ANALOGUE WAVEFORM GENERATOR MODEL 25S

Discussing some incredible modules that don't quite fit into the other forum categories.

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livefreela
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Post by livefreela » Tue Jul 11, 2017 10:08 pm

ls3958 can be had direct from linear systems - I just call them on the phone (the number's on their website), they're super helpfuli and always get my order to me in a few days tops. i picked up a few along with a couple of ls312 & ls351 (the matched pairs called for in the 259r bom - mat02/03 are a fortune) for my 259 and I'm really happy with how mine turned out.

Are you guys socketing these jfets? Like I said I'm stoked on how mine is sounding, but I may have gotten lucky - wondering for future builds...

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APETECHNOLOGY
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Post by APETECHNOLOGY » Tue Jul 11, 2017 11:15 pm

memes_33 wrote:
APETECHNOLOGY wrote:hello memes_33,

they have ls3958 here for $5

https://www.trendsetter.com/Transistor- ... 1%206l.htm
awesome, thanks. that's an easier pill to swallow for sure. ebay has a bunch of cheap options but i have no experience distinguishing fakes from real deals.
i have been burned to many times with fakes,i am done with buying on eBay.
if possible buy something you are sure on,
buying transistors and such is easier on aliexpress,
i have never had to send them back.
with eBay you have to send them back, Polida wants me to pay to ship there garbage back to them so they can sell them again. just lame.
i think the time for "deals" is coming to a end!
:sadbanana:

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livefreela
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Post by livefreela » Wed Jul 12, 2017 12:07 am

Checked my invoice - ls3958 direct from ls were 5.60usd a piece, not much savings to be had on eBay...

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APETECHNOLOGY
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Post by APETECHNOLOGY » Wed Jul 12, 2017 12:45 am

livefreela wrote:Checked my invoice - ls3958 direct from ls were 5.60usd a piece, not much savings to be had on eBay...
sorry to derail a bit,
but what was the shipping?

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livefreela
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Post by livefreela » Wed Jul 12, 2017 6:57 am

7 bucks for usps priority mail
APETECHNOLOGY wrote:
livefreela wrote:Checked my invoice - ls3958 direct from ls were 5.60usd a piece, not much savings to be had on eBay...
sorry to derail a bit,
but what was the shipping?

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REcDeso12oi
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Post by REcDeso12oi » Mon Jul 24, 2017 9:06 am

I bought 3 ls3958's from Trendsetter and sat down a couple days ago and did a little low tech shootout with my 25s. 2 of the ls3958's sounded pretty much identical to the one I received w/ the unit and one of them sounded significantly different when adjusting the timbre controls. As to whether it sounded better or worse is entirely subjective so I won't turn this into a conversation that I'm sure has been beaten to death on this forum. BUT I will say if your unhappy w/ the way your 25S's timbre controls shape the sound its worth the $$ in my mind to roll the dice and see if you can get something you like more out of it.

I'd love to do a Oscilloscope shootout, does anyone know if they make sockets that would work for ls3958's?

CHEERS!

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auxren
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Post by auxren » Mon Jul 24, 2017 10:17 am

Does anyone's symmetry control do much of anything? I don't notice an effect from mine unless I CV it with an audio rate modulator.

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REcDeso12oi
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Post by REcDeso12oi » Mon Jul 24, 2017 11:11 am

I'll see if i can post some audio files later of my symmetry functionality, but Todd's A/B (Audio File) earlier in the thread between his 25S and a 259r is a pretty great starting point to checking to see if your primary osc is functioning properly. I also feel like the symmetry knob's effect isnt very noticeable without the timbre knob being up a bit. I mimicked what he did in the video to see how similar mine sounded.

Hope that helps.

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auxren
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Post by auxren » Mon Jul 24, 2017 1:14 pm

REcDeso12oi wrote:I bought 3 ls3958's from Trendsetter and sat down a couple days ago and did a little low tech shootout with my 25s. 2 of the ls3958's sounded pretty much identical to the one I received w/ the unit and one of them sounded significantly different when adjusting the timbre controls. As to whether it sounded better or worse is entirely subjective so I won't turn this into a conversation that I'm sure has been beaten to death on this forum. BUT I will say if your unhappy w/ the way your 25S's timbre controls shape the sound its worth the $$ in my mind to roll the dice and see if you can get something you like more out of it.

I'd love to do a Oscilloscope shootout, does anyone know if they make sockets that would work for ls3958's?

CHEERS!
I think this socket should work: http://www.digikey.com/scripts/DkSearch ... 7666669534

After looking at the schematic, I think I am going to replace my 2n3958 with a socket and just try out a bunch of J201 JFETs until I get a good combo that works.

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APETECHNOLOGY
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Post by APETECHNOLOGY » Mon Jul 31, 2017 2:11 am

i went to a friends house with my scope,
i looked at his 261e symmetry
beautiful sounding. complex...
my 2 x25s symmetries do nothing comparable ,
something is not right with this build
:cry:

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Leoespejo
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Post by Leoespejo » Mon Jul 31, 2017 4:54 am

APETECHNOLOGY wrote:i went to a friends house with my scope,
i looked at his 261e symmetry
beautiful sounding. complex...
my 2 x25s symmetries do nothing comparable ,
something is not right with this build
:cry:
Though 261e is based in 259 they are completely different oscillators. I think 25S is based in 259 not in 261e.

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mritenburg
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Post by mritenburg » Mon Jul 31, 2017 8:59 am

APETECHNOLOGY wrote:i went to a friends house with my scope,
i looked at his 261e symmetry
beautiful sounding. complex...
my 2 x25s symmetries do nothing comparable ,
something is not right with this build
:cry:
Have you compared them to the Sputnik Dual Osc? (Euro module). Based on all of the discussion here, it sounds like the 25s is very similar to the Sputnik Dual Osc.

Quick and dirty video of timbre->order->symmetry. Left side is Sputnik Dual Osc, right side is 259r. If your 25s functions anything like this, it should be ok.

[video][/video]
Disappointment with any module is usually a failure of imagination.

Post-Synthwave Track


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APETECHNOLOGY
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Post by APETECHNOLOGY » Thu Aug 03, 2017 1:48 pm

so i measured 20 x ls3958 for idss,
they ranged from 1.8 ma to 4.3 ma.
i had a 25s that had a weak timbre, removed the ls3958 and measured the ldss measurement= 3.6ma
i inserted the ls3958 with the ldss of 4.3ma
the included scope picture is of all 3 timbre pots fully clockwise
Image

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REcDeso12oi
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Post by REcDeso12oi » Sun Aug 13, 2017 1:27 pm

APETECHNOLOGY wrote:so i measured 20 x ls3958 for idss,
they ranged from 1.8 ma to 4.3 ma.
i had a 25s that had a weak timbre, removed the ls3958 and measured the ldss measurement= 3.6ma
i inserted the ls3958 with the ldss of 4.3ma
the included scope picture is of all 3 timbre pots fully clockwise
APETECHNOLOGY, sorry if this is a stupid question, but did you find the higher idss value changed the response of the timbre section?

also is there a thread or a good website that you know of that explains how to test the idss? I searched the muffs but couldn't find anything.

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APETECHNOLOGY
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Post by APETECHNOLOGY » Sun Aug 13, 2017 1:41 pm

REcDeso12oi,
hello, yes selecting the ls3958 changes the response of the timbre.
symmetry does not change much without the high order being adjusted clockwise. i think this is by design?in the "secret buchla zone" there is talk of substituting CA3160 in place of CA3130. the ca3160 was used in the original 259 designs. the ca3160 has frequency compensation. i am going to try this when i am not so busy.
as for idss testing, it can be done with a simple meter.
the ls3958 is a "n" type fet.
a simple 9 volt battery in place of the marked 12volt is fine.
hope this helps!



Image

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REcDeso12oi
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Post by REcDeso12oi » Sun Aug 13, 2017 1:50 pm

APETECHNOLOGY wrote:REcDeso12oi,
hello, yes selecting the ls3958 changes the response of the timbre.
symmetry does not change much without the high order being adjusted clockwise. i think this is by design?in the "secret buchla zone" there is talk of substituting CA3160 in place of CA3130. the ca3160 was used in the original 259 designs. the ca3160 has frequency compensation. i am going to try this when i am not so busy.
as for idss testing, it can be done with a simple meter.
the ls3958 is a "n" type fet.
a simple 9 volt battery in place of the marked 12volt is fine.
hope this helps!



Image

Awesome! Thanks for the info

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Pailo
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Post by Pailo » Fri Sep 15, 2017 10:47 pm

Did anyone know a trick to grounding the jacks
I am mounting and there is only one place for the wire
for the tini jax? I always thought there were two spots?

Anyone want to shed light before i mount?

thanks
joseph

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APETECHNOLOGY
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Post by APETECHNOLOGY » Sat Sep 16, 2017 12:35 am

Pailo wrote:Did anyone know a trick to grounding the jacks
I am mounting and there is only one place for the wire
for the tini jax? I always thought there were two spots?

Anyone want to shed light before i mount?

thanks
joseph
hello,
the aluminum panel is the common ground for the audio.
it seemed strange to me, it works!

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Pailo
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Post by Pailo » Mon Oct 02, 2017 12:45 pm

finished a pair. they sound excellent.
i have a 261e that sounds a bit lower in
sound and grumbles, but i love the 25s for sure.
It sounds different than the 259r too, but
from what i have been hearing here, they arent too
far apart.

Maybe i got lucky but they seem like a bit more clean version
of the 259r. I seem to like them more than the 261e too, but
the 261e is more rubbery and unique in that sense.

The fold sections do not seem to move as far as the 259r,
but again i still think they are totally musical.

Took me about 12 hours to build each one.
I did the mods too from EMS, and came out great.

Calibration was about 20 minutes and they track great for me too.
If anyone needs any help with what the cal, pm me.

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jheronymo
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Post by jheronymo » Sat Oct 14, 2017 1:58 pm

Hey everyone,

There are some caps labeled on the PCB3 which are not listed in the BOM:

C56, C63, C70, C78, C81

Does anyone who built this from the PCB know what value (or even better, Mouser #) these caps are? Were there any other components not listed in the BOM?

:guinness:

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captnapalm
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Post by captnapalm » Sat Oct 14, 2017 4:04 pm

jheronymo wrote:Hey everyone,

There are some caps labeled on the PCB3 which are not listed in the BOM:

C56, C63, C70, C78, C81

Does anyone who built this from the PCB know what value (or even better, Mouser #) these caps are? Were there any other components not listed in the BOM?

:guinness:
These caps aren't needed per Roman.

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jheronymo
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Post by jheronymo » Sat Oct 14, 2017 4:35 pm

captnapalm

can i leave them empty, or should i bridge them?

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captnapalm
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Post by captnapalm » Sat Oct 14, 2017 4:50 pm

jheronymo wrote:captnapalm

can i leave them empty, or should i bridge them?
leave them empty; that’s what i did

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jheronymo
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Post by jheronymo » Sat Oct 14, 2017 4:51 pm

captnapalm wrote:
jheronymo wrote:captnapalm

can i leave them empty, or should i bridge them?
leave them empty; that’s what i did
:guinness: :guinness: :guinness:

monzelio
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Post by monzelio » Thu May 03, 2018 3:30 pm

hi all- i recently got my 25S PCBs, they are version 2.0
Has someone built this version?
On Electric Music Store i found only version 1.0 BOM..

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