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WIGGLING 'LITE' IN GUEST MODE

[IN STOCK] L-1 Power System.
MUFF WIGGLER Forum Index -> Music Tech DIY Goto page Previous  1, 2, 3, 4, 5, 6, 7, 8 [all]
Author [IN STOCK] L-1 Power System.
resynthesize
L-1 wrote:
resynthesize

Yes, that are thermofuses. There installed rated 2A. Try to use 2.5A ones.



thanks. ordered a couple of 2.5a thermofuses from mouser (PN: 652-MF-R250U) and installed them today. Been running for 5 hours with no issues yet, and the best part is my noise and pitch drift issues have disappeared!
L-1
resynthesize wrote:
L-1 wrote:
resynthesize

Yes, that are thermofuses. There installed rated 2A. Try to use 2.5A ones.



thanks. ordered a couple of 2.5a thermofuses from mouser (PN: 652-MF-R250U) and installed them today. Been running for 5 hours with no issues yet, and the best part is my noise and pitch drift issues have disappeared!


SlayerBadger! SlayerBadger! SlayerBadger!

Seems to these 2A ones tun off too early.
resynthesize
actually, i'm still having an issue very frustrating awhile after my last post, I noticed I was getting a subtle pitch modulation (kind of like vibrato) from my oscillators. after troubleshooting other things for awhile, I put a meter up to the power rails, and I'm reading +19v on the positive rail instead of +12v. -12v and +5v rails are reading normal. These readings are straight off of the busboard headers on the main power PCB.

What should I look at to troubleshoot?
L-1
You have out of regulation on positive rail.

At first check on shorts between regulator's legs. Clean solder joints from flux there.

If no luck, change regulator then.
resynthesize
L-1 wrote:
You have out of regulation on positive rail.

At first check on shorts between regulator's legs. Clean solder joints from flux there.

If no luck, change regulator then.


Thanks Alex.

I forgot to follow up, someone on the Synth DIY facebook group was able to pinpoint the problem after I asked for help and linked to the datasheet for the regulators:

"Page 6/16, section 4 shows what I mean. Here they are R1/R2, but they will likely have different designators on the L1 board.
If either of the pins on either of these resistors has a bad solder joint, the regulator will stop regulating, and pass the full 13.7V from the transformer. A quick RMS-peak conversion makes this 13.7(sqrt(2))=19.4V.
So double check the values are right (likely they are, or the calibration wouldn’t work), and give them a bit more solder love."

You were both right. The resistors in question are next to the thermofuse, which I swapped out for a 2.5a fuse instead earlier. I must have wicked away some solder from the resistor joint while removing the thermofuse. I touched up the joints and the supply has been rock solid for a week or so now Guinness ftw!
L-1
resynthesize

SlayerBadger! Congrats!
meta
Suppose I use the L-1 power supply without the L-1 busboards, but I still want 5V. Would it be OK to add a separate 5V power supply? Just connect its – terminal to the COM of the L-1?
L-1
meta

Two options there:


- simply is to install 5V regulator on positive rail, as I did on a busboard.


- better is to make a 5V PSU. Take AC from transformer winding which supplies negative rail. This method will not 'stole' power from positive rail which usually consumes more than negative rail.
meta
Thanks, L-1.

Would a completely separate 5V power supply work, too?
L-1
Hires photos of my last build:





elka
Hello everyone !

I finally get my PSU kit and I'm a happy man hyper

Nice work, like all the stuff of Aleksei applause

I still have 3 questions before building.

1/ for the resistors on the bus boards, is that correct :
R1 & R2 = 4k7
R3= 1K

2/ for the leds on the bus boards, is that correct :
- 5V = green
-12V = yellow
+12V = red

3/ I have 2 leds left (1 red and 1 yellow) for the main PCB, so which one goes top/bottom ?

Thanks for your help guys !
L-1
Yes, all is correct.

elka
L-1 wrote:
Yes, all is correct.




Thanks Alex !

You PSU is so nice that even the customs wanted to keep it hihi
L-1
elka

Did you pay customs tax or no?
elka
L-1 wrote:
elka

Did you pay customs tax or no?


Yes I did !

(I pm you for details…)
elka
Hi Alex !

For power connections, I followed that diagram you posted :



But on the pictures of the last builds you put just above, connections are reversed…
Which one is alright ?
Or both ?

Then, If we are to be just above or below 12V at trimming - let's say 12,04V or 11,96V which choice is better ?

Thanks for your help !
Best,
Lionel.
L-1
Both are correct.

There is possible to trimm exact 12.00 V very easy.
MARK27
I have two L-1 PSUs that I am trying to use to power an 18U case.

Reading other large case power supply threads on MuffWigglers, it seems to be universally important to have a common 0v among the individual power supplies in the power system.

With the L-1 PSU, how would I connect this common 0v? Or maybe I'm misunderstanding something and this isn't necessary in this case.

Thank you for any help.
L-1
MARK27 PSUs grounds are anyway connected through net power inlet.
undress
Built but untested (thanks L-1):

L-1
undress

Looks ok. The power inlet doesn't need so thick wires because the current there is lower due to higher voltage.
undress
I think they look thicker in the picture, but I had no trouble crimping them into the headers. I used them because they were leftovers from another project and I already had the insulated spade connectors at hand smile

BTW, I am building a plywood case, what type of screw do I need to attach the brass spacers, M3? [SOLVED]

Success:



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