6. Batch "TA" 1S or 2S Bistro HD OTSM/NarsilM drivers 15-47.5mm size fit, S2+, C8, H03, MF01, MT03, Q8 Clicky or E-switch

I think I let speak pictures a bit, unfortunately only my phone camera I forgot there

bought a new shiney apartment, started to pack a lot stuff to move there fully till 31. Nov,
so thought I got enough time to get a few things done
Looks OK 2 minor things on to do list




maybe someone did a bad move when disconnecting washing or dish machine or so as I discovered water

getting worse

removing the dish machine to get below the kitchen part

You know woods color right?
finally below the dish machine I found black stuff that turned out be have been wood a long time ago

had to remove kitchen for further investigation

As I am not allowed as its house property not my apartment I had today first time a company here to replace the pipe
I finally got the permission to open the wall to get to the pipe before the workers come

Today also more bad news opened the wall next to the pipe and below the plaster was wood plate, looks now more like mold than wood
so bought heavy breathing protection mask for toxic stuff and started to open all up and removing the mold,
a company would charge me way too much likely and would handle it like asbest stuff

the only mobile picture I made today
with good camara I made a lot today but forgot it there

did i mention the new job I took on 1. Oct.?

Wow, that is bad. I think over here apartment renters can’t work on things, the building owners have to do all work. At least it does not cost the renter money to fix.

So do you have to pay for all the repair work?

Hard to say pipe fix is definitely house insurance
Water damage on walls maybe
Not sure if the last owners insurance will pay for the floor its obviously an old water damage which leaked over many years a bit and now got worse

The problem was made 1995 when the heating pipes were made new, some idiot drilled through the wall into the pipe and they put some glue stuff on the ceramic pipe instead installing a new segment

Oh god! We bought our more than 50 years old house two years ago and every time we touch something we found that the previous owners wanted to keep every cent they can on any job. I can feel your pain!

looks like my place. Good luck

All the best Lexel. One thing after another.

Hello, could lexel or someone help? I am building M2 Quad and my new 17mm FET driver from Lexel does not work.

I already checked,

leds are okay, no short (multimeter check, different driver)
resoldered wires on MCPCB
resoldered negative wire on driver
checked 7135 chips after I soldered spring, if there is no short (under hand magnifier)
pulled off driver, soldered to single MCPCB with led (led works), I connected a battery using crocodile clamps and wires to positive and ground

no response at all.

Then I checked driver again and found R1 connected to resistor?? besides and grounded. I have also another the same white version, which I haven´t use yet. I compared the resistors and they aren´t grounded. Does it matter and is this the problem?

R1 and R2 make a voltage divider
R1 1k connectoed to batt+
R1 and R2 on MCU pin 7 Off detection about 3V when battery full
R2 3.3k grounded

It happened some time MCU voltage got grounden by accident, then R5 4.7Ohm burns like a fuse

Thanks Lexel, should I resolder or change some component in this case? I want to make this driver working.

first would be measuring if on MCU pin7 are 3V, if not the voltage divider is not OK

checking if the MCU gets power between the diode and C2

as the MCU pins are bent 90° the contact area to the pad is very small might be solder problem there

I got no reading :(, this has to be faulty. May I ask you, could you send me a new one 17mm Bistro HD OTSM (Tail clicky lights) driver together with my Buck driver order?

on the black one the common point on the resistors is very close to copper ring, if there is a short you get 0V reading or if R2 is shorted

the white version is improved in tiny details

Yes, R2 was grounded to the ring. So I removed it, wicked off all the solder and found, that the pad of R2 is conected to the ring. There is no way how solve this I guess, look below

It looks like there is still a layer of solder. Are you using solder wick?

If you can get to the clean pad material you can try taking an exacto knife or similar and break the connection.


those are possible short areas

also under R2 a short may happen but less likely

Its no problem to make a replacement for a fee that covers shipping parts and the time to make it,
usually cheaper than failure analysis but I try never to scrap a driver that has an error
I test all drivers here befre shipping so I have some that need fix and often points on little design errors (or fab errors because they are not within 6 mil with a layer)

on latest Gen I used 8 or 10 mil safety distance

Okay Lexel, I will check once more the spots you showed as potencial issue, thanks :wink:

Lost a switch pad on my skilhunt driver. Anyone know another option?

You can use one of lexels switch boards from oshpark as a replacement.

Is there another option to connect the switch?