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Registered Member #30656
Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
Justin wrote ...
So I found out the hard way that if the UVLO pot (R29) is turned too far in the wrong direction(like say if you soldered it in that way) it feeds up to 16.4V into the LM8365 and kills it.
I'd suggest a 13k (E24) or better yet, a 13.3k (E48) resistor in series with the pot in the next revision to eliminate this issue - with 24Vin this should keep the ULVO input just below the absolute max of 6.5V even with the pot at 0 ohms.
Registered Member #3704
Joined: Sun Feb 20 2011, 01:13PM
Location: Vermont, U.S.A.
Posts: 92
Hi loneoceans, I have just a couple of comments (corrections) to your schematic:
1) Your 7809 regulator does not seem to be annotated properly in the Rev C schematic? It's labeled "ICx" (
2) The output from your UVLO chip is correct (it's labeled "To IC6A Pin 1 (CLR) via Jumper") but the corresponding comment on IC6A says "To OCD (IC11) Pin 1". This should read "To UVLO (IC11) Pin 1".
Hi loneoceans, I have just a couple of comments (corrections) to your schematic:
1) Your 7809 regulator does not seem to be annotated properly in the Rev C schematic? It's labeled "ICx" (
2) The output from your UVLO chip is correct (it's labeled "To IC6A Pin 1 (CLR) via Jumper") but the corresponding comment on IC6A says "To OCD (IC11) Pin 1". This should read "To UVLO (IC11) Pin 1".
Regards, Matt
Thanks everyone for helping to point out the errors in the documentation and for the suggestions! Will be updating the pages etc. For the trimmer resistor, thanks for pointing that out! Typically though this isn't a problem since the trimmer pot comes set at its default value directly from the manufacturer in a good range for soldering directly and adjusting, but definitely something to take note of!
As a side note, for those interested, I have a bunch of UD2.7C PCBs in stock for $10/board or $25 for 3. See here:
Finally, I also just assembled a new bunch of my MIDI 2 controllers due to very popular demand: available if anyone is interested.
Registered Member #61642
Joined: Fri Jun 09 2017, 06:59AM
Location:
Posts: 4
Hi,
Does anyone have a updated version of the mouser project ( as some things are not available anymore and some aren't available before 2018. However I'm not very experienced yet and I don't want to replace the parts with incompatible ones which may cause problems with the driver.
Regards, Nestade
EDIT: Just replaced the missing compounds - will it work with this parts?
Registered Member #61642
Joined: Fri Jun 09 2017, 06:59AM
Location:
Posts: 4
nzoomed wrote ...
I think somewhere i posted a revised order list as there were a few things I found missing at the time that I build my coil also.
Ill try and find it.
Hi,
Okay - thanks :) Do you think my changes will work? (I listed the things I changed as this parts weren't available at the moment - would be nice if you could have a look if you have time as I'm a noob yet)
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Universal Driver 2.7 Rev C
 "Link2")
