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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
LFO SLMS Question
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El Mop



Joined: Aug 20, 2012
Posts: 54
Location: Germany

PostPosted: Sun Dec 02, 2012 6:49 pm    Post subject: LFO SLMS Question Reply with quote  Mark this post and the followings unread

I just finished a LFO from the Sound Lab Mini Synth and so far it
is working fine.
But switched to Rectangle waveform (S18),
the waveform can still be influenced by the switch (S16) with
which you choose the waveform when Triangle is selected.
I didn´t expect this, so here is my question:
Is this behavior normal?
Or did I do a mistake?
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El Mop



Joined: Aug 20, 2012
Posts: 54
Location: Germany

PostPosted: Mon Dec 03, 2012 1:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

Any problem with the way I´m asking?
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wayoda



Joined: Dec 04, 2012
Posts: 5
Location: Germany

PostPosted: Tue Dec 04, 2012 9:58 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi El,
El Mop wrote:

Is this behavior normal?

Seems to be normal with the LFO from the original SoundlabMini.

Have a look at the SoundlabMiniPlus Schematic Page5.
The LFO uses a 2-pole switch for S18, and there is a note why this was changed from the original Mini.

Ray Wilson wrote:

S18 has been changed from a SPDT to a DPDT in order to insure that when you switch to "Rect" wave oscillation the diodes that cause ramp or sawtooth oscillation are not in the circuit. Formerly if you switched to "Rect" modulation with R16 switched to ramp or sawtooth, the Rect(angle) wave would be so narrow that it was ineffective for modulation. Now when you switch to "Rect" the LFO emits a square wave.


Eberhard
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El Mop



Joined: Aug 20, 2012
Posts: 54
Location: Germany

PostPosted: Tue Dec 04, 2012 12:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you Eberhard!
And of course for the hint with the Soundlab Mini Plus, too!
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