Blacet modifications

Blacet, Metalbox, Synthasonic, PAiA and the rest.... a frac frenzy!

Moderators: luketeaford, Joe., lisa, Kent

User avatar
panda30y
Super Deluxe Wiggler
Posts: 1194
Joined: Thu Jan 22, 2009 8:14 pm
Location: Detroit

Post by panda30y » Sat May 02, 2009 4:34 pm

Is it easy to modify the blacet modules for banana jacks?

sandyb

Post by sandyb » Sat May 02, 2009 5:25 pm

panda30y wrote:Is it easy to modify the blacet modules for banana jacks?
afaik it's not too bad. get hold of bananaplug - pretty sure he's done a few

User avatar
panda30y
Super Deluxe Wiggler
Posts: 1194
Joined: Thu Jan 22, 2009 8:14 pm
Location: Detroit

Post by panda30y » Sat May 02, 2009 5:29 pm

Yeah, I had the same thought too... I should just PM him I suppose.

User avatar
fluxmonkey
Super Deluxe Wiggler
Posts: 1832
Joined: Sat Oct 18, 2008 10:05 pm
Contact:

Post by fluxmonkey » Sat May 02, 2009 7:55 pm

D/A A/D wrote:Anyone know how to mod the DSC to hold open?
i just replaced the pushbutton on mine with a toggle switch: spdt, center off, one side momentary.

bbob
www.fluxmonkey.com

BUILDER FOR HIRE - kits or custom, email me with your needs

Randaleem
is banned
is banned
Posts: 384
Joined: Mon Mar 23, 2009 5:06 pm

Post by Randaleem » Sun May 03, 2009 12:16 am

fluxmonkey wrote:i just replaced the pushbutton on mine with a toggle switch: spdt, center off, one side momentary. bbob
My favorite Switch! IMO Many locations benefit having momentary downwards, locking upward. All EG's for example. I much prefer it to a red PB.

Kind regards, Randal

User avatar
Reese P. Dubin
Super Deluxe Wiggler
Posts: 1357
Joined: Wed Dec 17, 2008 12:33 pm
Location: Absolute Elsewhere

Post by Reese P. Dubin » Mon May 04, 2009 4:57 pm

SUPER EASY to mod to bananas. I even did the Hex Zone which mounts the jacks on individul boards...again really easy.

BananaPlug charted the path for all of us, he made it simple for the followers.

User avatar
Gloworm
Learning to Wiggle
Posts: 17
Joined: Fri Jan 23, 2009 10:19 pm
Location: Space is the place

edit

Post by Gloworm » Mon Jun 01, 2009 12:49 am

edit

User avatar
antennafarm
Wiggling with Experience
Posts: 263
Joined: Thu Dec 04, 2008 2:05 pm
Location: Delta City, MI

DSC output mod?

Post by antennafarm » Sun Jun 07, 2009 7:30 pm

i have a rev 0 dark star chaos... where's the output mod? the page on hotrodmotm mentions it with a link to blacet's site buuuuuut that info is no longer on the tech page!

[edit!]

i contacted john blacet and he says:
The rev B board has an amplifier to boost the output level. This is just a
basic op amp circuit.
Last edited by antennafarm on Thu Aug 06, 2009 12:30 am, edited 3 times in total.

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

Post by stevenclements » Tue Aug 04, 2009 4:05 pm

I just bought a Blacet DF2420 Dual Manual Filter Bare PCB and pot kit...

will be interested to hear this in action :nana:

Steve

User avatar
BananaPlug
Super Deluxe Wiggler
Posts: 2617
Joined: Wed Dec 05, 2007 10:37 pm
Location: PHL USA

Post by BananaPlug » Tue Aug 04, 2009 4:47 pm

Here's my bananaified DF2420. You can see the two toggles I've added to replace the normals.
Image :banana:

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

Post by stevenclements » Wed Aug 05, 2009 9:28 am

Very nice bananaified DF2420! :yay:

I was thinking of a synth.com or a motm panel as the whole kit is no longer available for this puppy, and I've got nothing but room in those racks.
sdc
life is a treasure... dig it!

User avatar
parasitk
Learn to swim
Posts: 4939
Joined: Thu May 15, 2008 11:47 am
Location: Lost Angeles
Contact:

Post by parasitk » Wed Aug 26, 2009 1:09 pm

BananaPlug wrote:You know, I'll have to look at it and get back to you tomorrow. It's similar to something I did on another module and I don't want to get my stories mixed up.

EDIT: Sorry for the delay. Here's a picture of what I did. Very simple.Image
Thread necromancy!

Noob question: Will this pullup resistor concept work for most switching jack situations, or is the Gate(RST) jack unique?

I think I'm going to start converting my Frac to banana, but honestly I'm a tad overwhelmed at what to do w/o fucking things up.

User avatar
Cat-A-Tonic
Lobsters love Muff
Posts: 3734
Joined: Mon Feb 04, 2008 12:03 am
Location: Yokohama, Japan

Post by Cat-A-Tonic » Sun Jun 20, 2010 7:41 am

Here is a link to DGTom's Klangwerk modification thread.
viewtopic.php?t=12427&highlight=klangwerk+mod
It really belongs with these other links in this thread so that others may find it more easily.

In other news,
I've repanelled a few Blacet modules to make space in the rig and increase density.
The Mixer Processor, Mini-Wave, and I/O are now in home-made 1FU panels.
The I/O has the 1/4" jack and breakout switches for impedance and +5v options (replacing the DIP switches on the board) mounted in a Frac ear.

Here is a pic of the Mix/Proc:
Image
I am still undecided as to whether I should paint it,
stamp it with letter punches, and infill with lacquer sticks,
or just leave it as is with the dymo labels...

User avatar
werock
Ultra Wiggler
Posts: 835
Joined: Thu Apr 23, 2009 3:38 am
Location: London

Post by werock » Fri Oct 29, 2010 3:33 am

I was thinking of modifying my seq switch to have an external reset - it would seem a useful thing to have.

My seq switch has already been modified so the dip switch that selects between 3/4 steps has been brought out to the front panel with LEDS for each step, plus an unused extra socket on the front panel. I could just wire up the extra socket as a clock thru, but I like the idea of an external reset.

Has anyone done something like this? I guess it just needs a couple of transistors & resistors to buffer the input.

Mark Space-Ratio
Learning to Wiggle
Posts: 9
Joined: Sun Apr 25, 2010 8:07 am
Location: Sydenham, London

Post by Mark Space-Ratio » Fri Dec 10, 2010 2:30 pm

I want to raise the o/p level of my early DSC but there are no references as to how to do this anymore.
Any pointers?
cheers
¬¬¬

User avatar
DGTom
Super Deluxe Wiggler
Posts: 2615
Joined: Tue Aug 19, 2008 2:42 am
Location: Pt.Adelaide, Sth.Aust.

Post by DGTom » Wed Mar 23, 2011 8:39 pm

super-simple "mod" for the OG Frequency Divider;

All the divided outs are buffered by a 4050 Hex Buffer, swap it for a 4049, the inverting version & you get divisions you can build drum parts with :tu:

I also modded mine to have 4 fixed outs & 1 selected by the rotary switch, it required cutting a trace to get an extra buffer - or free the one from the multed one on the panel - but its a pretty cool beat-box now :D

My next experiment will be with the Reset In, at the moment it 'holds' the counter with for as long as the gate lasts... trying to sync multiple dividers this can be a pain.

User avatar
Adam-V
Count Modula
Posts: 1514
Joined: Mon Jul 27, 2009 1:08 am
Location: Melbourne, Australia

Post by Adam-V » Wed Mar 23, 2011 11:17 pm

Great info!

Try ken's gate to trigger trick. A cap, diode and resistor might just sort your reset issue out.

Cheers,
Adam-V

User avatar
BananaPlug
Super Deluxe Wiggler
Posts: 2617
Joined: Wed Dec 05, 2007 10:37 pm
Location: PHL USA

Time Machine Filter Mod

Post by BananaPlug » Sat Apr 02, 2011 2:11 pm

The Time Machine has clever filtering to reduce the BBD clock noise and deal with increasing aliasing from lower sample rates as delays get longer. The clever part is using switched capacitor filter chips. One on each end of the BBD. These filters take a clock input which determines the cutoff frequency. The BBD clock is a lot faster than what the filters use so there's a chip dividing it by 20. It's a slick way to get everything to track as delay time is adjusted.

after playing with the TM for a while I could see the appeal of having it go all dark and murky as you stretch out the delay. On the other hand I wouldn't mind hearing more BBD artifacts in return for not having so much of the signal rolled off.

So, here's the mod: Change the clock divider from /20 to /16. The dual decade counter U9 is setup as a divide by 10 feeding a divide by 2. I put in a binary counter setup as a divide by 4 feeding a divide by 4.

1. Remove U9 (CD4518)
2. Obtain a CD4520 and do a little jewelry work:
Image
4. Stick a cutoff resistor lead in pin 11 of the socket
5. Plug in your creation and attach that lead to pin 12
Image
6. Check your work.

The result is more subtle than I expected but sounds pretty good. Here's a few minutes of noodling around. Blacet VCO to VCA to Time Machine. It starts out dry. The wilder stuff is in the second half.

Have fun! :nana:

edit: Hmm, I thought I'd annotated this already but...
The fact is, this divider is part of a PLL so the effect on the filter clock is reversed. You can try dividing by 24 or 21 but you'll probably start hearing the whine of the clock along with any extra signal you get.
Last edited by BananaPlug on Tue Dec 30, 2014 3:05 pm, edited 1 time in total.
(Sounds)--> :eek:
"It's an amazing thing, whatever it may be."

User avatar
PrimateSynthesis
Super Deluxe Wiggler
Posts: 3428
Joined: Tue Mar 15, 2011 6:50 pm

Post by PrimateSynthesis » Fri May 13, 2011 8:34 am

BananaPlug asked me to post here from my Time Machine thread
viewtopic.php?t=34693
in For Sale/Trade.

While I would prefer not to post schematics that would include part of John Blacet's design, I am willing to answer any questions.

In order to have continuously variable input aliasing, a panpot circuit -- built on a little daughter board -- goes from the input (R27) to the amp before the filter (R27) and the amp after the filter (R23). It uses the same resistor values. Since it is looking into the exact same impedances, the mod is invisible to the rest of the circuit. It does not require cutting traces or replacing any components, so the mod is completely non-invasive, and can be easily removed.

Since the Time Machines uses TL074's, I used a TL072, the dual version of the same amp.

User avatar
Cat-A-Tonic
Lobsters love Muff
Posts: 3734
Joined: Mon Feb 04, 2008 12:03 am
Location: Yokohama, Japan

Post by Cat-A-Tonic » Tue Dec 13, 2011 8:30 pm

Blacet Sequential Switch modification.

Quoted from WeRock:
Ok, here's a couple of photos and brief explanation (bearing in mind I didn't do the mods)

Underside of PCB:



4 tiny holes have been drilled in the PCB - 3 are for the stage out LEDS, which connect via a resistor to the IC pins and 1 for a common ground connection. The white wire from pin 8 is the ground connection.

Top Side:



Ignore the gray, pink & orange wires, they are for the 3/4 stage select switch which has been brought out to the front panel.

The white ground wire from the first pic doesn't have any insulation on this side, so you can just see the bare wire marked 'GND' next to the 3rd jack down. This connects one leg of all the LEDs to ground.

The 3 stage out wires that we saw on the underside connecting to the IC pins are the legs of the 3 vertically mounted resistors, with wires going from the other eend of the resistors to the LEDS.

Electrically it is all quite simple, just connect the resistors directly to pins 3, 2 & 4 of the 4017 chip and the other end to the LEDs. It just involves drilling through the PCB, which could of course end in

And you have to drill holes in the panel for the LEDs.

I'll do my best to answer any more questions...
Please put the pics here when you get a chance WeRock.

User avatar
werock
Ultra Wiggler
Posts: 835
Joined: Thu Apr 23, 2009 3:38 am
Location: London

Post by werock » Wed Dec 14, 2011 2:33 am

Here you go...

Underside of PCB:

Image

4 tiny holes have been drilled in the PCB - 3 are for the stage out LEDS, which connect via a resistor to the IC pins and 1 for a common ground connection. The white wire from pin 8 is the ground connection.

Top Side:

Image

Ignore the gray, pink & orange wires, they are for the 3/4 stage select switch which has been brought out to the front panel.

The white ground wire from the first pic doesn't have any insulation on this side, so you can just see the bare wire marked 'GND' next to the 3rd jack down. This connects one leg of all the LEDs to ground.

The 3 stage out wires that we saw on the underside connecting to the IC pins are the legs of the 3 vertically mounted resistors, with wires going from the other eend of the resistors to the LEDS.

Electrically it is all quite simple, just connect the resistors directly to pins 3, 2 & 4 of the 4017 chip and the other end to the LEDs. It just involves drilling through the PCB, which could of course end in :sadbanana: :sadbanana: :sadbanana:

And you have to drill holes in the panel for the LEDs.

I'll do my best to answer any more questions...

idiotunderground
Common Wiggler
Posts: 108
Joined: Sat Sep 03, 2011 1:13 pm

Post by idiotunderground » Wed Dec 14, 2011 11:39 am

anyone else attempted seq switch mods?

User avatar
e-grad
Super Deluxe Wiggler
Posts: 3317
Joined: Tue Oct 07, 2008 5:55 am
Location: Berlin

Post by e-grad » Wed Dec 14, 2011 11:42 am

werock wrote:Electrically it is all quite simple, just connect the resistors directly to pins 3, 2 & 4 of the 4017 chip and the other end to the LEDs. It just involves drilling through the PCB, which could of course end in :sadbanana: :sadbanana: :sadbanana:
One could always use longer wires to avoid any drilling through the pcb.

User avatar
Cat-A-Tonic
Lobsters love Muff
Posts: 3734
Joined: Mon Feb 04, 2008 12:03 am
Location: Yokohama, Japan

Post by Cat-A-Tonic » Wed Dec 14, 2011 6:26 pm

Drilling through PCBs is not difficult.
I have done it on several occasions when no provision for standoff mounting holes was provided.

If you have to drill holes in a PCB, be sure to:
- avoid circuit traces,
- put some scrap wood under the PCB,
- start with a very small diameter drill-bit to make a pilot hole,
- where a mask to avoid breathing in nasty fiberglass dust.

Sorry if all that was painfully obvious.

User avatar
e-grad
Super Deluxe Wiggler
Posts: 3317
Joined: Tue Oct 07, 2008 5:55 am
Location: Berlin

Post by e-grad » Thu Apr 26, 2012 6:59 am

Babaluma wrote:1 x Blacet EG1 with the following mods:
A) Separate three position switches on the Attack and Decay parameters, to give you Log., Lin., or Exp. curve responses
I just want to make sure that I've understand how the mod above is done:

Inverted out to the switch contact of the CV In jack = expotential; the normal out to the switch contact = log. An on/off/on switch inbetween the outs and the jacks allows to choose btn log, exp and lin?

Post Reply

Return to “Fractional Rack Modules”