Activity for misk94555‭

Type	On...	Excerpt	Status	Date
Question	—	LED driver with feedback through light. Which feedback topology is better? I’d like to create a stable IR LED light source. I’ve read that LED efficiency changes with temperature. I’ve seen two designs which used feedback through light to correct the LED temperature drift and aging. They used slightly different topologies. The first topology has one feedback loop (thr... (more)	—	about 1 month ago
Question	—	PCB as a wall of an underwater enclosure Can a circuit board be waterproof enough to form a wall of a waterproof enclosure? Regular PCBs made of FR-4 with solder mask is what I have in mind. But I'm not barring less common PCB materials and processes, although I'd prefer something with moderate cost in moderate quantities. 10m dept... (more)	—	2 months ago
Question	—	Disabling breakpoints in real-time section of firmware Got a question about hazardous breakpoints in real-time firmware. Does C have a mechanism which lets me mark a section of code such that breakpoints are somehow ignored or not allowed just in that section? I’ve got an STM32 microcontroller which controls an LED flash. The LED current during th... (more)	—	9 months ago
Question	—	Choosing between common-drain JFET amplifier, and common-source Do common-source JFET amplifiers have an advantage over common-drain? The JFET would be in a low noise photodiode amplifier. The signal is 100us pulses with 10us raise times. Here are the schematics which I have in mind. The op-amp would be LTC6252 or LT6200. Single-supply operation is des... (more)	—	10 months ago
Question	—	DC offset correction loop (DC servo loop). What's its advantage, compared to a high-pass RC filter? Once in a while in literature I see a DC offset subtraction loop. instrumentation amplifier with a DC servo loop Here are a few more examples. DC servo loop removes a DC offset after an op-amp. DC servo loop removes DC current from a photodiode. What are the advantages of such DC offset re... (more)	—	12 months ago