Recent content by mearvk

That formula is about power as a function of current and resistance. It says nothing about heat loss at higher current.

What law says there's power loss proportional to current squared? No, didn't have specific application in mind. Thanks.

Couldn't we just say the voltage could be variable, hold that as a constant, and design circuits which could run off completely safe 12v systems? Why not use fractional resistors to get the amperage to an arbitrary value? In other words could you just make a resistor valued at, say, 0.10...

1. I have a car that has some electrical/electronic weirdness; the basic issue is apparently parasitic draw of about 2.5amps @ 12v. When I connect the (problematic) component the chassis ground (connected to battery ground) what I observe is that the battery chassis jumps from 0v to something...

Thanks to you both for replying. If I understand you correctly my question would be why would we need two pins and an op-amp to feed a voltage back to the VCO when presumably it could all be done in the PLL chip. I find the whole thing a bit disheartening TBH. It seems to me that, for...

So couple questions. My assumption is that a radio antenna gets bombarded with all frequencies at the same time. So there has to be a discriminating circuit with a radio to act as a frequency filter. Well could I do this naively with a low pass filter and a high pass filter together? In...

That's a nice animation. The little green chip at the very end is a miniature capacitor?

Thanks but I'm not at the point where I can look at that picture and see anything other than noise in terms of the inferable system logic.

Thanks Sophie and Jim. It seems that he implemented a high-pass filter but, based on the article, he meant to implement a low-pass filter: "The signal conditioning circuit consists of two identical active low pass filters with a cut-off frequency of about 2.5 Hz. This means the maximum...

Hello. Ignoring my possible lack of correct terminology my question is about reading circuit diagrams in terms of understanding what they do, instead of just understanding how they are to be built. Have a look here: http://embedded-lab.com/blog/?p=1671 If you look in the middle of this...

Ok, so I found another issue. The scope's setting for voltage/div greatly affects the amplified frequency. Moved it down to 1v for both input/output and the frequency is much more stable, albeit about 3x slower. Also, FFT pictures where you can see the square wave harmonic effect...

Alright, I had to go back to the original photo I took for reference because the circuit seems very finicky in terms of the ordering of the pieces. This could be poor observation on my part but I know it was frustrating. You can see that I have a monster cap in there. What I have observed is...

Thanks. Yeah that sounds more or less like what I was saying.

The idea of varying one thing but keeping others constant is central in scientific analysis. People want to know, other things constant, the effect of taking vitamins, smoking or drinking alcohol, just as examples. Is the idea of the partial derivative analogous to scientific empiricism's...

I did want to post that I have made considerable progress on this. I will post some more data this weekend if I can. Cheers.