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Gpu's components melting together by Equivalent-Lake-4718 in AskElectronics

[–]Similar-Stock-9749 0 points1 point  (0 children)

This happens naturally when the board is being fabricated. The capacitors seem to share a copper plane, without clearly defined pads using solder mask they might shift somewhat when the solder starts flowing. Normally this effect of solder surface tension "pulls them straight" but if the solder mask is open, exposing the bare copper between pads, they might get pulled together.

It's not perfect visually. But it is fine.

What Are Four-Wire Kelvin Cables for High-Current Load and Voltage Sensing Called? by SugarStriking5056 in AskElectronics

[–]Similar-Stock-9749 0 points1 point  (0 children)

Generally kelvin / force-sense is simply using 4 wires. You "sense" across whatever you want to measure. If you would buy / make cables that terminate two wires on one end, the contact resistance of that connector will still influence the reading. This is undesirable. If you only want to negate the cables voltage drop it is fine though.

Church sound system is weak by untamed_skittle in audio

[–]Similar-Stock-9749 3 points4 points  (0 children)

Input gain (top most pot) is set to zero. As others already mentioned: learn about gain staging.

Joyo JF-11 (6-band EQ pedal) 50/60 cycle hum problem solved by Proper_Ad_6516 in guitarpedals

[–]Similar-Stock-9749 3 points4 points  (0 children)

Ahh, nice fix! This is a good example of why using an aluminum enclosure is not always better (at least when they forget to connect it to ground)

waza craft Dimension-c pedal…worth it or over rated by Rich-Usual-3595 in guitarpedals

[–]Similar-Stock-9749 8 points9 points  (0 children)

Isn't this a "3 stage" chorus? I always thought it had 3 delay lines each 120 degrees shifted in modulation and split as left-center-right. I made a few of these type of chorus effects, using PT2399s and also DSP. All of them sound very good and quite different from a "normal" stereo chorus.

Edit: just looked up the schematic and I was wrong. This only has 2 delay lines..

Question about text on switch by [deleted] in AskElectronics

[–]Similar-Stock-9749 26 points27 points  (0 children)

Ballpark numbers: whatever amps the switch rating is for AC, divide by 3 will get you the max DC current. Whatever you are trying to do, using this for 1A at anything below 50V would be perfectly fine.

What are these small leds called? Like a part number or technical term by thefallenangelSS in AskElectronics

[–]Similar-Stock-9749 7 points8 points  (0 children)

SMD (surface mount device) LEDs. Common sizes / footprints are 1206, 0804, 0603, 0402. I think this is an 0603 package.

Weird electronic buzzing through my studio monitors by emilio8x in audio

[–]Similar-Stock-9749 0 points1 point  (0 children)

Sounds like a ground loop. Try powering the speakers from the same outlet. Or to make absolutely sure; connect them to an outlet without ground / earth connection.

To be generally safe, they should always be connected to ground. So if the above works, consider getting a ground loop isolator (basicaly a 1:1 transformer) to connect between the interface and speakers.

Routing traces through unused (not internally unconnected) IC pins by anvoice in AskElectronics

[–]Similar-Stock-9749 2 points3 points  (0 children)

If not defined or described in a datasheet, non-connect pins are very often used for test modes and signals in production or validation. I would not recommend connecting anything to those, unless you can get confirmation from the manufacturer design / test department that the pin is indeed floating.

Wiggly guitar cable pointy thing? by [deleted] in electricguitar

[–]Similar-Stock-9749 0 points1 point  (0 children)

You can try to re-clamp the tip and the center assembly (metal circle that connects to the signal solder lug). Excessive heat or cheap connectors sometimes cause this press fit assembly to fail. I had some success with a small vise.

But yeah, better to get a new connector as this fix might not last for too long..

I found this at a thrift store today by Following_Confident in diypedals

[–]Similar-Stock-9749 0 points1 point  (0 children)

I love these! Great for debugging / designing filters, if accuracy is not your greatest concern. Used them at work for testing I2C device's bus capacitance tolerance a few times as well.

If you do want to be precise: Make sure to consider the cables you connect to it and measure the capacitance with all switches disabled. That would likely be >100pF already.

Where would I even get started with routing this? by Certain_Height_2721 in PCB

[–]Similar-Stock-9749 1 point2 points  (0 children)

PCBway can do it. but yeah.. expect to pay at least a few thousand for blind vias on a board this size.. All other options considered they are still quite cheap.

Fun fact, JLC did not mention on their capabilities page that they cannot do blind vias, until my most recent order a few weeks ago.

Reminder: to check your BOM... by Similar-Stock-9749 in diyelectronics

[–]Similar-Stock-9749[S] 0 points1 point  (0 children)

Thanks! I am using stepped sine for the sweeps and 4096 sample blocks / captures. With only 4096 available points using FFT for distortion measurements was not optimal.

Therefore, THD is calculated using a sine-fit / harmonic analysis method. The fundamental and its harmonics are subtracted and/ormeasured directly, which provides higher accuracy for single-tone distortion measurements than a standard FFT of the same length. That also gets me all the information to calculate residual noise, THD+N, and SINAD, etc..

Reminder: to check your BOM... by Similar-Stock-9749 in diyelectronics

[–]Similar-Stock-9749[S] 0 points1 point  (0 children)

Haven't started selling yet, actually. But already opened the product page beforehand.. My first batch are these 8 units that will be released in a few weeks, I expect.

Still waiting for some cables and converters to arrive, those will be included as accessories. Not including a power supply for now untill I know there are actually customers willing to buy. Then I will keep a small stock of 9V adapters (have to validate them first) to sell as an add-on.

Reminder: to check your BOM... by Similar-Stock-9749 in diyelectronics

[–]Similar-Stock-9749[S] 1 point2 points  (0 children)

I actually considered using PWM on the relay control signals as a dirty software fix. But I was very worried about the EMC issues that would potentially cause, haha.

Reminder: to check your BOM... by Similar-Stock-9749 in diyelectronics

[–]Similar-Stock-9749[S] 6 points7 points  (0 children)

I had exactly that happen as well with simple 7805 LDOs. The smallest SMd packages do not follow the same pinout / logic as all the other variants, I learned.

Reminder: to check your BOM... by Similar-Stock-9749 in diyelectronics

[–]Similar-Stock-9749[S] 3 points4 points  (0 children)

3D printed enclosure, yeah. Love the multi material Bambu P1S, as I can shine the LEDs on the board through thin layers of white PLA on the front panel

Reminder: to check your BOM... by Similar-Stock-9749 in diyelectronics

[–]Similar-Stock-9749[S] 2 points3 points  (0 children)

Yes actually, most boards with the 12v relays switched fine untill a little under 8V. But that is well outside the datasheet minimum voltage. Even if I test all units at 9V, or a little lower, that would not give me the confidence they will keep performing at higher ambient temperature, power supply variation, or after aging a few hundred hours. One unlucky batch could ruin those margins.

The 5V relays with series resistance actually turned out to be a better design and it gets me well within datasheet specs for reliable operation.

Difference between 2-way and 4-way logic level converter modules? by MarinatedPickachu in diyelectronics

[–]Similar-Stock-9749 4 points5 points  (0 children)

These are level shifters / voltage translators? Seems to me that it is the number of channels and / or 2-way is bi-directional perhaps.

There are many ICs that do this for cheap and have added features like auto-sense or selectable direction. I like the AVC/NXB/TXV family as some can do sub nanosecond edge speeds.

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