Remote
Work location
Design Project -Precision analog front-end board for an electrical-safety measurement instrument (proof of concept) Anyone
About the job
OVERVIEW
We are developing a precision measurement instrument for electrical safety testing. We need an experienced engineer to design (and preferably build) an analog front-end board that plugs into an off-the-shelf STM32H747I-DISCO development kit. We write the measurement firmware ourselves. A detailed hardware specification (circuit values, parts candidates, layout rules, test plan) is ready and will be shared with shortlisted bidders under NDA.
KEY REQUIREMENTS (summary — full detail in the specification)
- Mixed-signal board: mains-rated protected input, precision attenuators, low-noise amplifiers (including one low-level input with x100 low-noise gain), 4th-order anti-alias filters, and a 16-bit 4-channel simultaneous-sampling ADC (AD7380-4) at about 1.5 MS/s with an external precision reference.
- Accuracy: overall measurement within 1% from 60 Hz to 100 kHz; each channel flat within ±0.5% to 150 kHz before calibration.
- Safety: the input must survive a 240 V rms fault without damage; relay-based input protection with a hardware trip; creepage and clearance designed to IEC 61010-1.
- Interface: SPI data lines, relay control and trip signal to the DISCO kit's expansion connectors (adapter board acceptable if needed).
- Quantity: 3 or 5 assembled boards.
SCOPE AND MILESTONES (each approved in writing before the next starts)
1. Schematic and parts list: schematic (PDF), parts list (Excel/CSV) with manufacturer part numbers and alternates, ERC report, and a... read more
We are developing a precision measurement instrument for electrical safety testing. We need an experienced engineer to design (and preferably build) an analog front-end board that plugs into an off-the-shelf STM32H747I-DISCO development kit. We write the measurement firmware ourselves. A detailed hardware specification (circuit values, parts candidates, layout rules, test plan) is ready and will be shared with shortlisted bidders under NDA.
KEY REQUIREMENTS (summary — full detail in the specification)
- Mixed-signal board: mains-rated protected input, precision attenuators, low-noise amplifiers (including one low-level input with x100 low-noise gain), 4th-order anti-alias filters, and a 16-bit 4-channel simultaneous-sampling ADC (AD7380-4) at about 1.5 MS/s with an external precision reference.
- Accuracy: overall measurement within 1% from 60 Hz to 100 kHz; each channel flat within ±0.5% to 150 kHz before calibration.
- Safety: the input must survive a 240 V rms fault without damage; relay-based input protection with a hardware trip; creepage and clearance designed to IEC 61010-1.
- Interface: SPI data lines, relay control and trip signal to the DISCO kit's expansion connectors (adapter board acceptable if needed).
- Quantity: 3 or 5 assembled boards.
SCOPE AND MILESTONES (each approved in writing before the next starts)
1. Schematic and parts list: schematic (PDF), parts list (Excel/CSV) with manufacturer part numbers and alternates, ERC report, and a... read more
OVERVIEW
We are developing a precision measurement instrument for electrical safety testing. We need an experienced engineer to design (and preferably build) an analog front-end board that plugs into an off-the-shelf STM32H747I-DISCO development kit. We write the measurement firmware ourselves. A detailed hardware specification (circuit values, parts candidates, layout rules, test plan) is ready and will be shared with shortlisted bidders under NDA.
KEY REQUIREMENTS (summary — full detail in the specification)
- Mixed-signal board: mains-rated protected input, precision attenuators, low-noise amplifiers (including one low-level input with x100 low-noise gain), 4th-order anti-alias filters, and a 16-bit 4-channel simultaneous-sampling ADC (AD7380-4) at about 1.5 MS/s with an external precision reference.
- Accuracy: overall measurement within 1% from 60 Hz to 100 kHz; each channel flat within ±0.5% to 150 kHz before calibration.
- Safety: the input must survive a 240 V rms fault without damage; relay-based input protection with a hardware trip; creepage and clearance designed to IEC 61010-1.
- Interface: SPI data lines, relay control and trip signal to the DISCO kit's expansion connectors (adapter board acceptable if needed).
- Quantity: 3 or 5 assembled boards.
SCOPE AND MILESTONES (each approved in writing before the next starts)
1. Schematic and parts list: schematic (PDF), parts list (Excel/CSV) with manufacturer part numbers and alternates, ERC report, and a data-path analysis (short PDF report: pin table, timing budget for one sample frame, timing diagram, DMA data-rate check, fallback) showing every ADC sample reaches the processor's memory at 1.5 MS/s with margin.
2. Layout before fabrication: PDF plots of every layer, Gerber and drill files, 3D view, stack-up, DRC report.
3. Boards delivered: assembled boards, editable design source files, Gerbers, drill and pick-and-place files, assembly drawing, and an acceptance test report with measured values, raw data files, test setup photos and instruments used. Acceptance covers gain, frequency response, anti-alias attenuation, noise, data path, relay trip time and a 240 V fault test.
All review files must open without your design software (PDF, Excel/CSV, Gerber, plain-text reports). All design files and footprints belong to us.
PLEASE QUOTE SEPARATELY
a) Design only (milestones 1 and 2, plus design support during build)
b) Fabrication, assembly and acceptance testing: 3 boards and 5 boards
c) Optional: bring-up firmware (ADC driver with DMA at 1.5 MS/s, relay and trip handling, raw data logger, source code delivered)
Give a price and lead time for each milestone.
IN YOUR BID, PLEASE ANSWER
1. Describe one precision measurement or data-acquisition board you designed (accuracy achieved, ADC used) and, if possible, one mains-connected design.
2. Have you designed to IEC 61010-1 (or UL 61010) creepage and clearance rules?
3. Can you fabricate, assemble and test the boards yourself or through a partner? Do you have a bench with a precision multimeter, signal generator and oscilloscope?
4. Which design tool do you use (Altium, KiCad, other)?
5. Who will do the work (you alone or a team), your location and time zone, and your availability per week?
6. Your earliest start date and total timeline.
7. Any concerns or questions about the requirements above.
Bids that do not answer these questions will not be considered. Shortlisted bidders will receive the full specification under NDA.
Location: US-based preferred; others considered with a clear plan for fabrication, assembly and testing.
Desired start: In a month. Target for boards delivered: ASAP read less
We are developing a precision measurement instrument for electrical safety testing. We need an experienced engineer to design (and preferably build) an analog front-end board that plugs into an off-the-shelf STM32H747I-DISCO development kit. We write the measurement firmware ourselves. A detailed hardware specification (circuit values, parts candidates, layout rules, test plan) is ready and will be shared with shortlisted bidders under NDA.
KEY REQUIREMENTS (summary — full detail in the specification)
- Mixed-signal board: mains-rated protected input, precision attenuators, low-noise amplifiers (including one low-level input with x100 low-noise gain), 4th-order anti-alias filters, and a 16-bit 4-channel simultaneous-sampling ADC (AD7380-4) at about 1.5 MS/s with an external precision reference.
- Accuracy: overall measurement within 1% from 60 Hz to 100 kHz; each channel flat within ±0.5% to 150 kHz before calibration.
- Safety: the input must survive a 240 V rms fault without damage; relay-based input protection with a hardware trip; creepage and clearance designed to IEC 61010-1.
- Interface: SPI data lines, relay control and trip signal to the DISCO kit's expansion connectors (adapter board acceptable if needed).
- Quantity: 3 or 5 assembled boards.
SCOPE AND MILESTONES (each approved in writing before the next starts)
1. Schematic and parts list: schematic (PDF), parts list (Excel/CSV) with manufacturer part numbers and alternates, ERC report, and a data-path analysis (short PDF report: pin table, timing budget for one sample frame, timing diagram, DMA data-rate check, fallback) showing every ADC sample reaches the processor's memory at 1.5 MS/s with margin.
2. Layout before fabrication: PDF plots of every layer, Gerber and drill files, 3D view, stack-up, DRC report.
3. Boards delivered: assembled boards, editable design source files, Gerbers, drill and pick-and-place files, assembly drawing, and an acceptance test report with measured values, raw data files, test setup photos and instruments used. Acceptance covers gain, frequency response, anti-alias attenuation, noise, data path, relay trip time and a 240 V fault test.
All review files must open without your design software (PDF, Excel/CSV, Gerber, plain-text reports). All design files and footprints belong to us.
PLEASE QUOTE SEPARATELY
a) Design only (milestones 1 and 2, plus design support during build)
b) Fabrication, assembly and acceptance testing: 3 boards and 5 boards
c) Optional: bring-up firmware (ADC driver with DMA at 1.5 MS/s, relay and trip handling, raw data logger, source code delivered)
Give a price and lead time for each milestone.
IN YOUR BID, PLEASE ANSWER
1. Describe one precision measurement or data-acquisition board you designed (accuracy achieved, ADC used) and, if possible, one mains-connected design.
2. Have you designed to IEC 61010-1 (or UL 61010) creepage and clearance rules?
3. Can you fabricate, assemble and test the boards yourself or through a partner? Do you have a bench with a precision multimeter, signal generator and oscilloscope?
4. Which design tool do you use (Altium, KiCad, other)?
5. Who will do the work (you alone or a team), your location and time zone, and your availability per week?
6. Your earliest start date and total timeline.
7. Any concerns or questions about the requirements above.
Bids that do not answer these questions will not be considered. Shortlisted bidders will receive the full specification under NDA.
Location: US-based preferred; others considered with a clear plan for fabrication, assembly and testing.
Desired start: In a month. Target for boards delivered: ASAP read less
OVERVIEW
We are developing a precision measurement instrument for electrical safety testing. We need an experienced engineer to design (and preferably build) an analog front-end board that plugs into an off-the-shelf STM32H747I-DISCO development kit. We write the measurement firmware ourselves. A detailed hardware specification (circuit values, parts candidates, layout rules, test plan) is ready... read more
We are developing a precision measurement instrument for electrical safety testing. We need an experienced engineer to design (and preferably build) an analog front-end board that plugs into an off-the-shelf STM32H747I-DISCO development kit. We write the measurement firmware ourselves. A detailed hardware specification (circuit values, parts candidates, layout rules, test plan) is ready... read more
OVERVIEW
We are developing a precision measurement instrument for electrical safety testing. We need an experienced engineer to design (and preferably build) an analog front-end board that plugs into an off-the-shelf STM32H747I-DISCO development kit. We write the measurement firmware ourselves. A detailed hardware specification (circuit values, parts candidates, layout rules, test plan) is ready and will be shared with shortlisted bidders under NDA.
KEY REQUIREMENTS (summary — full detail in the specification)
- Mixed-signal board: mains-rated protected input, precision attenuators, low-noise amplifiers (including one low-level input with x100 low-noise gain), 4th-order anti-alias filters, and a 16-bit 4-channel simultaneous-sampling ADC (AD7380-4) at about 1.5 MS/s with an external precision reference.
- Accuracy: overall measurement within 1% from 60 Hz to 100 kHz; each channel flat within ±0.5% to 150 kHz before calibration.
- Safety: the input must survive a 240 V rms fault without damage; relay-based input protection with a hardware trip; creepage and clearance designed to IEC 61010-1.
- Interface: SPI data lines, relay control and trip signal to the DISCO kit's expansion connectors (adapter board acceptable if needed).
- Quantity: 3 or 5 assembled boards.
SCOPE AND MILESTONES (each approved in writing before the next starts)
1. Schematic and parts list: schematic (PDF), parts list (Excel/CSV) with manufacturer part numbers and alternates, ERC report, and a data-path analysis (short PDF report: pin table, timing budget for one sample frame, timing diagram, DMA data-rate check, fallback) showing every ADC sample reaches the processor's memory at 1.5 MS/s with margin.
2. Layout before fabrication: PDF plots of every layer, Gerber and drill files, 3D view, stack-up, DRC report.
3. Boards delivered: assembled boards, editable design source files, Gerbers, drill and pick-and-place files, assembly drawing, and an acceptance test report with measured values, raw data files, test setup photos and instruments used. Acceptance covers gain, frequency response, anti-alias attenuation, noise, data path, relay trip time and a 240 V fault test.
All review files must open without your design software (PDF, Excel/CSV, Gerber, plain-text reports). All design files and footprints belong to us.
PLEASE QUOTE SEPARATELY
a) Design only (milestones 1 and 2, plus design support during build)
b) Fabrication, assembly and acceptance testing: 3 boards and 5 boards
c) Optional: bring-up firmware (ADC driver with DMA at 1.5 MS/s, relay and trip handling, raw data logger, source code delivered)
Give a price and lead time for each milestone.
IN YOUR BID, PLEASE ANSWER
1. Describe one precision measurement or data-acquisition board you designed (accuracy achieved, ADC used) and, if possible, one mains-connected design.
2. Have you designed to IEC 61010-1 (or UL 61010) creepage and clearance rules?
3. Can you fabricate, assemble and test the boards yourself or through a partner? Do you have a bench with a precision multimeter, signal generator and oscilloscope?
4. Which design tool do you use (Altium, KiCad, other)?
5. Who will do the work (you alone or a team), your location and time zone, and your availability per week?
6. Your earliest start date and total timeline.
7. Any concerns or questions about the requirements above.
Bids that do not answer these questions will not be considered. Shortlisted bidders will receive the full specification under NDA.
Location: US-based preferred; others considered with a clear plan for fabrication, assembly and testing.
Desired start: In a month. Target for boards delivered: ASAP read less
We are developing a precision measurement instrument for electrical safety testing. We need an experienced engineer to design (and preferably build) an analog front-end board that plugs into an off-the-shelf STM32H747I-DISCO development kit. We write the measurement firmware ourselves. A detailed hardware specification (circuit values, parts candidates, layout rules, test plan) is ready and will be shared with shortlisted bidders under NDA.
KEY REQUIREMENTS (summary — full detail in the specification)
- Mixed-signal board: mains-rated protected input, precision attenuators, low-noise amplifiers (including one low-level input with x100 low-noise gain), 4th-order anti-alias filters, and a 16-bit 4-channel simultaneous-sampling ADC (AD7380-4) at about 1.5 MS/s with an external precision reference.
- Accuracy: overall measurement within 1% from 60 Hz to 100 kHz; each channel flat within ±0.5% to 150 kHz before calibration.
- Safety: the input must survive a 240 V rms fault without damage; relay-based input protection with a hardware trip; creepage and clearance designed to IEC 61010-1.
- Interface: SPI data lines, relay control and trip signal to the DISCO kit's expansion connectors (adapter board acceptable if needed).
- Quantity: 3 or 5 assembled boards.
SCOPE AND MILESTONES (each approved in writing before the next starts)
1. Schematic and parts list: schematic (PDF), parts list (Excel/CSV) with manufacturer part numbers and alternates, ERC report, and a data-path analysis (short PDF report: pin table, timing budget for one sample frame, timing diagram, DMA data-rate check, fallback) showing every ADC sample reaches the processor's memory at 1.5 MS/s with margin.
2. Layout before fabrication: PDF plots of every layer, Gerber and drill files, 3D view, stack-up, DRC report.
3. Boards delivered: assembled boards, editable design source files, Gerbers, drill and pick-and-place files, assembly drawing, and an acceptance test report with measured values, raw data files, test setup photos and instruments used. Acceptance covers gain, frequency response, anti-alias attenuation, noise, data path, relay trip time and a 240 V fault test.
All review files must open without your design software (PDF, Excel/CSV, Gerber, plain-text reports). All design files and footprints belong to us.
PLEASE QUOTE SEPARATELY
a) Design only (milestones 1 and 2, plus design support during build)
b) Fabrication, assembly and acceptance testing: 3 boards and 5 boards
c) Optional: bring-up firmware (ADC driver with DMA at 1.5 MS/s, relay and trip handling, raw data logger, source code delivered)
Give a price and lead time for each milestone.
IN YOUR BID, PLEASE ANSWER
1. Describe one precision measurement or data-acquisition board you designed (accuracy achieved, ADC used) and, if possible, one mains-connected design.
2. Have you designed to IEC 61010-1 (or UL 61010) creepage and clearance rules?
3. Can you fabricate, assemble and test the boards yourself or through a partner? Do you have a bench with a precision multimeter, signal generator and oscilloscope?
4. Which design tool do you use (Altium, KiCad, other)?
5. Who will do the work (you alone or a team), your location and time zone, and your availability per week?
6. Your earliest start date and total timeline.
7. Any concerns or questions about the requirements above.
Bids that do not answer these questions will not be considered. Shortlisted bidders will receive the full specification under NDA.
Location: US-based preferred; others considered with a clear plan for fabrication, assembly and testing.
Desired start: In a month. Target for boards delivered: ASAP read less
Things to know
Expert
Skill Level
Open budget
Fixed-rate
Part-time
Job type
1-3 months
Job duration
Areas of expertise
Altium
Analog Electronics Design
Electronic Enclosure Design
Hardware Prototyping
Instrumentation
KiCAD PCB
KiCad
Precision Engineering
+5 more
Job categories
Electronic Prototyping and Design Services
Engineering Design
Electronics Design Service
Electrical Circuit Design Services
PCB Design Services
+2 more
About the client
Payment not ready
United States (03:01 am)
Posted
Active
Job activity
7 Applicants
0 interviews in progress
Similar jobs
Nodo Design
Remote - Posted
This is a new product, and the images were AI-generated, so the views may not match exactly. You can adjust the shape and prepare the drawing in a suitable way for the molding...
3D Design Services
3D Modeling
Engineering Design
View job
solidworks design automatic chain link fence machine
Remote - Posted
I am looking for a 3D CAD design of an Automatic Chain Link Fence Machine using SolidWorks.
Project Requirements:
1. Complete 3D Assembly (.sldasm) and Part files (.sldprt)...
Engineering Design
3D Modeling
SolidWorks Design Services
View job
PCB designer for a golf trolley
Remote - Posted
We are looking a designer of a pcb. We want build a electric golf trolley for consumer and for rent. Benchmark is mgi navigator trolley.
We need all aspects about our P...
PCB Design Services
Electronics Design Service
3D Design Services
View job
Electronics Engineer – PCB Sourcing & Supply Chain (Freelance)
Remote - Posted
We are looking for a technically skilled Electronics Engineer with strong international PCB sourcing experience, an entrepreneurial mindset, and excellent English communicatio...
Industrial Design Services
Product Engineering Services
Engineering Design
PCB Design Services
Electronics Design Service
View job
P&ID Preparation from doing site survey in Microsoft Visio
Silvassa, India - Posted
P&ID Preparation from doing site survey of a lube plant in Microsoft Visio. Plant location is silvassa. Client dosen't have exisiting P&ID, the entire P&ID as to made by doing...
Engineering Design
3D Design Services
3D Modeling
View job
Custom PCB Design for Arduino-Based Bionic Prosthetic Hand with 2× PCA9685, Myoelectric Sensor & Servo Power System
Remote - Posted
I am developing a bionic/prosthetic hand and forearm prototype and would like a quote for designing a compact custom PCB that integrates the main electronics of the system int...
PCB Design Services
Prosthetics Design
3D Design Services
View job
How it works
Find hourly jobs
Top rated experts are regularly hired for hourly jobs & ongoing client work.
Fixed-rate jobs
Experts can browse & apply to fixed-rate work & quote on a flat-rate basis.
Design contests
Experts build a reputation and earn prizes by participating in design challenges.
About Cad Crowd
4.9/5.0
(Our client satisfaction)
G2 2022
Spring high performer
216,764
global members
33,572
projects delivered to clients
Trusted by
