Teflons have higher 3rd order harmonics. OPA2134 must work better in servos than other stuff, it’s a real dog in phono stages.
My cap choice is 940C so far. If I find something better it’ll be interesting.
My cap choice is 940C so far. If I find something better it’ll be interesting.
AKM is barely any better. Their datasheets are not amazing compared to AD, TI, or Cirrus (at least for audio parts). I believe they hold back the full datasheet for serious customers. I will give them points for adding Digi-Key as a distributor and at least releasing a basic datasheet.
From personal experience, Maxim and the like have parts that aren't even commercially advertised and you have to sign NDAs for, but the quality of datasheet is much higher. I suspect it's easier to get access to a good FAE too.
Nice. ;-)You win
Not sure that we don't all lose with the way we return back to electricity.
We could have standardized the batteries (plug and play) and transformed the service stations into charging halls. The way fuels are standardised.
All it takes is an automated mechanical replacement system so that in one minute, we have filled up with energy. Stopping the whole car to refill is stupid, don't-you think ?
Swapping the battery is doable and has been though off.
The problem is, who owns the battery a pretty expensive item.
Not the users, I presume, the batteries would be owned by companies providing this service.
My guess is that this business is not interesting for profit.
May be, here is the proof that the electric car is just for suckers.😀
The problem is, who owns the battery a pretty expensive item.
Not the users, I presume, the batteries would be owned by companies providing this service.
My guess is that this business is not interesting for profit.
May be, here is the proof that the electric car is just for suckers.😀
Don't know about Belgium, but France still has room for improvements: infrastructure problems. (Sorry, French only: short version: a BIG day for 300 miles)
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Is not this the case with some electric cars manufacturers, like Renault ?
It is the only logical way, as I see the things. Batteries need to have a second life, at a big scale, as energy tanks for renewable energies. And a third one as
lithium mines and other rare materials etc.
When everyone will have a Tesla, it'll be cool, the tail at the electric pump on the days of big departures on vacation. ;-)
Our world is more and more crazy.
Demian,
Current big project is microphones. As you pointed out capacitor types of signal sources are high impedance. Also capacitor coupled sources have the impedance rise as the frequency decreases. (Nothing new.)
As to noise level the thermal noise of a 100,000 ohm resistor at room temperature I get 41 nanovolts per hertz (doing in my head) sqrt (100,000/60), times 141 for the 20,000 hertz, so last night I must have made an arithmetic mistake.
Yes the distortion products are lower than the noise level, so it would make sense to lower the resistance to get the noise level down, probably to equal the capacitors distortion level. To raise the input impedance to not load the source can be done with positive feedback. (If I get it this does raise the noise level but by a square root of the noise function.)
When the TI guys stopped by they looked at where I put the DC blocking capacitor in the gain stage opamp feedback loop and were surprised I did not put it to ground but rather in series with the inverting input.
ES
For the English only Speaking, this video is a mix between "Houston we've had a problem" and a one long day long Monty python sketch.
Qui dira que les Français n'ont pas le sens de l'humour ?
In a communist state maybe, far too egalitarian, or would you have different classes of battery for different classes of customer? I can't see Mr Marsh pulling up in his electric Bentley and having a battery that's been in any Tom Dick or Harry's jalopy, can you? He has an ego to maintain.
John, it's not my study (but one I remembered), not having an AP of my own. Personally, I do not worry about DA for filters such as DC blocking caps in the feedback network as nominally the DC value across it is very stable and the AC signal is very low. AC coupling cap size obviously depends on loading.
As we all should know, the best test is to apply the part in service, so it all depends on what you need. Not sure why you need a 100k input impedance.
So, you are jealous because you don't have a Bentley ?
(What kind of pleasure do you take from attacking a member that cannot answer-you putting the discredit on him ?)
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Nevermind, it was a joke that I think he can take without you having to defend him every 5 minutes. Your holier than thou attitude does get tiresome.
It is not specially him, it is a general attitude that tires me on a public forum. You could have taken a funnier example. There is no shortage of ridiculous celebrities.
It must be a torture for you everyday to come here and subject yourself to such horrible forum. 🙁 Is there someone forcing you to do it?
Got it, sorry for not remembering that detail. Although it's worth scrolling down -- there's another plot with various loads and cap sizes. Notably, ensuring that there's essentially zero AC voltage across the cap (i.e. keeping the filter frequency very low) seems to be the trick.
Derfy,
What value capacitor do you need to have say 120 dB down voltage across the capacitor at 3,000 hertz with a 10,000 ohm input impedance?
Typical for a CD signal figure .002 volts at both 3,000 and 20 hertz.
I get 80 uF for 20 hertz. Pretty big as a film capacitor.
As an electrolytic with no DC across it....
One of the projects in the back room is rebuilding a Syncon B mixing console. It uses NE5534 opamps with every stage capacitor coupled. As there is no DC across them they turn out to be pretty much the factor that reduces performance.
What value capacitor do you need to have say 120 dB down voltage across the capacitor at 3,000 hertz with a 10,000 ohm input impedance?
Typical for a CD signal figure .002 volts at both 3,000 and 20 hertz.
I get 80 uF for 20 hertz. Pretty big as a film capacitor.
As an electrolytic with no DC across it....
One of the projects in the back room is rebuilding a Syncon B mixing console. It uses NE5534 opamps with every stage capacitor coupled. As there is no DC across them they turn out to be pretty much the factor that reduces performance.
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Then would you really consider how you could contribute to make the forum a nice experience for all?
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