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 Forum index » DIY Hardware and Software » YuSynth
losing lower frequencies drastically when resonance gets to
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bsmith



Joined: Mar 02, 2012
Posts: 5
Location: Dallas

PostPosted: Thu Nov 29, 2012 10:26 am    Post subject: losing lower frequencies drastically when resonance gets to Reply with quote  Mark this post and the followings unread

I finished building one of these and have been poking at getting it sounding right in my 12v euro rig. Started with the bridechamber kit - and going through the diodes to match pairs was a bit painful, so after not being satisfied with a first go with those I re matched some from a pile I had. Mine sounds mostly good, but I have a thing where just as I get into self oscilation - even a little, the bottom parts of the signal just drop out, like it suddenly sounds like a high pass filter. I've done the suggested changes for using in 12v, as well as lowering that 680k to 120k, and also made resistor changes when I saw that I was getting more like -7.5v on the -9v out - got that happening as well.
I think maybe I can do an even better job at matching resistors - after my second pass the 'bottom falling out' thing wasn't quite as bad, but it's still going on. Besides getting as tight a match on those pairs, are there any suggestions to getting that straightened out?
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Cardinen



Joined: Sep 15, 2009
Posts: 38
Location: Italy

PostPosted: Sat Dec 01, 2012 9:23 am    Post subject: Re: losing lower frequencies drastically when resonance gets to Reply with quote  Mark this post and the followings unread

bsmith wrote:
I finished building one of these....


one of these... what ? Surprised
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bsmith



Joined: Mar 02, 2012
Posts: 5
Location: Dallas

PostPosted: Sat Dec 01, 2012 9:26 am    Post subject: Re: losing lower frequencies drastically when resonance gets to Reply with quote  Mark this post and the followings unread

Cardinen wrote:
bsmith wrote:
I finished building one of these....


one of these... what ? Surprised



I am so sorry, meant to post in the diode ladder filter thread. Sad
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Cardinen



Joined: Sep 15, 2009
Posts: 38
Location: Italy

PostPosted: Sun Dec 02, 2012 8:01 am    Post subject: Reply with quote  Mark this post and the followings unread

Ok, i think is a normal behavior with ladders-type filter, mine do the same especially the Diode ladder.
I hope this help.
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bsmith



Joined: Mar 02, 2012
Posts: 5
Location: Dallas

PostPosted: Sun Dec 02, 2012 8:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Cardinen wrote:
Ok, i think is a normal behavior with ladders-type filter, mine do the same especially the Diode ladder.
I hope this help.


I hear ya, and after talking to a few other people I've heard the same.
Buuuuut - man had a sea devils filter in euro in the past, and I don't remember the bottom drop off to be this drastic, so maybe there is tweaking I can do to get it a little mo' better.
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yusynth



Joined: Nov 24, 2005
Posts: 1233
Location: France

PostPosted: Fri Dec 07, 2012 3:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

Loss of low-end at high resonance is a normal behavior for the ladder filters either with the Moog or the EMS filter. Cure for this can be added but these filters will no longer sound like the original ones.
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bsmith



Joined: Mar 02, 2012
Posts: 5
Location: Dallas

PostPosted: Sun Dec 09, 2012 6:36 am    Post subject: Reply with quote  Mark this post and the followings unread

yusynth wrote:
Loss of low-end at high resonance is a normal behavior for the ladder filters either with the Moog or the EMS filter. Cure for this can be added but these filters will no longer sound like the original ones.


Thanks very much for your reply Yves. What changes would be made that would address the lower frequencies dropping when resonance comes in?
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yusynth



Joined: Nov 24, 2005
Posts: 1233
Location: France

PostPosted: Sun Dec 09, 2012 7:31 am    Post subject: Reply with quote  Mark this post and the followings unread

The trick consists in picking the feedback signal after the Emphasis pot and adding a fraction of it to the output signal. This rquires simulation an calculations though and once again the filter will no longer behave like the original filter...
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