Activity for Pete W
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #280537 | Initial revision | — | over 3 years ago |
| Question | — |
MOV vs. TVS diode 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 routinely check as an option in e.g. 24V DC systems? (more) |
— | over 3 years ago |
| Comment | Post #280454 |
@Lundin , there's a lot of truth to that. At this scale, a streamlined programmer is a "nice-to-have". I'm trying to think ahead, get the technique down, etc. Having the ability to flash it in-house (even if pre-programmed) is valuable no matter what. We do lots of product variations and connecting t... (more) |
— | over 3 years ago |
| Comment | Post #280458 |
Very cool! Thanks so much. I will take a look at the details in the link you provided. PS- I would have to characterize this as "pretty fancy" : ) I like the safety switch on the hold-down latch, and the chamfered guides in the second-to-last picture. (more) |
— | over 3 years ago |
| Edit | Post #280454 |
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| Edit | Post #280454 | Initial revision | — | over 3 years ago |
| Question | — |
recommendation for chip programming connection (pogo?) 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 threatening to go to 1000). The economics here are such that part cost is a secondary concern. I don't feel re... (more) |
— | over 3 years ago |
| Comment | Post #280393 |
Not sure if this way of faster turn-off would be important for a relay, maybe better achieved with a SSR? I found it useful for a solenoid that produces some mechanical action. The advantage of a TVS (avalanche diode) vs a zener, I'm not sure. In principle it is an opportunity to reuse a part that is... (more) |
— | over 3 years ago |
| Comment | Post #280393 |
I have used the TVS and schottky in series (pointing opposite way), for higher turn-off voltage in the coil. No obvious problems after it was appropriately sized. The catch is that the power dissipation in the TVS is higher in proportion to its voltage drop. With rapid cycling, the package size that ... (more) |
— | over 3 years ago |
| Comment | Post #280327 |
I always wondered too... [article](https://www.ecmag.com/section/systems/look-fiber-optics-above-you) ... apparently, the extra length of line is so that fiber splicing can be done on the ground ??? (more) |
— | over 3 years ago |
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| Comment | Post #280152 |
Thanks! That makes it look a lot better. (more) |
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| Comment | Post #280152 |
No problem! Added the green clock waveforms to show this visually. It can also be done with an AND gate, which is more intuitive, but the XOR gate produces a 0-100% PWM, while the AND gate only 0-50%. Regarding the LaTex -- that would be great! (if it isn't much trouble.) I never learned how to do ... (more) |
— | over 3 years ago |
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