Recent Posts

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Projects, Designs, and Technical Stuff / Re: Is this circuit adequate to interface a uC with a dc motor using an optocoupler?

« Last post by Retirednerd2020 on Today at 07:40:41 pm »

I think you can eliminate one of the FET circuits and just put the switch in parallel with the output transistor of the optoisolator, making a wired-or.  You could do this with an N or P fet, whichever is cheaper.  The opto-coupler isn't really necessary because the FET can be the "translator" between the independent power sources.  Only the ground would be shared.  You have choices.

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Beginners / Re: uCurrent Gold Schematic

« Last post by uf29857 on Today at 07:39:33 pm »

As per the dave's video, placed for reverse current protection. Your are right will remove that one. And will plave tvs across J1

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Beginners / Re: LC filtering for combined Vref/VDD of ADC

« Last post by HwAoRrDk on Today at 07:39:07 pm »

I don't have any higher-voltage rails available from which to run a linear regulator. The noisy 3.3V is all I've got.

Is inductor saturation current ever going to come into play if I'm only drawing less than 1 mA? The 0805 I plan to use are rated for 15 mA.

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Other Equipment & Products / Re: How does the JBC (and clones) Soldering Station Sleep Mode Work?

« Last post by Astray on Today at 07:37:40 pm »

Someone posted this very useful information about the Aixun T420D in a post here that explains it very well.

""Standby" pin #4 and "extractor" pin #3 are internally pulled up (to 3.3V) different pins of microcontroller. When you insert a handle to cradle (connected to pin #4) or tip of cartridge to extractor (connected to pin #3) you push these pins to gnd, and can see a state "standby" or "extract" on station's display. T245 handle have a GND on metal ring, T115A have a GND both on metal tip and on metal shank near rubber cable gland."

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Repair / Re: Simpson 260 series 6 repair

« Last post by flashthunder on Today at 07:36:42 pm »

Hi wasedadoc....I have a current meter in series with a constant current source. I am fairly confident of the 50ua as I have a second Simpson 260 that I have used the same current source on and I am able to calibrate it with no issues.

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Other Equipment & Products / Re: Any opinions on the Aixun T420D?

« Last post by Astray on Today at 07:32:54 pm »

Yes, you can see additionally installed pin #4 in plug of T115A handle on my photos in post #115. One end of extra wire is soldered to this pin, other end - connected to the "tall stand" (pre-disabled from "stanby" yellow pair internally in holder).

Okay, so I think a finally understand. You have 2 wires coming out of the socket that connects to one of the ports of the back and one of those wires is going to the tall stand with arm for the T115 handle. I think a photo of the back of your main unit with all the wires would be very helpful to others in the future if they want to do the same mod. I will be doing it myself once I get the T115 handle in the mail.

"Stanby" pin #4 and "extractor" pin #3 are internally pulled up (to 3.3V) different pins of microcontroller. When you insert a handle to cradle (connected to pin #4) or tip of cartridge to extractor (connected to pin #3) you push these pins to gnd, and can see a state "stanby" or "extract" on station's display. T245 handle have a gnd on metal ring, T115A have a gnd both on metal tip and on metal shank near rubber cable gland.

No. "Stanby" pin #4, "extractor" pin #3 of channel #1, and "Stanby" pin #4 and "extractor" pin #3 of channel #2 are FOUR different pins of MC.

Oh, so if either the tip or the metal rings on the handle touch the stand then those pins will be grounded and tell the microcontroller to put the handles in sleep mode! This is very helpful.

Even if you connect those pins together with a resistor in the inside the unit it would cause both handles to be in sleep mode if either one of them was grounded so that would defeat the purpose.

Maybe this words are "chinese half-truth" and these kits  have the same hosts with same transfos (less powerful than T420/420d) that can work with both T115 and T210 handles but not at same time.

I'm a bit doubtful they are different hardware, but very possibly have different firmware/software that would prevent using a dual station. It's already too late anyways, I have my unit even though I select the wrong handle and now have a T210 handle and 3 tips that I did not need or want haha. The seller is sending me the correct T245 handle but not the tips because I made a mistake while ordering. This mistake ended up costing me $30 extra unfortunately :'(

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Security / Re: Microsoft repackages apps with a telemetry .NET wrapper

« Last post by radiolistener on Today at 07:32:11 pm »

Not sure what you mean.

I mean the case when

a well written opt-in makes it CLEAR to the user who is reading it what will and will not be collected and uploaded, and what happens to it once uploaded, so that the user can make an informed decision on whether to click “allow” or “decline”.

But when user click on "decline", it still sends telemetry, just encrypted it and use more rare connections to hide telemetry activity from user.

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Test Equipment / Re: Multimeter selection for production testing

« Last post by J-R on Today at 07:30:35 pm »

How about a 1 Ohm shunt with a 6.5 digit DMM?

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Projects, Designs, and Technical Stuff / what certification is required to sell electronic products?

« Last post by exe on Today at 07:26:47 pm »

Hi!

A friend of mine and I would like to make a portable gaming console. Question: what certificates we need to do that?

We are using esp32 module, the device is going to have a lipo battery. Our target markets are Europe and US, but we'd like to ship worldwide.

I see there some certificates come with esp32-s3-wroom-1: https://www.espressif.com/en/support/documents/certificates . Do we need to do anything extra?

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Test Equipment / Re: Choosing between entry-level 12-bit DSOs

« Last post by KungFuJosh on Today at 07:26:16 pm »

That's above my paygrade. 😉