Headphone Output to CV input

The Moog Forum Little Phatty & Slim Phatty Forum
1

Will I damage My Sub 37, if I use My audio interface’s Headphone output to send a soft synth Oscillator signal to the Sub 37’s Pitch CV input ?
I did try it out briefly, and it allows Me to do some cool FM, But I was not sure if it was alright to do that safely.
I have read that You need a DC coupled audio interface to use it for CV, But I dont have one.
will it be safe to use the headphone output to send a CV signal to the Sub 37 ? Should I completely avoid doing this ?
How many volts is a headphone output ( variable upto 1.8 - 2 volts max) … Does this mean it will not damage the synth upto 5 Volts (a CV signal ) ?

2

you can make a DC coupled cable with a simple circuit, and send actual CV out of any audio interface. There is a diagram on the expert sleepers website.

http://www.expert-sleepers.co.uk/index.php

3

here is the direct link :

http://www.expert-sleepers.co.uk/siwaacencoder.html


EDIT : check the message below

4

This expert sleepers cable has nothing to do with “dc-coupled”.
“DC-coupled” means, that the connection is able to carry any signal, DC or AC. On the other side, “AC-coupled” means, that any DC-amount of a signal is blocked (by a serial capacitor).
The expert sleepers cable rectifies the audiosignal to a DC Signal, which then can be used as a control voltage.

However, Nutrinoland will use the audiosignal for FM. So the signal must not be changed like with this rectifying cable. The use of Nutrinoland is absolutely correct. A slight improvement can be achived by using an AC-coupled cable (just a serial cap like 220nF in the hot line) which eleminates the (unwanted) DC portion of the audio signal, because this has the effect of sliding the pitch with a constant value.

Don’t worry about the level, this is, as you mentioned, much below the usual CV.

cheers,
Bernard

5

thanks for your input. that’s a great clarification

6

I misunderstood the op’s question. Sorry