Hi all,

I'm trying to finish the design of NOS (non oversampling) DAC project I am wroking on but I am facing some uncertainties with the output filter section. Given the nos use I'd like quite a sharp filter, and doing some simulations mostly chebyschev's come up but this seems not to eb the best choice given the impact on phase and time delay?

really looking for some ideas/help to define a few key aspects I should consider

Hi,

I have built a MOSFET flyback transformer driver. I am modulating the MOSFET with an Arduino GPIO at 17.86 kHz. Since I am using logic level signals from the Arduino, I chose the IRLZ44 logic level MOSFET.

The circuit drives the transformer well but I was checking the V_ds voltage with a scope (see attached) and noticed that the 60v max rating of the MOSFET is exceeded (100's of volts). I haven't burned out the MOSFET yet, but it seems like a possibility. Based on my understanding of a flyback driver, I should expect a several hundred voltage on the primary side of the transformer so perhaps I'm just really not using the right MOSFET for the job. A couple questions:

1. Is burning out the MOSFET a valid concern?

2. Can I add protection circuitry to the drain-source?

3. Is there a better MOSFET option that could be used with Arduino logic levels and a 3.7v source?

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https://preview.redd.it/1zddt7rbyzxc1.png?width=1171&format=png&auto=webp&s=eaa571d0580ddeb421e214b3fc66be87e7cad50d

https://preview.redd.it/zblqx8rbyzxc1.png?width=320&format=png&auto=webp&s=f9840198986e4fb006b157c727b33042ae06846d

Hey all - I'm looking for a part number for a connector on this sensor board. https://www.makerguides.com/jsn-sr04t-arduino-tutorial/

The connector in question is the white on on the bottom side of the board. It looks like a JST 2-pin (like the ones commonly used for batteries), but I'm not sure. Does anyone have any ideas? Thanks :)

What is this connector called? Where can I find the little plastic piece that was sitting between those 4 pins? Thank you

I need to turn off and an electric boiler that pulls more or less 2KW, the mains voltage is 230V so there's going to be 8.7A passing though the relay.

I have a bunch of those cheap relays that you can find in arduino kits (rated 240V/10A), but can I trust their ratings? I mean, is it safe or is it better if I choose a more robust relay to do the job?

https://imgur.com/a/puAH97N

Thanks in advance.

EDIT: The image shows up a relay rated 7A, my relays are almost identical, but rated for 10A.

The 1.6A, 12V, trickle charger for my car stopped working (the result of it sitting in the rain a few times) This is what I saw when I opened it. Might this be salvageable? Any suggested tips on how to go about cleaning this up?

Have anybody had success fixing the "RAM timing error" aka "orange light of death" on a Asus X570 Strix board?

https://preview.redd.it/9vvqv5idzyxc1.jpg?width=2048&format=pjpg&auto=webp&s=cbea2b39bfcbf972141e31e0b9c48ecfdccd2d49

I came across a toroidal inductor in a super high power 1000W LED driver, but after accidentally dropping a screw on the board, it stuck to the inductor core quite strongly. What is the use for an inductor with a permanent magnet core?

I printed what I thought was the right sheet and as I was looking through it I realized I had the datasheet for the 1633 :/ I'm not sure how similar they are so I'd rather find the correct datasheet. For context the MEC1653 is the controller for a myriad of things on the thinkpad T480 but specifically it controls interactions with the keyboard and I'm trying to do some research in preparation for a keyboard mod I'm working on. I managed to find the schematic for the mobo itself which has a three page explanation of the pinout for the mec1653 but doesn't have much detail beyond that. I'm really hoping for a datasheet of some sort but any info would be greatly appreciated.

I've looked in a few places most notably vinafix as another person in the past who was working on this mod linked to a post on that site that claims to have a download for it. Unfortunately it's behind a paywall and I can't tell how much I trust the site. If no one can find anything I may just risk it but hopefully there's a decent alternative somewhere.
Thanks!~

I am building a robot that will follow me around, what can I use to make this happen? The robot basically follow behind me until it reaches a certain distance (this is ok, its the following that idk what to use) and I cannot use machine vision for this. Will be using a microprocessor as the brain.

Thank you in advance

Hi, I am hoping someone can help me ID locate a replacement mosfet for an ASUS FA506 laptop motherboard. The markings are hard to read, I put some isopropyl on it to help read them. From what I can tell it reads ON DA25AL 22CA N9CC.

https://preview.redd.it/qn2mcap50yxc1.jpg?width=1170&format=pjpg&auto=webp&s=a39873802d873bba61d2f65279e39897514dd1f6

https://preview.redd.it/n78gpbp50yxc1.jpg?width=1031&format=pjpg&auto=webp&s=713a94ec445b98f685e5a289338d6604fd0c48ff

I tried searching for these on the onsemi site with no luck. Any help is appreciated.

I have a "fight stick." It is a joystick with eight pushbuttons.

I have wired a remote switch in parallel with one of the buttons so I can trigger it with my foot. The external momentary switch is connected by plugging into a 1/4" female jack. (unbalanced music cable)

Currently, when the external switch is attached, both are operable. (This is against rules, otherwise it works great.)

The desired behavior is to disable the internal switch when I plug in the external footswitch. I know I can install a toggle that would disable the internal button, but it seems like there should be a clever way to have plugging in the footswitch disable it.

Any ideas?

Beginner here, I have been working on a 4 bit calculator with 2N2222 transistors, I need to order more, I was wondering if I can use BC547 (because they are cheaper). The BC547 have less values compared to 2N2222, but I am anyway going to use 5v or 9v power supply, will it matter in this project?

Considering future projects too, should I stick to 2N2222 or get the other ones, I was even considering a assorted box.
Thanks in advance for your help :)

My multimeter shows OL in one direction and 0.088V in other direction on diode setting. This is tested out of circuit and the spec sheet shows a Vf of .32-.36. Am I reading the Vf when I test with a multimeter in diode mode? Does 0.088V indicate that the diode is bad? Thank you for any info.

Looking to wire up some lights and I want to use a connector such as these but I don't know what they're called. I'd also like to buy some I can pin myself vs. a pigtail like these. Thanks!

My goal is to attenuate the primary voltage overshoot/spike caused by the transformer's leakage inductance, as efficiently as possible, so I was looking at both RCD clamps and RC snubbers and trying to understand their effects on the circuit. I notice RCD clamps are used pretty much universally in flyback converters over RC snubbers, and I'm not entirely sure why, as to me they seem to accomplish the same goal.

Why are RCD clamps so common? Are there scenarios in which RC snubbers are superior in terms of efficiency, or any other case? Does any of this tie to switch turnoff dv/dt?

Dimensions are 1/4”x5/8”. The ends have a Black plastic appearance like a capacitor. I get a reading of 22uf on the largest and 5.7 if on the smaller. It operates at 12vdc. The smaller of the two smoked so I am looking to replace, problem is there is no writing anywhere to indicate. Only things I have found close to looking the same are axial bipolar filter capacitors, is that correct?

I'm curious if there's certain componets that are subject to going "fault" when generating heat.

If a power supply was blown and replaced what you could see "broken" would you be inclined to say there's possibly other broken parts that only break down when heat it applied.

Can someone identify what this module is? it is labelled BK_PWMS_4D. Input is PWM. Output is the processed PWM without a ground. The processor is completely unmarked. The diodes might not be the type indicated. What sort of processing might you want to do with a PWM?

https://preview.redd.it/rtdvhpy31wxc1.jpg?width=800&format=pjpg&auto=webp&s=befdc03ef9387656fe443713f3ea52a67035d2ca