sontec 1 RU build thread
- Thread starter dagoose
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Help Support GroupDIY Audio Forum:
ArnauTS
Well-known member
Wich opamps you are using or going to use?ilfungo said:
ilfungo said:
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.
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!
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!
Harpo
Well-known member
1- transformer secondaries black to ~1 and yellow to ~2 on PSU pcb.ptron said:
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.
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.
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.
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