[sdiy] Aztec MkII Schematic

[Michael Ruberto]

Tim,
>
>Nice!! It looks like you're getting a lot of mileage from those 3916s.
>One thought about the offset added by the Slope control - would it be
>possible to use a dual pot, and have the second element add a DC
>voltage to the output summing amp? This voltage would be opposite
>polarity from the offset, and could cancel it out (or at least help
>minimize the effect).

HEHEhe this how the AGC add-on works. It uses a mirrored version of the 
"Width" CV with an offset voltage to control the "Height". The effect on the 
output is to maintain the output to around 6 volts for most of the sweep. Of 
course it tapers off once the sweep gets down to 6 bits or so.

The problem I will encounter using this same method to control the DC offset 
produced by the Slope control is that the level of the offset also varies 
with Width. Lets say I turn Slope to max Log with Width at max and get an 
offset of 5 volts. Now if I change the Width to a lower value that offset is 
also reduced. So then the DC voltage applied to the summing amp will need to 
be some strange product of both Slope and Width.
I don't think my math skills are up to that challenge.

>
>Anyway, don't keep us waiting and post some audio samples as soon as you 
>can!
>

This is in the works. I'm still trying to decide on whether I should unrack 
my S6000 and take it to the workshop or buy a REALLY LONG guitar cord ;-)

M. A. Ruberto

>
>Tim (If you blow up the circuit, will you be sacrificing an Aztec?)

Most likely I will destroy their place of sacrifice and make them resort to 
using the parking lot of the local WalMart.



>Servo
>--
>"Imagination is more important than knowledge." - Albert Einstein

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