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 5y 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

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 2y ago by Lorenzo Donati‭

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 2y ago by Lorenzo Donati‭

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 4y ago by Pete W‭  ·  edited 4y 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

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 4mo ago by Pete W‭  ·  edited 4mo 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

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

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 4y ago by Pete W‭  ·  last activity 4y ago by Olin Lathrop‭

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 3mo ago by Pete W‭  ·  edited 3mo ago by Pete W‭

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 2mo ago by Pete W‭  ·  edited 2mo ago by Pete W‭

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