Soma - LYRA-8 DIY Kit

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Stoneyards
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Re: Soma - LYRA-8 DIY Kit

Post by Stoneyards » Tue Aug 18, 2020 12:40 pm

Very cool - thanks for sharing.
Evicshen wrote:
Tue Aug 18, 2020 12:24 am

It's just fluorescent orange spray paint though now I wish I had gone with glow-in-the-dark. The art combines an illustration I did with a logo my friend made for my music project, the text is mostly handwritten German translations of the original text. Using a laser cutter, I vector cut the holes and outline of the front panel first, covered the panel with clear tape, engraved the first image, spray painted it orange, covered it again in clear tape, engraved the text, spray painted it black, and then peeled off all the tape. Later I vectorized touch pad parts of the bitmap image using Inkscape, and cut the ovals out of nacre sheets, and applied them with wood glue.

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Re: Soma - LYRA-8 DIY Kit

Post by gnsk » Wed Aug 19, 2020 5:27 am

Lyra-8 irya!
lyra-irya.jpg
lyra-irya-iso.jpg
wood case, 274 x 274 x 55 mm, 1,6 Kg
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Re: Soma - LYRA-8 DIY Kit

Post by gnsk » Wed Aug 19, 2020 10:01 pm

i have some issue,
hyper LFO is bleeding to audio. I read about LFO LED in this thread, so removed that LED, but no difference.
With doubled, trippled LED resister, no effect.

if total FB is on(LFO mod off), it decreases slightly.
if delay mod LFO is off, it decreases slightly.

Any idea what might be causing these?
Thanks.

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Re: Soma - LYRA-8 DIY Kit

Post by Flounderguts » Wed Aug 19, 2020 10:08 pm

Did you remember to put the shields in?
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Re: Soma - LYRA-8 DIY Kit

Post by gnsk » Thu Aug 20, 2020 2:40 am

Flounderguts wrote:
Wed Aug 19, 2020 10:08 pm
Did you remember to put the shields in?
yes, two shields soldered.

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Re: Soma - LYRA-8 DIY Kit

Post by Flounderguts » Thu Aug 20, 2020 8:35 am

Check the electrolytics in the LFO...if one is backwards the LFO could be bleedy noisy.
Part of the issue with troubleshooting is lack of schematics
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Re: Soma - LYRA-8 DIY Kit

Post by rationale_music » Thu Aug 20, 2020 6:56 pm

gnsk wrote:
Wed Aug 19, 2020 10:01 pm
i have some issue,
hyper LFO is bleeding to audio. I read about LFO LED in this thread, so removed that LED, but no difference.
With doubled, trippled LED resister, no effect.

if total FB is on(LFO mod off), it decreases slightly.
if delay mod LFO is off, it decreases slightly.

Any idea what might be causing these?
Thanks.
Is this through headphones or the main output? The headphone circuit is pretty noisy on my Lyra 4 and easily picks up interference from the LFO, but the issue is inaudible on the main output.

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Re: Soma - LYRA-8 DIY Kit

Post by gnsk » Fri Aug 21, 2020 2:30 am

Flounderguts wrote:
Thu Aug 20, 2020 8:35 am
Check the electrolytics in the LFO...if one is backwards the LFO could be bleedy noisy.
Part of the issue with troubleshooting is lack of schematics
Thanks Flounderguts!
checked e/c near the 4093 IC, but nothing wrong.

If Total FB is down(LFO mod), the lfo click popping is more.
in mod delay section, mod source set to LFO, then more louder bleeding.
Of course, at Distortion, drive and mix to clockwise, more louder.

Total FB to LFO mod is at most effect to bleeding.

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Re: Soma - LYRA-8 DIY Kit

Post by gnsk » Fri Aug 21, 2020 2:35 am

rationale_music wrote:
Thu Aug 20, 2020 6:56 pm
Is this through headphones or the main output? The headphone circuit is pretty noisy on my Lyra 4 and easily picks up interference from the LFO, but the issue is inaudible on the main output.
Both, same bleeding via headphone, and main output.
I removed the headphone amp IC TDA2822, but same bleeding through main output.
So, i think not cause of headphone circuit. Of course the circuit is not so clean, in general.

Thanks!

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Re: Soma - LYRA-8 DIY Kit

Post by gnsk » Fri Aug 21, 2020 5:49 am

I found that;
when i turn down the total FB switch, the hyper LFO's rate or rhythm is changed, a little faster and to other pattern.
Is this normal behaviour or something wrong?
thanks in advance.

Added:
When total FB is off, the LFO LED is not entirely off, slight dimd.
When total FB is on, the LFO LED is on and off in total.
So, maybe this cause, the LFO looks as different pattern.

As experiment;
1. LFO mod to delay with total FB on,
2. LFO mod to delay with total FB off,
1 and 2 is same sound from delay. only LED looks like differently, cause of not entirely offed led.

the LED off problem happens only when the LFO is AND mode.

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Re: Soma - LYRA-8 DIY Kit

Post by Flounderguts » Fri Aug 21, 2020 11:44 am

backwards diode?
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Re: Soma - LYRA-8 DIY Kit

Post by gnsk » Fri Aug 21, 2020 6:51 pm

Flounderguts wrote:
Fri Aug 21, 2020 11:44 am
backwards diode?
i thought also about diodes.

all diode polarity checked. 10V zener, and 1N4148.
Also replaced one on control board to new 1N4148, but nothing different.

these investigation to lyra-8 gives also pleasant-8 to me.

Thanks!

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Re: Soma - LYRA-8 DIY Kit

Post by Flounderguts » Fri Aug 21, 2020 6:53 pm

When we (you) solve this, the fix is going to be named after you! I am looking forward to finding out the issue (even though I don't have it ATM)

I wonder if this might be part of the reason the factory builds are in steel boxes?
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Re: Soma - LYRA-8 DIY Kit

Post by gluepet » Sat Aug 22, 2020 7:14 pm

I believe that I have posted the below correspondence with SOMA here before - but it may be of help to those of you working on a solution. I have the same issue and have learned to live with it for the moment, as it does not appear unless levels are super high on 1/4" out. Unfortunately, I hard-soldered the delay IC's and have not taken the time to try out a replacement. I took it to my brother's house to troubleshoot with him and it did not happen when plugged in there - so I have no idea. Someone mentioned that different headphone impedances could affect it.

From SOMA:
Try disconnecting LFO led and see if the click goes away. The other noise (headphones) is likely from low quality PT2399s or other mistakes in delay section. There shouldn't be any noise when mix is at zero though. The other suspect would be ruptured ground signal, check the continuity from jacks to delay chips and op amps.

Me: I disconnected the LFO LED and it seemed to help that noise. Is there an alternate place to connect this in?

You can increase the value of current limiting resistor going from led to ground, start with double the value and work from there, you can find the balance between noise and led brightness experimentally, also throw a wire from that resistor's ground leg directly to the ground of the power supply jack.

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Re: Soma - LYRA-8 DIY Kit

Post by steviet » Sat Aug 22, 2020 11:43 pm

Finally getting into the build! So far so good. I'm documenting my progress, part one of a few to come!

Shameless self plug link to build diary part 1
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Re: Soma - LYRA-8 DIY Kit

Post by Flounderguts » Sun Aug 23, 2020 12:10 am

Nice Blog! Can I link it on my store? It's really clear and easy to read.

RoHS=Restriction of Hazardous Substances

I love your old-school resistors! Is that from the Mouser BOM? I have to admit, I've been using metal film resistors throughout, since that's what I have.

Totally jazzed for your build! And judging from your studio pix, we have similar taste in modules. I'm jealous of your DD build...I opted to do a VOIS Vocoder instead :goo:
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Re: Soma - LYRA-8 DIY Kit

Post by gnsk » Sun Aug 23, 2020 12:15 am

gluepet wrote:
Sat Aug 22, 2020 7:14 pm
I believe that I have posted the below correspondence with SOMA here before
yes, I read that post, and removed the LFO LED, but it was not alleviated.
* i removed the two PT2399 ICs, but same LFO popping, bleeding.
* at zero delay mix, also happens.
* to me, the mix level of distortion effects more.
* total FB off(LFO mod) effects at most.

BTW, other bleeding from osc exists. But it's very little.
Anyway, also I learn to live with these for the moment.

Thank a lot, gluepet!

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Re: Soma - LYRA-8 DIY Kit

Post by steviet » Sun Aug 23, 2020 1:18 am

Flounderguts wrote:
Sun Aug 23, 2020 12:10 am
Nice Blog! Can I link it on my store? It's really clear and easy to read.

RoHS=Restriction of Hazardous Substances

I love your old-school resistors! Is that from the Mouser BOM? I have to admit, I've been using metal film resistors throughout, since that's what I have.

Totally jazzed for your build! And judging from your studio pix, we have similar taste in modules. I'm jealous of your DD build...I opted to do a VOIS Vocoder instead :goo:
Just reading it would be enough to make me happy, but then you went and said nice things too! Thank you. And of course! I'd be happy to be linked, hopefully my silly little blogs can help someone else.

The resistors are from the BOM from SOMA! Aren't they cool looking? A little pricey for sure, but I wanted to build it using their cart and see what happens. Could have saved a bunch going to Tayda (which I will for the pots anyways) but these SOMA synths have me all concerned about the aesthetics of the inside of my synth. Vlad is a true artist!

Thank you again! I've got a few cool modules kicking around... Maybe a few too many :omg: but I'd like to see your setup. With these DIY adventures you've been taking I'm sure your studio is bonkers! Even if it's a lone expanded LYRA-8 :hail: and the Deckard's should be unreal. I've always wanted an expensive polysynth, and when I found out I could pay a bunch of money AND pour my life into a synth I almost threw up out of excitement. But I think you made the right call on the vocoder, God damn that thing is cool :goo:
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Re: Soma - LYRA-8 DIY Kit

Post by Bamboombaps » Wed Aug 26, 2020 7:20 am

I have a couple of these whoopsy panels which have been printed on the reverse of the board if anyone is interested.

If not as a panel then a drill guide I guess
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Re: Soma - LYRA-8 DIY Kit

Post by digix » Wed Aug 26, 2020 10:38 pm

Just to confirm - on the PCB are resistors marked 'om' which I assume to mean 'ohm'? Example on the IN-OUT board has a 100om resistor marked on the board which I take to mean 100-ohm. Cheers!

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Re: Soma - LYRA-8 DIY Kit

Post by Flounderguts » Thu Aug 27, 2020 12:52 am

digix wrote:
Wed Aug 26, 2020 10:38 pm
Just to confirm - on the PCB are resistors marked 'om' which I assume to mean 'ohm'? Example on the IN-OUT board has a 100om resistor marked on the board which I take to mean 100-ohm. Cheers!
Yes...the markings for the components aren't what we are used to. 100om is 100 Ohm. 100K is 100 k ohms. 3mom is 3 M ohms. On the caps 4.7m is 4.7uF (micro farads). 0.1 mMP is for a film cap, metallized poly. The 0.1 mf 160V CCCP is for a russian paper and oil tone capacitor, but any .1 uF over 100 V should be fine. And the footprint for the bipolar (or unipolar) electrolytic caps is the circle with no flat (2 clusters of 4 near the 4093 ICs)

Hope that helps!
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Re: Soma - LYRA-8 DIY Kit

Post by digix » Thu Aug 27, 2020 1:27 am

Perfect - thanks for confirming!

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Re: Soma - LYRA-8 DIY Kit

Post by hiegdk » Thu Aug 27, 2020 1:46 am

Does anyone know the size and spacing for the holes on the back of the unit (inputs, outputs, etc)?

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Re: Soma - LYRA-8 DIY Kit

Post by Flounderguts » Thu Aug 27, 2020 1:33 pm

It says in the build document. 30 mm on center for the jacks, and you can put the headphone jack wherever you want...it's wired to the IO board, as is power switch and power jack. You could also use 3.5 mm jacks and wire them to the IO, make sure they are switched jacks.
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Re: Soma - LYRA-8 DIY Kit

Post by Flounderguts » Fri Aug 28, 2020 9:50 am

If anyone is waiting for PCBs from Vlad, there is an unfinished Lyra in the FS section of Muffs...for less than pcbs + parts...
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