Recent Posts

1

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

2

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.

3

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?

4

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.

5

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.

6

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..
 

7

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

8

Beginners / Re: Checking for noise in resistors

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

humidity spoils carbon resistors therefore drift

9

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

« Last post by xrunner on Today at 12:02:49 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.

10

Repair / Re: LED Strip lights flashing like a bad 90s rave

« Last post by RoGeorge on Today at 12:01:26 pm »

I would disconnect the LED strip and check the (group of) LEDs individually, one by one, with a DMM or with a voltage source + series resistor + 2 wires.  Could be that one of the many series LEDs is defective (interrupted) and when the voltage across it becomes too high, it short-circuit itself and lights up the rest of the strip, but at a higher voltage than it should, then the overcurrent protection turns all off, and the flicker repeats just as the defective LED would be the starter in a fluorescent tube lamp.

If not, then maybe check for dried out electrolytic capacitors in the power supply (though, they all look OK in the picture).