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 6y 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 5y ago by Pete W‭  ·  last activity 5y ago by Olin Lathrop‭

What follows is a proposed concept of a simple (in principle!) way to generate a fixed-amplitude triangle wave, using two clocks, an XOR gate, and not using any processor cycles. It is practical i...

posted 5y ago by Pete W‭  ·  edited 5y ago by Pete W‭

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 5y ago by Pete W‭  ·  edited 3y ago by Lorenzo Donati‭

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 5y ago by Pete W‭  ·  edited 3y ago by Lorenzo Donati‭

immediate comments, going left to right in circuit: C61 ... can form undamped LC with input wiring, and thus overshoot to nearly twice Vin on plugin (or more likely some V a bit above Vbr at whi...

posted 11mo ago by Pete W‭  ·  edited 11mo ago by Pete W‭

The simplicity of zero-crossing measurements is attractive. Regarding "Full period" zero crossing (i.e. time between rising-zero-crossings, or between falling-zero-crossings), compared to "half pe...

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

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 5y ago by Pete W‭  ·  edited 5y ago by Pete W‭

Question about relative humidity specification for electronics. Industrial automation, indoors, cabinet or instrument enclosure. The failure mechanisms at the upper limit are fairly intuitive. I'm...

0 answers  ·  posted 2y ago by Pete W‭  ·  edited 2y 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 5y ago by Pete W‭  ·  last activity 5y ago by Olin Lathrop‭

The USB chip will obviously be fine, and so will that MCU at most speeds. In practice the USB VDD coming out of a computer will be pretty well regulated at low frequencies. One concern is when usi...

posted 9mo ago by Pete W‭  ·  edited 9mo ago by Pete W‭

Inrush, overcurrent, fuse, etc: That hot-swap IC has both current limit (ie for diode and fuse) and MOSFET-power limit, and the time to blow the fuse is longer than timescales of the semiconductors...

posted 10mo ago by Pete W‭  ·  edited 10mo ago by Pete W‭

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 5y ago by Pete W‭  ·  last activity 5y 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 5y ago by Pete W‭  ·  edited 5y ago by Lundin‭

If the main function is logic and activation of on/off signals, and the number of output combinations and their timing needs are not prohibitive, The minimal test with actual mcu hardware, actual r...

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