[sdiy] ring mod/asm-1 lfo

[Scott Gravenhorst]

My guess is that it's a 4 quadrant multiplier.  You're square wave is probably
AC, meaning it spends some time above zero and then some time below zero
(absolute value of the voltage would be the same).  So what's happening is the
ringmod is merely inverting your signal when the LFO is negative and not
inverting when the LFO is positive.  You really should hear only the clicks as
the square wave changes states.  To get a tremelo effect, you'd want the
negative half cycle to be, say, 0 volts instead of negative something.  It
sounds to me like it's working perfectly.


"gregory zifcak" <zifcak at hotmail.com> wrote:
>hi,
>i am building the roman sowa ring mod with asm-1 lfo (with a .1 uF cap) as 
>the oscillator and it works great! except that in both ac and dc modes the 
>triangle does tremolo, and the square doesn't. the square is definitely 
>working to my ears, but when it gets sub audio all i hear is the clicking of 
>the edges and the other source comes through fine. my first suspects were 
>that i did the dc filter portion wrong, but the tri wave works sub audio. 
>any ideas?
>
>thanks in advance,
>greg
>
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