uT_u 8HP micro Temps Utile build

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GSE
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uT_u 8HP micro Temps Utile build

Post by GSE » Fri Mar 23, 2018 11:39 am

I didn't see any threads related specifically to the 8HP uT_u build, there are some gotchas that may help your builds go smoother.

You may encounter pictures that show the bridge rectifier oriented incorrectly. The silkscreen is correct, and should be installed thus...
Image

U12 is oriented different than the other TL072s. It's shown correctly on the silkscreen, but easy to miss. Also note: the Teensy is mounted in a different orientation than the uO_C.
Image

If you want to use the DAC functions of the Teensy, you will need an additional pin that the uO_C did not use. Again, easy to miss.
Image

Hope this helps others not fall into some avoidable traps.

beedogs
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Post by beedogs » Wed Apr 18, 2018 11:45 am

what switches did you use? there's no part number specified in the BoM so it's kind of tough to figure out what'll work.

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Post by mutronic » Wed Apr 18, 2018 1:14 pm

beedogs wrote:what switches did you use? there's no part number specified in the BoM so it's kind of tough to figure out what'll work.
these are the switches you want

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Post by beedogs » Wed Apr 18, 2018 10:55 pm

cheers mate, this helped a lot. they're out of the 250 gram switches right now on mouser so i got the 160s instead but it was the form factor that was most important.

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Post by toneburst » Thu Nov 08, 2018 5:26 pm

I can't seem to source 4.2k 0805 resistors for part R54.
Anyone know if 4.22k will be OK instead?

a|x

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Post by vespine » Sun Nov 11, 2018 2:25 am

Chalk me up as someone this post helped!

I thought I would also share something that might also help someone, the screenprint is so small and in some areas obscured and a little hard to read I made this picture to print out and have next to me while soldering it made locating component placement easier.

Image

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Post by the_conman » Fri Nov 30, 2018 10:04 pm

Hi
Iv'e finished my build and I am having trouble getting it to work.
all the inputs work fine but the 6 outputs are not. When hooking it up to my scope I see the the triggers are only at 0.2 Volts. I have no idea whats going on. I think it could be the Op-amps.

Edit:
Fixed it
soldered the wrong size resisters :doh:
Last edited by the_conman on Mon Dec 03, 2018 3:27 am, edited 2 times in total.

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Post by degeneratedsines » Sat Dec 01, 2018 8:17 am

Is it intended that the .dip and .sch files are not into the github repo https://github.com/jakplugg/T_u ? the µO_c repo has them.
It is always a bit tedious when you look for components location in the rendered pdf.

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Post by toneburst » Fri Dec 14, 2018 7:15 pm

Thanks for the tips!
Mine now up-and-running (all worked first time, which is rare, for one of my builds ;) ).

Image

Image

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Post by sempervirent » Fri Dec 14, 2018 9:45 pm

Looking good @toneburst – thanks for getting a panel.

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Post by aragorn23 » Sat Dec 15, 2018 9:09 am

Hey all. I see the DAC isn't listed on the BOM for the uTemps. I can see on the board it's some sort of three pin through hole thing. Any suggestions of what to get? I've almost finished my build - just need the DAC.

[EDIT] Ignore me - I've just realised the 'DAC' is a jumper between two of the pins...

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Post by Kevimu » Wed Jan 02, 2019 9:18 am

toneburst wrote:I can't seem to source 4.2k 0805 resistors for part R54.
Anyone know if 4.22k will be OK instead?

a|x

Did you use the 4.22k in the end? Did it work fine?

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Post by Altitude909 » Wed Jan 02, 2019 9:40 am

Dont forget to wire the RESET pad on the teensy with the pogo pin (or wire lead if youre adventurous) the power up protection wont work without it

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Post by flts » Wed Jan 02, 2019 9:51 am

Kevimu wrote:Did you use the 4.22k in the end? Did it work fine?
I don't have the schematic, but a standard 4.2k 1% tolerance resistor can have actual resistance from roughly 4.16k to 4.24k. Using a 4.22k (at +-1% tolerance roughly 4.18 to 4.26k) in its place should be perfectly fine.

If the spot in the schematic seems to require a very exact precision resistor (I doubt it, in that case it would probably be specified a 0.1% resistor) or one is OCD-inclined, it's always possible to measure that the actual resistance falls within that particular treshold.

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Post by Kevimu » Wed Jan 02, 2019 10:22 am

flts wrote: a standard 4.2k 1% tolerance resistor can have actual resistance from roughly 4.16k to 4.24k. Using a 4.22k (at +-1% tolerance roughly 4.18 to 4.26k) in its place should be perfectly fine.
I went along the same line of reasoning and used it. Thanks for the advice friend

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Post by undress » Tue Jan 22, 2019 8:38 pm

Altitude909 wrote:Dont forget to wire the RESET pad on the teensy with the pogo pin (or wire lead if youre adventurous) the power up protection wont work without it
I have a µT_U which does not have the reset pad labeled, so I do not know where or how to place the pin. Help?

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Post by Altitude909 » Tue Jan 22, 2019 9:16 pm

undress wrote:
Altitude909 wrote:Dont forget to wire the RESET pad on the teensy with the pogo pin (or wire lead if youre adventurous) the power up protection wont work without it
I have a µT_U which does not have the reset pad labeled, so I do not know where or how to place the pin. Help?
If your board doesnt say 1.2 on it, then you wont have it. Its not something you can hack on

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Post by undress » Tue Jan 22, 2019 11:31 pm

Altitude909 wrote:
undress wrote:
Altitude909 wrote:Dont forget to wire the RESET pad on the teensy with the pogo pin (or wire lead if youre adventurous) the power up protection wont work without it
I have a µT_U which does not have the reset pad labeled, so I do not know where or how to place the pin. Help?
If your board doesnt say 1.2 on it, then you wont have it. Its not something you can hack on
I don't think it has a version number on it, or the actual word "reset" printed on it, but the space for it is there (?) in between the legs of the tactile switch:

Image

I still don't know how to place it. Solder onto the board so that the tip touches the "rst" on the teensy?

[Sorry for the sad noob level, this is only my second diy project (which also makes it my second module overall)]

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Altitude909
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Post by Altitude909 » Wed Jan 23, 2019 12:13 pm

No, that's a via. If you had it it would be on the right side. That's the old board.

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Post by undress » Thu Jan 24, 2019 2:26 am

Altitude909 wrote:No, that's a via. If you had it it would be on the right side. That's the old board.
Alrite, thanks. Should've checked the Jakplugg Git...

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Post by Lemmy » Tue Sep 03, 2019 4:35 am

Anyone in UK have a spare pogo pin I could reimburse you for?

Actually perhaps I don't need it - I am using a Doepfer LC9 case with the old power supply, anyone else used this without the pogo pin and had any problems?

EDIT: I'm in the wrong thread, I'm building a uO_C, but the same question stands.

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Post by Altitude909 » Tue Sep 03, 2019 9:12 am

Lemmy wrote:Anyone in UK have a spare pogo pin I could reimburse you for?

Actually perhaps I don't need it - I am using a Doepfer LC9 case with the old power supply, anyone else used this without the pogo pin and had any problems?

EDIT: I'm in the wrong thread, I'm building a uO_C, but the same question stands.
if it works, it works. No pogo needed.

If you want to get all mad scientist, you can solder a lead clipping to the reset in and solder that into the hole in the board

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Post by Lemmy » Wed Sep 04, 2019 4:58 am

Yeah... one less thing to include in troubleshooting though. I'll build it and see what happens.

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Post by baszor » Thu Nov 07, 2019 8:26 am

I saw two different TL072's are used in temps utile dip file, 3 TL072BID and one TL072ACD. Is the ACD variant important or can I place 4 BID's?

Image

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Post by Altitude909 » Thu Nov 07, 2019 8:34 am

^
No difference.

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