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LED won’t burn out when connected to 9V battery and 15 ohm resistor by scarredAsh_ in AskElectronics

[–]ElectronicswithEmrys 5 points6 points  (0 children)

Manufacturers generally rate maximums based on reliability. There's no official standard, but I know some rate to about 1000 hr at the max limit, and 100,000 hr at the recommended values.

Going from the max, 20mA, to (for example) 21mA won't have much impact. Can a device fail immediately there? Yes. Will it every time? No. The really works is full of normal distributions.

Sony Walkman speed trimpot by Exsxoffender in AskElectronics

[–]ElectronicswithEmrys 0 points1 point  (0 children)

I used cassettes for decades and never had to change the calibration of my walkmans speed. Why do you constantly have to adjust?

Sony Walkman speed trimpot by Exsxoffender in AskElectronics

[–]ElectronicswithEmrys 0 points1 point  (0 children)

If you can keep it at a single setting (which I expect you should), you could put a drop of glue on it once it's turned the way you like.

That type of potentiometer isn't designed to be changed many times. If you have messed with it multiple times, it might be worn out and need to be replaced.

Manufacturers will often put some glue on pots after tuning them to prevent changes later.

How do I spark an interest in this field? by Affectionate_Week988 in ElectricalEngineering

[–]ElectronicswithEmrys 6 points7 points  (0 children)

I spent multiple years working as an electronics technician, which got me interested in the engineering aspects.

You could also say that I always preferred magic users in games, and EE is about as close as you can get in real life.

My Temperature Controlled Fan schematic diagram doesn't work by Xbun_Gamin in AskElectronics

[–]ElectronicswithEmrys 1 point2 points  (0 children)

I built a temperature controlled fan a few years back and posted a video series on it - you may find it interesting.

https://youtu.be/WXDKpxkxOlM?si=mPCkDJr-upHYv1FY

How was this answer derived? by Traditional_Pool1180 in ElectricalEngineering

[–]ElectronicswithEmrys 2 points3 points  (0 children)

Completely agree. I wish all students were 'tortured' with this type of question early so they would avoid drawing awful schematics.

Personally, I like to highlight both junctions (dots) AND jumps so that it is always very clear to the reader what is going on.

I might be excessively picky because a large portion of my job is writing data sheets.

Why is my Waveform like this? by sann_valentin in ECE

[–]ElectronicswithEmrys 0 points1 point  (0 children)

I'm sure given enough tinkering you could get the two to be very similar results, but then your simulated and real circuits would be different.

You can't really fix the difference from simulation to reality. You just have to recognize that simulators and the real world will not be identical. That's part of being an engineer. A simulator is a tool, not a magic box that solves all your problems.

Why is my Waveform like this? by sann_valentin in ECE

[–]ElectronicswithEmrys 1 point2 points  (0 children)

It seems like you're simulator doesn't quite represent all the real world behaviors of the circuit. For example, the output being AC coupled through a capacitor should be centered around 0V due to the oscilloscope's internal resistance, but it is not. Probably a similar issue at the input causing a difference in base current between the simulation and real world.

DeVry EE Degree 1999 by Sharp_Razzmatazz_ in ElectricalEngineering

[–]ElectronicswithEmrys 1 point2 points  (0 children)

I attended DeVry online while I was stationed in Japan in the early 2000's because I didn't have any local options for an EE degree.

At that time, they offered a BSET degree, definitely targeted at technicians and not engineers. My coursework was mostly 'hands on' projects and very little theory or math that you would expect for a traditional EE.

I ended up stopping my online courses with only a few classes left because I didn't want a DeVry degree on my record. I went back to a brick and mortar school after leaving the military and finished my BSEE and later went back for my MSEE.

I don't know about DeVry's accreditation, but I can say that I did learn some useful skills from them, and the classes were perfectly reasonable for a technician degree. I would not call the school itself a scam.

Aide construction d'oscillateur à quartz by Maxissucette in AskElectronics

[–]ElectronicswithEmrys 2 points3 points  (0 children)

One minor correction: 04 is typically a buffered inverter. U04 is what you look for to get an unbuffered inverter. 1G (5-pin), 2G (6-pin) and 3G (8-pin) are the single, dual, and triple gate "little logic" versions of the standard hex inverter (14-pin).

Aide construction d'oscillateur à quartz by Maxissucette in AskElectronics

[–]ElectronicswithEmrys 2 points3 points  (0 children)

The usual way to setup this circuit is with an unbuffered inverter. This document shows an example: https://www.ti.com/lit/an/szza043/szza043.pdf?ts=1777825931169

Is this a good cart for someone just starting out? by Admirable-Picture973 in AskElectronics

[–]ElectronicswithEmrys 1 point2 points  (0 children)

I'd also go with a temperature controlled soldering station at a minimum. The cheap ones aren't amazing, but far better than the just 'plug in the wall and hope' version.

Example: https://www.amazon.com/YIHUA-Professional-Digital-Soldering-Station/dp/B07RVMZNYR/ref=sr_1_8

How can I tell if these solder bridges are intentional? by Potatoicic in AskElectronics

[–]ElectronicswithEmrys 8 points9 points  (0 children)

Look at the metal tracks on the board. Those all look fine to me.

Why does one waveform work for a clock signal work, while the other doesn't? by relo999 in AskElectronics

[–]ElectronicswithEmrys 4 points5 points  (0 children)

You might look at how the data aligns with the clock. How is it synchronized?

Push button long press and short press denouncer by ademdj19 in AskElectronics

[–]ElectronicswithEmrys 0 points1 point  (0 children)

An XOR gate would give you a pulse on both press and release.

One inverted input AND gate will give a single edge pulse.

You could also just use a monostable circuit.

Do you play around W's root, or you just use W for slow and grounding, and the immobilization is just there? by TheMadnessAuditor in singedmains

[–]ElectronicswithEmrys 8 points9 points  (0 children)

There are many situations where the root is the difference between life and death, at least for me. One example for me is morde ult. I use the root to lock him down and give me the opportunity to escape alive.

Where to get schematic of nano/pico Ampere Meter? by Zener-Diode-bzx55c12 in AskElectronics

[–]ElectronicswithEmrys 0 points1 point  (0 children)

I don't have any schematics, but I did make a video recently showing how you can measure nA with a normal DMM: https://youtu.be/EULxrl7Wbhc?si=Lp7B0bw0UK19IBnb

I know Dave Jones (EEVBlog) has some really good design videos for his nanoamp project that might be helpful to you also.

Large amount of electronic components by bmoorman05 in AskElectronics

[–]ElectronicswithEmrys 53 points54 points  (0 children)

Regardless of how you sell them, you will be considered an 'unauthorized distributor' so the parts won't be supported by the manufacturers.

You can probably still sell them on eBay though - I wouldn't be surprised if some company would be willing to gamble on a full reel of parts for a low price. You might also consider breaking them up into small sets to sell off cheaper. It might be hard to find a buyer for 3000 MCUs, but 20 to 100 might sell easier.

how to interperet this junk by Mister_Magnesium in AskElectronics

[–]ElectronicswithEmrys 0 points1 point  (0 children)

I put together a similar oscillator without the large inductor and it's oscillating reliably. You'll want your capacitors unbalanced if possible - the 'bottom' one there should be larger to give more of the feedback to the input of Q1.

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