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vfone: Thanks, those do describe the differences, but still leave some questions unanswered.
So, to conclude my first question, the main reason why a resonator is used here in place of a crystal is because crystals are a no-go at UHF. But as devices they *are* interchangeable. If that's the...
Hello.
I am trying to learn about oscillators by studying some RF circuits, and I have a few questions about a Pierce oscillator. A simplified circuit consists of a XTAL, two capacitors that provide load capacity, a feedback resistor, a power limiting resistor and an inverting element (see...
Hello.
I've been looking at some piezo elements with their driving circuits online, and I'm puzzled by a few things. A piezo element is supposedly a capacitive load, and, according to some forum posts, the polarity doesn't really matter. The manufacturers normally specify their rated...
Yes, yes, thank you guys, I get it now. :)
I've read a number of forums/websites and pretty much all of them mention that a mosfet and a fuse is a no-no. Although, I wonder, if I can get away with it by using an overcurrent-protected mosfet (like A or B) in series with a fuse until it blows...
Aggghhhhh! $#!%#$%!%
FvM: Thanks, I think you have a point. I came to the same conclusion regarding fast fuses and oversized mosfets. I'm using SOT-23's, but even most DPAK's can't seem to handle currents beyond 10 amps at 32V for more than about 100us. Sigh. I'll check out the high-side...
Alright, thanks a lot for all the info and suggestions. I learned a lot about fuses and their operation in this thread. I think I'll replace my mosfet with the other one I mentioned. That one has a 17A current pulse rating for 300us, that's 0.0867 A²s, which is 4 times the amount and well within...
Main concern, what I am trying to protect mosfet from:
Overcurrent caused by a short on the off-board lighting element
How fast does your fuse blow:
I don't have a fuse yet, I am selecting one. I've been looking at this one:
hxxps://www.belfuse.com/product/part-details?partn=C1F-1.25
(please...
Barry: This is the mosfet that I am currently using. It is rated for 2A continuous drain current according to the datasheet. I was going to use a 1.25A fast-blow fuse on it. How realistic is this scenario? You think I'd be better off by replacing it with one that has a higher current rating like...
Hello.
I'm designing a custom lighting control circuit and I want to know how to protect its outputs.
Suppose you have a DC load rated 1A@32VDC (light bulb or a LED+resistor) that is driven by a low-side N-channel mosfet. The mosfet can drive the load via a PWM waveform or simply act as an...
Hmm, all good points. Alright, thanks for the information. I think I have enough knowledge now to start building some circuits. I'll do some measurements to see the linearity.
Best regards!
-E
I see. So, how does the diode layout that you proposed (one "cathode up" diode from Vcc to IN+ and another from IN+ to GND) compare to the one I posted in my first post (two diodes in a diac-like configuration from IN+ to opamp output)?
Are you sure about the Schottky diodes? I've seen some circuits that are exactly what you're proposing, but I've also read on several pages that those diodes are very leaky and can impact the measurement significantly. They have a reverse current of several tens or even hundreds of uA compared...
Hello.
I'm designing a circuit to measure DC voltages that can be higher than what the ADC can handle. I already did some searching/googling, but I'd like to ask someone to verify, if what I'm doing is correct. The measured voltage span should be from 0 to 16V DC, and I only need continuous...
FvM: Please note that "but it's not clear which signal parameters you are looking for" is the result of "Audio DSP is something I haven't done before". I'm unsure what exactly I should be using here, so I just opted for amplitude because it seems to be the simplest choice. Should I use a square...
Hello.
This is a DIY project. I am trying to design a sound detector on a ATmega328P (20MHz) microcontroller (no, it's not Arduino). Audio DSP is something I haven't done before, at least not on *this* low level, thus, I would like to request some advice to see, if I'm doing things correctly...
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