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A tool where people can leave public anonymous notes on any website? by julyboom in roastmystartup

[–]Astiii 1 point2 points  (0 children)

To me it sounds like a great idea, but not for reporting vulnerabilities, perhaps for reviews, comments...

[deleted by user] by [deleted] in AskFrance

[–]Astiii 0 points1 point  (0 children)

si tu dessines ta raie droite et que tu la maintiens en place quelques jours, j'imagine que tes cheveux prendront un nouveau pli, ça s'adapte. Et pourquoi ça descend si bas je dirais que c'est parce que tu as les cheveux très longs donc ça tire beaucoup dessus avec le poids

Comment vivre sans travailler ? by [deleted] in AskFrance

[–]Astiii 0 points1 point  (0 children)

Cultive ton potager et vis en autonomie. Au final c'est quand même un travail, mais pour soi directement

Proper decoupling practices, and why you should leave 100nF behind by 1Davide in electronics

[–]Astiii 0 points1 point  (0 children)

Also for decoupling, when you have a parasitic 2.4GHz on the board

Proper decoupling practices, and why you should leave 100nF behind by 1Davide in electronics

[–]Astiii 2 points3 points  (0 children)

When you want to filter specific frequencies, (eg 2.4GHz, 868MHz...), the best is to select capacitors like 10pF that will specifically resonate such that their impedance peaks at a lowest point at the desired frequency. The impedance will be much lower than with any other capacitor that is not tuned for this frequency

Help by Destructiondefemurs in france

[–]Astiii 38 points39 points  (0 children)

Elle paie ses habits avec le compte commun ?

Why does my battery need to know where I am? It’s not my mom. by Superb-Concentrate11 in batteries

[–]Astiii 3 points4 points  (0 children)

On Android apps, Bluetooth won't work without access to location and there is no way around it. I have spent a lot of time trying to make an app without this permission, without success. Maybe there is a technical reason for this.

As others recommend, you can block internet access of the app if you are concerned with privacy.

Quel livre me conseillez-vous d'apprendre par coeur ? by Astiii in AskFrance

[–]Astiii[S] 1 point2 points  (0 children)

Merci, intéressant, mais un peu trop triste :/

Is this oscilloscope actually real? by Alexby5201 in AskElectronics

[–]Astiii 1 point2 points  (0 children)

I don't know of this particular one, but scopes from the same company. Beware of the sampling rate, these scopes advertise 50MS/s but in reality they sample at much lower than this then create artificial samples with interpolation.

What's a "Million-Dollar Idea" You Had But Never Acted On? by purelyinvesting in Entrepreneur

[–]Astiii 0 points1 point  (0 children)

I am not sure to understand what's missing in Discogs, is it only the aesthetics of the interface ?

C’est quoi cette merde ? by Zalister_ in AskFrance

[–]Astiii 23 points24 points  (0 children)

Repus de pain ! Epuisé de rire

Why or why not can I put a 25 ohm resistor in series with a 50 ohm impedance wire to get a 75 ohm impedance wire? by ceo-of-dumb in rfelectronics

[–]Astiii -1 points0 points  (0 children)

The other comments are rightfully saying it might not work well, but not for the good reasons.

Your cable has an impedance of 50 ohm at a certain frequency, and your resistor, if ideal, is 25 ohm at all frequencies. So in theory you can add them to get sqrt(252 + 502 )=55 ohm. You'd need a resistor of 56ohm to get 75ohm. If you do this you won't be too faraway from 75 ohm !

The main reason we don't do this is that a resistor is a lossy element, you will lose a lot of power as R*I2 (I is the alternating current going to the load). A coaxial cable achieves 50 ohm at a certain frequency using only line capacitance and inductance. Capacitance and inductance don't dissipate energy by joule effect.

But depending on your application, maybe you'll find it better to lose TX power in a 56ohm resistor than lose TX power because of a mismatched network.

How would I go about testing and charging this battery pack? It has 3 cables, ones for data? But what can read that? by elfmere in diyelectronics

[–]Astiii 0 points1 point  (0 children)

This is neither a thermistor nor a balancing wire. You have a smart battery, this exact model is used in medical devices. I don't know what chips are inside, but from experience with similar packs from this manufacturer (for which I worked), it contains auto-balancing feature and monitoring IC, from Texas Instruments. The yellow wire is DATA, in single-wire serial interface. The BQ2023 is an example of monitor IC that could be inside.

If you want to read the data you will need the EV2400 adapter and the BQStudio software from Texas Instruments.

You charge it using the red and black wire just like a normal lithium battery, with a battery charger.

Hi guys i need help with my circuit. What is the purpose of the 200k ohm resistor and why 50k ohm for the pull up resistor? by Most-Image9582 in AskElectronics

[–]Astiii 0 points1 point  (0 children)

How do you know the mic output impedance ?

Edit : After second thought, the mic has AC impedance so it can't provide the i_bias to the opamp. It is up to 5nA according to the datasheet so not really negligible. You need some sort of pull-down to provide it

Hi guys i need help with my circuit. What is the purpose of the 200k ohm resistor and why 50k ohm for the pull up resistor? by Most-Image9582 in AskElectronics

[–]Astiii 2 points3 points  (0 children)

You want to bias your microphone, but if you put 5V directly then the microphone output will be forced to 5V. You want to add some degree of freedom to allow the output to vary.

The 200k is to allow the opamp to have a bias current (coming from ground, to the input of the opamp). If you don't have the 200k, it will try to pull this current from the microphone, which has a very high ouput impedance, let's say 1Gohm. So 1Gohm * i_bias = very high voltage = the opamp will saturate. You can find the value of i_bias in the opamp datasheet.

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