.8V
D1, D3, D4, D5, D6
Show 23 more
QtyPartRefs
1
3V3
D2
2
1N5819WS
D7, D8
7
SD24-MS
D9, D10, D11, D12, D13, D14, D15
1
10uH 5%
L1
1
100n / SRF 28MHz
C1
17
2.2u
C2, C3, C4, C5, C6, C7, C8, C10 +9
2
10uF
C9, C14
1
2R2 1% 400ppm/°C
R1
2
50k .1%
R2, R3
1
1.21k 1% 100ppm/°C
R4
1
3.3k
R5
1
1k .1%
R6
1
10R 1% 200ppm/°C
R7
5
1k
R8, R21, R23, R33, R35
2
5k
R9, R38
3
50k
R10, R22, R24
6
10R 200mW
R11, R27, R28, R29, R30, R32
2
6.04k
R12, R14
2
0R
R13, R26
1
10M
R15
2
620
R16, R17
1
33R
R20
4
100R
R31, R36, R37, R39

Low noise power probe design files

The KiCad project lives in the blinken/power-rail-probe repository on GitHub; these links point at the commit this page was built from.

Low noise power probe: common questions

How big is the Low noise power probe PCB?

The Low noise power probe measures 69.7 × 114.8 mm, has 6 copper layers and is 4.69 mm thick.

How many components are on the Low noise power probe?

105 components, from 43 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Low noise power probe design files?

From the blinken/power-rail-probe repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Low noise power probe design in my own project?

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

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