The Sontec thread! <ATT. BUILDERS - C22 & C23>
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TomWaterman
Well-known member
I remember reading that George Massenburg was experimenting with T-filters when he stumbled across the parametric eq!.......
Tom
Tom
Infernal_Death
Well-known member
I am finally back at this unit. Just took it apart and began to test the filter boards. Just started on channel 2 and all filter boards pass audio when they are connected to the amp board only one each time. Right now i am in the process of testing them together. So far i connected filter boards c-e and all run. On filter board E i get quite some oscillation when setting the frequency pot to the highest frequency and then crank the level pot.
I will look into that later, right now i want to test all filter boards if they pass audio.
Channel 1 is still dead but i will look into this after channel 2 is working. It just seems like channel 1 has more problems so i try to fix the channel with less problems to have one running channel to compare.
Flo
I will look into that later, right now i want to test all filter boards if they pass audio.
Channel 1 is still dead but i will look into this after channel 2 is working. It just seems like channel 1 has more problems so i try to fix the channel with less problems to have one running channel to compare.
Flo
Infernal_Death
Well-known member
Ok finished testing for today. Seems like Filter board A on channel 2 is the culprit. I connected filter boards b-e and everything was ok. When i connected filter board A it immediately started to distort. So i will disassemble the filter board and try to find the mistake.
But it's good that there now is some progress with this project. :grin:
Flo
But it's good that there now is some progress with this project. :grin:
Flo
Infernal_Death
Well-known member
Yeah it's warm here too so my motivation to test isn't actually that great (plus i really need to practice guitar more but the heat isn't a good thing while practicing).
I only listened to the oscillation. I just tested if the unit passes audio and heard it while turning the pots. It was quite hearable :green:
Flo
I only listened to the oscillation. I just tested if the unit passes audio and heard it while turning the pots. It was quite hearable :green:
Flo
hi folks, do ya think is possible to use the neumann boosting amplifer V472
like a amp section for the sontec filter section ?
wat do ya think?
http://www.gyraf.dk/schematics/Neu_472.gif
like a amp section for the sontec filter section ?
wat do ya think?
http://www.gyraf.dk/schematics/Neu_472.gif
Infernal_Death
Well-known member
Fabio all my channels are stuffed with Melcors.
My second channel now passes audio. But it's quite a bit distorted and i also got some hiss.
Channel 1 still got some problems. Sometimes my "+" voltage drops from +18V to -0,9V and after some time a resistor from the melcor on the filter board d starts to make some smoke signals. :shock: At the beginning it passes audio very distorted (with no filter board hooked up) but stops working after a while. After that the resistor starts the smoke (the filter boards are all hooked up to the voltage supply).
Man this really will be some work :shock:
Anybody got any tips about how to best tune the bias settings on the filter boards ?
Flo
My second channel now passes audio. But it's quite a bit distorted and i also got some hiss.
Channel 1 still got some problems. Sometimes my "+" voltage drops from +18V to -0,9V and after some time a resistor from the melcor on the filter board d starts to make some smoke signals. :shock: At the beginning it passes audio very distorted (with no filter board hooked up) but stops working after a while. After that the resistor starts the smoke (the filter boards are all hooked up to the voltage supply).
Man this really will be some work :shock:
Anybody got any tips about how to best tune the bias settings on the filter boards ?
Flo
Flo,
A good pratice, when powering up stuff, is:
1) Left the amps out
2) Turn it up
3) Measure the DC voltages on the opamps pins (on the sockets). Here check if you got the right +V -V Ground must be ok.
gotta go!!! I´ll think about more thinks later
cheers!
Fabio
A good pratice, when powering up stuff, is:
1) Left the amps out
2) Turn it up
3) Measure the DC voltages on the opamps pins (on the sockets). Here check if you got the right +V -V Ground must be ok.
gotta go!!! I´ll think about more thinks later
cheers!
Fabio
TomWaterman
Well-known member
Awesome Jaakko!!
I can´t wait to see this - all those 992s man its going to look sick!
Just curious Fabio - but once someone gets this running and the project validated, will you be doing another run of boards for this (still got some left??)...I´ve got some cash now and would be very interested.
Cheers Tom
I can´t wait to see this - all those 992s man its going to look sick!
Just curious Fabio - but once someone gets this running and the project validated, will you be doing another run of boards for this (still got some left??)...I´ve got some cash now and would be very interested.
Cheers Tom
TomWaterman
Well-known member
WOW!! Jaakko! Looking great..... 
Neat idea with the mounting modules - am I right that just the force of the switches screwed to the front will hold the modules in place?
You have implemented Rogys peak/shelf idea and your cut/boost switch - have you got these working on the bench with audio going through the filter cards yet?
Cheers Tom
Neat idea with the mounting modules - am I right that just the force of the switches screwed to the front will hold the modules in place?
You have implemented Rogys peak/shelf idea and your cut/boost switch - have you got these working on the bench with audio going through the filter cards yet?
Cheers Tom
rafafredd
Well-known member
Awesome!
MikoKensington
Well-known member
I have quite the boner right now!
Very nice work. :guinness: :sam: :guinness: :sam: :thumb:
Very nice work. :guinness: :sam: :guinness: :sam: :thumb:
TomWaterman
Well-known member
Ha!
WoMP?????
Get busy..... :razz:
Use the force Jedi
Tom
WoMP?????
Get busy..... :razz:
Use the force Jedi
Tom
If anyone else wants to try out a metal bracket mounting system, you might check out this:
http://www.wiseguysynth.com/larry/bracket.htm
These are designed for use with synth modules & you're pretty much stuck with the hole spacing, but it's a good product at a good price from a good guy.
Just FYI
Tom
http://www.wiseguysynth.com/larry/bracket.htm
These are designed for use with synth modules & you're pretty much stuck with the hole spacing, but it's a good product at a good price from a good guy.
Just FYI
Tom
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