misk94555‭

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...

2 answers  ·  posted 1y ago by misk94555‭  ·  last activity 1y ago by Conrado‭

Once in a while in literature I see a DC offset subtraction 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 photo...

2 answers  ·  posted 2y ago by misk94555‭  ·  edited 1y ago by misk94555‭

Consider a device with a microSD card. The microcontroller writes to the SD card periodically. The operators have an ability to remove the microSD card at any time (they will be removing it every...

1 answer  ·  posted 12mo ago by misk94555‭  ·  edited 4mo ago by misk94555‭

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...

3 answers  ·  posted 1y ago by misk94555‭  ·  last activity 1y ago by Gnomo‭

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 schema...

1 answer  ·  posted 2y ago by misk94555‭  ·  last activity 2y ago by Olin Lathrop‭

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 dri...

1 answer  ·  posted 1y ago by misk94555‭  ·  edited 1y ago by misk94555‭

I’m trying to understand the biasing of a 2-terminal electret condenser microphone.  The inner workings of a 2-terminal electret microphone are always drawn without a resistor at the JFET source.  ...

2 answers  ·  posted 6mo ago by misk94555‭  ·  last activity 6mo ago by Andy aka‭

I’ve a linear sensor array (broadside). The array is 10m long and it contains 20 sensors. There’s a limit on the number of wires. I can have a handful of wires running the length of the array, b...

1 answer  ·  posted 4mo ago by misk94555‭  ·  last activity 4mo ago by Olin Lathrop‭

I was looking for electret condenser microphone preamp topologies. I’d like the preamp to run on a single supply, so I’ll have to introduce an output offset. Saw two topologies for introducing th...

1 answer  ·  posted 3mo ago by misk94555‭  ·  last activity 3mo ago by Olin Lathrop‭

I’m looking for circuits which convert differential current signal into single ended voltage. If found two topologies in application notes, and though of one more [obvious] topology myself. How d...

1 answer  ·  posted 3mo ago by misk94555‭  ·  last activity 3mo ago by Olin Lathrop‭