Pete W‭

Real life example. The machine shop of the company where I work has HAAS VF2 milling centers. At 3.5 tons, you'd figure a big enough to warrant some care and respect. The favored method of data tr...

posted 2y ago by Pete W‭

posted 2y ago by Pete W‭  ·  edited 2y ago by Pete W‭

I recently realized something blindingly obvious that I'd overlooked for a few years - that I can generate a servicable PWM triangle wave from a micro by using two PWM outputs with timers set to sl...

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

Simple thing that I realized I should know but do not -- when is an MOV preferable to a TVS diode (with some associated network to really make it work, in both cases)? Is it even something to routi...

2 answers  ·  posted 2y ago by Pete W‭  ·  last activity 2y ago by coquelicot‭

My question is trying to understand if there is an effect on the switching time, on both turn-on and turn-off, between the following configurations. A mirror set up to switch a current, and there ...

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

This answer is regarding the resonance issue that C2 is fixing, and how it could be done with a smaller cap. There are two aspects of it. To start, consider the 5.6uH vs the 10uF capacitors. It ca...

posted 1y ago by Pete W‭  ·  edited 1y ago by Pete W‭

Background: I have several microcontroller based projects with custom PCB that have been in very-low-volume production, but the quantities are starting to go up. (batch sizes now ~100 and threateni...

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

Small-shop question here. Is there a convenient tool for making the bend shown below, other than a pair of pliers that happens to be just the right size, and is it worth it for qty low 100's? ...

1 answer  ·  posted 2y ago by Pete W‭  ·  edited 2y ago by Lundin‭

I'm wondering if there are particular aspects of an oscilloscope probe's performance that tend to suffer, or failure points to look out for, if/when buying lower-end makes of oscilloscope probes (l...

1 answer  ·  posted 1y ago by Pete W‭  ·  last activity 1y ago by Olin Lathrop‭

A bit of a tangent, but in mcu firmwares, higher order filters can also be implemented directly with biquad sections. More work to implement vs single pole, but very reusable. Although to be honest...

posted 2y ago by Pete W‭  ·  edited 2y ago by Pete W‭

UPDATED. based on clarification to original question. To be clear, just an idea, not tested for this situation! It is abusing the V_I_L margin on the 3.3V CMOS input, so series diode should be sc...

posted 2y ago by Pete W‭  ·  edited 2y ago by Pete W‭

PCB's and components are expected to be used with the common SAC solder, there's little reason to use SnPb, IMO. I learned on SnPb. After a brief transition for RoHS to re-calibrate the "feel" of i...

posted 2y ago by Pete W‭  ·  edited 2y ago by Pete W‭

What is causing this [ABC-news video via Twitter] spectacular power-line phenomenon? [image: still from ABC News]

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

I'd guess surge resistance and redundancy, rather than power dissipation. Looks like 10 stages of 5x parallel 2k going left to right?? So that's 10x400 = 4k. Perhaps used for parallel damping the...

posted 2y ago by Pete W‭  ·  edited 2y ago by Pete W‭