electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Articles  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links  |  Store
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
 Forum index » DIY Hardware and Software » YuSynth
vc LFO old pcb
Post new topic   Reply to topic Moderators: Scott Stites
Page 1 of 1 [7 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
ricochet



Joined: Oct 03, 2017
Posts: 4
Location: Münster, Germany

PostPosted: Tue Nov 21, 2017 11:16 am    Post subject: vc LFO old pcb Reply with quote  Mark this post and the followings unread

I have four of this older Yusynth vc-LFO pcb lying here to solder,
but I could'nt find any component-layout for this release..

1. Could anybody help ?
2. is this version useful or should I better stop working on that old one ?
3. are there any improvements for this pcb ?

Gerd


YuS vc-LFO2 pcb old.jpg
 Description:
this is the old LFO-pcb
 Filesize:  204.36 KB
 Viewed:  43 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

YuS vc-LFO2 pcb old.jpg



YuS vc-LFO1 wiring old.jpg
 Description:
older vcLFO pcb wiring
 Filesize:  88.68 KB
 Viewed:  41 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

YuS vc-LFO1 wiring old.jpg


Back to top
View user's profile Send private message
yusynth



Joined: Nov 24, 2005
Posts: 1311
Location: France

PostPosted: Sun Dec 03, 2017 9:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

_________________
Yves
Back to top
View user's profile Send private message Visit poster's website
yusynth



Joined: Nov 24, 2005
Posts: 1311
Location: France

PostPosted: Sun Dec 03, 2017 9:06 am    Post subject: Reply with quote  Mark this post and the followings unread

Posted Image, might have been reduced in size. Click Image to view fullscreen.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Posted Image, might have been reduced in size. Click Image to view fullscreen.Posted Image, might have been reduced in size. Click Image to view fullscreen.

_________________
Yves
Back to top
View user's profile Send private message Visit poster's website
g.gabba



Joined: Nov 29, 2008
Posts: 284
Location: berlin
Audio files: 18

PostPosted: Tue Dec 05, 2017 8:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Hallo Gerd,

you've asked: 3. are there any improvements for this pcb ?

--> there is one opamp "gate" unused, u could use it for having an inverted Saw, its there where the long bridge is beside the BC547
i would even guess that Yves has prepared it somehow for this purpose

the combination of R26/R27 can be 68k and 10k (factor 6,Cool if u are short of 150k and 22k

the combination of R28/R29 cold be changed, just keep the factor 10, eg: 1K/10k, 10K/100k, 22K/220K ..........................................

if u cannot find a 10k Pot for PW u can change the values also by keeping the factor. Or if u dont need to change the PW and want to save a pot and place on the Frontpanel, tie the positive input of U2c to ground to have a fixed pw of 50%.

cheers, bb
gabbagabi
Back to top
View user's profile Send private message
ricochet



Joined: Oct 03, 2017
Posts: 4
Location: Münster, Germany

PostPosted: Sun Jan 21, 2018 6:52 am    Post subject: variations between layout, BOM & schematic Reply with quote  Mark this post and the followings unread

there are some questionable differences between component-layout, schematics and BoM, so, for building ready these units,
I need a little help, please...

LFO1 (A):
A1 - Capacitor C8 is shown in schematics/BoM 1nF, but in component layout 47pF ?
A2 - C5 is in BoM 10nF, but in schematics/comp-layout 100nF (I decided 100nF)
A3 - R43 (47k) isn't listet in BoM (only on the bottom of it)
A4 - as I could't find an "old" wiring pic, I see no chance of "off-board mounting the R43 resistor, so my decision is a standing mounting with
one side in hole 1 and the other side in junction R32/34 (see pic below)


LFO2 (B):
B1 - Capacitor C8 is shown in schematics/BoM 1nF, but in component layout 47pF
B2 - C5 is in BOM 10nF, but in schematics/comp-layout 100nF (I decided 100nF)
B3 - R38 isn't in BoM, maybe mistake, because there is R39 (should be R38)
B4 - C7 is in schematics/BoM & new layout, but not in the old layout and latest wiring…should I leave it or try to place it ?
B5 - R10 is shown twice in schematics (at Sin/Tri sym and at PIN 3 of IC4)... should R10 at “SinTri” named R24 ?!
B6 - R18 is shown twice in schematics (right side at PIN 5 & 7) ...R18 at PIN 7 should it be there, because PIN 7 is not connected ?!
B7 - the second side of R43 is in "wiring" connect with "pulse", but not so in schematics: there R43 is on PIN8 (IC2c) & R41…what is right ?!


thanks for your patience
Gerd


IMG_20180121_142906197.jpg
 Description:
 Filesize:  1.21 MB
 Viewed:  16 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

IMG_20180121_142906197.jpg


Back to top
View user's profile Send private message
yusynth



Joined: Nov 24, 2005
Posts: 1311
Location: France

PostPosted: Sun Jan 21, 2018 8:28 am    Post subject: Reply with quote  Mark this post and the followings unread

There the wiring diagrams as found on the site


VCLFO1-wiring.jpg
 Description:
 Filesize:  118.23 KB
 Viewed:  19 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

VCLFO1-wiring.jpg



VCLFO2-wiring.jpg
 Description:
 Filesize:  88.68 KB
 Viewed:  20 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

VCLFO2-wiring.jpg



_________________
Yves
Back to top
View user's profile Send private message Visit poster's website
g.gabba



Joined: Nov 29, 2008
Posts: 284
Location: berlin
Audio files: 18

PostPosted: Sun Jan 21, 2018 10:37 am    Post subject: Reply with quote  Mark this post and the followings unread

A1: 47pF = B1
A2: 100nF =B2
A34: as i see it on ur foto u already have driiled a extra hole at the junction R32/34 - so why dont you drill a second one close to the base of the transistor?
or you could place it on on the solderside?

B3: R38 is in the old schematic one of the 10 Ohm Resistors
B4: C7 is not in the old schematic. if u dont have spikes in your (SAW) Waveform u dont need it - vice versa
B5: in the old schemo they are called r24 and r4
B6: R18 at pin7 could be there, it is the inverted SAW (Ramp) output, if u use it place the resistor there to protect the opamp out against shorting it to ground (also gegen nen Kurzen) this is most importand if u dont use banana
B7: in fact in the schemo it is connected to PULSE, but before the VoltageDivider, so the Base of the transistor would recive 15V pulses, may it is better to connect it like it is shown in the wiring
you could use any other output too, it would give you an other optical feedback, not just on or off, more fade in and out
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: Scott Stites
Page 1 of 1 [7 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » DIY Hardware and Software » YuSynth
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
e-m mkii

Please support our site. If you click through and buy from
our affiliate partners, we earn a small commission.


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use