NOYITO X9C103S Digital Potentiometer Module Board 10K DC 3V 5V with ESD Protection (Pack of 2)

There are header thru-holes on each end of the board. Five pins on one end, three pins on the other. Each ends alignment are OK on 0.1" centers, so headers go in OK. But the two ends are not on a 0.1" grid from each other. This makes it impossible to get headers installed straight if you want it to plug into a breadboard. I did try several alignments back and forth to make it work, but then measured it. The two rows end-to-end are ~0.55" apart. it should be either 0.5" or 0.6". You can make it work, but the pins are not straight up no matter how you do it.

As other reviewers noted, the two rows of pins are not on a breadboard-compatible grid. I would forgive that if it otherwise worked perfectly, but the device seems to have 33 taps (where the X9C104S should have 99) and tops out at 70K ohms (where the X9C104S should have 100K). Either of those defects by themselves would have allowed me to use it for my project, but in combination, there isn't enough precision for this to work.

Bad news. Two of the four units were defective. One was actually missing parts. Good news, replacement parts showed up today. Bad news, BOTH OF THE REPLACEMENT DIGITAL POTS HAD OPEN 10K RESISTORS! Bottom line, good supplier, lousy product where 4 of 6 PCBs did not work.The supplier has offered a full refund on my order.

I got 2 (1 purchase) of these for use with an arduino. I soldered headers and connected both to my arduino with my VOM measuring resistance across the VH and VW pins. One worked perfectly, but one showed 1K and nothing I could do would change it. I switched between the good one and the bad one and the problem stayed with the bad one. So I did a return and got 2 more. I soldered headers on them and both of them locked at the 1K value. I'm not a great solderer, but the connections look OK to me - no cold solder - no solder bridges. I can find no help with diagnosis, so I'm presuming it's a manufacturing issue. Pending root cause, I can not recommend these.

The caps on this board will attenuate AC output as frequency increases

Both the units I received have open circuits measured directly at the IC pins. I did get them delivered quickly, though. I'm guessing some entrepreneur snagged a bad lot out of the trash and now we're getting them.

100 steps per 100kOhm (104 version) makes this less useful. The current Arduino library for this sort of works. There are better choices... 256 step chips, 1024 step chips, etc.