FAQ & Terms of UseFAQ & Terms Of Use   Wiggler RadioMW Radio   Muff Wiggler TwitterTwitter   Support the site @ PatreonPatreon 
 SearchSearch   RegisterSign up   Log inLog in 

Blacet new VCO vs. previous VCO
MUFF WIGGLER Forum Index -> Fractional Rack Modules  
Author Blacet new VCO vs. previous VCO
Just wondering in which respect the new VCO differs from it's antecessor?

It's just one switch which allows to swap the attentuated FM input from AC to DC while the antecessor is AC only?

Thus the new VCO has 2 FM ins (DC) plus one attentuated DC or AC-coupled FM input while it's forerunner got 2 DC-coupled FM ins and one attentuated AC-coupled in?

Correct? Any further differences?
The circuit is the same.
On old VCOs
you can add a panel mounted switch to bypass the AC cap.
There are convenient pads on the PCB for this mod.
Check the Blacet mods sticky.
Thanks! So it's just the switch. w00t

BTW I was just referring to the differences without modding.
what are the blacet vcos like? I keep meaning to get one to try out but end up getting sidetracked by things like the living vco and the bugbrand ones... ultimately I never end up with any of them due to money but I'd still like to know!
You can't go wrong with Blacet.

Here's some interesting information on the VCO in question:
Terry Michael (formerly Terry Mikulic) when he was a teenager, contributed a
significant number of the core circuits published in Electronotes magazine
(something like 50%, including the first state variable VCF using OTAs EN#33
Pg. 5, and EN#34 Pg. 16,17).

In particular, Terry perfected and published the "classic sawtooth engine".
While sawtooth reset designs had been published by Michael Suchoff (EN#49
Pg. 11) and Paul Titchener (EN#57 Pg. 8), Terry's design (EN#62 Pg. 14 Feb.
1976) is the most widely copied.

This design was picked up from Electronotes magazine by the engineers at
Moog Music Inc. and others. The design forms the basis for the VCOs used in
the Micromoog, Source, Prodigy and the other small Moog synths.

No money or acknowledgment was ever paid Terry for the design. It was not
legally required, since by publishing the design (at 22) he placed it in the
public domain.

Terry continued to improve the design over the next 25 years, and I
connected John Blacet with Terry Michael's updated and improved sawtooth
engine. This design is technically superior to the VCOs used in the Moogs
and all other copies of Terry's older design.

Unfortunately, John apparently did not realize that Terry is the originator
of the "classic sawtooth engine" and the other VCOs he studied were copies
of Terry's "first" design.

LUCKILY, in spite of the confusion, John Blacet kept the important parts of
Terry's new design and they appear in the Blacet VCO!

To summarize:

The Blacet VCO is the only commercial version of Terry Michaels "improved
sawtooth engine" (remember the old inferior version sold something like
50,000 copies).

The Blacet VCO is the ONLY version of the "sawtooth engine" officially
licensed from the originator of the design.

Best Regards,

Grant Richter
Wiard Synthesizer
tIB wrote:
what are the blacet vcos like? I keep meaning to get one to try out but end up getting sidetracked by things like the living vco and the bugbrand ones... ultimately I never end up with any of them due to money but I'd still like to know!

I haven't had one for a while but really liked them and would like to get another soon now that I'm rebuilding my frac rack.
Like all Blacet stuff, feature packed, well thought out and sounds great. The VC octave transpose jack seemed fairly unique and was really useful.
Thanks for the info's chaps- Im possibly a little filter heavy in the frac side so Im really tempted to add at least one of their oscs.

I love the blacet stuff, it's really nice as pulse said: feature packed and great sounding. I kind of promised myself if I lost any of the frac I have now it would be for bugbrand stuff so I may or may not follow through with it. Tough old life! lol
I've actually been missing the Blacet VCO - I sold mine a while back, but I think at some point in the near future I may re-buy a pair. The VC wave and octave jack are great, and it has such a nice sound.
the variable wave out on the blacet also sets it apart from most (serge and CGS also have). i have an embarrassing number of different modular oscillator types (15?), and blacets are my go-to faves.

One last question from me: how low does the blacet track?
well into lfo frequencies...
The Blacet VCO is really nice as an LFO.
It can go pretty slow (maybe even slower than Blacet Micro LFO),
and does high frequencies with ease as well.

I remember hearing that the VC Wave part of the circuit was of Grant Richter's doing.

The VC octave jack does come in handy.

It tracks really well when properly calibrated.

The Sync input can be picky, but the sounds are worthwhile.
It won't sync to a BugBrand Weevil without a Window Comparator in between to tune the sync.
Processing your sync signal (be it guitar or what have you) with EG1 or Window Comp. opens up a lot of sonic options.

For some reason the Metasonix TM-3 prefers to be driven by the Blacet VCO instead of the Cwejman VCO-6.

Sometimes I think about getting a second Blacet VCO.
They are kind of a bargain compared to other commercially available VCOs;
especially when you consider the quality and features.
Thanks for that snippet e-grad..I enjoy learning the history of the circuit.

It makes me appreciate my blacet vco more and desire a second to make an even pair. The sine is really nice. I use it as a sub-osc frequently.
MUFF WIGGLER Forum Index -> Fractional Rack Modules  
Page 1 of 1
Powered by phpBB © phpBB Group