DIY Scanning Electron Microscope - Overview ↗
See the complete gun, vacuum, scan and detector system in a working homemade SEM.
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Different hardware and detector; this is an overview, not this project’s assembly manual.
THE FIRST BUILD / WATCH → PRACTICE → VERIFY
From the workbench
to your first image.
A practical video companion for assembling your first electron microscope. Follow the stages in order, use the project drawings at the bench, and record what you actually measure.
25 videos · 9 stages · Curated 15 September 2026
↓ Download the CSV25 videos across 9 stages
Plan the first build
Identify every purchased part and board revision; choose the specimen-current detector before considering the biased collector.
Before moving on
Record exact gun, heater, pump, lens and driver models; unresolved parts remain open.
Project guide ↗DIY Scanning Electron Microscope - Sources, Costs and References ↗
Understand subsystem sourcing and how a homemade microscope project is scoped.
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Historical prices and availability are not a current shopping list.
Scanning Electron Microscopy (SEM) Lecture: Principles, Techniques & Applications ↗
Build a foundation in electron optics, signals and SEM imaging.
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Lecture on general SEM principles; does not validate this prototype’s resolution.
Practice and assemble PCBs
Practice on a spare board, then populate and inspect the selected controller, detector and scan boards.
Before moving on
Inspect polarity, pin 1, bridges, joints and cleanliness against the actual BOM and assembly drawings.
Project guide ↗EEVblog #180 - Soldering Tutorial Part 1 - Tools ↗
Choose soldering tools and prepare a practical electronics workbench.
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Use solder, flux and cleaning methods compatible with the fitted components.
EEVblog #183 - Soldering Tutorial Part 2 ↗
Practice through-hole joints for connectors and larger components.
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Practice on scrap first; reference the actual board orientation drawings.
EEVblog #186 - Soldering Tutorial Part 3 - Surface Mount ↗
Learn surface-mount placement and soldering for the controller and detector boards.
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Inspect fine-pitch joints under magnification; a generic tutorial is not a board acceptance test.
EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial ↗
Understand drag soldering and thermal-pad assembly techniques.
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Use the package manufacturer’s land pattern and reflow guidance for exposed pads.
EEVblog #415 - SMD Stencil Reflow Soldering Tutorial ↗
Learn stencil and paste workflow for boards with many surface-mount parts.
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Select a suitable paste and thermal process for the actual parts and PCB.
Assemble the vacuum system
Learn clean flange handling, seals, feedthrough installation and leak-test concepts.
Before moving on
Record a repeatable pump-down curve using the actual pump and gauge manuals; resolve leaks before adding beam power.
Project guide ↗Working with KF (QR) Vacuum Flange Components | Thorlabs Insights ↗
Learn inspection, cleaning, O-ring placement and clamping of KF joints.
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Apply only to matching KF hardware; follow seal compatibility and cleanliness requirements.
ISO-KF flange system by Pfeiffer ↗
See how the centering ring, O-ring and clamp form a KF connection.
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A short mechanism animation; use the detailed handling demonstration for assembly practice.
Working with CF Vacuum Flanges | Thorlabs Insights ↗
Learn copper-gasket handling and CF feedthrough/flange assembly.
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Only if your chamber uses CF flanges; CF and KF sealing procedures are different.
Leak detection methods - part 1: Integral test of parts under vacuum in helium ↗
Understand the principle of helium leak testing a vacuum assembly.
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Requires suitable leak-detection equipment; this is not a substitute for the pump and gauge manuals.
Functional principle of Duo 6 and Duo 6 M by Pfeiffer Vacuum ↗
Understand rotary-vane backing pump operation.
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Pump-specific illustration; use the actual backing and turbo controller manuals for sequencing.
Check low-voltage power
Bring up each selected low-voltage board separately with beam HV disconnected and collector bias disabled.
Before moving on
Measure rails, current draw, startup, ripple and temperature against the selected board specifications.
Project guide ↗Instrument Basics: Bench Power Supplies - Workbench Wednesdays ↗
Learn bench supply controls before powering prototype electronics.
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Beam HV disconnected; the original detector, integrated detector and acceleration controller have different inputs.
3.2. Lab Guidance - Power Supply - Current Limiting ↗
Learn the current-limit function used in staged low-voltage bring-up.
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Choose limits from the selected board’s load budget; current limiting does not establish HV isolation.
Build and calibrate the detector
Start with the near-ground specimen-current LMC662 detector; learn current-to-voltage conversion.
Before moving on
Measure zero, gain, sign, noise and settling using known injected currents; verify holder isolation from the grounded stage.
Project guide ↗TI Precision Labs - Transimpedance amps: Introduction ↗
Understand transimpedance gain, input capacitance and bandwidth.
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Optical examples teach the amplifier principle; the first-build sensor is specimen current.
How to Design Transimpedance Amplifier Circuits ↗
Relate input current, feedback resistance and measured output voltage.
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The example current range is not the SEM pA/nA range; retain the project’s actual gain and offset network.
Photodiode amplifier circuit ↗
Understand feedback, bandwidth and output-range constraints in a detector amplifier.
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Different op amp and sensor; not a replacement circuit for the LMC662 board.
Verify scanning and readout
Understand X/Y beam control, sampling and image reconstruction before connecting beam hardware.
Before moving on
Verify DAC center/endpoints, fresh ADC samples and scan timing on dummy loads; lens and plate drivers still need qualification.
Project guide ↗Electron beam control in a scanning electron microscope ↗
Connect electron optics and deflection to raster scanning.
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Beam Lab’s DAC80502 produces low-voltage commands; external electrode/lens drivers are separate.
Electron microscope image capture via microcontroller (with drill bit animation) ↗
Understand synchronization of scanning, signal sampling and pixel storage.
Apply it to this build
Use this repository’s ESP32 firmware and ADC timing, not the video’s controller pinout.
Review gun and HV integration
Identify cathode, filament, Wehnelt and anode from the actual gun documentation.
Before moving on
Qualified review must resolve heater isolation, grounding, insulation, interlocks and discharge before energized integration.
Project guide ↗DIY Scanning Electron Microscope - Electron Gun Detail ↗
Understand thermionic emission, electrode roles and gun bias relationships.
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Not a pinout for an unidentified gun or a UM6N4 wiring tutorial. Heater and Wehnelt supplies remain gun-specific.
Prepare a first specimen
Start with a simple conductive specimen and understand charging and signal contrast.
Before moving on
Confirm a clean vacuum-compatible mount; for specimen-current detection the holder must remain insulated from the stage.
Project guide ↗Introduction to the Scanning Electron Microscope (SEM) ↗
Review sample preparation and imaging on an established SEM.
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Commercial SEM holder grounding can differ from this insulated specimen-current holder.
Using a Scanning Electron Microscope ↗
Observe specimen handling and the general operator workflow.
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Commercial controls and operating values are instrument-specific.
Acquire and improve the first image
Use a staged commissioning log and separate real electron signal from pickup.
Before moving on
Compare beam blanked, intercepted and on; save raw data, repeat images and change one variable at a time.
Project guide ↗DIY Scanning Electron Microscope - Operation procedure ↗
See the end-to-end operating sequence on a homemade SEM.
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Use only after project commissioning and boundary qualification; do not copy its operating setpoints.
Electron microscope image capture with an oscilloscope ↗
Understand noise, dwell time, slow scanning and image capture tradeoffs.
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Oscilloscope acquisition differs from the ESP32/ADS1115 path; compare measured timing and noise.
No matching lessons. Clear the search or choose another stage.
Where videos end and your build begins
This is a curated learning path, not an exhaustive list of every SEM video or a validated assembly procedure. Titles, channels and direct links were checked in YouTube listings on 15 September 2026; the videos were not reviewed in full. Durations are included only where observed.
No verified video was found for assembling this exact UM6N4 controller, qualifying its interlocks, or selecting your gun-specific floating heater. Exact turbo operation, lens drivers and detector calibration still require the selected equipment manuals and project commissioning procedure. Watching a video does not establish electrical safety or measured imaging performance.
The CSV contains watch order, stage, priority, video source, learning objective, project caveat and the stage checkpoint.