Build
Build
The rest of this site is ideas. This is what I have built or helped to build — instruments made so neuroscience can ask a question it could not ask before, and occasionally the reverse. Each entry says which part was mine.
- MPS-TMS Modular pulse synthesizer for TMS A 2.8 kV, 6 kA modular stimulator that synthesises the TMS pulse instead of inheriting a capacitor discharge, making shape, timing, and rate all commandable.
- Output voltage
- 2.8 kV
- Output current
- 6 kA
- Pulse shapes
- Monophasic, biphasic, half-sine, arbitrary
- Protocols
- Single, paired-pulse, theta burst, arbitrary timing
Power stage and control design, waveform synthesis and quantization, closed-loop experiment pipeline.
- AMPS Asymmetric modular pulse synthesizer Giving each module its own voltage instead of making them identical, so three modules beat six at waveform fidelity — the module count is what keeps these stimulators in the lab.
- Modules
- 3 (asymmetric)
- Distortion vs. symmetric 3-module
- −13.4 percentage points
- Distortion vs. symmetric 6-module
- −4.5 percentage points
- Topology
- Cascaded bridge, switched-capacitor charging
- Test waveform
- Gaussian polyphasic
Concept, module-voltage optimization, cascaded-bridge prototype with switched-capacitor charging, device characterization and measurements.
- MOANA Wideband power amplifier for magnetogenetic stimulation A 5 kW amplifier flat from DC to 5 MHz, built on GaN devices, so magnetogenetic stimulation can address many frequency channels at once instead of one at a time.
- Output power
- 5 kW
- Output bandwidth
- DC – 5 MHz
- Devices
- GaN, 5 MHz hard switching
- Channel range
- 5 kHz – 5 MHz
The power amplifier — the GaN output stage delivering kilowatts across a DC-to-5 MHz bandwidth. A collaboration with Rice; the wider MOANA effort is theirs.