Recent Posts

1

Mechanical & Automation Engineering / Re: Repurposing PVC Pipe for DIY Projects

« Last post by xrunner on Today at 12:30:41 pm »

The builder is using CA glue. What's wrong with what he chose, seems to know what he's doing. You can use SCIGrip 16 if you don't want to use that.

CA glue is a bad choice for pvc

Why do you think that builder is using it? Just curious your thoughts on it. He (or she) doesn't seem like a person to make a mistake like that. 

2

Test Equipment / Cheap oscilloscope for checking mains power quality? Also logging equipment.

« Last post by mrsparkle on Today at 12:29:44 pm »

Hello,
I am a residential electrician that occasionally has to troubleshoot issues such as LED flicker, GFI nuisance trips, and well that's about it. I am looking for a very basic oscilloscope or similar device that I can connect to the lines and check for noise / power quality issues. Mostly just to verify that X is the culprit, whether X is an ev charger or dirty power from the transformer.

As such, I do not want to spend a lot, and I have a fairly limited usage, only to be able to check for a malformed voltage or current waveform at 120/240V. What's a good selection for me? How cheap can I go, and what are the minimal specs I should look for?

Also, at times I may need to respond to an intermittent issue and attach a data logger inside a panel for a day or two that can pick up on rapid spikes or sags. Again, I would use this tool rarely and don't want to spend a lot. I know there are higher end loggers like Flukes, over $1k, which is more for industrial use, but its not nearly so critical to my job. Again, what would be minimum specs and price point for that?

Thanks

3

Mechanical & Automation Engineering / Re: Repurposing PVC Pipe for DIY Projects

« Last post by langwadt on Today at 12:23:03 pm »

The builder is using CA glue. What's wrong with what he chose, seems to know what he's doing. You can use SCIGrip 16 if you don't want to use that.

CA glue is a bad choice for pvc

4

Beginners / Re: Blocking Phantom Power 48V from Audio output

« Last post by Terry Bites on Today at 12:22:26 pm »

Have a good read.
See page 11.

5

Beginners / Re: Comparator circuit seems to be oscillating (well, pulsing, really). Solutions?

« Last post by Terry Bites on Today at 12:19:50 pm »

How about an actual schematic instead of vague blurb?

6

Beginners / Re: Quickly Triggering Sensors - need an oscilloscope? what specs? (AU)

« Last post by Terry Bites on Today at 12:17:04 pm »

A cheap as chips solution:
Use an arduino to generate the pulse pattern www.arduino.cc/reference/en/libraries/pulsepattern   github.com/RobTillaart/PulsePattern

A picture is worth a thousand words.
Here's my interpretation of your description.

7

Repair / Fluke 1503 Insulation Tester replacement Transformer T1

« Last post by klim on Today at 12:15:01 pm »

Hi, I want to bring back by Fluke 1503 to life. The original Transformer had a shortage in winding, so i desoldered it from pcb. Now I'm looking for a replacement Transformer.
Too bad there are no technical details availible. The PCB device id is: T1. Below some pictures. I hope to get some help, many thanks in advance.

8

Projects, Designs, and Technical Stuff / Re: (Yet Another) DIY Multislope ADC

« Last post by iMo on Today at 12:11:46 pm »

Updated to a perhaps the final version, where I returned to the traditional formula, which works properly only when the rundown charges are related to the "PWM charge" (56 in our case above).

The rundown range is +/- (0..27) counters diff counts (that is 56 SM clocks, also mind there are the RDN and RDNP inputs now as per the PIO source). The rundown now returns "reasonable" values, imho, which fit the both resolutions "smoothly".

For example the above runup resolution is 9800uV and the rundown resolution 175uV in 56 steps.

Still the question is how to handle the +/-1 noise in the rundown results and the incorporation of the noisy auxADC results..
 

9

Power/Renewable Energy/EV's / Re: Dual Complementary Rectifier PSU

« Last post by virusx2 on Today at 12:11:25 pm »

Ok, if someone could analyze this with some equations i would be glad

10

Beginners / Re: Checking for noise in resistors

« Last post by strawberry on Today at 12:10:17 pm »

humidity spoils carbon resistors therefore drift