[sdiy] ring mod/asm-1 lfo

[Scott Gravenhorst]

The simplest way would be to pass it through a diode.  Doing so would give and
on/off/on/off effect


"gregory zifcak" <zifcak at hotmail.com> wrote:
>ah, that makes sense. is there some way i can remove the negative portion of 
>the square?
>thanks,
>greg
>
>>From: Scott Gravenhorst <music.maker at gte.net>
>>Reply-To: music.maker at gte.net
>>To: synth-diy at dropmix.xs4all.nl
>>Subject: Re: [sdiy] ring mod/asm-1 lfo
>>Date: Sun, 24 Oct 2004 19:33:44 -0700
>>
>>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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>>-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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>
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---------------------------------------------------------
- Where merit is not rewarded, excellence fades.
- Hydrogen is pointless without solar.
- What good are laws that only lawyers understand?
- The media's credibility should always be questioned.
- The only good terrorist is a dead terrorist.
- Governments do nothing well, save collect taxes.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- Autodidactic Master of Arcane and Hidden Knowledge.