#video by #NurdRage on the keychain-based radioisotope photovoltaic generator, extracting tritium vials from plastic keychains and using a Soxhlet extractor to remove the plastic encapsulation with dichloromethane, then removing the silicone from the ends with concentrated sulfuric acid. He put 14 of the glass vials side by side, totaling about 100mm with maybe 60mm length, sandwiching them between two amorphous silicon solar panels of that size with clear plastic tape. Open-circuit voltage 1.9 volts per panel, but only on the order of a microamp (per panel) short-circuit current. He put it in series with a 1MΩ current-sense resistor to measure the current more exactly, reduced to 893kΩ by the parallel impedance of his voltmeter, so he could measure the current accurately; short-circuit current was about 900nA, and the maximum power point was about 1.65 volts and 600nA, thus almost 1000nW, 1μW. With the second PV cell this increases to 1.23μW. The more sensitive circuit increased the measured open-circuit voltage to about 2.02V. Results with a monocrystalline cell peaked at 71nW at 70mV (when scaled up to the size of the amorphous panel) due to the cell’s poor suitability for low-light generation. #electronics #hardware #energy
95¢ #8051 #microcontrollers with 800ksps 10-bit ADC (or 12-bit at 200ksps), plus two analog comparators, USB, 700pJ/insn, 8K flash, 2.3K SRAM, 13 5V-tolerant GPIOs. #electronics #hardware #pricing
#FreeRTOS runs on some #8051 #microcontrollers
IDE for #8051 #microcontrollers including a simulator
#PDF #datasheet for Analog Devices ADR1001 ovenized LTZ1000 high-precision voltage reference #electronics #hardware. “The on-chip heater, combined with Analog Devices buried Zener technology, allows the ADR1001 to achieve sub-ppm temperature coefficient performance and single-digit ppm long-term drift performance.”
structured editing and navigation in #Emacs with #Tree-Sitter