New Syncussion with MIDI and Silent power - VIDEOS

From circuitbending to homebrew stompboxes & synths, keep the DIY spirit alive!

Moderators: luketeaford, Joe., lisa, Kent

Post Reply
User avatar
satindas
Veteran Wiggler
Posts: 669
Joined: Sat Jan 08, 2011 6:45 pm
Location: Wiltshire, United Kingdom

New Syncussion with MIDI and Silent power - VIDEOS

Post by satindas » Tue Jan 23, 2018 8:19 am

Finished the first prototype yesterday. :ripbanana:

Some painful debugging but now all working as expected

MIDI is via 3.5mm TRS

2 MIDI Modes:

Mode 1- Triggers from singe MIDI channel - note 36 = Ch1, note 38 = Ch2 Obviously no CV in this mode but individual control of Decay ( controllers 80 and 81 )

Mode 2 - Listens to 2 adjacent MIDI channels and currently receives TRIGGER, CV and DECAY on each channel. Not sure I can squeeze much else in there.

Panel mounted trigger buttons

Matched SMD Transistors

Retains original Power scheme but added Pi filter reduces switching noise to barely above noise floor. (No need for expensive DC-DC converter)



Image

-----------------------------------------------------------------------------


MOUSER BOM https://www.mouser.com/ProjectManager/P ... 1305e9618c

MOUSER/DIGIKEY BOM Cross-reference : VIEW IN GOOGLE DOCS

BUILD DOC: (v1.2) DOWNLOAD

MIDI REFERENCE DOC: DOWNLOAD
Last edited by satindas on Sun Apr 29, 2018 5:54 am, edited 10 times in total.
These are bizarre manifestations of untamed high-frequency parasitic oscillations...
www.psycox.co.uk

User avatar
nologin
Common Wiggler
Posts: 201
Joined: Thu Jan 21, 2016 2:53 am
Location: France

Post by nologin » Tue Jan 23, 2018 9:23 am

I love it. :love:

csaban
Learning to Wiggle
Posts: 38
Joined: Sun Aug 07, 2016 4:55 pm
Location: Glasgow

Post by csaban » Tue Jan 23, 2018 10:08 am

Nice!

What type of switches are those?

User avatar
nosotokarjazzy
Learning to Wiggle
Posts: 29
Joined: Fri Jun 10, 2016 2:48 am

Post by nosotokarjazzy » Tue Jan 23, 2018 10:28 am

Very nice... :yay:

User avatar
satindas
Veteran Wiggler
Posts: 669
Joined: Sat Jan 08, 2011 6:45 pm
Location: Wiltshire, United Kingdom

Post by satindas » Tue Jan 23, 2018 10:42 am

csaban wrote:Nice!

What type of switches are those?
MHS122K and MHS233K
These are bizarre manifestations of untamed high-frequency parasitic oscillations...
www.psycox.co.uk

User avatar
fuzzbass
Super Deluxe Wiggler
Posts: 2082
Joined: Thu Feb 06, 2014 6:08 pm
Location: Florida, USA

Post by fuzzbass » Tue Jan 23, 2018 11:16 am

Beautiful work! Highly under-appreciated drum synth! You are on the right track to re-do the power system. The way the negative supply rail is derived in the original is noisy and obsolete and source of many complaints from builders of zthee's clone. SY1 S&H is a bit odd in that it does not have a noise input and so is not particularly random sounding. My one other recommendation is to bring the LFO modulation source out the panel with an insert, so some alternate modulator (ex: noise) can be introduced.
Wired for weird

User avatar
satindas
Veteran Wiggler
Posts: 669
Joined: Sat Jan 08, 2011 6:45 pm
Location: Wiltshire, United Kingdom

Post by satindas » Tue Jan 23, 2018 11:55 am

fuzzbass wrote:Beautiful work! Highly under-appreciated drum synth! You are on the right track to re-do the power system.... ....... bring the LFO modulation source out the panel with an insert, so some alternate modulator (ex: noise) can be introduced.
Thanks , I read somewhere that by using a transformer based power supply the noise problem is overcome. I don't have a suitable one so can't comment on that but you are right in that the original is a quite noisy unless you have both Output Level sliders at max.
Good call on the external S/H input but I don't want to clutter the panel with sockets. I suppose one option might be to route both LFO and Noise to the S/H via a switch.... internal noise is pretty low level though :hmm:
These are bizarre manifestations of untamed high-frequency parasitic oscillations...
www.psycox.co.uk

jimfowler
Veteran Wiggler
Posts: 589
Joined: Mon Feb 22, 2016 1:13 pm
Location: New York
Contact:

Post by jimfowler » Tue Jan 23, 2018 2:16 pm

Very cool!

User avatar
Bjarne
Common Wiggler
Posts: 101
Joined: Sat Jul 20, 2013 10:31 am
Location: Stockholm

Post by Bjarne » Tue Jan 23, 2018 2:20 pm

This looks great! I’ve been wondering which would become my first DIY drum synth....

Cheers

User avatar
roglok
Super Deluxe Wiggler
Posts: 2441
Joined: Fri Dec 30, 2011 3:49 pm
Location: germany

Post by roglok » Tue Jan 23, 2018 2:31 pm

yesss!!! was really put off by the way the zthee clone went and was secretly hoping for someone else to take a stab at it. having borrowed an original syncussion once i have to say that it is a magical device.

keeping a close eye on this...
:party:

User avatar
sanders
Veteran Wiggler
Posts: 735
Joined: Tue Feb 03, 2009 4:42 pm

Post by sanders » Tue Jan 23, 2018 4:01 pm

fantastic; would love to build one of these

I love that you're doing it as a 1:1 clone

User avatar
drox
Wiggling with Experience
Posts: 294
Joined: Mon Jun 06, 2011 8:29 am
Location: Sydney AUS

Post by drox » Tue Jan 23, 2018 11:27 pm

super keen on this too!

User avatar
Bodo1967
Veteran Wiggler
Posts: 623
Joined: Wed Aug 10, 2016 2:27 pm
Location: Germany

Post by Bodo1967 » Wed Jan 24, 2018 3:47 am

sanders wrote:fantastic; would love to build one of these
Me too :sb: :mrgreen: :nana: !
... why buy it for $100 when you can build it yourself for $150?

makho
Learning to Wiggle
Posts: 20
Joined: Tue Jan 16, 2018 12:30 pm

Post by makho » Wed Jan 24, 2018 12:18 pm

oh wow. :omg:

goodrevdoc
Learning to Wiggle
Posts: 30
Joined: Mon Sep 19, 2016 12:09 pm
Location: Right Near da Beach

Post by goodrevdoc » Thu Jan 25, 2018 12:33 am

Awesome work. Would love one or two of these

User avatar
heapish
Veteran Wiggler
Posts: 542
Joined: Mon Mar 11, 2013 5:27 pm
Location: Lancashire UK

Post by heapish » Thu Jan 25, 2018 6:10 am

Interested. Please upgrade the power section to get rid of noise.

User avatar
jersupereq
Common Wiggler
Posts: 241
Joined: Sat Aug 16, 2008 9:24 pm
Location: SF

Post by jersupereq » Thu Jan 25, 2018 12:37 pm

Where do I sign up?
:hail:

User avatar
batchas
Super Deluxe Wiggler
Posts: 4705
Joined: Wed Nov 09, 2011 2:51 pm

Post by batchas » Thu Jan 25, 2018 1:11 pm

Niiiiice :yay:

User avatar
satindas
Veteran Wiggler
Posts: 669
Joined: Sat Jan 08, 2011 6:45 pm
Location: Wiltshire, United Kingdom

Post by satindas » Thu Jan 25, 2018 1:25 pm

heapish wrote:Interested. Please upgrade the power section to get rid of noise.
Done !

Just needed a bit of filtering on the TL497 output.

That unbearable squeal is now barely above the noise floor and doesn't increase with low output level.

Image

Easy fix for existing syncussion users too.

Image
Last edited by satindas on Thu Jan 25, 2018 5:33 pm, edited 1 time in total.
These are bizarre manifestations of untamed high-frequency parasitic oscillations...
www.psycox.co.uk

User avatar
mbroers
Wiggling with Experience
Posts: 272
Joined: Mon Mar 26, 2012 5:02 pm
Location: Chicago, IL

Post by mbroers » Thu Jan 25, 2018 1:52 pm

NICE!

User avatar
tjs
Common Wiggler
Posts: 55
Joined: Sat May 30, 2009 7:17 pm
Location: Berlin

Post by tjs » Thu Jan 25, 2018 2:58 pm

Cool. I'm very interested.

User avatar
lasesentaysiete
Super Deluxe Wiggler
Posts: 1520
Joined: Thu Feb 18, 2016 5:23 am
Location: Barcelona

Post by lasesentaysiete » Thu Jan 25, 2018 3:04 pm

Home run Jack!

User avatar
Altitude909
Super Deluxe Wiggler
Posts: 3451
Joined: Wed Aug 24, 2011 5:13 pm
Location: Meesheegan

Post by Altitude909 » Thu Jan 25, 2018 3:27 pm

interested as well

User avatar
yan6
Ultra Wiggler
Posts: 956
Joined: Sat Jun 15, 2013 7:14 pm
Location: Ontario, Canada

Post by yan6 » Thu Jan 25, 2018 3:48 pm

Altitude909 wrote:interested as well
+1

User avatar
stevenclements
Common Wiggler
Posts: 145
Joined: Tue Aug 04, 2009 3:55 pm
Location: e-town Alberta Canada

Post by stevenclements » Thu Jan 25, 2018 4:46 pm

YES YES YES YES


I'll take 2

:hail:
life is a treasure... dig it!

Post Reply

Return to “Music Tech DIY”