commonsound forum: Tremulus Lune & Panneur => LFO output?

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LFO output? [message #1649]

Tue, 03 July 2007 15:59

sonicvi
Messages: 4
Registered: September 2005

Junior Member

Would it be possible to use the tremulus as an external LFO for another pedal? Could I just wire the leads of the photoresistor in place of a fixed resistor or pot wired as a variable resistor and control anything provided the photoresistor is giving me the range of resistance that is required, or would there be more to it than that?

[Updated on: Tue, 03 July 2007 16:00]

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Re: LFO output? [message #1651]

Tue, 10 July 2007 11:28

dann
Messages: 829
Registered: December 2002
Location: Austin TX

Senior Member

Yes you can do exactly that!
the only other thing to keep in mind is the transfer curve... that is, even if the LFO is a linear (straight) triangle wave, the resistance might change in a more logarithmic fashion. You can make graphs and charts for your particular LED/CdS, or you can just plug it in, see how it sounds, and then adjust your LFO
Have fun Wink

[Updated on: Tue, 10 July 2007 11:31]

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Re: LFO output? [message #2698]

Tue, 12 July 2011 04:59

Grazioso
Messages: 2
Registered: July 2011

Junior Member

Hi guys!

my name is sebastian and i´m from austria! great pedal!!!

i also wanted to make an LFO output to use it for other pedals. it would be cool if it is depending on the depth knob, or has its own depth knob!
but my problem is that the signal always has an - I think the right term is - Offset!
So when i connect the cv signal for example to the pitch of a synth, it pitches the whole synth signal up and modulates it "there"... so it works, but not quite right!

i connected the tip of the cv jack to Depth 3 and the sleeve to ground.

i also tried the tip to 4558 pin 1, since i read this in another forum, but then it is not depending on the depth knob...

would be thankful if you could help me out!

Servus from austria
sebastian

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Re: LFO output? [message #2700]

Mon, 18 July 2011 12:57

dann
Messages: 829
Registered: December 2002
Location: Austin TX

Senior Member

Hi yes, the tremulus LFO operates between 3-6V approximately. So the center of the wave is at about 4.5V (DC offset). To adjust the offset the best way is to run the LFO output through an opamp, and add or subtract a DC voltage. The circuit should be simple, but you'll need to understand opamp theory to do it right.

I may create a small PCB with a header for LFO input, and trim pots for adjusting offset, and the LFO output/input jacks would solder directly to the board. But I haven't designed it yet!

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