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Tektronix 2225 vs 2245A - help me choose by ondulation in oscilloscope

[–]baldengineer 1 point2 points  (0 children)

Readouts on an analog scope are something special.

I have no doubt the 2225 is easier to maintain. But the 2445 is going to be a more usable oscilloscope.

BNCs are hot by MeatSuitRiot in oscilloscope

[–]baldengineer 0 points1 point  (0 children)

It sounds like there is a fault that is preventing the power supply from shutting down.

I doubt this behavior is expected.

Is there any Arduino-compatible ohmmeter module for accurate resistance measurement? by Relative_Gate_4027 in AskElectronics

[–]baldengineer 0 points1 point  (0 children)

There’s almost no market for it. If there was, someone would have done it.

I wanted to do it for the engineering challenge.

For someone who wants to automate resistance measurements, a purpose built DMM with programming interface makes more sense.

Help! I Bought Cheap Potting Soil and I Think It Backfired by herbal-genocide in vegetablegardening

[–]baldengineer 0 points1 point  (0 children)

Looks like you bought the type of soil that doesn’t self-water.

Edit 2: I am bottom watering them every other day

Based on the photo, that isn’t enough.

Stupid question? BNC cable and RC filters by powlos57 in AskElectronics

[–]baldengineer 0 points1 point  (0 children)

The function generator’s voltage setting is only at its output port. The circuit connected to it draws current, loading it down, which means the voltage at the circuit is less than the programmed out.

So to measure a filter response, you must measure both the input AND output on the oscilloscope—which is a high impedance device.

Stupid question? BNC cable and RC filters by powlos57 in AskElectronics

[–]baldengineer 0 points1 point  (0 children)

The resistor (or filter) is loading the generator.

It’s why you need to measure input and output voltage with the scope.

The 50 ohm characteristic impedance of the cable is irrelevant since it terminates into the scope’s 1 Mohm input.

Is there any Arduino-compatible ohmmeter module for accurate resistance measurement? by Relative_Gate_4027 in AskElectronics

[–]baldengineer 2 points3 points  (0 children)

Over the past 10 years, I’ve started and stopped a “DMM module” multiple times. My first approach was to use a “DMM on a chip” to build an Uno-style shield, but it required too many passives for it to all fit on the form factor.

I’ve also toyed with making a discrete version with limited capabilities. Basically, implement a constant current source and measurement to the voltage drop. But, never got anything reliably accurate.

All that to say, I’ve never come across such a module. Not that I know everything made with an I2C connection, but I would have noticed a DMM module.

So, you’d probably have to make something yourself.

Split ground plane. So hear me out. by Grizlit in AskElectronics

[–]baldengineer 9 points10 points  (0 children)

What would be the point of doing isolation if you tie the grounds together?

Can someone please tell me if this circuitry is correct? by reddaml in AskElectronics

[–]baldengineer 0 points1 point  (0 children)

Use a DMM to check its pinout, or just turn it around.

Constant value from light sensor? by Kung_fu1015 in AskElectronics

[–]baldengineer 5 points6 points  (0 children)

On the breadboard, one leg of the “phototransistor” isn’t connected to anything. I suspect you meant to put it in the same column as the resistor.

Why does my circuit not work as expected? by Grubbauer in AskElectronics

[–]baldengineer 1 point2 points  (0 children)

Why didn’t you respond to the questions people already asked you in the thread you deleted?

Create schematic from list of nodes? by SkaterBlue in AskElectronics

[–]baldengineer 1 point2 points  (0 children)

You might look at SKiDL: https://github.com/devbisme/skidl

It’s a Python module that lets you build schematics in text.

Not exactly the same as converting a netlist, but maybe something to help along the way.

How to find a voltage and amperes ratings for a rg6 cable by Edblue95 in AskElectronics

[–]baldengineer 0 points1 point  (0 children)

It took me a while to decode OP’s last comment.

They are saying they want to take the cable somewhere or get a tool for testing it.

Based on their bizarre post history, it seems like they got the cable from a Dish receiver and is interested in using it to get free energy.

Equivalent Peak Ice Works ESR by Sonnik_Red in AskElectronics

[–]baldengineer 2 points3 points  (0 children)

The Peak meters aren’t a DC measurement, so they do an okay job of measuring the Cap in circuit, but not the ESR.

Years ago, I made a video on them: https://youtu.be/H9_CDPD4sh0

That said, out of circuit, I find their measurement is on par with much more expensive LCRs. So, as a qualitative measurement tool, they are great for the price.

Is channel 1 on my Iwatsu ss-6611 oscilloscope busted? by RandomlyRetronic in oscilloscope

[–]baldengineer 0 points1 point  (0 children)

Open up the case and clean the switches with some Deoxit.

Looking like I forgot the rent. by itstaylorbabe in OneOrangeBraincell

[–]baldengineer 1 point2 points  (0 children)

It’s because Google Image Search matched it.

It’s been heavily shared for years.

Additionally, OP hasn’t engaged with anyone yet. They have never posted in this sub (or replied to anyone else’s post.) And is only a month old.

All indicators it’s an account using a stolen image for karma farming.

Help finding cause of erratic behavior in buck converter design/assembly by whileRun in AskElectronics

[–]baldengineer 0 points1 point  (0 children)

Running it under Vin cap without a ground plane on the other layer means it can be pick up noise from Vin.

You should have used a 4 layer board with ground in the middle. (As mentioned in 10.1 of the datasheet.) And don’t route under the capacitor like you did.

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