[sdiy] Question about LFOs

[Pete Swarbrick]

David

I have a total of six MS-20 style LFOs in two triple modules. After some
time using them I beefed-up the variable ramp output from +/- 2.5V to
+/- 5V on all LFOs in one module just to see how often it would be
useful and ended up doing the other one too. Love the circuit, it's
simple, repeatable and flexible plus I use the variable ramp pretty much
ALL the time and would be lost without it. 

Just some thoughts

Pete


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of David G. Dixon
Sent: 12 March 2009 07:56
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] Question about LFOs

Here's a noob-ish question about LFOs.  First, some background:

I'm developing a module with four non-voltage-controlled LFOs with
variable
pulse-width saw-triangle-ramp and pulse outputs.  I've simulated both
the
Korg MS-20 modulation generator (with its two JFETs driving the
integrator)
and Ray Wilson's Multi-waveform LFO, sans sine-shaper (with its two
diodes
driving the integrator), each with a few minor modifications.  The Korg
circuit generates (roughly) a 0 to 5V pulse and a -2.5 to +2.5 V
triangle.
The MFOS circuit generates (roughly) -5 to +5 V pulse and triangle.

My question is this:  Is there some "standard" for LFO voltage output,
and
if so, what is it?  Also, would it be desirable to be able to switch
between
-5 to +5 V and 0 to +/-5 V outputs?

David G. Dixon
Professor
Department of Materials Engineering
University of British Columbia
309-6350 Stores Road
Vancouver, B.C. V6T 1Z4
Canada
 
Tel 1-604-822-3679
Fax 1-604-822-3619
 
"PERFECTA FINGAMUS SERVIAT NATURA"
 
The information in this email and in any attachments is confidential and
intended solely for the attention and use of the named addressee(s).  It
must not be disclosed to any person without the writer's authority.  If
you
are not the intended recipient, or a person responsible for delivering
it to
the intended recipient, you are not authorized to and must not disclose,
copy, distribute, or retain this message or any part of it.

_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

checked by CanIt4