Splicer... (new mini-project)

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

Moderators: Kent, Joe., analogdigital, infradead, lisa, parasitk, plord, sduck

User avatar
snaper
Ultra Wiggler
Posts: 975
Joined: Mon Feb 10, 2014 12:29 am
Location: Magyarország

Post by snaper » Thu Jul 14, 2016 1:53 pm

Has somebody the schemo?
The picture on the first page is down :(

User avatar
synthcube
you will be assimilated
Posts: 2039
Joined: Wed Dec 21, 2011 6:42 pm
Location: Boston

Post by synthcube » Thu Jul 14, 2016 2:06 pm

here's the schematic
You do not have the required permissions to view the files attached to this post.

User avatar
snaper
Ultra Wiggler
Posts: 975
Joined: Mon Feb 10, 2014 12:29 am
Location: Magyarország

Post by snaper » Fri Jul 15, 2016 1:50 am

synthcube wrote:here's the schematic
Thank you very much!!!

User avatar
snaper
Ultra Wiggler
Posts: 975
Joined: Mon Feb 10, 2014 12:29 am
Location: Magyarország

Post by snaper » Thu Jul 21, 2016 2:31 pm

Last question, at some point I've lost in this thread.
So, is this OK for CVs?
Buchla implementation, so I have to know that should I put jacks or bananas to the wave inputs :D

locobitch
Common Wiggler
Posts: 106
Joined: Thu Apr 22, 2010 2:07 pm

Post by locobitch » Tue Apr 30, 2019 10:59 am

I just discovered the only module able to do this function and it was the Model 39 :/ Now i'm in search for this module but in eurorack.
J3RK do you have some kits for sale in eurorack ?

User avatar
synthcube
you will be assimilated
Posts: 2039
Joined: Wed Dec 21, 2011 6:42 pm
Location: Boston

Post by synthcube » Tue Apr 30, 2019 11:41 am

we offer the PCBs here, and have plans for a euro version...

locobitch
Common Wiggler
Posts: 106
Joined: Thu Apr 22, 2010 2:07 pm

Post by locobitch » Sat May 11, 2019 4:41 am

Some more questions.
It's possible to add some fade knob like on the model 39 ?
If yes anyone has a bom for the eurorack version ?

Ayab
Wiggling with Experience
Posts: 301
Joined: Wed Dec 18, 2013 7:19 am
Location: London, UK

Post by Ayab » Sat May 11, 2019 10:42 am

Hi locobitch

The bom from the schematic supplied a few posts up from Synthcube -

Resistors: 6 x 100k, 6 x 49.9k, 2 x 330ohm
IC: 1 x TL074 op amp
3 x Diodes (1N4148?)
6 x jack sockets - Type of jacks should not matter if there is no panel pcb.

Not shown: Power header socket, couple of beads or resistors and 2 x 10uf (or choice) electrolytic capacitors on power input and couple of 100n ceramic capacitors to decouple the ic.
Last edited by Ayab on Sun May 12, 2019 5:03 pm, edited 1 time in total.

locobitch
Common Wiggler
Posts: 106
Joined: Thu Apr 22, 2010 2:07 pm

Post by locobitch » Sat May 11, 2019 4:30 pm

Cool thanks Ayab :D Do you know if it's possible toi implement a turn knob like on the model 39 in parallel of the CV input ?

Ayab
Wiggling with Experience
Posts: 301
Joined: Wed Dec 18, 2013 7:19 am
Location: London, UK

Post by Ayab » Sun May 12, 2019 5:25 pm

A switched jack for the CV input with the switch connection normalled to +15V via a 100K resistor and the tip of the jack going to one outer connection of the pot, the other outer connection of the pot going to ground and the wiper of the pot going to the R11. 100K pot.

Then if the CV connection is not used the pot is a voltage divider and sends a voltage depending on the pot position and if a CV is connected the pot acts as an attenuator.

The attached picture makes this clearer.

Hope someone can please confirm that I am correct about this.
You do not have the required permissions to view the files attached to this post.

User avatar
soup
Wiggling with Experience
Posts: 500
Joined: Sun Dec 04, 2011 9:14 pm

Post by soup » Sun May 12, 2019 9:25 pm

The fader on mine wants wants +5V to -5V.

You could make 2 voltage sources and a dc mixer on a bit of stripboard but you'd double the size of the pcb.

Ayab
Wiggling with Experience
Posts: 301
Joined: Wed Dec 18, 2013 7:19 am
Location: London, UK

Post by Ayab » Mon May 13, 2019 9:06 am

Aah ok I see :oops: thank you for pointing that out, soup.

I think your suggestion for a small dc mixer on stripboard is a good one.

locobitch
Common Wiggler
Posts: 106
Joined: Thu Apr 22, 2010 2:07 pm

Post by locobitch » Wed May 15, 2019 9:45 am

The idea is to have a pot to manually change the slice point and not having to use uniquely the cv in for that.

User avatar
soup
Wiggling with Experience
Posts: 500
Joined: Sun Dec 04, 2011 9:14 pm

Post by soup » Wed May 15, 2019 11:27 am

The splice point can't be changed. The CV in (whether you add a knob or not) fades between the negative and positive sides of the waveform.

Post Reply

Return to “Music Tech DIY”