sontec 1 RU build thread

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ilfungo said:
Hi
someone can give me the code (RS or Mouser) for Knobs?
thanks

What type of knobs?

Most RS and Mouser won't have the ones seen on first post.

Farnell have those Elma's, but not sure of all types tough.
http://fr.farnell.com/jsp/search/browse.jsp?N=2014+202401&Ntk=gensearch&Ntt=Elma&Ntx=mode+matchallpartial&locale=fr_FR&appliedparametrics=true&getResults=true&originalQueryURL=/jsp/search/browse.jsp%3FN%3D2014%2B202401%26Ntk%3Dgensearch%26Ntt%3DElma%26Ntx%3Dmode%2Bmatchallpartial%26No%3D0%26getResults%3Dtrue%26appliedparametrics%3Dtrue%26locale%3Dfr_FR%26divisionLocale%3Dfr_FR%26catalogId%3D%26skipManufacturer%3Dfalse%26skipParametricAttributeId%3D%26prevNValues%3D2014%2B202401


Electrochronic has them also, check with him:

https://sites.google.com/site/diypartsstore/catalog/catalog-page-2


T.
 
Hey! Im back from hell!! Good to have like 2 days to finish some of this :)
I just have a quick question.. The op amps, are u using the DOA for output and the 602 604 (sorry) for input ? Or viceversa? :)

Thanks a lot!
 
Ah one question! The kit came with traffo 2x24v 0.6A ..
1- Do i need to connect secondaries in series and just go from black to ~1 and yellow to ~2 on PSU pcb?

2 - what is this "G2 AB~" point on pcb for? And the +3 / ~G (are those for testing before plugging into the I/O boards?)

3- is there any grounding point that i might not be aware of? (i can only see those 2 G spots heheheh)

Traffo model: noratel TA030/25

Stereo sontec, without ms and without relay bypass.

Thanks a lot!
 
ptron said:
1- Do i need to connect secondaries in series and just go from black to ~1 and yellow to ~2 on PSU pcb?
2 - what is this "G2 AB~" point on pcb for? And the +3 / ~G (are those for testing before plugging into the I/O boards?)
3- is there any grounding point that i might not be aware of? (i can only see those 2 G spots heheheh)
Traffo model: noratel TA030/25
1- transformer secondaries black to ~1 and yellow to ~2 on PSU pcb.
2- transformer secondaries red+orange to "G2 AB~" (just have a look at "P1000010.jpg" and "ps_sch.JPG" in the .zip files from pg.1 of this thread 'Here you can find all docs')
3- you might use the "+3 / ~G" for 0V reference voltage/grounding.
 
as always, thanks a lot harpo. i thought that GND point wouldve been for grounding with chassis! im glad i asked first!

all the best

and again, thanks a lot for the quick reply
 
http://ij-audio.com/downloads/SONTEC_RED.rar
http://ij-audio.com/downloads/SONT_MS_UPGR.rar

for the updated docs, as well
 
hi, noob question...
in this  sontec eq is possible to add voltage control to any parameters? to use like a voltage control comb filter?
thanks in advances
 
ncl|usl said:
hi, noob question...
in this  sontec eq is possible to add voltage control to any parameters? to use like a voltage control comb filter?
thanks in advances

Nope)

From the oter side, possible to use VTL5C3/2 to control frequency; for the gain controls, check net for VCA use in digitally controlled eq's..
 
ok so is possible only for frequency . and for the q control ?
how it can be implemented? do you know some circuit to add for cv controll?
thanks igor, sorry i'm a newcomer in this forum!
 
Welcome and have fun.

Well, this VCA question is a bit OT. After all this is build support thread. In any case.

VCA's won't work for Q control for Sontec filters. Should be pot. Or it becomes bit complicated. For gain, see further.

I used relays in DC Uni-Q, fully digitally controlled universal EQ, and got good results with prototyped Sontec filters.
VCA's have many benefits, but not for every EQ's filter app.
Very nice paper on use of VCA's in EQ's:
http://www.thatcorp.com/datashts/AES13-031_Digitally_Controllable_Audio_Filters.pdf

However. After prototyping and listening.... VCA's can be cool for GAIN control - as in  fig 12 and 17, it worked for me; even possible to bring bit of 2nd harmonic for nice color.
For freq control, it is not ideal thingy. After all, vca's are hooked arround SVF, on high freqs, slowed transients are audible (what you guys call "harshness on highs).
With the relays, the quality of sound limited to quality of opamps/capacitors/right pcb layout/etc. With vca's, it is very flexible and relatively simple. The final app dictates the topology.
 
ok, thank you igor!
i will waith for the new project DC Uni-Q !
i also see the buchla 296e and its touch sensor-grafic equalizer
can be mounted in this layout ?  :-[
 
Kinda different things.
I cannot answer on this question, try to open a topic in lab section of forum ;)
 
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