>
> 1) Regarding the long/short adsr option - determined by switching
> (SW2) "TSW" between ground or not. When TSW is grounded, are the ADSR
> times long or short?? I guess I could figure this out after I wire it
> up, however I'm debating on whether I want to use the extra hole on
> the panel for a adsr time switch or a manual gate...
The larger the cap, the larger the time. When caps are wired in
parallel, their values are added together. So, grounding that switch is
for "long" time.
>
> 2) I purchased the CGS04 DC Mixers so I could invert the output of
> the ADSR. How do I implement this? I understand that the TL072 is a
> dual opamp, and in the CGS04 the first opamp in the TL072 inverts the
> input signal (makes it negative) and then inverts the signal again
> (making it positive) with the second opamp. How can I safely skip one
> of the opamps so I can use the inverted signal on my panel? Or, do I
> use both opamps? I see three possible methods, however I don't know
> which one is right.
> 2.1) Can I take the inputs and take them directly (after their 100k
> resistors) to pin 6 of the TL072 and leave the rest of the circuit as
> is?
> 2.2) Can I skip the 100k resistor between the two opamps, taking the
> signal from pin 1 to the 1k resistor, and then take the signal from
> the resistor directly to the output (skipping the 100k resistor in the
> ?feedback loop? of opamp2)?
> 2.3) Use both opamps as the circuit diagram shows, however use the
> additional circuitry in Red. << I have absolutely no idea what this
> stuff is doing. Also, as I won't be using pots on this circuit, I
> don't know what I'll be connecting to points B & C.......
A Bridechamber Inverter PCB would work best : )
It was pretty much designed for this application. And Ken designed it!
>
> Here are the URL's for reference
> MFOS ADSR:
> http://www.musicfromouterspace.com/analogsynth/ADSR001/ADSR001.html
>
> CGS04 DC Mixer:
> http://www.cgs.synth.net/modules/cgs04_mix.html
>
> Any help is greatly appreciated,
> Jim
>
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