LFO voltage?

[Tony Allgood]

Hi all,

My LFOs are bipolar swinging between +5 and -5 volt. Theres no need to
go much higher than this. Besides the classic tri-sqr LFO from two
op-amps has tri output at half of the supply voltage. You would need an
extra amp to get this any higher. In most applications you will have
your LFO driving a voltage summer in the next module, therefore you
could set the fixed pot, eg. tune on a vco, a little higher and lower to
suit your taste. BUT... when using square wave I find that I like a
unipolar positive only output on the vco and vcf. This means as you turn
up the modulation, the pitch always goes up from your pressed note,
trills are more natural this way. This may also apply to S/H outputs on
VCF modulation. So it may be best to incorporate a offset pot on the
output of your LFO module. This way you can have any type of output. If
you give the pot a range of +5 to -5, and limit all wave outputs to the
same range you should be very happy.

I also find that a square wave is best when slewed a little. Fast edges
lead to CV breakthrough which I don't like at all. The Stuntman album by
Edgar Froese has a nasty bit of cv breakthrough on the VCA, probably
deliberate, but it really drives me insane.

Regards,

Tony Allgood, Cumbria, UK

Rack mounted moog filter and the TB3030 SuperBassline projects:

http://aupe.phys.andrews.edu/diy_archive/schematics/oakley/